Effects of Mg(OH)2 on phase formation and microwave dielectric properties of Mg6Ti5O16 ceramics

AbstractMg6Ti5O16 ceramics have been prepared by the conventional solid-state route using Mg(OH)2 as the magnesium source and their sinterability, phase composition and microwave dielectric properties were studied. X-ray diffraction analysis indicated that all samples presented mixture phases of MgTiO3 and Mg2TiO4. As the sintering temperature rising, the density, e r and Q׃ values first increased and then decreased, whereas the τf values did not change remarkably. Typically, nominal ceramics Mg6Ti5O16 sintered at 1340 °C owned good microwave dielectric properties: e r=16.7, Q × f = 143 481 GHz (at 8.55 GHz), and τ f= −51.5 ppm/°C. The correlation between dielectric properties and microstructure is also discussed.