Microwave dielectric properties and compatibility with silver of low-fired Li2MgTi3O8 ceramics with Li2O-MgO-B2O3 frit
(1. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;
2. Guangxi Key Laboratory of Information Materials,
Guilin University of Electronic Technology, Guilin 541004, China)
2. Guangxi Key Laboratory of Information Materials,
Guilin University of Electronic Technology, Guilin 541004, China)
Abstract: The effects of Li2O-MgO-B2O3 (LMB) glass additive on the sintering characteristics, phase purity, microstructure, and microwave dielectric properties of Li2MgTi3O8 ceramics were investigated. The experimental results demonstrate that the addition of LMB glass effectively lowers the sintering temperature of Li2MgTi3O8 ceramic from 1025 °C to 875 °C and induces no obvious degradation of the microwave dielectric properties. Typically, the 1.5% LMB glass-added Li2MgTi3O8 ceramic sintered at 875 °C for 4 h shows excellent microwave dielectric properties of Q×f=45403 GHz, εr=25.9 and τf≈0 °C-1. The dielectric ceramic exhibits stability against the reaction with the Ag electrode, which indicates that the ceramics could be applied in multilayer microwave devices requiring low firing temperatures.
Key words: microwave ceramics; dielectric properties; glass; low-temperature sintering; compatibility