Abstract
ABSTRACTMg4Nb2O9 ceramics were prepared by using nanopowders (average grain size of 63.4 nm) as a precursor, synthesized via high-energy ball milling method at 900°C. The microstructure, sintering behaviors and microwave dielectric properties of ceramics are systematically investigated. Due to the refined grains, Sintering temperature of Mg4Nb2O9 ceramics is effectively reduced to 1200°C, 150°C lower than that required by a conventional solid state reaction process. Mg4Nb2O9 ceramics possess a relative densities of 96.4%, a grain size of 1.5–5.0 μm and an excellent microwave dielectric properties (ϵr of 12.6, Q ×f of 175810.0 GHz, and τf of −56.6 ppm/°C), which make it as a potential candidate for practical application.
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