Fabrication and microwave dielectric properties of a new LTCC ceramic composite based on Li₂O-Nb₂O₅-TiO₂ system

A new Li₂O-Nb₂O₅-TiO₂ (LNT) system ceramic composite with the Li₂O: Nb₂O₅: TiO₂ mole ratio of 5 : 1 : 5 has been investigated. The compound is composed of two phases, the Li₂TiO₃ and "M-phase" solid solution phase. The two phases constitute a special structure in the new ceramic composite. The microwave dielectric ceramic composite has low sintering temperature (∼ 1100 °C) and good microwave dielectric properties of a relatively high permittivity (∼ 36), high Q ^* f value up to 10,482 (5.9 GHz), and near zero temperature coefficient (∼ 12.2 ppm/°C). Adding 1 wt.% B₂O₃ could effectively lower the sintering temperature from 1100 to 900 °C and does not induce degradation of the microwave dielectric properties, which indicate that ceramic would be a promising candidate for low-temperature co-fired ceramics (LTCC) applications.