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

Authors: Lee, S T; Jo, Y H; Kim, H E; Youn, D H; Choi, I J; Key, S H; Kang, C-Y; Hong, W S; Cho, Y S

Source: Advances in Applied Ceramics, Volume 109, Number 6, August 2010 , pp. 367-372(6)

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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.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.

Keywords: Microwave dielectric; Glass?ceramic; Densification; Titanates

Document Type: Original Article

DOI: http://dx.doi.org/10.1179/174367609X455995

Publication date: 2010-08-01

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