STRUCTURE-ANALYSIS OF OXYGEN-DEFICIENT TLSR2CUOY BY NEUTRON-DIFFRACTION AND HIGH-RESOLUTION ELECTRON-MICROSCOPY

被引：19

作者：

OHSHIMA, E

KIKUCHI, M

IZUMI, F

HIRAGA, K

OKU, T

NAKAJIMA, S

OHNISHI, N

MORII, Y

FUNAHASHI, S

SYONO, Y

机构：

[1] NATL INST RES INORGAN MAT,TSUKUBA,IBARAKI 305,JAPAN

[2] KYOTO UNIV,FAC ENGN,DEPT MET SCI & TECHNOL,SAKYO KU,KYOTO 606,JAPAN

[3] JAPAN ATOM ENERGY RES INST,DEPT MAT SCI & ENGN,TOKAI,IBARAKI 31911,JAPAN

来源：

PHYSICA C | 1994年 / 221卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(94)90231-3

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The crystal structure of orthorhombic TlSr2CuOy was determined by Rietveld analysis of neutron powder diffraction data with the aid of electron diffraction and high-resolution electron microscopy. We found that oxygen vacancies are formed along the a-direction in a CuO2-z sheet, which is consistent with a superstructure of twice the subcell along the b-direction. CuO6 octahedra and CuO4 square planes alternate along the b-direction by sharing their comers in accordance with the ordered oxygen vacancies in the CuO2-z sheet. An apical oxygen atom in the CuO6 octahedron is nearer to a TlO layer than an oxygen atom shared by a TlO6 octahedron and the CuO4 plane. A crystal-structure image obtained by high-resolution electron microscopy could be successfully reproduced by computer simulation using structure parameters obtained by neutron powder diffraction.

引用

页码：261 / 268

页数：8

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