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 B203 causes the increase of the contents of [BO3], [BO4] and [SiO4], which deduces the increase of CaB204 and a-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 ℃-1 （20-500℃）, a dielectric constant er value of 6.42 and a dielectric loss tanδ value of 0.000 9 （measured at 9.7 GHz） are obtained for CBS glass ceramics containing 35%-B203 （mass fraction） sintered at 850 ℃ for 15 min.
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.
基金
Project(2007AA03Z0455) supported by the National High-Technology Research and Development Program of China
Project(BE2009168) supported by the Natural Science Foundation of Jiangsu Province in China
Project supported by the Priority Academic Program Development of Jiangsu Higher Education Institution,China
