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Micro structural evolution of some MgO-TiO2 and MgO-Al2O3 powder mixtures during high-energy ball milling and post-annealing studied by X-ray diffraction

High-energy dry ball-mill and post-anneal processing were applied to synthesize MgTiO3 and Mg2TiO4 single crystalline phases from the predetermined compositions of MgO-TiO2 powder mixtures. Also, the experiments were performed to show that it is possible to prepare MgAl2O4 single crystalline phase from the predetermined composition of MgO-Al2O3 powder mixture only by employing high-energy dry ball milling, i.e. without the post-annealing the milled samples. In contrast, fully developed single crystalline powders of MgTiO3 and Mg2TiO4 were obtained after post-annealing the milled samples for one hour at 900 oC and 1200 oC, respectively.

Preparation of insulators: MgTiO3; Mg2TiO4 and MgAl2O4 single-phase powders; MgO-TiO2 and MgO-Al2O3 powder mixtures; High-energy ball milling; Post-anneal processing; X-ray diffraction method.

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