SrNd2S4 crystallizes in the tetragonal I-42d space group. Sr(1) is bonded to eight equivalent S(1) atoms to form distorted SrS8 hexagonal bipyramids that share corners with eight equivalent Nd(1)S8 hexagonal bipyramids, edges with four equivalent Sr(1)S8 hexagonal bipyramids, and faces with eight equivalent Nd(1)S8 hexagonal bipyramids. Nd(1) is bonded to eight equivalent S(1) atoms to form distorted NdS8 hexagonal bipyramids that share corners with four equivalent Sr(1)S8 hexagonal bipyramids, corners with four equivalent Nd(1)S8 hexagonal bipyramids, edges with four equivalent Nd(1)S8 hexagonal bipyramids, faces with four equivalent Sr(1)S8 hexagonal bipyramids, and faces with four equivalent Nd(1)S8 hexagonal bipyramids. S(1) is bonded to two equivalent Sr(1) and four equivalent Nd(1) atoms to form a mixture of distorted face, corner, and edge-sharing SSr2Nd4 octahedra. The corner-sharing octahedral tilt angles range from 16-51°.
SrNd2S4 crystallizes in the tetragonal I-42d space group. Sr(1) is bonded to eight equivalent S(1) atoms to form distorted SrS8 hexagonal bipyramids that share corners with eight equivalent Nd(1)S8 hexagonal bipyramids, edges with four equivalent Sr(1)S8 hexagonal bipyramids, and faces with eight equivalent Nd(1)S8 hexagonal bipyramids. There are four shorter (2.96 Å) and four longer (3.15 Å) Sr(1)-S(1) bond lengths. Nd(1) is bonded to eight equivalent S(1) atoms to form distorted NdS8 hexagonal bipyramids that share corners with four equivalent Sr(1)S8 hexagonal bipyramids, corners with four equivalent Nd(1)S8 hexagonal bipyramids, edges with four equivalent Nd(1)S8 hexagonal bipyramids, faces with four equivalent Sr(1)S8 hexagonal bipyramids, and faces with four equivalent Nd(1)S8 hexagonal bipyramids. There are a spread of Nd(1)-S(1) bond distances ranging from 2.86-3.11 Å. S(1) is bonded to two equivalent Sr(1) and four equivalent Nd(1) atoms to form a mixture of distorted face, corner, and edge-sharing SSr2Nd4 octahedra. The corner-sharing octahedral tilt angles range from 16-51°.