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The pressure-induced phase transformations in NaNH2 have been studied by using ab-initio total-energy calculations and evolutionary structure prediction simulations.Static enthalpy calculations indicated that the ground-state phase α-NaNH2 (orthorhombic,Fddd) first transforms into β-NaNH2 (orthorhombic,P21212) at 2.2 GPa and then into γ-NaNH2 (monoclinic,C2/c) at 9.4 GPa .