STRUCTURES AND PROPERTIES OF LA1-XSRXCOO3-Y PREPARED BY FREEZE-DRYING

被引：33

作者：

KIRCHNEROVA, J ^{[1
]}

HIBBERT, DB ^{[1
]}

机构：

[1] ECOLE POLYTECH, DEPT MET & MAT ENGN, MONTREAL H3C 3A7, QUEBEC, CANADA

来源：

JOURNAL OF MATERIALS SCIENCE | 1993年 / 28卷 / 21期

关键词：

D O I：

10.1007/BF00365184

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Several samples of La1-xSrxCoO3-y (x = 1, 0.8, 0.5, 0.2) were prepared by calcining freeze-dried, stoichiometric mixtures of nitrates at different temperatures and for different lengths of time. Selected samples were characterized by powder X-ray diffraction, conductivity measurements, Brunauer-Emmett-Teller surface area measurement, and by electrochemical cyclic voltammetry in alkaline solutions and alkaline solutions containing methanol. The structures of each composition were complex and varied with composition and preparation conditions. There is evidence for non-stoichiometry caused by oxygen anion vacancies. For La0.5Sr0.5CoO3-y the electrochemical activity towards the oxidation of methanol is a maximum at the fully formed cubic perovskite. The oxidation currents at La0.8Sr0.2CoO3-y and La0.2Sr0.8CoO3-y go through maxima at more distorted structures.

引用

页码：5800 / 5808

页数：9

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