Reinvestigations of the Li2O–Al2O3 system. Part I: LiAlO2 and Li3AlO3

Reinvestigations of the Li O–Al system focused on the synthesis and properties of LiAlO and Li AlO phases have been performed with the help of XRD and IR measuring techniques and Li CO , LiOH·H O, Al -sl., α-Al , Al(NO ·9H O and boehmite as reactants. Results of investigations have shown the formation of α-, β-, and γ- polymorphs of LiAlO . It was found that only the use of LiOH·H O as a reactant yields to β-LiAlO as a reaction product. On the other hand, it was proved that Li AlO does not form in the Li O–Al system. A new method for the synthesis of α-LiAlO was developed, consisting in grinding the mixture of Li CO and Al(NO ·9H O and heating the obtained paste at the temperature range of 400–600 °C. The IR spectroscopy was used to characterize obtained phases.