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

摘要

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 deg C, respectively.