Abstract
Rock salt structured Li4WO5 ceramics were prepared by the reaction sintering method. Without calcination, a mixture of Li2CO3 and WO3 were sintered directly. XRD shows that a single orthorhombic Li4WO5 phase was obtained throughout the sintering temperature range 870–910 °C. Dense ceramic with a high relative density ~ 94.2% was achieved through reaction sintering at 880 °C. Excellent microwave properties with ε r = 9.1, Q × f = 43,000 GHz, and τ f = − 3 ppm/°C were obtained. In contrast with the conventionally sintered ceramics, it should be noted that the reaction sintered samples have a higher permittivity and quality factor. These results show that the reaction sintering can enhance the densification of Li4WO5, which in turn would improve the dielectric performances.
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Acknowledgements
This work was supported by Natural Science Foundation of China (Nos. 51502047, 21561008, and 21761008), the Natural Science Foundation of Guangxi Zhuang Autonomous Region (Nos. 2015GXNSFFA139003, 2016GXNSFBA380134, and 2016GXNSFAA380018), Project of Scientific Research and Technical Exploitation Program of Guilin (2016010702-2, 20170225), and Innovation Project of Guangxi Graduate Education (YCBZ2017052). Chunchun Li gratefully acknowledges the Guangxi Scholarship Fund of Guangxi Education Department.
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Xiao, K., Li, C., Xiang, H. et al. Reaction sintering of a rock salt structured Li4WO5 ceramic and its microwave dielectric properties. J Mater Sci: Mater Electron 29, 6397–6402 (2018). https://doi.org/10.1007/s10854-018-8619-x
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DOI: https://doi.org/10.1007/s10854-018-8619-x