The crystal structures, microstructure and ionic conductivity of Ba2In2O5 and Ba(InxZr1-x)O3-x/2

被引:97
作者
Berastegui, P [1 ]
Hull, S
García-García, FJ
Eriksson, SG
机构
[1] Univ Stockholm, Arrhenius Lab, Dept Inorgan Chem, S-10691 Stockholm, Sweden
[2] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
[3] Uppsala Univ, Studsvik Neutron Res Lab, S-61182 Nykoping, Sweden
关键词
Ba2In2O5; neutron powder diffraction; electron microscopy; phase transition; ionic conductivity;
D O I
10.1006/jssc.2001.9455
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
This paper describes the results of electron microscopy, high-temperature powder neutron diffraction, and impedance spectroscopy studies of brownmillerite-structured Ba2In2O5 and perovskite structured Ba(InxZr1-x)O3-x/2. The ambient temperature structure of Ba(2)In(2)O(5)is found to adopt Icmm symmetry, with disorder of the tetrahedrally coordinated (In3+) ions of the type observed previously in Sr2Fe2O5. Ba2In2O5 undergoes a similar to 6-fold increase in its ionic conductivity over the narrow temperature range from similar to 1140 K to similar to 1230 K, in broad agreement with previous studies. This transition corresponds to a change from the brownmillerite structure to a cubic perovskite arrangement with disordered anions. Electron microscopy investigations show the presence of extended defects in all the crystals analyzed. Ba(InxZr1-x)O3-x/2 samples with x = 0.1 to 0.9 adopt the cubic perovskite structure, with the lattice parameter increasing with x. (C) 2002 Elsevier Science (USA).
引用
收藏
页码:119 / 130
页数:12
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