SCHEDULED MAINTENANCE
Microstructure and sintering behavior of low temperature cofired Li4/5Mg4/5Ti7/5O4 ceramics containing BaCu(B2O5) and TiO2 and their compatibility with a silver electrode†
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Abstract
Li4/5Mg4/5Ti7/5O4 (LMT) ceramics were prepared via a solid-state reaction method. The LMT ceramics, sintered at 1100 °C, presented good microwave dielectric properties with εr = 22.8, Q × f = 100 000 GHz and τf = −15.0 ppm °C−1. BaCu(B2O5) (BCB) was added to lower the sintering temperature of the ceramics. The addition of BCB reduced the sintering temperature, but slightly degraded the microwave dielectric properties of the LMT ceramics. The 0.97LMT–0.03BCB ceramic showed a low sintering temperature of 900 °C and good microwave dielectric properties with an appropriate εr of 20.9, high Q × f of 42 104 GHz and negative τf of −24.0 ppm °C−1. TiO2 was added to improve the εr and adjust the τf value. The 0.85(0.97LMT–0.03BCB)–0.15TiO2 ceramic, sintered at 875 °C, showed good dielectric properties, with a high Q × f of 37 700 GHz, appropriate εr of 23.1 and near-zero τf of −5.9 ppm °C−1. Obviously, the 0.85(0.97LMT–0.03BCB)–0.15TiO2 ceramic is a good candidate for low temperature co-fired ceramic devices.
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