Abstract: Layered rock configuration MgO powders were prepared through molten salt synthesis with MgCl_2·6H_2O, CaCO_3 ,LiCl as raw materials.They were studied by using XRD and TEM while reactants were investigated by TG-DSC and XRD.The results indicated that MgO was formed at 430 ℃ calcined for 3 h.When calcined at 600 ℃, only MgO product existed in the resultant after washed by Ethanol. If raw materials calcined at 650 ℃ for 3 h,Mg(OH)_2 powders soaked by water were non-regular flakes.They changed into non-regular granular shapes when decomposed to MgO with 0.1-0.6 μm in diameter. On the other side, Mg(OH)_2 powders soaked by PEG-EDTA solution were tetrahedrons.They changed into layered rock configurations with vertex defected when decomposed to MgO,which brim were up to 1.5 μm in length.Linked by some granular,MgO were non-smooth surface.

Key words: molten synthesis;layered rock configuration;magnesia powder