Series of thermally stable Li1+2x Mg4−x V3O12 ceramics: low temperature sintering characteristic, crystal structure and microwave dielectric properties

Abstract

Series of novel low-firing microwave dielectric ceramics with the composition of Li1+2x Mg4−x V3O12 (−0.2 ≤ x ≤ 0.1) were prepared by a solid-state reaction process. The crystal structure, sintering behavior and microwave dielectric properties of ceramics were investigated using X-ray diffraction, scanning electron microscopy and dielectric measurement. As x increased from −0.2 to 0.1, the optimized sintering temperature was reduced from 880 to 700 °C, the quality factors (Q × f) were effectively enhanced from 21,000 to 33,200 GHz. A good combined microwave dielectric properties with er = 12.1, Q × f = 21,800 GHz, τ f = 1.8 ppm/°C were obtained for x = −0.1.