Abstract
Li4x Mg3(1−x)Al6(1−x)Ti5x O12 (x = 0.2, 0.4, 0.6, 0.8) ceramics were prepared by a solid state reaction method. The phase evolution, microstructure and composition of ceramics were investigated using X-ray powder diffractometer, scanning electron microscope, energy dispersive spectrometer. The microwave dielectric properties of ceramics were studied by a network analyzer. Both MgAl2O4 and Li4Ti5O12 have a cubic spinel structure, whereas no uniform solid solution was formed in Li4x Mg3(1−x)Al6(1−x)Ti5x O12 ceramics. There were Al-rich compounds and Ti-rich compounds in the mixed phases. With increasing x form 0.2 to 0.8, Al-rich compounds decreased and Ti-rich compounds increased. A complex phase evolution was appeared in the process, such as Mg2TiO4, Li2MgTi3O8 and Li4Ti5O12 compounds. With increasing x values, the sintering temperature was reduced from 1280 to 925 °C. Li4x Mg3(1−x)Al6(1−x)Ti5x O12 ceramics presented an excellent comprehensive performance with ε r of 11.5–26.5, Q × f values of 7102–30,191 GHz and τ f values of −55.4 ~ +5.7 ppm/ °C.
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Acknowledgments
This work was supported by Natural Science Foundation of China (Nos. 11464009 and 11364012), Natural Science Foundation of Guangxi (Nos. 2015GXNSFDA139033, 2014GXNSFAA118312, 2014GXNSFAA118326 and 2013GXNSFAA019291), Research Start-up Funds Doctor of Guilin University of Technology (Nos. 002401003281 and 002401003282) and Project of Outstanding Young Teachers’ Training in Higher Education Institutions of Guangxi.
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Zhou, H., Gong, J., Wang, N. et al. New microwave dielectric system of Li4x Mg3(1−x)Al6(1−x)Ti5x O12 with adjustable thermal stability and high quality factor. J Mater Sci: Mater Electron 27, 2557–2563 (2016). https://doi.org/10.1007/s10854-015-4058-0
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DOI: https://doi.org/10.1007/s10854-015-4058-0