Thermal and chemical expansion properties of La0.2Sr0.8Fe0.55Ti0.45O3-x

被引：33

作者：

Park, CY ^{[1
]}

Jacobson, AJ ^{[1
]}

机构：

[1] Univ Houston, Dept Chem, Ctr Mat Chem, Houston, TX 77204 USA

来源：

SOLID STATE IONICS | 2005年 / 176卷 / 35-36期

关键词：

La0.2Sr0.8Fe0.55Ti0.45O3-x; perovskite oxide; thermal expansion; chemical expansion; oxygen non-stoichiometry; coulometric titration;

D O I：

10.1016/j.ssi.2005.08.003

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 and chemical expansion coefficients for La0.2Sr0.8Fe0.55Ti0.45O3-x were measured at 800 <= T <= 1200 degrees C and at similar to 1 x 10(-15) <= pO(2)<= 0.21 atm. Measurements of the total expansion coefficient in air, on heating and cooling between room temperature and 1200 degrees C, are reproducible. The average thermal expansion coefficient of La(0.2)Sr(0.8)Fc(0.55)T(i0.45)O(3-x) is 9.3 +/- 1.1 X 10(-6) K-1 over the whole temperature range, similar to the values reported for other titanium substituted perovskites and yttria-stabilized zirconia. The chemical expansion coefficients measured at 800 degrees C vary linearly with the degree of oxygen non-stoichiometry. At higher temperatures, the chemical expansion shows a pronounced non-linear dependence on stoichiometry. At oxygen partial pressures below similar to 10(-6) atm, the expansion shows evidence of the slow kinetic behavior previously observed in stoichiometry and conductivity measurements. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：2671 / 2676

页数：6

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