OXYGEN AND THE FORMATION OF NEW ORDERED PEROVSKITE-BASED STRUCTURES IN THE BI-SR-O SYSTEM

被引：12

作者：

BOKHIMI ^{[1
]}

PORTILLA, M ^{[1
]}

机构：

[1] NATL AUTONOMOUS UNIV MEXICO, DEPT CHEM, MEXICO CITY 01000, DF, MEXICO

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1993年 / 105卷 / 02期

关键词：

D O I：

10.1006/jssc.1993.1227

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

We have found one amorphous and three crystalline phases in the Bi-Sr-O system for Sr:Bi molar ratios between 1.0 and 3.0. A first approximation for the structure of two of the crystalline phases was obtained. They are based on the perovskite structure. One of the phases has the composition Sr10Bi6O24-y, which is cubic with space group Fm3m and cell parameter a = 8.476(2) Å. It is obtained only if the sample is slow cooled from temperatures above 600°C in an oxygen-containing atmosphere. The second phase has the composition Sr6Bi2O12-y, which is tetragonal with space group I4/mmm, cell parameters a = 6.0058(3) and c = 8.3718(5) Å. This phase is obtained only if the sample is prepared in an oxygen-containing amtosphere. We observe that oxidation of part of the bismuth atoms is necessary to obtain the above-described phases. © 1993 Academic Press, Inc.

引用

页码：371 / 377

页数：7

共 17 条

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