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Effect of BaCu(B2O5) additives on the sintering behavior and microwave dielectric properties of LiNb0.6Ti0.5O3 ceramics for LTCC application

Mao Zeng,Xiaohui Wu,Hua Su,Jingkang Xu,Xiaoli Tang

Herein, Li 1.0 Nb 0.6 Ti 0.5 O 3 +  x wt% BaCu(B 2 O 5 ) (0 ≤  x  ≤ 0.8) ceramics were synthesized via the traditional solid-state reaction method. The sintering behavior, phase, Raman spectra, microwave dielectric characteristics, and chemical compatibility with Ag of the Li 1.0 Nb 0.6 Ti 0.5 O 3 +  x wt% BaCu(B 2 O 5 ) samples were comprehensively analyzed. The results show that doping the Li 1.0 Nb 0.6 Ti 0.5 O 3 ceramics with BaCu(B 2 O 5 ) can not only reduce the sintering temperature from 1100 °C to 950 °C but also effectively improve the density and quality factor ( Q × f ) of the Li 1.0 Nb 0.6 Ti 0.5 O 3 samples. Additionally, Li 1.0 Nb 0.6 Ti 0.5 O 3 + 0.4 wt% BaCu(B 2 O 5 ) samples, which were sintered at 950 °C for 4 h, exhibit excellent microwave dielectric properties ( ε r = 61.4, Q × f = 6423 GHz, and τ f = 27.5 ppm/°C) and excellent chemical compatibility with Ag, which makes these ceramics potential candidate materials in the low-temperature co-fired ceramic technology.