A novel low-fired and high-εr microwave dielectric ceramic BaCu(B_2O_5)-added 0.6Ca_(3/5)La_(4/15)TiO_3-0.4Li_(1/2)Nd_(1/2)TiO_3

摘要

A novel low-fired microwave dielectric ceramic, BaCu(B~(2)O~(5))-added 0.6Ca~(3/5)La~(4/15)TiO~(3)–0.4Li~(1/2)Nd~(1/2)TiO~(3)(abbreviated CLT–LNT), was prepared by solid state route. The influence of BaCu(B~(2)O~(5)) on the phase composition, sintering behavior and microwave dielectric properties of as-synthesized CLT–LNT ceramics was investigated. All the BaCu(B~(2)O~(5))-added CLT–LNT ceramic samples exhibited single phase orthorhombic perovskite structure. BaCu(B~(2)O~(5)) dramatically decreased the sintering temperature of CLT–LNT ceramics from 1400 to 930 °C. Favorable microwave dielectric properties (ε~(r) = 87.6, Q ×  f  = 6530 GHz, τ~( f ) = 3.2 ppm/°C) as well as the maximum relative density (97.9%) were obtained for the 1.6 wt% BaCu(B~(2)O~(5))-added CLT–LNT ceramic sintered at 930 °C for 3 h. Therefore, such a novel BaCu(B~(2)O~(5))-added CLT–LNT ceramic would be a promising candidate for low-temperature co-fired ceramics applications.