Abstract
Novel low-fired Li4Mg2NbO6F ceramics were synthesised using a conventional solid-state reaction method. X-ray diffraction and Rietveld refinement confirmed that the Li4Mg2NbO6F compound had a face-centred-cubic rock salt structure [Fm-3 m(225)] above 625 °C. Li4Mg2NbO6F ceramics sintered between 875 °C and 950 °C displayed the optimised density (> 97.5 %). The theoretical εtheo was calculated based on the refined crystal parameters, closing to the measured εr. The ceramic sintered at 900 °C exhibited excellent microwave dielectric properties with εr of 15.53 ± 0.03, Q × f value of 93,300 ± 1100 GHz (at 7.7 GHz) and τf value of −39.8 ± 0.8 ppm/°C. The compatibility with Ag powders makes the oxyfluoride a potential candidate for LTCC applications.
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