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

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Title:	Effect of potassium substituted for A-site of SrCe0.95Y0.05O3 on microstructure, conductivity and chemical stability
Authors:	李雄;Liu, Chi;Huang, Jian-Jia;Fu, Yen-Pei;Li, Chuan;Wang, Jian-Yih;Lee, Shyong
Contributors:	工學院機械工程學系
Keywords:	Atmospheres;Carbon dioxide;Ceramics;Conductivity;Corrosion resistance;Defects;Electrical properties;Microstructure;Potassium;Resistivity;Sintering;X-ray diffraction
Date:	2015-01-01
Issue Date:	2026-04-23 15:02:22 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： The chemical stability of potassium substituted for A-site of SrCe0.95Y0.05O3 specimens was examined under CO2 atmosphere treated at 600°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°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 H2 atmosphere (RH 30%) was increased with increasing potassium-substituted concentration. The conductivity reached a maximum of 0.0081 Scm-1 at 900°C for Sr0.95K0.05Ce0.95Y0.05O3 sintered specimens in moisture H2 atmosphere (RH 30%). Potassium substituted for A-site of SrCe0.95Y0.05O3 could improve the conductivity but not CO2-resisted capability. 出版者： Elsevier Ltd 出版日期： 2015-03-01 出處： Ceramics international, 2015-03, Vol.41 (2), p.2948-2954 版權： 2014 Elsevier Ltd and Techna Group S.r.l. 識別號： ISSN: 0272-8842 識別號： EISSN: 1873-3956 識別號： DOI: 10.1016/j.ceramint.2014.10.126
Appears in Collections:	[Departmant of Mechanical Engineering ] journal & Dissertation

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