An anomalous thermal expansion in the perovskite system, Gd1-xSrxMnO3 (0 ≤ x ≤ 0.3)

被引：12
|
作者：
Hirano, A [1 ]
Hirano, F [1 ]
Matsumura, T [1 ]
Imanishi, N [1 ]
Takeda, Y [1 ]
机构：
[1] Mie Univ, Fac Engn, Dept Chem, Tsu, Mie 5148507, Japan
来源：
SOLID STATE IONICS | 2006年 / 177卷 / 7-8期
关键词：
thermal expansion; negative thermal expansion; Gd1-xMnO3; Jahn-Teller effect; SOFC;
D O I：
10.1016/j.ssi.2006.01.021
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：
The thermal expansion behavior of sintered samples of Gd1-xSrxMnO3 (X=0.0-0.4) was studied. The sintered bodies in this system showed negative thermal expansion over a wide temperature range. The detailed crystal structure refinements with respect to temperature showed that the volume of the orthorhombic perovskite lattice monotonically increased with temperature, however, in addition to this, the release of distortion from the Jahn-Teller effect of Mn3+ ion occurred over a wide temperature range, which brought the negative expansion of the a-axis, although the b- and c-axes increased with temperature. The anomalous thermal expansion is explained by the sum of the effects of the shrinkage of the a-axis and absorption of the b- and c-axes' expansion by the pores in the sintered body. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：749 / 755
页数：7
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