Low temperature sintering and dielectric properties of Ba_0.6Sr_0.4TiO₃-MgO composite ceramics with CaO-B₂O₃-SiO₂ glass addition

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• 作者：Peng Gao ; Huiming Ji ; ^{jihuiming@tju.edu.cn} ; Qianqian Jia ; Xiaolei Li
• 关键词：Low temperature sintering ; CaO&ndash ; B2O3&ndash ; SiO2 glass ; BST&ndash ; MgO ; Dielectric properties
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：25 June, 2012
• 卷：527
• 期：Complete
• 页码：90-95
• 文件大小：1411 K

摘要

Self-made glass frits (calcium borosilicate glasses) were employed as the sintering aids to reduce the sintering temperatures of Ba_0.6Sr_0.4TiO₃ (for short BST)-MgO composite ceramics. The effects of CaO-B₂O₃-SiO₂ (for short CBS) glass on the sintering behavior, microstructures and dielectric properties of BST-MgO ceramics have been investigated. The pure BST-MgO ceramics usually sintered at above 1350 掳C. It was found in our experiment that 20 wt.%of CBS glass additives can reduce the sintering temperature to 850 掳C effectively. With increasing the content of CBS glasses, both of dielectric constant (蓻_r) and dielectric loss (tan 未) were decreased. The samples sintered at 850 掳C for 2 h with 20 wt.%CBS glass addition consist of Ca₄Ti₃O₁₀, Mg₂SiO₄, and BaCa₂Mg (SiO₄)₂ phases, and possess good dielectric properties: moderate dielectric constant 蓻_r = 66 and small dielectric loss tan 未 = 2.0 脳 10^鈭?.