溶胶包裹钛酸钡陶瓷的制备及介电性能研究  

PREPARATION AND ELECTRICAL PROPERTIES OF SOLCOATED BaTiO_3 CERAMICS

作　　者：方立明[1] 邵义[1] 张帆[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《中国陶瓷工业》2009年第6期6-9,共4页China Ceramic Industry

摘　　要：采用溶胶-凝胶法,以钛酸四丁酯、乙酸钡和乙醇为原料,分别以Fe(NO3)·39H2O和La(NO3)·36H2O为Fe3+和La3+源制备掺杂BaTiO3溶胶,用(Ba0.97La0.02)(Ti0.97Fe0.04)O3溶胶包裹BaTiO3纳米粉体,采用不同的烧结工艺制备了溶胶包裹BaTiO3陶瓷。用XRD、SEM等手段对组成和微观结构进行分析,用LCR测深仪测试陶瓷的介电性能。1kHz测试频率下,用(Ba0.97La0.02)(Ti0.97Fe0.04)O3溶胶包裹BaTiO3纳米粉体,可以在1260℃烧结温度下获得高致密的BaTiO3陶瓷,获得了最大介电系数为3610,容量变化率约为7%,介电损耗值范围在2.1%～3%之间的掺杂BaTiO3陶瓷。Using Fe（NO3）3·9H2O and La（NO3）3·6H2O as doping agents respectively, La3＋ and Fe3＋ were doped on the A or B site of BaTiO3 in the type of Ba （Ti1-xFex）O3 and （Ba1-3xLa2x）（Ti1-3xFe4x）O3, and the composites were prepared by the Sol-gel method. BaTiO3 powders were coated by （Ba0.97La0.02）（Ti0.97Fe0.04）O3 Sol, and solcoated BaTiO3 ceramics were prepared through a subsequent different sintering process. Moreover, XRD and SEM were used to analyze the composition and microstructure. For coated specimens, when the mole rate of （Ba0.97La0.02） （Ti0.97Fe0.04）03 and BaTi03 is 3/2, has a maximum value of 3610 at 60℃, with low temperature coefficient capacitance of 7%, and low dielectric dissipation fraction between 2.1% and 3%, under 1kHz test conditions.

关 键 词：BATIO3 Fe3+/La3+共同掺杂 溶胶包裹 介电性能 

分 类 号：TQ174.758[化学工程—陶瓷工业]