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Published in:
26-10-2015
Dielectric properties of ultralow-fired Mg4Nb2O9 ceramics co-doped with TiO2 and LiF
Published in: Journal of Materials Science: Materials in Electronics | Issue 2/2016
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Abstract
The Mg4Nb2O9 co-doped with 20 wt% TiO2 (MNT) and x wt% LiF (1 ≤ x ≤ 8) composite ceramics were prepared by a solid-state reaction method for developing ultralow-fired (≤800 °C) microwave dielectric ceramics. The sintering temperatures of MNT ceramics were successfully lowered to 750 °C due to the formation of liquid phase (LiF). A secondary phase of MgTiO3 was observed at above 700 °C for MNT-8 wt% LiF ceramics. All the composite ceramics have the optimal bulk densities at 800 °C, which corresponds to the maximum Q × f value of 32,000 GHz and ɛ
r
value of 15.7. The well microwave dielectric properties of ɛ
r
= 15.6, Q × f = 25,000 GHz, and τ
f
= −56 ppm/°C were obtained at 750 °C for 5 h for MNT-8 wt% LiF ceramics. This material is compatible with Ag electrodes, suitable for low-temperature co-fired ceramics applications.