Contents

PREFACE xxv

ACKNOWLEDGMENTS xxvii

MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS xxix

PART I: PLENARY SESSION I

OXIDE SUPERCONDUCTORS: A CHEMIST'S VIEW 3A.W. Sleight

NEUTRON DIFFRACTION STUDIES OF HIGH Tc SUPERCONDUCTORS 9D.G. Hinks, B. Dabrowski, K. Zhang, C.U. Segre,J, D, Jorgensen, L, Soderholm, and M.A. Beno

Ba2YCu3O7_δ: EFFECT OF OXYGEN STOICHIOMETRY 19R. J. Cava, B. Batlogg, A.P- Ramirez, D. Werder,C.H. Chen, E.A. Rietman, and S.M. Zahurak

THEORIES OF HIGH Tc SUPERCONDUCTORS 27John Bardeen

PART II: PLENARY SESSION II

MATERIALS ASPECTS OF OXIDE SUPERCONDUCTORS―EFFECT OFAMBIENT WATER ON SUPERCONDUCTIVITY 33

K. Kitazawa, K. Kishio, T. Hasegawa, A. Ohtomo,S. Yaegashi, S. Kanbe, K. Park, K. Kuwahara,and K. Fueki

OXYGEN VACANCY ORDERING IN BaYCu3O7_x, 0<x<1, BYELECTRON DIFFRACTION STUDIES 41

M.A. Alario-Franco, J.J- Capponi, C. Chain out,J. Chenavas, and M. Marezio

THE PREPARATION OF BULK AND THICK FILMS OF YBa2Cu3O7-yUSING A SOLUTION TECHNIQUE 49

P. Barboux, J.M. Tarascon, B.G. Bagley, L.H. Greene,G.W. Hull, B.W. Meagher, and C.B. Eom

FERMI SURFACE IN La2CuO4-,δ DETERMINE BY POSITRON 2D-ACAR 57Shoichiro Tanigawa, Yoji Mizuhara, Yoshikazu Hidaka,Migaku Oda, Minoru Suzuki, and Toshiaki Murakami

HIGH-TC SUPERCONDUCTING FILMS OF Y-Ba-Cu OXIDE PREPAREDBY A LOW PRESSURE PLASMA SPRAYING 63

K. Tachikawa, I. Watanabe, and S. Kosuge

PART III: INVITED SESSION I

MAGNETISM, SPECIFIC HEAT, AND SURFACE TOPOGRAPHY OFOXIDE SUPERCONDUCTORS 71

H. Jenny, H. Bretscher, T. Frey, D. Anselmetti,H. Heinzelmann, R. Wiesendanger, G. Leemann,B. Walz, D. Sackinger, and H.-J. Guntherodt

THE EFFECTS OF OXYGEN STOICHIOMETRY AND OXYGEN ORDERINGON SUPERCONDUCTIVITY IN Y1Ba2Cu3O9-x 77

R. Beyers, E.M. Engler, P.M. Grant, S.S.P. Parkin,G. Lim, M.L. Ramirez, K.P. Roche, J.E. Vazquez,V.Y. Lee, R.D. Jacowitz, B.T. Ahn, T.M. Giir, andR.A. Huggins

HIGH-RESOLUTION X-RAY MICROSTRUCTURAL STUDY OF SINGLECRYSTALS OF YBa2Cu3O7-y 83

Hoydoo You, J.D, Axe, X.B. Kan, S.C. Moss, J.Z. Liu,and D.J. Lam

EFFECT OF OXYGEN PRESSURE ON THE PHASE TRANSFORMATION INTHE Y-Ba-Cu-0 AND RELATED SUPERCONDUCTING OXIDES 89

Y. Kubo, Y. Nakabayashi, J. Tabuchi, T. Yoshitake,T. Manako, A- Ochi, K. Utsumi, H. Igarashi, andM. Yonezawa

THEORETICAL STUDIES OF COPPER OXIDE CLUSTERS:PREDICTION OF AN ELECTRONICALLY DRIVEN PHASE SEPARATIONIN YBa2Cu3Ox 95

L.A. Curtiss, T.O. Brun, and D.M. Gruen

HIGH TEMPERATURE SUPERCONDUCTORS IN THE Lai+xBa2-xCu3OySYSTEM 101

E.M. McCarron III, C.C. Torardi, J.P. Attfield,K.J. Morrissey, A.W. Sleight, D.E. Cox, R.K. Bordia,W.E. Farneth, R.B. Flippen, M.A. Subramanian,E. Lopdrup, and S.J. Poon

OXYGEN ORDER, STOICHIOMETRY AND MAGNETIC BEHAVIOR OFYBa2(Cui_xFex)307+6 107

C.W. Kimball, J.L. Matykiewicz, John Giapintzakis,Hsun Lee, B.D. Dunlap, M. Slaski, F.Y. Fradin,C. Segre, and J.D. Jorgensen

IN-SITU PRODUCTION OF SUPERCONDUCTING YBa2Cu3O7_y THIN

FILMS BY HIGH PRESSURE REACTIVE EVAPORATION WITH RAPIDTHERMAL ANNEALING 113

D.K. Lathrop, S.E. Russek, and R.A. Buhrman

HIGH CRITICAL-CURRENT DENSITY Ba2YCu3O7 THIN FILMSPRODUCED BY COEVAPORATION OF Y, Cu, AND BaF2 119

P.M. Mankiewich, R.E. Howard, W.J. Skocpol,A.H. Dayem, A. Ourmazd, M.G. Young, and E. Good

RADIATION DAMAGE IN THIN FILMS OF HIGH TcSUPERCONDUCTORS 127

G.J. Clark, F.K. Legoues, A.D. Marwick,R.B. Laibowitz, and R.H. Koch

PART IV: INVITED SESSION II

OPTICAL PROPERTIES OF DOPANT INDUCED STATES INLa2-xSrxCu04-6 COMPOUNDS 135

S. Etemad, D.E. Aspnes, P. Barboux, G.W. Hull,M.K. Kelly, J.M. Tarascon, R. Thompson,S.L. Herr, K. Kamaras, CD. Porter, andD.B. Tanner

THEn-p TRANSITION IN YBa2Cu3Og.5+x 141G.M. Choi, H.L. Tuller, and*M.-J. Tsai

SINGLE-CRYSTAL STRUCTURAL STUDY OF La2CUQ,9 5Li0.054 147J.M. Delgado, J.S. Speck, R.K. McMullan,G. Diaz de Delgado, and B.J. Wuensch

OBSERVATION OF HEXAGONALLY ORDERED FLUX QUANTA INYBa2Cu307 153

P.L- Gammel, D.J. Bi shop, G.J. Dolan, J.R. Kwo,C.A. Murray, L.F. Schneemeyer, and J.V. Waszczak

PREPARATION OF HIGH Tc YBa2CU3O7_x POWDERS FROM NITRATEAND OXALATE PRECURSORS 159

M.H. Kayser, B. Borglum, G. Antony, S.G. Shyu,and R.C. Buchanan

HIGH~TC SUPERCONDUCTING OXIDE FILMS PRODUCED FROMSOLUTION PRECURSORS 165

Emanuel I. Cooper, Margaret A. Frisch,Edward A. Giess, Arunava Gupta, Brian W. Hussey,

