添加Li2O-MgO-B2O3玻璃的Li2MgTi3O8陶瓷的微波介电性能及其与Ag共烧相容性

摘要

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.%研究添加Li2O-MgO-B2O3玻璃对Li2MgTi3O8陶瓷的烧结特性、相纯度、微观组织和微波介电性能的影响。结果表明：添加少量的玻璃能有效地将陶瓷的烧结温度从1025°C降低到875°C，且没有恶化陶瓷的微波介电性能。添加1.5%玻璃的陶瓷在875°C烧结4 h后具有优良的微波介电性能能，其介电常数εr=25.9，品质因数Q×f=45403 GHz，谐振频率温度系数τf≈0。陶瓷和Ag电极共烧几乎不发生化学反应，表现为良好的化学相容性。所制备的陶瓷可望用于低温烧结的多层微波器件。