ZBAS on the Structure and Dielectric Property of BaAl2Si2O8

doi:10.15541/jim20170509

Abstract

Abstract:

Barium feldspar BaO-Al₂O₃-SiO₂ system materials have been studied widely for satellite communication, microwave substrate and packaging in recent years. BaAl₂Si₂O₈-x(ZnO-Al₂O₃-SiO₂-B₂O₃) (x=0, 1%, 2%, 3%, 4%) ceramics were prepared by solid state route. The effects of ZBAS glass on the sintering behaviour, phase composition and microwave dielectric properties of BaAl₂Si₂O₈ were investigated. Addition of ZBAS glass can effectirely lower the sintering temperature to 1360℃ without changing phase composition of the sample and greatly propel the transition from hexacelisian to celsian. When x≥2%, the transition from hexacelisian to celsian reaches 100%. Density, dielectric constant and τ_f of BaAl₂Si₂O₈-ZBAS ceramics increase with the increment of ZBAS glass in the range of 1%≤x≤4%. In addition, the resonant frequency temperature coefficient is negative. The BaAl₂Si₂O₈-ZBAS sintered at 1360℃ obtains a high Q×f of 28058 GHz, ε_r=6.72 and τ_f=-29.79×10^-⁶℃^-¹ at x=3%. Deviations between experimental and theoretical relative permittivity of BaAl₂Si₂O₈-xZBAS is also discussed.

Key words: ZBAS glass, feldspar, celsian, microwave dielectric properties.

CLC Number:

TQ174

HAN Lin-Cai, DING Shi-Hua, SONG Tian-Xiu, HUANG Long, ZHANG Xiao-Yun, XIONG Zhong. ZBAS on the Structure and Dielectric Property of BaAl₂Si₂O₈[J]. Journal of Inorganic Materials, 2018, 33(8): 883-888.

Figures/Tables 6

Fig. 1 Relationship between density and sintering temperature for the sample with different amount of ZBAS (a) and the density curve in respond to ZBAS amount for the samples sintered at optimum temperatures (b)

Fig. 2 XRD patterns of the BAS samples with different glass phase amounts

Fig. 3 SEM images of the samples with different ZBAS amounts

Fig. 4 Dielectric constant of the samples with different ZBAS amounts

Fig. 5 Q×f of the samples with different ZBAS amounts

Fig. 6 τf of the samples with different ZBAS amounts

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ZBAS on the Structure and Dielectric Property of BaAl₂Si₂O₈

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