A novel temperature-stable (1−m)Li2TiO3–mZn3Nb2O8 microwave dielectric ceramic

Abstract

The novel (1 [Formula: see text]Li2TiO[Formula: see text]Zn3Nb2O8 ([Formula: see text] = 0.1, 0.16, 0.2, and 0.3) microwave dielectric ceramics were prepared by the solid-state reaction method. Phases and microstructures were analyzed by XRD and SEM, which showed the formation of Li2Zn(Ti[Formula: see text]Nb[Formula: see text]O8 solid solution instead of the coexistence of Li2TiO3 and Zn3Nb2O8. The formation of Li2Zn(Ti[Formula: see text]Nb[Formula: see text]O8 solid solution can be ascribed to the complex chemical reaction between Li2TiO3 and Zn3Nb2O8. The sintering behavior and microwave dielectric properties were investigated as functions of sintering temperatures and [Formula: see text] value. The 0.84Li2TiO[Formula: see text] 0.16Zn3Nb2O8 ceramics were well densified at 1100[Formula: see text]C and possessed excellent microwave dielectric properties with [Formula: see text] 18.05, [Formula: see text] ×[Formula: see text] [Formula: see text] 25,791 GHz (at 10.02 GHz), and a near-zero [Formula: see text] value [Formula: see text]−6.09 ppm/°C because of the function of Li2Zn([Formula: see text]Nb[Formula: see text]O8 solid solution. It provides new candidates for the field of wireless communication technology.