Abstract A self-composite ceramic of Li4MgSn2O7 (L4MS) and Li2Mg3SnO6 (L2MS) phases with compositions Li2/3(1-x)Sn1/3(1-x)MgxO (x = 1/6)-y wt.%LiF was for the first time prepared by a conventional solid-state reaction method. The XRD results indicate that L4MS and L2MS((MgO)ss) phases can stably coexist only as sintering temperature is below 1200 °C, and their relative contents can be regulated by changing sintering temperature. The sintering aid LiF was used to not only reduce sintering temperature to suppress the L4MS decomposition, but also obtain the dense ceramic body. Excellent microwave dielectric properties of er = 13.4, Qxf = 123,440 GHz and near-zero τf ∼ −4.3 ppm/°C were obtained in the y = 5 sample sintered at 1000 °C for 6 h. For LTCC applications, both good chemical compatibility with Ag and optimum microwave dielectric properties of er = 13.0, Qxf = 78,180 GHz and τf = −9 ppm/°C were achieved in the sample with y = 6 as sintered at 850 °C, showing great application potentials in future microwave devices.

中文翻译：

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用于 LTCC 应用的 Li4MgSn2O7–Li2Mg3SnO6 超低损耗和温度稳定自复合微波介电陶瓷

摘要 组成为 Li2/3(1-x)Sn1/3(1-x)MgxO (x = 1/6)-y wt.%LiF 的 Li4MgSn2O7 (L4MS) 和 Li2Mg3SnO6 (L2MS) 相的自复合陶瓷是首次采用常规固相反应法制备。XRD结果表明，L4MS和L2MS((MgO)ss)相只有在烧结温度低于1200℃时才能稳定共存，并且它们的相对含量可以通过改变烧结温度来调节。烧结助剂LiF不仅用于降低烧结温度以抑制L4MS分解，而且获得致密的陶瓷体。在 y = 5 样品中，在 1000 °C 下烧结 6 小时，获得了 er = 13.4、Qxf = 123,440 GHz 和接近零的 τf ∼ -4.3 ppm/°C 的优异微波介电性能。对于 LTCC 应用，