Keio University, Department of Applied Chemistry, Faculty of Science and Technology, 3–14-1 Hiyoshi, Kohoku-ku, Yokohama 223, Japan
Abstract:
Mechanochemical effects on the formation of Mg---O---Ti complex and microwave dielectric properties of MgTiO3 oxides were studied using several different starting materials. Single phase MgTiO3 powder was obtained after heating (900 °C, 2 h) the mechanically activated precursor from a mixture of two unitary powders, magnesium hydroxide and anatase (MP). Formation of MgTiO3 on subsequent thermal treatment was significantly accelerated by incipient mechanochemical interaction. The Q value of the ceramics sintered at 1350 °C for 2 h from MP was higher than those of three other ceramics due to the uniformity of the microstructure and phase.