Microstructural evolution of some MgO–TiO 2 and MgO–Al 2O 3 powder mixtures during high-energy ball milling and post-annealing studied by X-ray diffraction

Abstract

High-energy dry ball-mill and post-anneal processing were applied to synthesize MgTiO 3 and Mg 2TiO 4 single crystalline phases from the predetermined compositions of MgO–TiO 2 powder mixtures. Also, the experiments were performed to show that it is possible to prepare MgAl 2O 4 single crystalline phase from the predetermined composition of MgO–Al 2O 3 powder mixture only by employing high-energy dry ball milling, i.e. without post-annealing the milled samples. In contrast, fully developed single crystalline powders of MgTiO 3 and Mg 2TiO 4 were obtained after post-annealing the milled samples for 1 h at 900 and 1200 °C, respectively.