ORDER AND DISORDER IN (ND,CE)NO2NSR2GACU2O5 AND YSR2COCU2O7

被引:56
作者
KREKELS, T [1 ]
MILAT, O [1 ]
VANTENDELOO, G [1 ]
AMELINCKX, S [1 ]
BABU, TGN [1 ]
WRIGHT, AJ [1 ]
GREAVES, C [1 ]
机构
[1] UNIV BIRMINGHAM,SCH CHEM,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND
关键词
D O I
10.1006/jssc.1993.1222
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The structures of the compounds YSr2CoCu2O7 and (Nd/Ce)Sr2GaCu2O5 and (Nd/Ce)2Sr2GaCu2O9 [(Nd/Ce)nSr2GaCu2O5+2n, n = 1, 2,…] are considered as derivatives of the prototype 123-phase. They were previously found to contain layers of corner-sharing M O4 tetrahedra. In this paper we describe the superstructures which consist of a regular alternation of the two types of symmetry related M O-chains leading to period doubling along the direction normal to the chains. These conclusions are based on electron diffraction and on direct image evidence from high resolution electron microscopy. Both compounds are fragmented in domains resulting from the two crystallographically equivalent orientations of the chains which differ by 90°. Both compounds contain linear defects confined to one MO-layer. Twin “lines” are due to orientation changes of the chains within a single MO-layer and antiphase boundary lines result from the parallel shift over one interchain distance, of two parts of a layer. © 1993 Academic Press, Inc.
引用
收藏
页码:313 / 335
页数:23
相关论文
共 24 条
[1]   A NEW TYPE OF CRYSTAL-STRUCTURE IN THE PB-PR-SR-CU-O SYSTEM [J].
ADACHI, S ;
INOUE, O ;
KAWASHIMA, S ;
ADACHI, H ;
ICHIKAWA, Y ;
SETSUNE, K ;
WASA, K .
PHYSICA C, 1990, 168 (1-2) :1-7
[2]   SUPERCONDUCTIVITY IN MULTIPLE PHASE SR2LN1-XCAXGACU2O7 AND CHARACTERIZATION OF LA2-XSRXCACU2O6+DELTA [J].
CAVA, RJ ;
VANDOVER, RB ;
BATLOGG, B ;
KRAJEWSKI, JJ ;
SCHNEEMEYER, LF ;
SIEGRIST, T ;
HESSEN, B ;
CHEN, SH ;
PECK, WF ;
RUPP, LW .
PHYSICA C, 1991, 185 (pt 1) :180-183
[3]   SUPERCONDUCTIVITY AT 28-K IN A CUPRATE WITH A NIOBIUM OXIDE INTERMEDIARY LAYER [J].
CAVA, RJ ;
KRAJEWSKI, JJ ;
TAKAGI, H ;
ZANDBERGEN, HW ;
VANDOVER, RB ;
PECK, WF ;
HESSEN, B .
PHYSICA C, 1992, 191 (1-2) :237-242
[4]   NEW FAMILY OF SUPERCONDUCTING COPPER OXIDES - GASR2LN1-XCAXCU2O7 [J].
DABROWSKI, B ;
RADAELLI, P ;
HINKS, DG ;
MITCHELL, AW ;
VAUGHEY, JT ;
GROENKE, DA ;
POEPPELMEIER, KR .
PHYSICA C, 1992, 193 (1-2) :63-67
[5]   SUPERCONDUCTIVITY ABOVE 90-K IN THE COMPOUND YBA2CU3OX - STRUCTURAL, TRANSPORT, AND MAGNETIC-PROPERTIES [J].
GRANT, PM ;
BEYERS, RB ;
ENGLER, EM ;
LIM, G ;
PARKIN, SSP ;
RAMIREZ, ML ;
LEE, VY ;
NAZZAL, A ;
VAZQUEZ, JE ;
SAVOY, RJ .
PHYSICAL REVIEW B, 1987, 35 (13) :7242-7244
[6]   NB AND TA SUBSTITUTIONS IN YBA2CU3O7-X AND RELATED PHASES - STRUCTURAL CHARACTERIZATION OF LA1.1BA1.9CU2.1M0.9O8 (M=NB,TA) [J].
GREAVES, C ;
SLATER, PR .
PHYSICA C, 1989, 161 (02) :245-251
[7]   CRYSTALLOGRAPHIC DESCRIPTION OF PHASES IN THE Y-BA-CU-O SUPERCONDUCTOR [J].
HAZEN, RM ;
FINGER, LW ;
ANGEL, RJ ;
PREWITT, CT ;
ROSS, NL ;
MAO, HK ;
HADIDIACOS, CG ;
HOR, PH ;
MENG, RL ;
CHU, CW .
PHYSICAL REVIEW B, 1987, 35 (13) :7238-7241
[8]   NEUTRON POWDER DIFFRACTION STUDY OF THE CRYSTAL-STRUCTURE OF YSR2COCU2O7 AND Y1-XCAXSR2COCU2O7 [J].
HUANG, Q ;
CAVA, RJ ;
SANTORO, A ;
KRAJEWSKI, JJ ;
PECK, WF .
PHYSICA C, 1992, 193 (1-2) :196-206
[9]   PLANAR DEFECTS IN YBA2CU4O8 [J].
KREKELS, T ;
VANTENDELOO, G ;
AMELINCKX, S ;
DELEEUW, DM ;
DEKRAAN, M .
PHYSICA C, 1990, 169 (5-6) :457-463
[10]  
LI RK, 1991, PHYSICA C, V176, P19, DOI 10.1016/0921-4534(91)90689-V