Low-Temperature Vacuum Reduction of BiMnO3

被引：11

作者：

Belik, Alexei A. ^{[1
]}

Matsushita, Yoshitaka ^{[2
]}

Tanaka, Masahiko ^{[2
]}

Takayama-Muromachi, Eiji ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton MANA, Tsukuba, Ibaraki 3050044, Japan

[2] Natl Inst Mat Sci, SPring Off 8, Sayo, Hyogo 6795148, Japan

来源：

INORGANIC CHEMISTRY | 2011年 / 50卷 / 16期

基金：

日本学术振兴会;

关键词：

CRYSTAL-STRUCTURE; LAMNO3+DELTA; STOICHIOMETRY; ORDER;

D O I：

10.1021/ic2007233

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Low-temperature vacuum reduction was used for the preparation of the oxygen-deficient BiMnO2.81 sample in a bulk form from stoichiometric BiMnO3. The transformation occurs in vacuum better than 10(-3) Pa at a narrow temperature range of 570-600 K. The structure of the new phase was analyzed using synchrotron X-ray powder diffraction data. BiMnO2.81 crystallizes in a perovskite-type cubic structure (space group I-43d) with a = 15.88552(S) angstrom corresponding to a 4a(p) superstructure, where a(p) is the parameter of the cubic perovskite subcell. Oxygen vacancies are ordered, and one oxygen site in BiMnO2.81 is completely vacant, resulting in MnOs pyramids. BiMnO2.81 is rather unstable in air and slowly restores its oxygen content even at room temperature.

引用

页码：7685 / 7689

页数：5

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