Nuclear magnetic resonance study of the phase transitions and local environments of α-alum NH4Al(SO4)2·12H2O single crystals

Temperature dependence of the T1, and T2, of the 27Al nuclei in a NH4Al(SO4)2·12H2O single crystal (inset: the inversion recovery behaviors of 27Al as a function of delay time for NH4Al(SO4)2·12H2O.