Correlation between thermodynamic and thermomechanical quantities of selected perovskite-type oxides

被引：2

作者：

Girdauskaite, E. ^{[1
]}

Vashook, V. V. ^{[1
]}

Ullmann, H. ^{[1
]}

Vasylechko, L. ^{[2
]}

Guth, U. ^{[1
,3
]}

机构：

[1] Tech Univ Dresden, Dept Chem & Food Chem, D-01062 Dresden, Germany

[2] Lviv Polytech Natl Univ, UA-79013 Lvov, Ukraine

[3] Kurt Schwabe Inst Measuring & Sensor Technol Mein, D-04720 Ziegra Knobelsdorf, Germany

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 477卷 / 1-2期

关键词：

Perovskite-type oxides; Thermal expansion; Oxygen stoichiometry; Lattice constants; Thermodynamic properties; THERMAL-EXPANSION; CONDUCTIVITY; PERMEATION; TRANSPORT;

D O I：

10.1016/j.jallcom.2008.10.121

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：

oxygen deficiencies, lattice parameters and thermal expansion of Ca0.5Sr0.5 Mn1-bFebO3-x (b = 0.1, 0.2, 0.5) have been measured by thermogravimetry, dilatometry, high-temperature diffraction of synchrotron radiation and compared with other familiar perovskite-type oxides A(1-a)A'aB1-bB'O-b(3-x) (A, A' = La, Sr, Ba; B, B' = Mn, Fe, Co). The oxygen-to-metal (O/M)-stoichiometry (3 - x) as well as negative partial molar free energy (Delta G'(ax)) for oxidation reaction of perovskites decrease with increasing temperature, decreasing oxygen partial pressure and B-site substitution in the series Mn-Fe-Co. Thermal expansion and unit cell volume increase with increasing oxygen deficiency. Correlations between thermodynamic stability and thermal expansion with chemical composition and lattice parameters are investigated. (C) 2008 Published by Elsevier B.V.

引用

页码：468 / 472

页数：5

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