Eugene J.M. 01Sullivan, Stanley I. Raider, andGerald J. Scilla

PHASE EQUILIBRIA STUDIES NEAR THE SUPERCONDUCTING

YBa2CU3Ox COMPOSITION BY A SOLID-STATE IONIC TECHNIQUE 171Byung Tae Ahn, Turgut M. Giir, Robert A, Huggins,Robert Beyers, and Edward M. Engler

X-RAY ABSORPTION STUDIES OF La2-xSrxCuO4 A^0Y1_xPrxBa2Cu307_δ 177

E.E. Alp, G.K. Shenoy, L. Soderholm, G.L. Goodman,D.G. Hinks, B.W. Veal, P.A. Montano, and D.E. Ellis

ANISOTROPIC NORMAL STATE TRANSPORT PROPERTIES OF OXIDE

SUPERCONDUCTORS PREDICTED FROM LAPW BAND STRUCTURES 183Philip B. Allen, Warren E. Pickett, andHenry Krakauer

PART V: INVITED SESSION III

DEVELOPMENTS OF TAPE AND WIRE FABRICATION PROCESSES FOR

HIGH TcBa2YCU3O7_y OXIDE SUPERCONDUCTORS 191K. Togano, H. Kumakura, and H. Shimizu

THE DEPOSITION, FABRICATION AND CHARACTERISTICS OFHIGH CRITICAL TEMPERATURE DEVICES 197

G.W. Morris, M.G. Blamire, R.E. Somekh,E.J. Tomlinson, and J.E. Evetts

ALIGNED SINTERED COMPACTS OF RBa2Cu3O7_x (R=Dy, Er,Eu, Gd, Ho, Y) 203

R.H. Arendt, A.R. Gaddipati, M.F. Garbauskas,E.L. Hall, H.R. Hart, Jr., K.W. Lay, J.D.Livingston, F.E. Luborsky, and L.L. Schilling

DEFECT STRUCTURES IN YBa2Cu3O7_x PRODUCED BY ELECTRONIRRADIATION 209

M.A. Kirk, M.C. Baker, J.Z. Liu, D. J. Lam, andH.W. Weber

TRANSMISSION ELECTRON MICROSCOPE STUDIES ON MINORPHASES AND IMPERFECTIONS IN YBa2Cu3Ox COMPOUNDS 215

Shozo Ikeda, Kazuhiro Kimura, Akiyuki Matsushita,Haruyoshi Aoki, Takeshi Hatano, Takehiko Matsumoto,and Keiichi Ogawa

FIELD DEPENDENCE OF MEISSNER EFFECT IN A SINGLE CRYSTALOF YBa2CU3Ox IN THE ULTRA-LOW MAGNETIC FIELD REGIME 221

L. Krusin-Elbaum, A.P. Malozemoff, and Y. Yeshurun

FAR-INFRARED PROPERTIES OF ab PLANE ORIENTEDYBa2Cu3O7_ 6 227

D.A. Bonn, A.H. O'Reilly, J.E. Greedan, C.V. Stager,T. Timusk, K- Kamaras, and D.B. Tanner

ON THE TWIN FORMATION IN ORTHORHOMBIC Y1Ba2CU3O7_y 233D. Rios-Jara, C. Varea, A. Robledo, A. Huanosta,J.M. Dominguez, J. Omaha, T. Akachi, and R. Escudero

PART VI; PREPARATION OF BULK MATERIALS I

Ba2YCu306B9 POWDER PREPARATION BY SOL-GEL EMULSIONTECHNIQUES 241

M.J. Cima, R- Chiu, and W.E. Rhine

SINTERING AND MICROSTRUCTURE - PROPERTY RELATIONS FORYBa2Cu3Ox 245

R.K. Bordia, H.S. Horowitz, M.A. Subramanian,J.B. Michel, E.M. McCarron, III, C.C. Torardi,J.D. Bolt, U. Chowdhry, E. Lopdrup, and S.J. Poon

SYNTHESIS AND CHARACTERIZATION OF Ba2Cu3PrO7_x 249J. Amador, C. Cascales, and I. Rasines

APPLICATION OF GEL TECHNOLOGY IN PREPARATION OF HIGH-TCPEROVSKITE SUPERCONDUCTORS 253

R.S. Liu, G.C. Lin, H.M. Sung, Y.C. Chen, andO.C.C. Lin

YBa2Cu3O7_6 SUPERCONDUCTORS PRODUCED BY HOT-PRESSING OFFREEZE-DRIED, CARBONATE- AND OXALATE-COPRECIPITATEDPOWDERS 257

C.T. Wang, L.S. Lin, J.H. Lin, J.Y. Su, S.J, Yang,and S.E. Hsu

THE FORMATION OF Y-Ba-Cu-0 PHASES DURING SOLID STATEREACTION 261

T.S- Chin, T.W. Huang, W.T. Lin, N.C. Wu,Y.H. Chou, T.C. Wu, P.T. Wu, and H.H. Yen

EFFECT OF THERMAL PROCESSING ON THE MICROSTRUCTURES ANDSUPERCONDUCTING PROPERTIES OF YBa2Cu3Oy 265

K. Gotoh, H. Enomoto, K. Iida, Y. Takano, N. Mori,and H. Ozaki

PROCESSING-PROPERTY RELATIONS IN YBa2CU3O6+x SUPER-CONDUCTORS 269

A. Safari, J.B. Wachtman, Jr., V. Parkhe,R. Caracciolo, D. Jeter, A.S. Rao, H.G.K. Sundar,N. Jisrawi, and W.L. McLean

LASER INDUCED DEPOSITION OF YBa2Cu3O7_x THIN FILMS 273H.S. Kwok, P. Mattocks, D.T. Shaw, L. Shi,X.W. Wang, S. Witanachchi, Q.Y. Ying, J.P. Zheng,and P. Bush

TOP SEEDED SOLUTION GROWTH OF LANTHANUM COPPER OXIDE 279P.J, Picone, H.P. Jenssen, D.R, Gabbe, andH.L. Tuller

EFFECT OF OXYGEN ANNEALING ON LOW-RESISTIVITY CONTACTSFOR HIGH-TC SUPERCONDUCTORS 283

J.W. Ekin, A.J. Panson, and B.A. Blankenship

PART VII: FILMS, WIRES, ETC. I

HIGH Tc SUPERCONDUCTING FILMS FROM METALLO-ORGANICPRECURSORS 289

W.W. Davison, S.G. Shyu, and R.C. Buchanan

FABRICATION AND SUPERCONDUCTING PROPERTIES OF HIGH TcOXIDE WIRE 293

N. Sadakata, Y, Ikeno, M. Nakagawa, K. Gotoh,and O. Kohno

A METAL-ALLOY PROCESS FOR THE FORMATION OF OXIDESUPERCONDUCTING FILMS: ADVANTAGES, PROBLEMSSUBSTRATE INTERACTIONS, BUFFER LAYERS 297

