DEFECTS AND FLUX CONTAMINATION IN ND2-XCEXCUO4, GD2-XCEXCUO4 CRYSTALS - OXYGEN DISORDER IN GD2CUO4 CRYSTALS

被引：37

作者：

GALEZ, P

SCHWEISS, P

COLLIN, G

BELLISSENT, R

机构：

[1] CENS,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE

[2] KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST NUKL FESTKORPERPHYS,W-7500 KARLSRUHE 1,GERMANY

[3] INST MINERAL MARBURG,W-3550 MARBURG,GERMANY

[4] UNIV PARIS 11,CNRS,URA 2,PHYS SOLIDES LAB,F-91405 ORSAY,FRANCE

来源：

JOURNAL OF THE LESS-COMMON METALS | 1990年 / 164卷

关键词：

D O I：

10.1016/0022-5088(90)90484-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The structure of several Nd2-xCexCuO4 (x = 0 and x = 0.18) and Gd2CuO4 single crystals is investigated by means of X-ray and neutron diffraction. All crystals have the Nd2CuO4 tetragonal T' structure, space group 14/mmm. Single crystals for X-ray diffraction, prepared either by spontaneous crystallisation or growth from a flux (CuO), exhibit a significant copper deficiency. The oxygen of the CuO2 planes in Gd2CuO4 is found off-centered in the a direction. Larger Nd2CuO4 crystals, suitable for neutron diffraction, were produced with a higher amount of CuO in excess. In most of them, inclusions of Cu2O having their [110] or [111] direction perfectly aligned along the c-axis of Nd2CuO4 were detected. Structural refinement of a Cu2O free single crystal indicates a full occupancy of the Cu site but vacancies on both oxygen sites. © 1990.

引用

页码：784 / 791

页数：8

共 18 条

[1] EFFECT OF CE DOPING ON THE CU CHARGE IN THE ELECTRON SUPERCONDUCTOR ND2-XCEXCUO4 [J].

ALP, EE ;

MINI, SM ;

RAMANATHAN, M ;

DABROWSKI, B ;

RICHARDS, DR ;

HINKS, DG .

PHYSICAL REVIEW B, 1989, 40 (04) :2617-2619

[2] XPS STUDY OF THE NEW SUPERCONDUCTOR ND-CE-CU-O [J].

FLIPSE, CFJ ;

EDVARDSSON, S ;

KADOWAKI, K .

PHYSICA C, 1989, 162 :1389-1390

[3] VALENCE-BAND AND CU 2P CORE-LEVEL ELECTRONIC-STRUCTURES OF ND2-XCEXCUO4 STUDIED BY X-RAY PHOTOEMISSION [J].

FUKUDA, Y ;

SUZUKI, T ;

NAGOSHI, M ;

SYONO, Y ;

OHISHI, K ;

TACHIKI, M .

SOLID STATE COMMUNICATIONS, 1989, 72 (12) :1183-1186

[4] STRUCTURAL ANOMALIES IN ND2-XCEXCUO4-Y - EVIDENCE FOR MIXED-VALENCE AND CHARGE-TRANSFER [J].

HOR, PH ;

XUE, YY ;

SUN, YY ;

TAO, YC ;

HUANG, ZJ ;

RABALAIS, W ;

CHU, CW .

PHYSICA C, 1989, 159 (05) :629-633

[5] DETERMINATION OF THE AVERAGE IONIC RADIUS AND EFFECTIVE VALENCE OF CE IN THE ND2-XCEXCUO4 ELECTRON SUPERCONDUCTOR SYSTEM BY X-RAY-DIFFRACTION [J].

HUANG, TC ;

MORAN, E ;

NAZZAL, AI ;

TORRANCE, JB ;

WANG, PW .

PHYSICA C, 1989, 159 (05) :625-628

[6] NEUTRON AND ELECTRON-DIFFRACTION STUDY OF THE ELECTRON-DOPED SUPERCONDUCTOR ND1.845CE0.155CUO4-Y [J].

IZUMI, F ;

MATSUI, Y ;

TAKAGI, H ;

UCHIDA, S ;

TOKURA, Y ;

ASANO, H .

PHYSICA C, 1989, 158 (03) :433-439

[7] PROCESSING AND SUPERCONDUCTING PROPERTIES OF THE ELECTRON-DOPED COMPOUNDS LN2-XMXCUO4-Y (LN = PR, ND, SM, EU, GD, M = CE, TH) [J].

MARKERT, JT ;

AYOUB, NY ;

BJORNHOLM, T ;

EARLY, EA ;

SEAMAN, CL ;

TSAI, PK ;

MAPLE, MB .

PHYSICA C, 1989, 162 :957-958

[8] HIGH-TEMPERATURE SUPERCONDUCTIVITY IN TH-DOPED ND2CUO4-Y [J].

MARKERT, JT ;

MAPLE, MB .

SOLID STATE COMMUNICATIONS, 1989, 70 (02) :145-147

[9] 2 NEW ELECTRON CUPRATE SUPERCONDUCTORS, PR1.85TH0.15CUO4-Y AND EU1.85CE0.15CUO4-Y, AND PROPERTIES OF ND2-XCEXO4-Y [J].

MARKERT, JT ;

EARLY, EA ;

BJORNHOLM, T ;

GHAMATY, S ;

LEE, BW ;

NEUMEIER, JJ ;

PRICE, RD ;

SEAMAN, CL ;

MAPLE, MB .

PHYSICA C, 1989, 158 (1-2) :178-182

[10] EXTRA OXYGEN IN ELECTRON SUPERCONDUCTORS - CE AND TH DOPED ND2CUO4+DELTA AND GD2CUO4+DELTA [J].

MORAN, E ;

NAZZAL, AI ;

HUANG, TC ;

TORRANCE, JB .

PHYSICA C, 1989, 160 (01) :30-34

← 1 2 →