Study on structure, microstructure and microwave dielectric characteristics of CaV 2 O 6 and (Ca 0.95 M 0.05 )V 2 O 6 (M=Zn, Ba) ceramics

Abstract In this study, the (Ca 0.95 M 0.05 )V 2 O 6 (M = Zn, Ba) and the CaV 2 O 6 ceramics were synthesized through a solid‐state reaction method, and the effects of Zn 2+ and Ba 2+ substitution on the structure, sintering temperature, densification, microstructure and microwave dielectric properties of CaV 2 O 6 ceramic were analysed. The XRD patterns of the sintered samples indicated a single‐phase of CaV 2 O 6 in all temperatures. Substitution of Zn 2+ caused a lower sintering temperature and improved the densification of the CaV 2 O 6 ceramic. While the dielectric properties of the (Ca 0.95 Ba0 .05 )V 2 O 6 compound were not desirable, the (Ca 0.95 Zn 0.05 )V 2 O 6 sample sintered at 650°C for 4 hours showed significant dielectric properties, with ε r = 10.29, Q × f ~ 53 000 GHz (at 15.5 GHz) and τ f = −72.37 ppm/°C. Moreover, the chemical compatibility of the CaV 2 O 6 ceramic with Al electrode was examined.