Abstract
Ca3-xMg1+xLiV3O12 (0 ≤ x ≤ 1) ceramics with cubic-garnet-structure were synthesized by the solid-phase reaction. The replacement of Ca2+ with the smaller Mg2+ exerted an increasingly strong “rattling” effect at the A-site of Ca3-xMg1+xLiV3O12. With increased Mg2+, εr increased from 10.5 ± 0.1 to 15.4 ± 0.1 and εcorr increased from 11.0 ± 0.1 to 16.0 ± 0.1, whereas the theoretical εth decreased from 12.0 ± 0.1 to 10.5 ± 0.1. εcorr was higher than εth due to the “rattling” effect. The enhanced “rattling” effect caused τf to increase rapidly from –64.1 ± 1.0 ppm/°C to +267.2 ± 1.0 ppm/°C. With increased x, Q × f decreased from 74,700 ± 500 GHz to 15,370 ± 500 GHz, due to the decreased packing fraction, increased FWHM of the A1g modes, and enhanced “rattling” effect. Additionally, the chemical compatibility between Ca2.75Mg1.25LiV3O12 and Ag electrodes was confirmed, indicating this material’s potential for LTCC.
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