THE SYNTHESIS AND STRUCTURE OF THE NEW PHASE CA0.85CUO2

被引：48

作者：

BABU, TGN

GREAVES, C

机构：

[1] Superconductivity Research Group School, Chemistry University of Birmingham Birmingham

来源：

MATERIALS RESEARCH BULLETIN | 1991年 / 26卷 / 06期

关键词：

CALCIUM; COPPER; OXIDES;

D O I：

10.1016/0025-5408(91)90190-W

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new phase, Ca0.85CuO2, has been synthesised and investigated using powder X-ray and neutron diffraction. The structure is closely related to that of NaCuO2 with chains of edge-shared CuO4 units linking layers of octahedrally coordinated Ca ions, but partial occupancy of the Ca sites results in an incommensurate superstructure. Structure refinement based on an orthorhombic subcell (Fmmm; a = 6.3206, b = 2.8067, c = 10.5735 angstrom) has revealed a possible mechanism for the occurrence of the superstructure. Regions of monoclinic symmetry and composition CaCuO2 are separated by boundaries of Ca vacancies with adjacent domains having CuO4 chains tilted in opposite directions.

引用

页码：499 / 506

页数：8

共 14 条

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