Microwave dielectric properties of Li2ZnTi3O8 ceramics doped with ZnO-B2O3 frit

Li2ZnTi3O8 ceramics doped with ZnO-B2O3 frit were prepared by the conventional solid-state reaction. The effects of the ZnO-B2O3 frit on the sintering characteristic, phase composition, microstructure and microwave dielectric properties of Li2ZnTi3O8 ceramics were investigated. A single-phase Li2ZnTi3O8 is formed and no secondary phase is found in the XRD patterns. It is also found that ZnO-B2O3 frit can lower the sintering temperature of the ceramics by about 200 degrees C without seriously deteriorating the microwave dielectric properties. Typically, the ceramics doped with 0.25 wt.% ZnO-B2O3 frit sintered at 950 degrees C show good microwave dielectric properties of epsilon(r) = 25.34, Q x f = 61,660 GHz, and tau(f) = -12.98 ppm/degrees C. (C) 2011 Elsevier B.V. All rights reserved.