M. Gurvitch and A.T. Fiory

INTERFACE EFFECTS OF LASER ABLATED AND SPUTTERED HIGHTc SUPERCONDUCTING THIN FILMS 303

B. Dam, T.S. Bailer, G.N.A. van Veen,H.A.M. van Hal, J.W.C. De Vries, andG.M. Stollman

SPIN-ON THIN FILMS OF YBa2CU3O7_y AND La2-xSrxCuO4-yFROM CITRATE-POLYMER PRECURSORS 307

Yet-Ming Chiang, Sharon L. Furcone, Jeri Ann S.Ikeda, and David A. Rudman

FABRICATION OF HIGH Tc SUPERCONDUCTING FILMS WITHDIFFUSION BARRIERS 311

C.L. Chien, Gang Xiao, M.Z. Cieplak, A. Bakhshai,A. Gavrin, F.H. Streitz, and J. Childress

FORMATION OF THIN FILM YBaCuO SUPERCONDUCTORS FROMCu/BaO/Y2O3 LAYER STRUCTURES 315

Chin-An Chang, C.C. Tsuei, C.C Chi,M.R. Scheuermann, D.S. Yee, and J.P. Berosh

PREPARATION OF Y-Ba-Cu-0 SUPERCONDUCTING FILMS BYMODIFIED DC SPUTTERING PROCESS 319

R.J. Lin, Y.C. Chen, J.H. Kung, and P.T. Wu

PREPARATION OF THIN FILM YBa2CU3Og+x CERAMIC SUPER-CONDUCTORS BY THE SOL-GEL PROCESS 323

S. Kramer, K. Wu, and G. Kordas

FORMATION AND PROCESSING OF HIGH Tc SUPERCONDUCTORFILMS WITH PULSED EXCIMER LASER 327

Tomoji Kawai, Masaki Kanai, and Maki Kawai

PROPERTIES OF Y-Ba-Cu-0 FILM FORMED BY THE SPRAYPYROLYSIS METHOD 331

Maki Kawai, Tomoj i Kawai, Hiromi Masuhira, andMakoto Takahasi

THIN FILMS OF Y-Ba-Cu-0 BY RF SPUTTERING 335Paul H. Ballentine, A.M. Kadin, J. Argana, andR.C. Rath

EPITAXIAL FILMS OF HIGH Tc OXIDE SUPERCONDUCTORSY;LBa2Cu3O7 GROWN ON SrTiO3 BY MOLECULAR BEAM EPITAXY 339

J. Kwo, T.C. Hsieh, M. Hong, R.M. Fleming,S.H. Liou, and B.A. Davidson

HIGH-TEMPERATURE SUPERCONDUCTING Y-Ba-Cu-0 THIN FILMBY USING IONIZED CLUSTER BEAM METHOD 343

K. Yamanishi, S. Yasunaga, K. Imada, K. Sato,and Y. Hashimoto

PART VIII: PHYSICAL PROPERTIES AND THEORY I

PHOTOEMISSION STUDY OF THE ELECTRONIC STRUCTURE OF COPPEROXIDE SUPERCONDUCTORS 349

Z.-X. Shen, J.W. Allen, J.J. Yeh, J.-S. Kang,W. Ellis, W.E. Spicer, I. Lindau, J.Z. Sun,T.H. Geballe, M.B. Maple, Y.D. Dalichaouch, andM.S. Torikachvili

ELECTRONIC STRUCTURE AND ANTIFERROMAGNETISM IN La2CuO4 353P.A. Sterne, C.S. Wang, G.M. Stocks, andW.M. Temmerman

NOISE POWER SPECTRUM OF COPPER OXIDE SUPERCONDUCTORS INTHE NORMAL STATE 357

Joseph A. Testa, Yi Song, Xiao-Dong Chen,John P. Golben, Robert D. McMichael, Sung-Ik Lee,Bruce R. Patton, and James R. Gaines

MAGNETIC INVESTIGATIONS OF SUPERCONDUCTIVE, POLYCRYSTAL-LINE (RE)1Ba2Cu3O7_x COMPOUNDS (RE = Y, Gd, Ho, Dy) 361

J.R. Thompson, L.A. Boatner, J. Brynestad,D.K. Christen, Y.C. Kim, B.C. Sales, andS.T. Sekula

EFFECT OF TEMPERATURE CYCLES ON THE CRITICAL CURRENTDENSITY OF YBa2Cu3O7_δ 365

T.H. Tiefel, S. Jin, R.C. Sherwood, R.A. Fastnacht,S. Nakahara, G. Fisanick, and T. Boone

MAGNETIZATION OF A SUPERCONDUCTING GLASS 371M. Tuominen, A.M. Goldman, and M. L. Mecartney

REENTRANT SOFTENING IN COPPER-OXIDE SUPERCONDUCTORS 375C.E. Violet, T. Datta, H.M. Ledbetter, C. Almasan,and J. Estrada

63,65Cu NMR amd NQR IN YBa2Cu3O7_δ 379W.W. Warren, Jr., R.E. Walstedt, R.F. Bell,G.F. Brennert, R.J. Cava, G.P. Espinosa,J.P. Remeika, and E.A. Rietman

CHANGES IN MICROWAVE ABSORBTION OF NEW HIGH Tc SUPER-CONDUCTORS WITH SMALL MAGNETIC FIELDS 3 83

K. Khachaturyan, E.R. Weber, P. Tejedor, A. Stacy,and A. Portis

PENETRATION DEPTH MEASUREMENTS OF YBa2Cu3O7_δat 4 MHz 387H. Wiesmann, R. R. Corderman, A.R. Moodenbaugh,M.W. Ruckman, and Myron Strongin

RADIATION DAMAGE IN YBa2Cu3O7 BY FAST NEUTRONS 391J.O. Willis, J.R. Cost, R.D. Brown, J.D.Thompson, and D.E. Peterson

SYNTHESIS STUDY OF SUPERCONDUCTING YBa2CU3O7_x POWDERSFROM METAL-ALKOXIDES 395

K. Wu, S. Kramer, and G. Kordas

SUPERCONDUCTING PROPERTIES OF ORTHORHOMBICYBa2(Cu1_xZnx)3O7 AND TETRAGONAL YBa2(Cui_xGax)3O7 399

Gang Xiao, M.Z. Cieplak, A. Gavrin, F.H. Streitz,A. Bakhshai, and C.L. Chien

ELECTRONIC STRUCTURE OF FLUORINE-SUBSTITUTED YBa2Cu3O7SUPERCONDUCTOR 403

W.Y. Ching, Yongnian Xu, and K.W. Wong

CRITICAL CURRENT DENSITY ENHANCEMENT AND MOISTUREDESTRUCTION STUDIES OF THE COMPOUND SUPERCONDUCTORY-Ba-Cu-Ag-0 407

Y.D. Yao, A. Krol, Y.H. Kao, C. Walters,S. Spagna, J. Althoff, S. Woronick, L.Y. Jang,and F. Xu

