Effect of potassium substituted for A-site of SrCe0.95Y0.05O3 on microstructure, conductivity and chemical stability

被引：15
|
作者：
Liv, Chi [1 ]
Huang, Jian-Jia [1 ]
Fu, Yen-Pei [2 ]
Li, Chuan [3 ]
Wang, Jian-Yih [2 ]
Lee, Shyong [1 ]
机构：
[1] Natl Cent Univ, Dept Mech Engn, Taoyuan 32001, Taiwan
[2] Natl Dong Hwa Univ, Dept Mat Sci & Engn, Shoufeng 97401, Hualien, Taiwan
[3] Natl Yang Ming Univ, Dept Biomed Engn, Taipei 11221, Taiwan
来源：
CERAMICS INTERNATIONAL | 2015年 / 41卷 / 02期
关键词：
Ceramics; X-ray diffraction; Defects; Electrical properties; HYDROGEN-PERMEATION; GRAIN-SIZE; MEMBRANE; SEPARATION;
D O I：
10.1016/j.ceramint.2014.10.126
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The chemical stability of potassium substituted for A-site of SrCe0.95Y0.05O3 specimens was examined under CO2 atmosphere treated at 600 degrees C and further analyzed by X-ray diffractometer to see their CO2-resisted capabilities. According to thermodynamic data, the Gibbs free energy of CeO2 was lower than that of SrCO3 at the temperature of 600 degrees C. Thus the formation of CeO2 might be faster than that of SrCO3 in SrCeO3- based materials under CO2 atmosphere. Unfortunately, the chemical stability of SrCe0.95Y0.05O3 materials in CO2 atmosphere was reduced with increasing potassium-substituted amount. The microstructures of Sr1-xKxCe0.95Y0.05O3 sintered specimens were identified using field emission scanning electron microscope. The conductivity in moisture H-2 atmosphere (RH 30%) was increased with increasing potassium-substituted concentration. The conductivity reached a maximum of 0.0081 Scm(-1) at 900 degrees C for Sr0.95K0.05Ce0.95Y0.05O3 sintered specimens in moisture H-2 atmosphere (RH 30%). Potassium substituted for A-site of SrCe0.95Y0.05O3 could improve the conductivity but not CO2-resisted capability. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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收藏
页码：2948 / 2954
页数：7
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