Structure, infrared reflectivity spectra and microwave dielectric properties of a low-firing microwave dielectric ceramic Pr2Zr3(MoO4)(9)

摘要

Pr2Zr3(MoO4)(9) ceramics were prepared by solid state reaction method and the microwave dielectric properties were investigated for the first time. Single-phase Pr2Zr3(MoO4)(9) ceramics with a space group R-3c were obtained in the whole sintering temperature range (600-800 degrees C) confirmed by X-ray diffraction (XRD) and Rietveld refinement. SEM images combined with high relative density (95.7%) suggested that well-densed Pr2Zr3(MoO4)(9) ceramic could formed at low sintering temperature 650 degrees C. The intrinsic factors affecting dielectric properties were analyzed according to chemical bonds theory of complex crystals and infrared spectra. Typically, the novel microwave dielectric ceramic Pr2Zr3(MoO4)(9) sintered at 650 degrees C exhibited desirable dielectric properties combination: epsilon(r) = 10.72, Q.f = 64,200 GHz (at 9.6 GHz) and tau(f) = -13.0 ppm/degrees C. (C) 2020 Elsevier B.V. All rights reserved.