A novel low-temperature firable La2Zr3(MoO4)9 microwave dielectric ceramic

A novel low-temperature fired La2Zr3(MoO4)9 microwave dielectric ceramic was successfully fabricated by a conventional solid-state reaction method. The powder compact was densified in air in the temperature range of 700-800 °C for 4 h. X-ray diffraction analysis indicated that all studied samples presented a single phase structure. Rietveld refinement results further confirmed that La2Zr3(MoO4)9 belonged to a trigonal system with space group R3¯c. Scanning electron microscopy results revealed dense and homogeneous microstructure of La2Zr3(MoO4)9 ceramics as sintered in the temperature range of 725-800 °C. The La2Zr3(MoO4)9 ceramic sintered at 775 °C for 4 h possessed excellent microwave dielectric properties of relative permittivity εr ∼ 10.8, quality factor Qxf ∼ 50,628 GHz (at 10.45 GHz), and temperature coefficient of the resonant frequency τf ∼ −38.8 ppm/°C, showing great potentials for applications of low temperature co-fired ceramic technology.