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《Electronic Components and Materials》 2010-01
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Preparation and properties of Y~(3+)-doped (Ba, Sr, Ca)TiO_3 nanopowders and fine-grained ceramics

DU Fengtao1,CHENG Hualei1,CUI Bin1,CHANG Zhuguo1,YANG Aiwu2(1.Shaanxi Key Laboratory of Physico-Inorganic Chemistry,Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education,School of Chemistry and Materials Science,Northwest University,Xi’an 710069,China;2.Xi’an North Qinghua Mechanical and Electrical Group Co.,Ltd,Xi’an 710025,China)  
Y3+-doped Ba0.90Sr0.08Ca0.02TiO3(BSCT) nanopowders and fine-grained ceramics were prepared via a sol-gel method.The structure and morphology of samples were characterized by TG-DTG,XRD,SEM and TEM,and the dielectric properties of prepared ceramics were also measured.The results show that the prepared nanopowders were mainly composed of cubic BaTiO3 phase.The grain size of prepared ceramics can be controlled between 0.68 μm and 2.24 μm.The grain growth of prepared ceramics can be inhibited and Curie temperature shifts to lower temperature.A relatively flat εr-t curve is obtained when the Y3+-doping amount increases.εr of the ceramics at room temperature increases greatly to 9 176 when the x(Y3+) is 7.0%.
【Fund】: 陕西省教育厅2009年度科学研究计划资助项目(No.09JC01);; 陕西省“13115”科技创新工程重大科技专项资助(No.2007ZDKG—61);; 西北大学研究生交叉学科资助项目(No.07YJC07)
【CateGory Index】: TQ174.1
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