Hydration behavior of Ba2Sc2O5 with an oxygen-deficient perovskite structure

被引：14
|
作者：
Omata, Takahisa [1 ]
Fuke, Tomonao [1 ]
Otsuka-Yao-Matsuo, Shinya [1 ]
机构：
[1] Osaka Univ, Grad Sch Engn, Div Mat & Mfg Sci, Suita, Osaka 5650871, Japan
来源：
SOLID STATE IONICS | 2006年 / 177卷 / 26-32期
关键词：
proton conductor; barium scandate; hydration; thermogravimetry; electrical conductivity;
D O I：
10.1016/j.ssi.2006.05.044
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：
The hydration behavior of the barium scandates with oxygen-deficient perovskite-related structures of tetragonal Ba2Sc2O5 and cubic BaScO3-delta (delta similar to 0.5) was studied. Both the tetragonal Ba2Sc2O5 and cubic BaScO3-delta absorbed water and formed Ba2Sc2O5 center dot 0.6OH(2)O and BaScO3-delta center dot 0.37H(2)O, respectively, during cooling in a humidified atmosphere. The hydration and the dehydration temperatures for the barium scandates were similar to 533 K and similar to 553 K, respectively; these temperatures were 30-70 K lower than that for Ba2In2O5. A distinct difference in the hydration behavior of the structurally different tetragonal Ba2Sc2O5 and cubic BaScO3-delta was not observed. The Ba2Sc2O5 shows protonic conduction below 673 K and p-type conduction above 773 K in a humidified atmosphere. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：2447 / 2451
页数：5
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