This study investigates the bulk density, sintering behaviour, and microwave dielectric properties of the MgO-2B2O3 series ceramics synthesised by solid-state reaction. According to the X-ray diffraction and microstructural analyses, the as-prepared MgO-2B2O3 ceramics possess a single-phase structure with a rod-like morphology. The effects of different quantities of H3BO3 and BaCu(B2O5) (BCB) on the bulk density, sintering behaviour, and microwave dielectric properties of the MgO-2B2O3 ceramics were investigated. Accordingly, the optimal sintering temperature was obtained by adding 30 wt% H3BO3 and 8 wt% BCB. We also reduced the sintering temperature to 825 °C. Furthermore, the addition of 40 wt% H3BO3 and 4 wt% BCB increased the quality factor, permittivity, and temperature coefficient of resonance frequency of MgO-2B2O3 to 44,306 GHz (at 15 GHz), 5.1, and −32 ppm/°C, respectively. These properties make MgO-2B2O3 a viable low-temperature co-fired ceramic with broad applications in microwave dielectrics.
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This work was supported by the National Natural Science Foundation of China (Nos. 61761015 and 12064007), the Natural Science Foundation of Guangxi (Nos. 2018GXNSFFA050001, 2017GXNSFDA198027, and 2017GXNSFFA198011), High Level Innovation Team and Outstanding Scholar Program of Guangxi Institutes. References
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Wang, H., Li, S., Wang, K. et al. Sintering behaviour and microwave dielectric properties of MgO-2B2O3-xwt%BaCu(B2O5)-ywt%H3BO3 ceramics. J Adv Ceram (2021). https://doi.org/10.1007/s40145-021-0503-0
- low-temperature co-fired ceramics (LTCC)
- sintering temperature
- microwave dielectrics
- temperature coefficient of resonance frequency