Formation of imperfect magnesium oxide modified by Mg(NO3)(2) and LiNO3 asprobed by IR spectra

The mechanism of formation of defect magnesium oxide during MgO hydration i n solutions of Mg(NO3)(2) and LiNO3 is studied. An extraordinary compound w hose bulk composition can be presented as [Mg(0.925)square(0.045)(N)(0.03)] O-1, is produced by solid-phase transformations in the products of MgO hydr ation in the Mg(NO3)(2) solution. The defect magnesium oxide prepared in th is manner is inhomogeneous both in structure and charge; it possesses high stability and is active in chain-radical reactions of hydrocarbon pyrolysis , In the LiNO3 solution, the starting magnesium oxide hydrates only partly. The resulting defect Mg(OH)(2), which is modified by Li+ and NO3- ions, al so transforms to defect magnesium oxide upon calcining. The defect MgO prep ared in this manner is less stable and transforms into ordinary magnesium o xide when exposed to the reaction medium.