Phase transition of Ba2In2O5 in humid air studied by in-situ X-ray powder diffraction

被引：4

作者：

Fischer, W ^{[1
]}

Reck, G

Schober, T

机构：

[1] Forschungszentrum Julich, IWV & IFF, DE-52425 Julich, Germany

[2] Bundesanstalt Mat Forsch & Prufung, DE-12200 Berlin, Germany

来源：

EUROPEAN POWDER DIFFRACTION, PTS 1 AND 2 | 2000年 / 321-3卷

关键词：

X-ray powder diffraction; high-temperature; phase transition; crystal structure determination; Rietveld refinement; Ba(2)In(2)O(5); solid state electrolyte; solid oxide fuel cell;

D O I：

10.4028/www.scientific.net/MSF.321-324.363

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The oxygen and proton conductor Ba(2)In(2)O(5) is known to undergo a phase transformation in humid atmosphere at about 300 degrees C. The resulting phase, Ba(2)In(2)O(5). H(2)O (beta-phase), was investigated by insitu high-temperature X-ray diffraction. During the transition, a transient structure existing near 320 degrees C in a narrow temperature range is formed. The beta-phase is stable from approximate to 300 degrees C down to room temperature and may be characterized by S.G. P4/mmm, No.123, tetragonal, with a = 4.1827(10) Angstrom and c = 8.9617(10) Angstrom. The atomic rearrangement during the transformation together with the change of the coordination of one half of the In atoms from tetrahedral to octahedral symmetry reduces the unit cell volume of the beta-phase to one quarter of the initial value. Linear thermal expansion coefficients of both phases show a strong anisotropy.

引用

页码：363 / 367

页数：5

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