Materials Data on Nd3AlNiS7 by Materials Project
Nd3NiAlS7 crystallizes in the hexagonal P6_3 space group. The structure is three-dimensional. Nd3+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of Nd–S bond distances ranging from 2.85–3.05 Å. Ni2+ is bonded to six equivalent S2- atoms to form face-sharing NiS6 octahedra. There are three shorter (2.45 Å) and three longer (2.55 Å) Ni–S bond lengths. Al3+ is bonded in a tetrahedral geometry to four S2- atoms. There are one shorter (2.22 Å) and three longer (2.25 Å) Al–S bond lengths. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a distorted tetrahedral geometry to three equivalent Nd3+ and one Al3+ atom. In the second S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three equivalent Nd3+ and one Al3+ atom. In the third S2- site, S2- is bonded in a 5-coordinate geometry to three equivalent Nd3+ and two equivalent Ni2+ atoms.