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

摘要

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 Inc. Scanning electron microscopy results revealed dense and homogeneous microstructure of La(2)a(3)(MoO4)(9) ceramics as sintered in the temperature range of 725-800 degrees C. The La2Zr3(MoO4)(9) ceramic sintered at 775 degrees C for 4 h possessed excellent microwave dielectric properties of relative permittivity epsilon(r) similar to 10.8, quality factor Qxf similar to 50,628 GHz (at 10.45 GHz), and temperature coefficient of the resonant frequency tau(f) similar to -38.8 ppm/degrees C, showing great potentials for applications of low temperature co-fired ceramic technology.