SPINODAL DECOMPOSITION AND HIGH-TC SUPERCONDUCTIVITY 411Robert S, Markiewicz

RAMAN SCATTERING STUDIES ON SUPERCONDUCTING YBa2Cu3O7_x,SEMICONDUCTING YBa2CU3Oδ+x, AND POSSIBLE IMPURITYPHASES 415

A. Mascarenhas, H. Katayama-Yoshida, S. Geller,J.I. Pankove, and S.K. Deb

CRITICAL CURRENT ANISOTROPY IN SINTERED SUPERCONDUCTINGYBa2Cu3O7 419

B.A. Glowacki and J.E. Evetts

MEASUREMENT OF THE MAGNETIC FORM FACTOR OF Cu INANTIFERROMAGNETIC La2CuO4 423

S. Mitsuda, T. Freltoft, G. Shirane, J.P. Remeika,and A.S. Cooper

SUPERCONDUCTIVITY OF La(2-x)BaxCuO4 427A.R. Moodenbaugh, Y. Xu,and M. Suenaga

FLUX TRAPPED STATE VERSUS GLASSY STATE IN SUPERCON-DUCTING BaErCuO AND BaYCuTiO 431

Sang Boo Nam

FAR INFRARED MEASUREMENTS ON SINGLE CRYSTALS, FILMSAND BULK SINTERED HIGH TEMPERATURE SUPERCONDUCTORS 435

T.W. Noh, P.E. Sulewski, S.G. Kaplan, A.J. Sievers,D.K. Lathrop, and R.A. Buhrman

EFFECT OF OXYGEN ANNEALING ON THE MAGNON-PAIR RAMANSCATTERING IN La2Cu04_y 439

I. Ohana, Y.C. Liu, M.S. Dresselhaus,G. Dresselhaus, A.J. Strauss, H. J, Zeiger,P.J. Picone, H.P. Jenssen, and D.R. Gabbe

ANISOTROPIC BEHAVIOR OF A HIGH Tc SUPERCONDUCTOR 443F.A. Otter, J.I. Budnick, B.R. Weinberger,L. Lynds, D.-P. Yang, S.F. Galasso,M. Filipkowski, W.A. Hines, and D.M, Potrepka

TIGHT-BINDING STUDY OF THE ELECTRONIC STRUCTURE OF THEHIGH TEMPERATURE SUPERCONDUCTOR La2Cu04 447

D,A. Papaconstantopoulos, M.J. Deweert, andW.E. Pickett

DERIVATIVE ANALYSIS OF THE HIGH TEMPERATURE SUPER-CONDUCTING TRANSITION 451

Carmen Almasan, J. Estrada, C.P. Poole, Jr.,T. Datta, H.A. Farach, D.U. Gubser, S.A. Wolf,and L.E. Toth

LOW-FIELD MICROWAVE ABSORPTION IN HIGH-TC SUPERCON-DUCTING OXIDES 455

B.L. Ramakrishna, E.W. Ong, and Z. Iqbal

SPECIFIC HEAT LINEAR TERM IN YBa2Cu3O7_x AND ASURVEY OF RELATED COMPOUNDS 459

A.P. Ramirez, R.J. Cava, G.P. Espinosa,J.P. Remeika, B. Batlogg, S. Zahurak, andE.A. Rietman

THEORETICAL STUDIES OF OXYGEN VACANCIES INYBa2Cu3O7-y 463

Brent A. Richert and Roland E. Allen

COPPER VALENCE VIA SMALL POLARON ANALYSIS IN SINTER-FORGED YBa2Cu3O7_y AT 700OC 467

Deepak Ahuja, S.E. Dorris, M.-Y. Su,Q. Robinson, D.L. Johnson, and T.O. Mason

ELECTRON SCATTERING IN SUPERCONDUCTING OXIDES 471J. Ruvalds and Y. Ishii

CALORIMETRIC STUDIES OF HIGH TEMPERATURE OXIDESUPERCONDUCTORS 47 5

Yasutoshi Saito, Tetsuro Nakamura, andTooru Atake

BULK SUPERCONDUCTIVITY IN La2CuO4479

J.E. Schirber, E.L. Venturini, B, Morosin,J.F. Kwak, D.S. Ginley, and R.J. Baughman

CARRIER CONCENTRATION AND HIGH Tc SUPERCONDUCTIVITY 483N. Karpe, I. Szymczak, D.-X. Chen, A. Sanchez,J. Nogues, and K.V. Rao

SHORT RANGE ORDER STRUCTURE AROUND OXYGEN ATOMS IN THESUPERCONDUCTOR Y-Ba-Cu-0 487

S,C. Woronick, W. Ng, A. Krol, B.X, Yang, Y.H. Kao,R.L. Meng, P.H. Hor, and C.W. Chu

ELECTRON IRRADIATION OF YBa2CU3O7 AT LOW TEMPERATURES 491B. Stritzker, W. Zander, F. Dworschak, U. Poppe,and K. Fischer

PRESSURE DEPENDENCE OF THE TETRAGONAL-ORTHORHOMBIC

TRANSITION IN Lax.88SrQ.12CUO4-5: A SINGLE CRYSTALX-RAY STUDY " 497

R. Moret and G. Collin

PART IX: SUBSTITUTION, STRUCTURE, ETC- I

SUPERCONDUCTING PROPERTIES OF YBa2CU3O7_6DOPED WITHVARIOUS METALS AND OXIDES 503

R.C. Sherwood, S. Jin, T.H. Tiefel, R.B. Van Dover,R.A. Fastnacht, M.F. Yan, and W.W. Rhodes

ION CHANNELING STUDIES OF CRYSTALLINITY, AMORPHIZATION,AND THERMAL ANNEALING IN SINGLE-CRYSTAL YBa2Cu30x 507

N.G. Stoffel, W.A. Bonner, P.A. Morris, andB.J. Wilkens

GRAIN BOUNDARIES, PLANAR DEFECTS AND SUPERCONDUCTINGPROPERTIES OF YBa2Cu3O7 511

J. Tafto, M. Suenaga, T. Wang, R.L. Sabatini,A.R. Moodenbaugh, and S. Levine

OXYGEN STOICHIOMETRY IN La-Ba-Cu-0 PEROVSKITES 515S.A. Sunshine, L.F. Schneemeyer, D.W. Murphy,and J.V. Wasczcak

ON THE EXISTENCE OF (02)2- IN YBa2Cu3-yMyO7+x, M=CoAND Fe 519

Y.K. Tao, J.S. Swinnea, A. Manthiram, J.S. Kim,J.B. Goodenough, and H. Steinfink

3d-METAL DOPING (Fe,Co,Ni,Zn) OF THE HIGH Tc PEROVSKITEYBa2Cu3O7_y 523

J.M, Tarascon, P. Barboux, L.H. Greene, G.W. Hull,and B.G, Bagley

OXYGEN ABSORPTION AND STRUCTURAL TRANSITION IN A MODELYBa2Cu3O7_y 527

C. Varea and A. Robledo

ION-BEAM-INDUCED DESTRUCTION OF SUPERCONDUCTING PHASECOHERENCE IN YBa2Cu3O7_δ 531

Alice E. White, K.T. Short, D.C. Jacobson,J.M. Poate, R.C. Dynes, P.M. Mankiewich,W.J. Skocpol, R.E. Howard, M. Anzlowar,K.W. Baldwin, A.F.J. Levi, J.R. Kwo, T. Hsieh,and M- Hong

