Dense ceramic samples in the (1-x) BiVO4-xLi(0.5)Sm(0.5)WO(4) (0.05 a parts per thousand currency sign x a parts per thousand currency sign 0.1) system are prepared using the solid-state reaction process. A single solid-solution phase with monoclinic structure formed through the entire compositions and the unit cell volume increases linearly with x. When x = 0.07, the composition of 0.93BiVO(4)-0.07 Li0.5Sm0.5WO4 readily sintered at 750 A degrees C has excellent microwave properties with a high permittivity of 73.9, and a Q x f value of 9054 GHz and a near-zero temperature coefficient of -1.61 ppm/A degrees C. The ceramics have applications for microwave devices requiring ultra-low sintering temperatures.