ISSN:
1572-8943
Keywords:
(Ba1–xLax)2In2O5+x
;
Brownmillerite structure
;
ion conductivity
;
order-disorder transition
;
perovskite-related structure
;
thermogravimetry
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The structural characterization, thermogravimetric analysis and electrical properties for solid solution system, (Ba1–xLax)2In2O5+x with perovskite-type structure were investigated. X-ray diffraction showed that the orthorhombic phase was in the range of 0.0〈x≤0.3, the tetragonal phase 0.3〈x≤0.5, and the cubic phase 0.5〈x. The sharp transition of electrical conductivity shifted to a lower temperature with increasing x and disappeared at the phase boundary between the orthorhombic and tetragonal phases. This perovskite-related oxide exhibited a pure oxide-ion conduction over the oxygen partial pressure range of 1 atm to 10−3.5 atm, and the electrical conductivity reached the value of 1.6⋅10−1 (S cm−1) at 1073 K, which was nearly equal to that of the yttria stabilized zirconia. These properties were successfully explained in terms of disordered oxygen ions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1010117503009
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