Lattice creation and annihilation of LaMnO3+δ caused by nonstoichiometry change

被引：40

作者：

Miyoshi, S

Hong, JO

Yashiro, K

Kaimai, A

Nigara, Y

Kawamura, K

Kawada, T

Mizusaki, J

机构：

[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan

[2] Tokyo Inst Technol, Grad Sch Sci & Engn, Meguro Ku, Tokyo 1528553, Japan

来源：

SOLID STATE IONICS | 2002年 / 154卷

关键词：

LaMnO3+delta; dilatometry; oxygen-excess nonstoichiometry; cation vacancy; microstructure evolution;

D O I：

10.1016/S0167-2738(02)00441-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In order to identify the majority ionic defect of La1-xSrMnO3+delta in the oxygen-excess region, a dilatometry was made on La0.96MnO2.94+delta at a fixed temperature (1273 K) by varying the ambient oxygen partial pressure. The specimen of La0.96MnO2.94+delta expanded with increasing P-O2 in the region of delta>0, while the unit cell volume was known to decrease with increasing P-O2. The morphological evolution was also observed on the surface of the La0.96MnO2.94+delta specimen after annealing in an oxidizing atmosphere, indicating that the new lattices were created. From these results, it is concluded that the majority ionic defect of the perovskite oxide, La1-xSrxMnO3+delta, is cation vacancies in the oxygen-excess region. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：257 / 263

页数：7

共 10 条

[1] A new candidate for the solid oxide fuel cell cathode, Y0.9Ca0.1FeO3 - Electrical transport properties and defect structure [J].