Ferroelastic Domain Reorientations and Its Influence on Mechanical Properties of La0.6Sr0.4Co0.2Fe0.8O3-δ

被引：7

作者：

Kimura, Yuta ^{[1
]}

Yashiro, Keiji ^{[1
]}

Hashimoto, Shin-ichi ^{[2
]}

Kawada, Tatsuya ^{[1
]}

机构：

[1] Tohoktt Univ, Grad Sch Environm Studies, Aoba Ku, Sendai, Miyagi 9808579, Japan

[2] Tohoku Univ, Grad Sch Engn, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2014年 / 161卷 / 11期

关键词：

TRANSFORMATION TWINS; POLYCRYSTALLINE CA1-XSRXTIO3; THERMOCHEMICAL STABILITY; OXYGEN NONSTOICHIOMETRY; PEROVSKITE; TEMPERATURE; BEHAVIOR;

D O I：

10.1149/2.0131411jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The temperature dependency of the dynamic Young's modulus and of the internal friction of La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF6428) was investigated by dynamic mechanical analysis. The significant decrease in the storage modulus of LSCF6428 with low oxygen vacancy concentration (LSCF1) and a following broad and asymmetric peak (P1) were interpreted as resulting from the motion of ferroelastic domain walls with a distribution of the relaxation time. The storage modulus of the LSCF6428 with higher oxygen vacancy concentration (LSCF2 and 3) was significantly larger than that of the LSCF1 at low temperatures. The P1 was barely observed with LSCF2 and 3. The increase in the storage modulus and the suppression of the peak P1 with increasing the oxygen vacancy concentration can be explained mainly by the pinning effect of the oxygen vacancies: This suggests that the oxygen vacancies play a vital role in determining the mobility of the ferroelastic domains in LSCF6428. (C) 2014 The Electrochemical Society: All rights reserved.

引用

页码：F3079 / F3083

页数：5

共 24 条

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