Microwave dielectric properties of glass-Bi₂Ti₂O7 ceramic composites
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The microwave dielectric properties of glass-Bi₂Ti₂O7 ceramic composites were investigated. Using bismuth-zinc borosilicate (BZBS) glass and TiO₂, glass-Bi₂Ti₂O7 composites were prepared by liquid phase sintering. The linear shrinkage exhibited a two-stage sintering behavior; viscous flow of the liquid phase and then crystallization. The crystalline phases of Bi₂Ti₄O₁₁and Bi₂Ti₂O7 were observed at 700 and 900oC, respectively. The dielectric constant (εr) and the quality factor (Q×f0) were affected by the formation of crystalline phases as well as the density. For the specimen sintered at 900oC, the dielectric constant, the quality factor and the temperature coefficient of the resonant frequency (τf) was respectively 56.4, 518 GHz (105 at 4.898 GHz), and +119 ppm/K.
Abstract
The microwave dielectric properties of glass-Bi₂Ti₂O7 ceramic composites were investigated. Using bismuth-zinc borosilicate (BZBS) glass and TiO₂, glass-Bi₂Ti₂O7 composites were prepared by liquid phase sintering. The linear shrinkage exhibited a two-stage sintering behavior; viscous flow of the liquid phase and then crystallization. The crystalline phases of Bi₂Ti₄O₁₁and Bi₂Ti₂O7 were observed at 700 and 900oC, respectively. The dielectric constant (εr) and the quality factor (Q×f0) were affected by the formation of crystalline phases as well as the density. For the specimen sintered at 900oC, the dielectric constant, the quality factor and the temperature coefficient of the resonant frequency (τf) was respectively 56.4, 518 GHz (105 at 4.898 GHz), and +119 ppm/K.
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