Microstructure and microwave dielectric properties of CaO-B2O3-SiO2 glass ceramics with various B2O3 contents |
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| Authors: | Peng-fei Wei Hong-qing Zhou Hai-kui Zhu Bin Dai Jie Wang |
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| Affiliation: | (1) State Key Laboratory Breeding Base of Nonferrous metals and Specific Materials Processing, Guilin University of Technology, 541004 Guilin, People’s Republic of China;(2) Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, 541004 Guilin, People’s Republic of China |
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| Abstract: | 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 ɛ r 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% B2O3 (mass fraction) sintered at 850 °C for 15 min. |
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| Keywords: | CaO-B2O3-SiO2 B2O3 content Fourier transform infrared spectroscopy microstructure dielectric properties |
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