Abstract
Li6MgTiNb1−xVxO8F (0 ≤ x ≤ 0.08) ceramics were prepared using a solid-state reaction. The correlations between their sintering characteristics and the microwave dielectric performance as functions of V5+ substitution and sintering temperature were investigated systematically. Rietveld refinements of the X-ray diffraction data showed that all the samples had a cubic rock-salt structure. The Li6MgTiNbO8F ceramic sintered at 1175 °C exhibited an attractive Q × f value of 105,700 ± 1600 GHz. The substitution of V5+ for Nb5+ decreased the sintering temperature while improving the relative density and relative permittivity. The V-beared Li6MgTiNb0.98V0.02O8F ceramic sintered at 850 °C showed outstanding dielectric properties of εr = 18.14 ± 0.05, Q × f = 58,300 ± 1300 GHz, and τf = −42.66 ± 0.33 ppm/°C. Good chemical compatibility with Ag electrodes highlighted the potential of the ceramic in low-temperature co-fired ceramic applications.
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