A reduced sintering temperature and improvement in the microwave dielectric properties of Li₂Mg₃TiO₆ through Ge substitution
Xiang, Huaicheng; Li, Chunchun; Yin, Changzhi; Tang, Ying; Fang, Liang (2017-12-24)
Huaicheng Xiang, Chunchun Li, Changzhi Yin, Ying Tang, Liang Fang, A reduced sintering temperature and improvement in the microwave dielectric properties of Li2Mg3TiO6 through Ge substitution, Ceramics International, Volume 44, Issue 5, 2018, Pages 5817-5821, ISSN 0272-8842, https://doi.org/10.1016/j.ceramint.2017.12.167
© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2018042318379
Tiivistelmä
Abstract
In this paper, we demonstrate a strategy to reduce the sintering temperature of titanates through an appropriate amount of Ge substitution for Ti. A series of Li₂Mg₃Ti1-xGexO₆ (x = 0.04, 0.06, 0.08, 0.10, 0.12) ceramics, prepared by a solid-state reaction method, are reported. By controlling the content of the Ge substitution, the sintering temperature of Li₂Mg₃TiO₆ was significantly reduced to 1140 °C. When x = 0.10, the Li₂Mg₃Ti1-xGexO₆ ceramics sintered at 1140 °C for 6 h displayed excellent values of εr = 13.7, Q × f = 131,500 GHz and τf = −34.2 ppm/°C. In addition, the temperature stability was successfully adjusted to be close to zero by adding CaTiO₃ to form a composite ceramic. A temperature stable ceramic 0.96Li₂Mg₃Ti0.9Ge0.1O₆-0.04CaTiO₃ with τf = −3.5 ppm/°C, εr = 14.9 and Q × f = 68,900 GHz was obtained when sintered at 1180 °C. The good dielectric performances of the CaTiO₃-modified Li₂Mg₃Ti0.9Ge0.1O₆ ceramics makes them possible candidates for substrates in microwave integrated circuits.
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