Two mechanisms of thermal expansion in perovskite SrCo0.6Fe0.2Nb0.2O3-z

被引：15

作者：

Ivanov, M. G. ^{[1
]}

Shmakov, A. N. ^{[1
,2
]}

Drebushchak, V. A. ^{[2
,3
]}

Podyacheva, O. Yu. ^{[1
]}

机构：

[1] Boreskov Inst Catalysis SB RAS, Novosibirsk 630090, Russia

[2] Novosibirsk State Univ, Novosibirsk 630090, Russia

[3] Inst Geol & Mineral SB RAS, Novosibirsk 630090, Russia

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2010年 / 100卷 / 01期

关键词：

Oxygen membrane; Perovskite; Thermogravimetry; XRPD; SOLID-SOLUTIONS;

D O I：

10.1007/s10973-009-0008-5

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Perovskite SrCo0.6Fe0.2Nb0.2O3-z attracts attention as a promising material with high oxygen conductivity. The sample was investigated by means of high-temperature X-ray powder diffraction and thermogravimetry. Phase transition was detected near 400 A degrees C and accompanied with significant mass loss. The phase transition affects oxygen mobility, important for the synthesis of oxygen permeable membranes. The unit cell parameters are proved to change with temperature after two effects (1) reversible conventional thermal expansion and (2) irreversible contraction-expansion due to the changes in the oxygen content. In situ high-temperature X-ray diffraction experiments allowed us to separate the contributions and to measure them as a function of temperature.

引用

页码：79 / 82

页数：4

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