Microwave dielectric properties of Li_2ZnTi_3O_8 ceramics prepared by reaction-sintering process

摘要

Li_2ZnTi_3O_8 (LZT) microwave dielectric ceramics prepared by reaction-sintering process were investigated. Li_2CO_3, ZnO and TiO_2 powders were mixed, pressed and sintered directly into ceramic pellets without any calcination stage involved. Pure LZT phase was obtained after sintering at temperatures above 1,100 ℃ for 2 h. LZT ceramic with the maximum bulk density of 3.81 g/cm~3 (96.2 % of the theoretical value) and excellent microwave dielectric properties of ε_r = 25.8, Q × f= 78,216 GHz and τ_f= -10.5 ppm/℃ was obtained after sintering at 1,100 ℃ for 2 h. The results show that the reaction-sintering process is a simple and effective method to produce LZT ceramics.