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Na2CaTi2Ge3O12: An anti-reductive garnet ceramic with high quality factor and chemical compatibility with Cu/Ag electrodes for low temperature co-fired application

Hongrong Mei,Liangbin Zhang,Zhenggang Rao,Longlong Shu,Weiping Gong,Chunchun Li

Microwave dielectric ceramics with excellent properties and low sintering temperatures are pursued saving energy and cofiring with metal electrodes (especially Ag, Cu). Herein, a low-firing Na 2 CaTi 2 Ge 3 O 12 garnet was fabricated via a simple solid-state method. XRD , SEM, Raman spectrum, and dielectric characterization were used to reveal the influence of sintering temperature on crystal structure and dielectric properties . A single-phase Na 2 CaTi 2 Ge 3 O 12 ceramic densified at 960 °C has the optimized dielectric properties with ε r = 15.3 ± 0.2, Q × f = 55,900 ± 2000 GHz, and τ f = −15.7 ± 0.5 ppm/°C. The infrared (IR) spectrum was applied to estimate the intrinsic contribution of lattice vibration to microwave dielectric properties. The anti-reductive feature of Na 2 CaTi 2 Ge 3 O 12 ceramic was evaluated via sintering at a reducing atmosphere while cofiring with Cu electrodes. The good chemical compatibility with Ag and Cu electrodes manifests the potential prospect of Na 2 CaTi 2 Ge 3 O 12 ceramic in the low-temperature co-fired ceramic (LTCC) application.