Grain boundary segregation and microwave dielectric properties of low loss Mg_1·5Zn_0·5SiO₄ ceramics containing Bi₂O₃

S T LeeDepartment of Materials Science and Engineering, Yonsei University, Seoul120-749, Korea

Y H JoDepartment of Materials Science and Engineering, Yonsei University, Seoul120-749, Korea

H E KimDepartment of Materials Science and Engineering, Yonsei University, Seoul120-749, Korea

D H YounDepartment of Materials Science and Engineering, Yonsei University, Seoul120-749, Korea

I J ChoiDepartment of Materials Science and Engineering, Yonsei University, Seoul120-749, Korea

S H KeyDepartment of Materials Science and Engineering, Yonsei University, Seoul120-749, Korea

C-Y KangThin Film Materials Research Center, Korea Institute of Science and Technology, Seoul 130-650, Korea 3Division of Human Environmental Sciences, Sangmyung University, Seoul110-743, Korea

W S HongThin Film Materials Research Center, Korea Institute of Science and Technology, Seoul 130-650, Korea 3Division of Human Environmental Sciences, Sangmyung University, Seoul110-743, Korea

Y S ChoDepartment of Materials Science and Engineering, Yonsei University, Seoul120-749, Korea

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Abstract

Abstract

Uncommon low loss Mg_1·5Zn_0·5SiO₄ ceramics containing Bi₂O₃ were investigated by focusing on the roles of Bi₂O₃ on phase evolution and resultant microwave dielectric properties. While the primary goal of lowering sintering temperature can be easily assumed, some unexpected behaviours of the Bi₂O₃ containing materials are highlighted with experimental evidences concerning selective dissolution of Zn₂SiO₄ and grain boundary segregation of gradual Bi richer phases. These evidences are strongly dependent on the content of Bi₂O₃ and sintering temperature. As an optimal composition, Mg_1·5Zn_0·5SiO₄ with 0·5 mol.-%Bi₂O₃ exhibited promising dielectric properties of a k value ∼6·8 and a Q×f value ∼23 300 at a sintering temperature of 1150°C, which is much lower than typical sintering temperature of 1450°C.

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Grain boundary segregation and microwave dielectric properties of low loss Mg_1·5Zn_0·5SiO₄ ceramics containing Bi₂O₃

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Grain boundary segregation and microwave dielectric properties of low loss Mg_1·5Zn_0·5SiO₄ ceramics containing Bi₂O₃