Low-firable high-K dielectric in the Zr x(Zn 1/3Nb 2/3) 1− xTiO 4 ceramic system

Abstract

Composite ceramics in the solid solution of Zr x (Zn 1/3Nb 2/3) 1− x TiO 4 ( x = 0.1–0.4) have been prepared by the mixed oxide route. Formation of solid solution was confirmed by the X-ray diffraction patterns. The microwave dielectric properties, such as dielectric constant ( ɛ r ), Q × f value and temperature coefficient of resonant frequency ( τ f ) have been investigated as a function of composition and sintering temperature. With x increasing from 0.1 to 0.4, the dielectric constant decreases from 70.9 to 43.2, and the τ f decreases from 105 to 55 ppm/°C. The Q × f value, however, increases with increasing x value to a maximum 26,600 GHz (at 6 GHz) at x = 0.3, and then decreases thereafter. For low-loss microwave applications, a new microwave dielectric material Zr 0.3(Zn 1/3Nb 2/3) 0.7TiO 4, possessing a fine combination of microwave dielectric properties with a high ɛ r of 51, a high Q × f of 26,600 GHz (at 6 GHz) and a τ f of 70 ppm/°C, is suggested.