Sintering behavior, microstructure and microwave dielectric properties of Li2MgTi3O8 ceramics modified by LiF have been studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), thermal dilatometry and with a network analyzer at the frequency of about 6–10 GHz. The addition of LiF to Li2MgTi3O8 led to the formation of trace amounts of MgF2(ss), and Li2TiO3(ss) secondary phases, which reduced the sintering temperature to 850 °C without affecting its microwave dielectric properties. In contrast, the LiF-doped composition exhibited single phase solid solution with ordered spinel structure after sintering at 900 °C/2 h, and MgTi2O5 secondary phase appeared after sintering at 1100 °C/2 h. An excellent combined microwave dielectric properties with ε r of ~27.8, Q × f of ~63,000 GHz and τ f of ~−4.1 ppm/°C could be obtained for the LiF-added composition with x = 0.15 sintered at 850 °C/2 h. The x = 0.15 composition was chemically compatible with Ag powders after sintering at 850 °C for 2 h.
Journal of Materials Science: Materials in Electronics – Springer Journals
Published: May 10, 2017
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