The electronic, optical, and thermodynamical properties of tetragonal, monoclinic, and orthorhombic M3N4 (M = Si, Ge, Sn): A first-principles study

The electronic, optical, and thermodynamical properties of tetragonal, monoclinic, and orthorhombic M₃N₄ (M = Si, Ge, Sn): A first-principles study

Chen Dong^{1, †}, Cheng Ke², Qi Bei-Ying¹

(color online) Temperature-dependent entropy S of the tetragonal, monoclinic, and orthorhombic phases for (a) Si₃N₄; (b) Ge₃N₄, and (c) Sn₃N₄.