VACANCY ORDERING IN THE BASAL PLANE OF YBa2Cu302 535L.T. Wille, A. Berera, D. De Fontaine, andS.C. Moss

IONIC MODELS FOR YBa2Cu3O7 539N.F. Wright, G.S. Painter, W.R. Busing, andW.H. Butler

SUPERCONDUCTIVITY IN PSEUDO-QUATERNARY SYSTEM 543P.C. Yao. C.I. Chiang, C.W. Hsieh, J.W. Chen,I.N. Lin. S.J. Yang, and S.E. Hsu

SUPERCONDUCTIVITY IN THE FLUORINATED YBaCuO 549R.T. Young, S.R. Ovshinsky, B.S. Chao,G. Fournier, and D.A. Pawlik

SIMULATION AND PROCESSING OF HIGH RESOLUTION IMAGESOF DEFECTS AND INTERFACES IN SUPERCONDUCTINGYBa2Cu3O7 553

H.W. Zandbergen, R. Gronsky, K. Wang, andG. Thomas

SITE EXCHANGE IN HIGH TEMPERATURE SUPERCONDUCTORS 557D.J. Li, H. Shibahara, J.P. Zhang, and L.D. Marks

DETERMINATION OF THE OXYGEN CONTENT IN SAMPLES OFYBa2Cu3O7_x WITH VARIABLE OXYGEN CONTENT 561

F.C. Matacotta, G. Nobile, Gianna Serrini,M.D. Giardina, and A.E. Merlini

RAPID SOLIDIFICATION OF YBa2Cu3O7_x, EuBa2Cu3O7_x, ANDGdBa2Cu3O7_x 567

J. McKittrick, M.E. McHenry, P. Standley,C. Heremans, T.R.S. Prasanna, G. Kalonji, andR.C. O'Handley

THERMOCHEMISTRY AND HIGH TEMPERATURE THERMODYNAMIC

PROPERTIES OF RARE EARTH-ALKALINE EARTH-COPPER OXIDESUPERCONDUCTORS 571

Lester R. Morss, David C. Sonnenberger, andR.J. Thorn

ON THE DEFECT STRUCTURE OF GRAIN BOUNDARIES INBa2YCu307-x 575

S. Nakahara, G.J. Fisanick, M.F. Yan,R.B. van Dover, T. Boone, and R. Moore

ORDERING OF OXYGEN ATOMS IN YBa2CU3O6+x AND ITS EFFECTSON SUPERCONDUCTING PROPERTIES 579

Keikichi Nakamura, Takeshi Hatano, Shozo Ikeda,and Keiichi Ogawa

EPR SPECTROSCOPY ON Zn-SUBSTITUTED YBa2Cu3O7 583A.M. Ponte Goncalves, Chan-Soo Jee, D. Nichols,J.E. Crow, G.H. Myer, R.E. Salomon, andP. Schlottmann

EFFECT OF OXIDIZING ATMOSPHERE ON SUPERCONDUCTIVITY INRBa2Cu3_xMxOz 587

David A. Robinson, M. Abbot Maginnis,A. Morrobel-Sosa, Chester Alexander, Jr.C. Asavaroengchai, Robert M. Metzger, andDonald A. Stanley

OXYGEN STOICHIOMETRY AND SUPERCONDUCTIVITY INHo!Ba2Cu307_x 591

B.C. Sales, Y.C. Kim, J.R. Thompson, D.K. Christen,L.A. Boatner, and S.T. Sekula

GROWTH OF SEPARATED YBa2CU3O7_x CRYSTALS 595Hans J, Scheel and F. Licci

ELECTRON DIFFRACTION AND TEM STUDIES OF Y1Ba2CU3O7_x 601R. Perez, J.G. Perez-Ranfirez, M. Avalos, J. Reyes,L. Martinez, E. Orozco, E. Carrillo, A. Mendoza,J. Al bar ran, J. Fu en tes Maya, J.L. BoldU", andM. Jose-Yacama'n

X-RAY ABSORPTION AND RESISTIVITY STUDIES OF THE QUINARY-COMPOUND SUPERCONDUCTOR Y-Ba-Cu-O-S 605

S. Spagna, J. Althoff, Y.D. Yao, F. Xu, L.Y. Jang,A. Krol, and Y.H. Kao

LOCAL ENVIRONMENT AROUND BARIUM ATOMS IN THE SUPER-CONDUCTOR Y-Ba-Cu-0 609

A. Krol, F. Xu, L.Y. Jang, C.J. Sher, S. Spagna,J. Althoff, and Y.H. Kao

PART X: PREPARATION OF BULK MATERIALS II

ADVANTAGES OF BARIUM PEROXIDE IN THE POWDER SYNTHESIS OFPEROVSKITE SUPERCONDUCTORS 615

A.F. Hepp, J.R. Gaier, W.H. Philipp, J.D. Warner,R.G. Garlick, J.J. Pouch, and P.D. Hambourger

SYNTHESIS OF SUPERCONDUCTING OXIDES ANDOXIDE/METAL

COMPOSITES BY OXIDATION OF METALLIC PRECURSORS 619Gregory J. Yurek, John B. Vander Sande, andDavid A. Rudman

POSSIBILITY OF HIGH-TC COPPER FLUORIDE OXIDE SUPER-CONDUCTORS 623

P.T. Wu, R.S. Liu, H.M. Sung, and J.H. Kung

PROCESSING RELATIONSHIPS IN YBa2Cu3O7_x SUPERCONDUCTORS 627W.J. Weber, L.R. Pederson, G.D. Maupin, andE.J. LeBlanc

LASER PROCESSING AND CHARACTERIZATION OF HIGH-TCSUPERCONDUCTORS 631

W.H. Weber, E.M. Logothetis, R.E. Soltis,G.W. Graham, J.T. Chen, and L.E. Wenger

A HYDROXYCARBONATE ROUTE TO SUPERCONDUCTOR PRECURSORPOWDERS 635

J.A. Voigt, B.C. Bunker, D.H. Doughty, D.L, Lamppa,and K.M. Kimball

IMPROVED MAGNETIZATION FOR YBa2CU3O7_6 ANNEALED INOXYGEN ABOVE 1000°C 639

E.L. Venturini, D.S. Ginley, R.J. Baughman,B. Morosin, and J.F. Kwak

EFFECTS AND BEHAVIOR OF IMPLANTED FLUORINE IN HIGHTEMPERATURE SUPERCONDUCTORS 643

J.R. Tesmer, C. J. Maggiore, M. Nastasi,S-W. Cheong, and C-M. Dick

GROWTH OF YBa2Cu3O7_δ SINGLE CRYSTALS AND FILMS BY AFLUX AND A SPUTTERING METHODS 647

K. Takagi, M, Hirao, M. Hiratani, H. Kakibayashi,T. Aida, and S. Takayama

COPPER MIXED-VALENCY IN A NEW ALUMINUM-BARIUM-COPPEROXIDE 651

Paul D. VerNooy, Michael A. Dixon, andAngelica M. Stacy

ANNEALING EFFECTS ON PROPERTIES OF HIGH Tc YBa2Cu3O7_xCERAMICS 655

Shin-Guang Shyu, R.F. Louh, and R.C. Buchanan

SUPERCONDUCTIVITY IN Y-Ba-Cu-Ag-0 AND Y-Ba-Cu-Pt-0SYSTEMS 659

V.T. Kovachev, M.M. Gospodinov, E.S. Vlachov,V.A. Lovchinov, P.K. Svestarov, K. A. Nenkov,A.K. Stoianova, D.A. Dimitrov, B.M. Terziiska,S. Tinchev, M. Taslakov, T. Mydlarz, and M. Czyczek

