Abstract
Microstructure and microwave dielectric properties of (1-x)Li2Mg3TiO6-xCa0.8Sr0.2TiO3 (x = 0.03, 0.06, 0.08, 0.09, 0.12) ceramics prepared by the conventional solid state route have been investigated. XRD and SEM-EDS analysis confirmed that ceramics contain Li2Mg3TiO6 and Ca0.8Sr0.2TiO3 phases. The microwave properties exhibited a significant dependence on the sintering temperature and Ca0.8Sr0.2TiO3 content. With increasing addition of Ca0.8Sr0.2TiO3, the dielectric constant \(({\varepsilon _r})\) increased from 14.3 to 17.4 when samples sintered at 1410 °C for 4 h; the quality factor (Q × f) decreased from 133,905 to 101,000 GHz, and the temperature coefficient of resonant frequency (\({\tau _f}\)) significantly increased from −39 to 6.35 ppm/°C when samples sintered at 1370 °C for 4 h. Sample with 0.91Li2Mg3TiO6-0.09Ca0.8Sr0.2TiO3 sintered at 1370 °C for 4 h possess excellent microwave properties with \({\varepsilon _r}\) of 16.4, a Q × f of 113,000 GHz and \({\tau _f}\) of −3.65 ppm/°C. It is proposed as low-loss and low-cost dielectric materials for microwave and millimeter wave application.
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Acknowledgements
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. The authors would like to express thanks to Ruan YinJie for the support in XRD test and Rong Jian for their technical support. The author also expresses his gratitude to the support from the Special glass and microwave dielectric ceramics group.
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Xie, T., Zhang, L., Ren, H. et al. A novel temperature-stable and low-loss microwave dielectric using Ca0.8Sr0.2TiO3- modified Li2Mg3TiO6 ceramics. J Mater Sci: Mater Electron 28, 13705–13709 (2017). https://doi.org/10.1007/s10854-017-7214-x
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DOI: https://doi.org/10.1007/s10854-017-7214-x