期刊
PHYSICA B-CONDENSED MATTER
卷 456, 期 -, 页码 250-257出版社
ELSEVIER
DOI: 10.1016/j.physb.2014.08.036
关键词
LaInO3; Raman analysis; Ac conductivity; SEM
资金
- Department of Science and Technology (DST), New Delhi-India [SR/S2/CMP-0035/2011]
La(1-x)Ba(x)lnO(3-delta) system was synthesized to understand the phase formation and their relationship with conduction phenomena. Rietveld analysis has been performed to confirm the presence of crystalline phases. At room temperature, the system is a single phase up to x=0.05 with space group Pnma. However, higher concentration of dopant leads to formation of cubic and orthorhombic phases for x=0.1-0.15 samples. Raman spectra further verified Ba-substitution at La-site in lanthanum indate. Ac conductivity has been measured as a function of temperature and Ba content. The highest conductivity observed is similar to 3 mS cm(-1) for x=0.1 sample at 700 degrees C. The activation energy indicates that the nature of present samples is like oxide ion conductors and is almost invariant with increasing Ba-content. The thermal expansion coefficient (TEC) of present samples is in the order as required for SOFC applications. (C) 2014 Elsevier B.V. All rights reserved.
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