Microwave dielectric properties of Pb₂MoO₅ ceramic with ultra-low sintering temperature

Ultra-low firing microwave dielectric ceramic Pb₂MoO₅ with monoclinic structure was prepared via a conventional solid state reaction method. The sintering temperature ranged from 530°C to 650°C. The relative densities of the ceramic samples were about 97% when the sintering temperature was greater than 570°C. The best microwave dielectric properties were obtained in the ceramic sintered at 610°C for 2h with a permittivity ~19.1, a Q×f value about 21,960GHz (at 7.461GHz) and a temperature coefficient value of -60ppm/°C. From the X-ray diffraction, backscattered electron image results of the co-fired samples with 30wt% silver and aluminum additive, the Pb₂MoO₅ ceramics were found not to react with Ag and Al at 610°C for 4h. The microwave dielectric properties and ultra-low sintering temperature of Pb₂MoO₅ ceramic make it a promising candidate for low temperature co-fired ceramic applications.