Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 555, Issue -, Pages 395-401Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.10.195
Keywords
Barium stannate; Proton conduction; Electrical property; Thermal expansion coefficient
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Funding
- National Natural Science Foundation of China [51102216, 51172120]
- Program for the Innovative Talents of Higher Learning Institutions of Shanxi
- Natural Science Foundation for Young Scientists of Shanxi Province [2012021021-1]
- Shanxi Scholarship Council of China [2012-071]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars of Shanxi Province
- State Key Laboratory for Mechanical Behavior of Materials [20111205]
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In this study, the synthesis, structural and electrical properties of BaSn0.75M0.25O3-delta (M = Fe, Sc, In, Y, Gd, Sm, Nd and La) compounds have been investigated. Single phase powders of these materials were successfully synthesized by a gel polymerization route and sintered to obtain dense pellets. X-ray diffraction reveals that all compounds crystallise in a cubic perovskite like-structure (space group: Pm (3) over barm) at room temperature. However, cell parameters of the substituted compounds do not evolve in accordance with the substituent radius, i.e. an abnormal drop was observed for elements with a large radius, i.e. Sm, Nd and La. A possible interpretation could be the partial incorporation of substituents into the Ba-site. The site incorporation selectivity of substituents into the Ba- and Sn-sites was investigated based on the study of lattice parameters and empirical defect models. Experiments show that the thermal expansion coefficients and electrical properties have no specific correlation with the nature of the substituent. (C) 2012 Elsevier B.V. All rights reserved.
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