SINTERING TIME AND TEMPERATURE FOR Ba2YCu3O7_x SUPER-CONDUCTORS 663

Jenifer A.T. Taylor, Prinya Sainamthip, andDavid F. Dockery

PART XI: FILMS, WIRES, ETC. II

BULK CERAMIC AND SCREEN PRINTED EuBa2Cu3O7_δ 669W.S. Fu, D.S. Ginley, M.A. Mitchell, E.L.Venturini, B. Morosin, J.F. Kwak, andR.J. Baughman

FREESTANDING FILMS OF YBa2Cu3O6.9 673D.S. Ginley, M.A. Mitchell, *W. Fu, J.F. Kwak,E.L. Venturini, and R.J. Baughman

PREPARATION OF SUPERCONDUCTING THIN FILMS OF HIGH Tc

CUPRATES BY A NOVEL SPIN-ON/PYROLYSIS TECHNIQUE 677C.E. Rice, R.B. van Dover, and G.J. Fisanick

ION BEAM SPUTTERING AND PROPERTIES OF SUPERCONDUCTINGYBaCuO THIN FILMS 681

D. Pavuna, W. Baer, H. Berger, V. Gasparov,M. Schmidt, F. Vasey, and F-K. Reinhart

EFFECT OF UNIAXIAL STRAIN ON THE SUPERCONDUCTINGTRANSITION TEMPERATURE IN THIN YBa2CU3O7 FILM 685

S.I. Park, M.R. Scheuermann, C.C. Chi, andC.C. Tsuei

ELECTRICAL, CHEMICAL, AND STRUCTURAL PROPERTIES OFPLASMA SPRAYED Y-Ba-Cu-OXIDE SUPERCONDUCTING COATINGS 689

R.A. Neiser, J. P. Kirkland, W.T. Elam, H. Herman,S. Rangaswamy, V.M. Letourneau, and M. Osofsky

SUPERCONDUCTING TAPE-SHAPED WIRE BY Y1Ba2Cu307_6 WITHJc * 2000 A/cm2 695

S. Matsuda, M. Okada, T. Morimoto, T. Matsumoto,and K. Aihara

DEPOSITION OF HIGH Tc SUPERCONDUCTOR THIN FILMS BYPULSED LASER ABLATION 699

D.N. Mashburn, D.B. Geohegan, D. Eres,D.H. Lowndes, L.A. Boatner, B.C. Sales,S.J. Pennycook, R.J. Culbertson, E. Sonder,and D.K. Christen

MICROSTRUCTURAL CHARACTERIZATION OF Ba2YCu3O7 FILMSPRODUCED BY CO-EVAPORATION 7 03

G.J. Fisanick, P. Mankiewich, W. Skocpol,R.E. Howard, A. Dayem, R.M. Fleming, A.E. White,S.H. Liou, and R. Moore

SUPERCONDUCTING THIN FILMS OF (RE)Ba2CU3(Ag)O7_xPREPARED BY PULSED LASER ABLATION 707

L. Lynds, B.R. Weinberger, G.G. Peterson, andH.A. Krasinski

HIGH Tc SUPERCONDUCTING Y-Ba-Cu-0 THICK FILM BY SCREENPRINTING 711

H.H. Yen, J.H. Kung, Y.C. Chen, and P.T. Wu

GRAIN BOUNDARIES IN YBa2Cu3O7_x 715L.A. Tietz, C.B. Carter, D.K. Lathrop, S.E. Russek,and R.A. Buhrman

THE MORPHOLOGY OF YBa2Cu3O7_x THIN FILMS GROWN ONCERAMIC SUBSTRATES 719

L.A. Tietz, B.C. De Cooman, C.B. Carter,D.K. Lathrop, S.E. Russek, and R.A. Buhrman

HIGH-TC SUPERCONDUCTING FILMS OF Y-Ba-Cu OXIDE PREPAREDBY A Co2 LASER BEAM EVAPORATION 723

K. Tachikawa, I. Watanabe, S. Kosuge, and M. Ono

PREPARATION OF Y-Ba-Cu OXIDE SUPERCONDUCTING COMPOSITETAPES BY A DIFFUSION PROCESS 727

K.Tachikawa, M.Sugimoto, N.Sadakata, andO.Kohno

A VERSATILE NEW METALLO-ORGANIC SPIN-ON PROCESS FORPREPARING SUPERCONDUCTING THIN FILMS 731

M.E. Gross, M. Hong, S.H. Liou, and P.K. Gallagher

LASER INDUCED DEPOSITION OF YBa2Cu3O7_x THIN FILMS 735H.S. Kwok, P. Mattocks, D.T. Shaw, L. Shi,X.W. Wang, S. Witanachchi, Q.Y. Ying, J.P. Zheng,and P. Bush

PART XII: PHYSICAL PROPERTIES AND THEORY II

EXTERNAL AND INTERNAL DIFFUSION OF OXYGEN IN SUPER-CONDUCTING YBa2Cu3O7 COMPOSITE CONDUCTORS 741

B.A. Glowacki and J.E. Evetts

THERMAL CONDUCTIVITY OF SINGLE-CRYSTAL AND SINTEREDRBa2Cu3O7 AT LOW TEMPERATURES 745

J.E. Graebner, L.F. Schneemeyer, R.J. Cava,J.V. Waszczak, and E.A. Rietman

CRYSTAL STRUCTURES AND SUPERCONDUCTIVITY IN THELa1-5_xBai.5+xCu307+y SYSTEM 749

J.E. Greedan, A.H. O'Reilly, C.V. Stager,F. Razavi, and W. Abriel

ELECTRICAL CONDUCTIVITY AND THERMOGRAVIMETRIC STUDIESOF THE HIGH-TC SUPERCONDUCTOR YBa2CU3Ox 753

Y.H. Han and D.W. Monroe

ORIENTATION DEPENDENT X-RAY ABSORPTION NEAR EDGESTRUCTURE IN YBa2Cu3O7 AND Lai.85Sr0.I5CUO4 757

S.M. Heald, J.M. Tranquada, A.R. Moodenbaugh,and Y. Xu

THERMAL CONDUCTIVITY OF SUBSTITUTED PEROVSKITE SUPER-CONDUCTORS 761

J. Heremans and D.T. Morelli

TUNNELING MEASUREMENTS OF DENSITY OF STATES IN SUPER-CONDUCTING YBa2Cu3Oy 765

K.Iida, K.Gotoh, H.Enomoto, Y.Takano, N.Mori,and H.Ozaki

EVIDENCE FOR d-ELECTRON LOCALIZATION INYBa2(Cui_xZnx)3O7 FOR 0<x<0.16 769

C. Jee, D. Nichols, J. Ciasullo, J.E. Crow,T. Mihalisin, G.N. Myer, M.V. Kuric, S.H. Bloom,and R.P. Guertin

CRITICAL CURRENT DENSITY OF THE YBa2Cu3O7_5 SUPERCON-DUCTOR AS AFFECTED BY MICROSTRUCTURAL CONTROL 773

S. Jin, R.C. Sherwood, T.H. Tiefel, R.B. van Dover,G.W. Kammlott, M.E. Davis, R.A. Fastnacht, S.Nakahara, M.F. Yan, and D.W. Johnson, Jr.

