Microstructure and Microwave Dielectric Properties of Low-Temperature Sintering Ca_5−yLi_2yNi₄(VO₄)₆ Ceramics

Abstract

The influence of sintering temperature and the quantity of lithium content on microstructure and microwave dielectric properties of the Ca5−yLi2yNi4(VO4)6 were investigated. All samples were fabricated by the solid-state reaction method with a sintering temperature of 935 °C–995 °C for 4 h. The results showed no second phases formed from the XRD pattern in all samples and dense surface morphology with a sintering temperature of 965 °C. For specimens with y = 0.10 sintered at 965 °C, the permittivity, quality factor (Qf), and temperature coefficient of resonant frequency (τ f ) were 9.7, 25,000 GHz –52 ppm/°C, respectively. Thus, these modified dielectric materials possess a high potential for applications in low-temperature co-fired ceramic.