“…[1][2][3][4]), the second is Mg-intermetallic compound, for example, Mg-Mg 2 Ni, Mg-LaNi 5 , Mg-TiFe, Mg-metal oxides (MnO 2 , TiO 2 , NiO, etc.) [5][6][7], the third type is Mg-organic substance, e.g. Mg-tetrahydrofuran, Mgbenzene and Mg-cyclohexane, etc.…”