OPTICAL REFLECTANCE STUDIES ON YBa2CU3O7-x AND RELATEDCOMPOUNDS 777

K. Kamara's, M.G. Doss, S.L. Herr, J.S. Kim,CD. Porter, G.R. Stewart, D.B. Tanner. D.A.Bonn. J.E. Greedan, A.H. O.Reilly. CV. Stager,T.Timusk, B. Keszei, S. Pekker, Gy. Hutiray, andL. Mihaly

VIBRATIONAL RAMAN SCATTERING FROM HIGH Tc SINGLECRYSTALS 781

D.M. Krol, M. Stavola, L.F. Schneemeyer,J.V. Waszczak, and W. Weber

MECHANISM OF Jc ENHANCEMENT OF YBa2CU3O7-<5DUE TOAg-DOPING 785

J.H. Kung, H.H. Yen, Y.C. Chen, CM. Wang, andP.T. Wu

EVALUATION OF CRITICAL CURRENT DENSITY IN Ba2YiCu3O7-yCOMPOUND 7 89

Hiroaki Kumakura, Mitsuru Uehara. KazuhikoTakahashi, and Kazumasa Togano

L3 WHITE LINE SPLITTING OF COPPER IN THE ELECTRONENERGY LOSS SPECTRUM OF YBa2Cu3O7_x 793

Channing C Ahn, David S. Lee, and Konrad Samwer

ATOMISTIC LATTICE CALCULATIONS OF THE DEFECT PROPERTIESOF La2CuO4 RELATED TO HIGH Tc SUPERCONDUCTIVITY 797

N.L. Allan and W.C MacKrodt

MAGNETIC TRANSITIONS IN HIGH-TC SUPERCONDUCTORS 801R.A. Barrio, C. Wang, J. Tagiiena-Martinez,D. Rios-Jara, T. Akachi, and R. Escudero

TRANSPORT AND MEISSNER EFFECT STUDIES FORYBa2(Cui-xZnx)3O7 805

S.H. Bloom, M.V. Kuric, Y.S. Yao, R.P. Guertin,D. Nichols, C Jee, A. Kebede, J.R. Crow,T. Mihalisin, G.N. Myer. and P. Schlottmann

EFFECT OF WATER AND IRON ON SLOWLY AND RAPIDLY COOLEDY1Ba2Cu3Og+x SUPERCONDUCTORS: AN EPR/NMR STUDY 809

U.S. Brahme, G. Kordas, and R.J. Kirkpatrick

PHONONS IN YBa2Cu3O7_x TYPE MATERIALS 813Gerald Burns, F.H. Dacol, P. Freitas, W. Konig,and T.S. Plaskett

RAMAN AND INFRARED STUDIES OF Sr2Ti04 - AN ISOMORPHOF (La,Sr)2Cu04 817

Gerald Burns, F.H. Dacol, G. Kliche. W. Konig,and M.W. Shafer

GRAIN BOUNDARY SEGREGATION AND THERMAL HISTORY EFFECTS

ON PROPERTIES OF La1.85Sr0.15CuO4-y SUPERCONDUCTORS 821Yet-Ming Chiang,.Alexana Roshko, Brian D. Fabes,Dominic K. Leung, Jeri Ann S. Ikeda. David A.Rudman, Michael J. Parker, and John R. Martin

LATTICE DYNAMICS AND IONICITY IN THE HIGH-TEMPERATURESUPERCONDUCTORS 825

R.E. Cohen, W.E. Pickett, L.L. Boyer, andHenry Krakauer

MAGNETIC MEASUREMENTS ON YBa(2)Cu(3)O(x) CERAMIC HIGHTEMPERATURE SUPERCONDUCTORS 829

J, Cornells, A. Van Den Bosch, J. Vansummeren,H. Ooms, R. Gilissen, J. Cooymans, N. Maene,and F. Biermans

FAR INFRARED SPECTROSCOPY OF RBa2CU3Ox WITH VARIATIONSIN R AND x 833

M.K. Crawford, W.E. Farneth, R. Bordia, andE.M. McCarron III

ULTRA-LOW-FIELD SQUID MAGNETIC MEASUREMENTS ON HIGHTEMPERATURE CERAMIC YBaCuO SUPERCONDUCTORS 837

D.C. Cronemeyer, A.P. Malozemoff, andT.R. McGuire

NORMAL-STATE INFRARED ANISOTROPY OF POLYCRYSTALLINELa1-85Sro.i5Cu04-y 841

G.L. Doll, J. Steinbeck, M.S. Dresselhaus,G. Dresselhaus, A.J. Strauss, H.J. Zeiger,G. Phillips, and J. Waldman

FREQUENCY DEPENDENCE OF THE ABSORPTION COMPONENT OFTHE MAGNETIC SUSCEPTIBILITY IN SUPERCONDUCTINGY1Ba2Cu307 845

S. Ducharme, R. Durny, J. Hautala, O.G. Symko,P.C. Taylor, and Sudhir Kulkarni

ABSORPTION COMPONENT OF THE MAGNETIC SUSCEPTIBILITY INSUPERCONDUCTING YBa2Cu3O7 849

R. Durny, S. Ducharme, J. Hautala, O.G. Symko,P.C. Taylor, and Sudhir Kulkarni

A TUNNELING STUDY OF SUPERCONDUCTING YBa2Cu3Oy BYCONTACT JUNCTIONS AT 77 K 853

H.Enomoto, K.Gotoh, K.Iida, Y.Takano, N.Mori,and H. Ozaki

PHOTOINDUCED ABSORPTION IN THE LA2-xSrxCu04-δ SYSTEM:2 eV BANDGAP AND LONG-LIVED DEFECT STATES 857

A.J. Epstein, M.G. Roe, J.M. Ginder, F. Zuo,R.P. McCall, Y. Song, X.-D. Chen, J.P. Golben,J.R. Gaines, P.E. Wigen, and E. Ehrenfreund

