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Microstructure and microwave dielectric properties of CaO-B_2O_3-SiO_2 glass ceramics with various B_2O_3 contents

韦鹏飞  周洪庆  朱海奎  戴斌  王杰  
【摘要】:The effects of B2O3 addition on both the sintering behavior and microwave dielectric properties of CaO-B2O3-SiO2 (CBS) glass ceramics were investigated by Fourier transform infrared spectroscopy (FTIR),X-ray diffractometry (XRD) and scanning electron microscopy (SEM).The results show that the increasing amount of B2O3 causes the increase of the contents of [BO3],[BO4] and [SiO4],which deduces the increase of CaB2O4 and α-SiO2 and the decrease of CaSiO3 correspondingly.No new phase is observed throughout the entire experiments.A bulk density of 2.54 g/cm3,a thermal expansion coefficient value of 11.95×10-6 °C -1 (20-500°C),a dielectric constant εr value of 6.42 and a dielectric loss tan δ value of 0.000 9 (measured at 9.7 GHz) are obtained for CBS glass ceramics containing 35% B2O3 (mass fraction) sintered at 850 °C for 15 min.

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