Low-temperature synthesis, structure, and stability of Ba2+yCu3O6

被引：9

作者：

Brosha, EL ^{[1
]}

Garzon, FH ^{[1
]}

Raistrick, ID ^{[1
]}

Davies, PK ^{[1
]}

机构：

[1] UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1996年 / 122卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1006/jssc.1996.0099

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Single-phase powders of Ba2Cu3O6 have been prepared at 620 degrees C under 1 atm of oxygen using freeze-dried nitrate precursors. Calcinations utilizing a precursor with a 1:1 Ba:Cu stoichiometry produced a two-phase mixture of BaO2 + Ba-2 Cu3O6 and confirmed the stable, oxidized barium cuprate exists with a metal ion ratio close to 2:3. Diffraction studies suggest that Ba2Cu3O6 (Ba0.67CuO2) crystallizes in a structure closely related to the linear chain KCuO2 and NaCuO2 cuprates. It is proposed that the reduction of copper and accompanying loss of oxygen observed above 620 degrees C are accommodated by an increase in the Ba content of the structure and the formation of Ba2+yCu3O6 with 0 less than or equal to y less than or equal to 0.25. Above 710 degrees C, the high-y end member is metastable with respect to BaCuO2, although it decomposes slowly even at elevated temperatures. (C) 1996 Academic Press, Inc.

引用

页码：176 / 185

页数：10

共 31 条

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