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《Journal of Functional Materials》 2007-03
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Preparation and dielectric characterization of Ba_(1-x)Sr_xTiO_3 ceramics by sol-gel technique

WANG Jiang-ying1,YAO Xi2(1.College of Sciences,China Jiliang University,Hangzhou 310018,China;2.Functional Materials Research Laboratory,Tongji University,Shanghai 200092,China)  
The Ba1-xSrxTiO3(BST) ceramics of various compositions were prepared by sol-gel-derived powders.The microstructure and dielectric properties of Ba1-xSrxTiO3 ceramics with X from 0.3 to 0.5 have been investigated.Experimental results showed that the synthetic temperature of Ba1-xSrxTiO3 powder is 700℃,which is much lower than that by the conventional solid-state reaction method.The Ba0.60Sr0.40TiO3 powder obtained is a cubical phase.The typical cubic phase structure with x≥0.4 and tetragonal phase structure with x0.4 in the XRD pattern of the Ba1-xSrxTiO3 ceramics sintered at 1573K.The sintering temperature of the Ba0.60Sr0.40TiO3 powder falls to 1250℃.Sr acts as substitution to replace Ba in the A site of ABO3 perovskite structure,leading to a shift of Curie temperature(Tc) to lower temperature with increasing Sr content.The correlation of Curie temperature(Tc) dependence of Sr content(x) for the Ba1-xSrxTiO3 ceramics can be expressed as Tc=394.1-272.6x(K).
【Fund】: 国家重点基础研究发展计划(973计划)资助项目(2002CB613304)
【CateGory Index】: TM282
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