A new Li0.5Sm0.5WO4 low temperature firing microwave dielectric ceramic

Present work introduces a new kind of low temperature sintering microwave dielectric ceramic of Li0.5Sm0.5WO4. Li0.5Sm0.5WO4 ceramic can be prepared by the solid-state reaction method and be well densified in the temperature range from 750 °C to 850 °C for 0.5-6 h in air. The compound crystallizes in the single-phase tetragonal system (I41/a) with unit cell parameter a = 5.22211(9) Å, c = 11.3220(9) Å, V = 308.6(5) Å3 and Z = 4. The best microwave dielectric properties can be obtained in ceramic sintered at 800 °C for 2 h with permittivity about 17.0, Q × f about 5792 GHz and TCF about 86.7 ppm/°C. The additions of Li0.5Sm0.5WO4 not only can reduce the sintering temperature, but also can adjust the TCF values of ZnWO4 to near-zero.