FeAlN2 is Enargite-like structured and crystallizes in the orthorhombic Pna2_1 space group. Fe(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form FeN4 tetrahedra that share corners with four equivalent Fe(1)N4 tetrahedra and corners with eight equivalent Al(1)N4 tetrahedra. Al(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form AlN4 tetrahedra that share corners with four equivalent Al(1)N4 tetrahedra and corners with eight equivalent Fe(1)N4 tetrahedra. There are two inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Fe(1) and two equivalent Al(1) atoms to form corner-sharing NAl2Fe2 tetrahedra. In the second N site, N(2) is bonded to two equivalent Fe(1) and two equivalent Al(1) atoms to form corner-sharing NAl2Fe2 tetrahedra.
FeAlN2 is Enargite-like structured and crystallizes in the orthorhombic Pna2_1 space group. Fe(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form FeN4 tetrahedra that share corners with four equivalent Fe(1)N4 tetrahedra and corners with eight equivalent Al(1)N4 tetrahedra. There is one shorter (1.87 Å) and one longer (1.88 Å) Fe(1)-N(1) bond length. There is one shorter (1.87 Å) and one longer (1.89 Å) Fe(1)-N(2) bond length. Al(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form AlN4 tetrahedra that share corners with four equivalent Al(1)N4 tetrahedra and corners with eight equivalent Fe(1)N4 tetrahedra. There is one shorter (1.90 Å) and one longer (1.92 Å) Al(1)-N(1) bond length. There is one shorter (1.88 Å) and one longer (1.89 Å) Al(1)-N(2) bond length. There are two inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Fe(1) and two equivalent Al(1) atoms to form corner-sharing NAl2Fe2 tetrahedra. In the second N site, N(2) is bonded to two equivalent Fe(1) and two equivalent Al(1) atoms to form corner-sharing NAl2Fe2 tetrahedra.