Materials Data on Dy3AlNiS7 by Materials Project

Abstract

Dy3NiAlS7 crystallizes in the hexagonal P6_3 space group. The structure is three-dimensional. Dy3+ is bonded to seven S2- atoms to form distorted DyS7 pentagonal bipyramids that share a cornercorner with one NiS6 octahedra, corners with six equivalent DyS7 pentagonal bipyramids, corners with two equivalent AlS4 tetrahedra, an edgeedge with one NiS6 octahedra, edges with four equivalent DyS7 pentagonal bipyramids, an edgeedge with one AlS4 tetrahedra, and a faceface with one NiS6 octahedra. The corner-sharing octahedral tilt angles are 24°. There are a spread of Dy–S bond distances ranging from 2.75–2.99 Å. Ni2+ is bonded to six equivalent S2- atoms to form NiS6 octahedra that share corners with three equivalent DyS7 pentagonal bipyramids, edges with three equivalent DyS7 pentagonal bipyramids, faces with two equivalent NiS6 octahedra, and faces with three equivalent DyS7 pentagonal bipyramids. There are three shorter (2.40 Å) and three longer (2.52 Å) Ni–S bond lengths. Al3+ is bonded to four S2- atoms to form AlS4 tetrahedra that share corners with six equivalent DyS7 pentagonal bipyramids and edges with three equivalent DyS7 pentagonal bipyramids. There are one shorter (2.24 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 to three equivalent Dy3+ and two equivalent Ni2+ atoms to form distorted SDy3Ni2 square pyramids that share corners with two equivalent SDy3Ni2 square pyramids, corners with three equivalent SDy3Al tetrahedra, edges with four equivalent SDy3Ni2 square pyramids, and faces with two equivalent SDy3Ni2 square pyramids. In the second S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three equivalent Dy3+ and one Al3+ atom. In the third S2- site, S2- is bonded to three equivalent Dy3+ and one Al3+ atom to form distorted corner-sharing SDy3Al tetrahedra.