Sintering behavior and dielectric properties of Ce doped strontium barium niobate ceramics with silica sintering additive

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• 作者：Lili Wang^a ; Wanmei Sui^a ; ^{Suiwm@hotmail.com} ; Shijun Luan^a ; Ranran Song^a ; Jinshan Tan^b
• 关键词：Ceramics ; Sintering ; Microstructure ; Dielectric properties
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：15 May, 2012
• 卷：134
• 期：1
• 页码：531-535
• 文件大小：870 K

摘要

Sr_0.5Ba_0.5Nb₂O₆ ceramics with and without CeO₂ dopant were prepared by a partial co-precipitation method and a liquid phase sintering process. The cooperative effects of Ce doping and silica sintering additive on the sintering behaviors and the dielectric properties of Sr_0.5Ba_0.5Nb₂O₆ ceramics was investigated. It was observed that the lattice parameters of a-axis and c-axis of Sr_0.5Ba_0.5Nb₂O₆ ceramics decrease with the increase of Ce dopant, namely contraction of crystal cell volume occurs. Amorphous silica used for sintering additive can effectively restrain abnormal grain growth and prevent the rise of sintering activation energies caused by Ce doping, but Ce doping has more effect on the average size of the grains and the dielectric properties than the silica sintering additive when the Ce dopant and the silica sintering additive are introduced. Both the Curie temperatures and the maximum of dielectric constant at Tc decrease as the Ce³⁺ concentration increases.