LOGARITHMIC ROUNDING ABOVE THE SUPERCONDUCTINGTRANSITION IN YBa2Cu3O7 CRYSTALS 861

A.T. Fiory, A.F. Hebard, L.F. Schneemeyer,and J.V. Waszczak

LIGHT-INDUCED CURRENT SUPPRESSION OF SUPERCONDUCTINGYBa2Cu307-δ WEAK LINK 865

U. Kawabe, T. Nishino, Y. Tarutani, andH. Hasegawa

PRELIMINARY RESULTS ON YBCO/Nb BULK JUNCTION 869A. Barone, A. Di Chiara, G. Peluso, G. Pepe,M. Russo, and U. Scotti Di Uccio

USE OF HIGH-TEMPERATURE SUPERCONDUCTORS IN HIGH SPEEDELECTRONIC SWITCHES WITH CURRENT GAIN 873

Bryan A. Biegel and R. Singh

IRRADIATION EFFECTS INDUCED BY 2.5 MeV-ELECTRONS AND2.9 GeV-KRYPTON IONS IN THE HIGH Tc SUPERCONDUCTINGOXIDES 877

F. Studer, J. Provost, D. Groult, B. Raveau,S. Bouffard, M, Toulemonde, J,C. Jousset,and F. Rullier-Albenque

MAGNETISATION AND CRITICAL CURRENTS IN HIGH Tc POWDERS 883A.M. Campbell, A.D. Hibbs, J. Eberhardt, S. Male,M.F. Ashby, and J.E- Evetts

A STUDY OF THE TETRAGONAL-TO-ORTHORHOMBIC TRANSITION OFYBa2Cu3Ox BY DILATOMETRY 887

S.C. Han and Z.L. Wu

PART XIII: SUBSTITUTION, STRUCTURE, ETC. II

La!Ba2CU3O9-δ: STRUCTURAL ANALYSIS AS DETERMINED BYNEUTRON DIFFRACTION 89 5

J.P. Golben, Yi Song, S. Chittipeddi, S.I. Lee,R.D. McMichael, X.D. Chen, J.R. Gaines, D.L. Cox,and A.J. Epstein

X-RAY STUDY OF SUPERCONDUCTING Y1Ba2Cu3_xFex0y COMPOUNDS 899G. Gonzalez, D. Rios-Jara, T. Akachi, R. Barrio,L. Banos, and R. Escudero

EFFECT OF AMBIENT ATMOSPHERE ON YBa2CU3O7_y 903H.S. Horowitz, R.K. Bordia, R.B. Flippen, andR.E. Johnson

SYNTHESIS AND SUPERCONDUCTING PROPERTIES OF METASTABLEY(Ba2-xYx)Cu3O7+δ 907

Z. Iqbal, F. Reidinger, A. Bose, N. Cipollini,H. Eckhardt, B.L. Ramakrishna, and E.W. Ong

STRUCTURE AND Tc OF Lai_xYbxBa2Cu3O7_y LAYEREDPEROVSKITE SUPERCONDUCTORS 911

C. Jiang, S.M. Green, Yu Mei, H.L. Luo, andC. Politis

THERMAL CYCLING DEGRADATION OF YBa2Cu3O9_x SUPER-CONDUCTORS 915

Donald L. Kinser, Robert H. Magruder III,Ronald A. Quarles, and J. Dora Schaefer

HIGH RESOLUTION ELECTRON MICROSCOPY AND ELECTRONDIFFRACTION OF YBa2Cu3O7-x 919

William Krakow and Thomas M. Shaw

DIFFERENTIAL SCANNING CALORIMETRY AND GUINIER CAMERA/HIGH-TEMPERATURE X-RAY DIFFRACTION STUDIES OF THE

OXYGEN SUBLATTICE PHASE TRANSITION IN THE YBa2Cu3O7_xSYSTEM 923

David S. Lee, Zezhong Fu, Egon Hellstern,

William L. Johnson, Paul Pietrokowsky, andKonrad Samwer

THE MICROSCOPIC STUDY OF Y-Ba-Cu-0 COMPOUND 927W.T. Lin, H.C. Chu, B.H. Chen, Y.H- Chang,T.S. Chin, and P.T. Wu

METALLOGRAPHIC STUDIES OF SINTERED Y!Ba2Cu3O7_x 931J.D. Livingston, A.R. Gaddipati, and R.H. Arendt

THERMOGRAVIMETRIC STUDIES ON Ba2YCu3O7_x 935C. John Brannon, H.U. Anderson, and D.M. Sparlin

HYDROGEN IN YBa2Cu3O7_x HIGH Tc SUPERCONDUCTORS 939P. Berning, J. Collazo, A. Mashayekhi, andR,E. Benenson

X-RAY ABSORPTION STUDY OF Y1Ba2Cu3O7 AND GdiBa2Cu3O7SUPERCONDUCTORS 943

J.B. Boyce, F. Bridges, T. Claeson, R.S. Howland,and T.H. Geballe

ATOM PROBE MICROANALYSIS OF SUPERCONDUCTING YBa2Cu3O7_x 947S.S. Brenner and G.L. Kellogg

SUPERCONDUCTIVE PHASES AT" 150, -200 and 250 OR IN THESUBSTITUTED PEROVSKITE SERIES Y3_x (BaSr)xCu3O5-y 951

J.M, Dominguez, 0. Guzman, A. Montoya, P. Del Angel,D. Acosta, and C. Falcony

PROPERTIES AND STRUCTURES OF COPPER RICH Y-Ba-Cu-0SUPERCONDUCTORS 957

A.J. Drehman, J.A. Horrigan, and M.W. Dumais

TWINS IN YBa2Cu3O7_6 961

P.C. Gibbons, K.F. Kelton, Z.-Y. Li, L. Mantese,and L. Sobotka

STRUCTURE OF WATER AND ELECTRON BEAM DAMAGED HIGHTEMPERATURE SUPERCONDUCTORS 965

J.P. Zhang, D.J. Li, and L.D- Marks

THE ROLE OF H IN SUPERCONDUCTING HxYBa2Cu3O7 969C.Y. Yang, S.M. Heald, J.J. Reilly, andM. Suenaga

ALUMINUM INCORPORATION IN CUPRATE PEROVSKITES 973T. Siegrist, L.F. Schneemeyer, J.V. Waszczak,

S.A. Sunshine, N.P. Singh, R.L, Opila, B,Batlogg, L.W. Rupp, and D.W. Murphy

KINETICS AND THERMODYNAMICS OF THE REACTION OF MOLECULAROXYGEN WITH YBa2Cu3Ox 977

W.E. Farneth, R.K. Bordia, M.K. Crawford, L. Abrams,M.A. Subramanian, and E.M. McCarron III

MAGNETIC PROPERTIES OF SUPERCONDUCTING GdBa2Cu306+ ATLOW TEMPERATURE AND HIGH FIELD 981

C.Y. Huang, Y. Shapira, P.H. Hor, R.L. Meng,and C.W. Chu

THE GRANULAR BEHAVIOR OF LaSrCuO: OXYGEN CONCENTRATIONEFFECTS ON THE ELECTRICAL RESISTIVITY 985

E.Osquiguil, L.Civale, R.Decca, H.Safar,E.Martinez, G.Nieva, and F.De La Cruz

AUTHOR INDEX 989

SUBJECT INDEX 997