Study on structure, microstructure and microwave dielectric characteristics of CaV2O6 and (Ca0.95M0.05)V2O6 (M=Zn, Ba) ceramics

In this study, the (Ca0.95M0.05)V2O6 (M = Zn, Ba) and the CaV2O6 ceramics were synthesized through a solid-state reaction method, and the effects of Zn2+ and Ba2+ substitution on the structure, sintering temperature, densification, microstructure and microwave dielectric properties of CaV2O6 ceramic were analysed. The XRD patterns of the sintered samples indicated a single-phase of CaV2O6 in all temperatures. Substitution of Zn2+ caused a lower sintering temperature and improved the densification of the CaV2O6 ceramic. While the dielectric properties of the (Ca(0.95)Ba0(.05))V2O6 compound were not desirable, the (Ca0.95Zn0.05)V2O6 sample sintered at 650 degrees C for 4hours showed significant dielectric properties, with epsilon(r)=10.29, Qxf similar to 53000GHz (at 15.5GHz) and tau(f)=-72.37ppm/degrees C. Moreover, the chemical compatibility of the CaV2O6 ceramic with Al electrode was examined.