Low temperature sintering and microwave dielectric properties of Li6Mg7Ti3O16 ceramics with LiF additive for LTCC applications
Li 6 Mg 7 Ti 3 O 16 ceramics were prepared by the conventional solid-state method with 1–5 wt% LiF as the sintering aid. Effects of LiF additions on the phase compositions, sintering characteristics, micro-structures and microwave dielectric properties of Li 6 Mg 7 Ti 3 O 16 ceramics were investigated. The LiF addition could effectively lower the sintering temperature of Li 6 Mg 7 Ti 3 O 16 ceramics from 1550 to 900 °C. For different LiF-doped compositions, the optimum dielectric permittivity ( ε r ) and quality factor ( Q · f ) values first increased and then decreased with the increase of LiF contents, whereas the temperature coefficient of resonant frequency ( τ f ) fluctuated between − 14.39 and − 8.21 ppm/°C. Typically, Li 6 Mg 7 Ti 3 O 16 ceramics with 4 wt% LiF sintered at 900 °C exhibited excellent microwave dielectric properties of ε r = 16.17, Q · f = 80,921 GHz and τ f = − 8.21 ppm/°C, which are promising materials for the low temperature co-fired ceramics applications.
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