Materials Data on PrMgSe3 by Materials Project
MgPrSe3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Mg2+ is bonded to six Se2- atoms to form distorted MgSe6 octahedra that share corners with eight equivalent PrSe4 tetrahedra and edges with three equivalent MgSe6 octahedra. There are a spread of Mg–Se bond distances ranging from 2.66–3.08 Å. Pr4+ is bonded to four Se2- atoms to form PrSe4 tetrahedra that share corners with eight equivalent MgSe6 octahedra and an edgeedge with one PrSe4 tetrahedra. The corner-sharing octahedra tilt angles range from 53–78°. There are a spread of Pr–Se bond distances ranging from 2.83–2.86 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a distorted trigonal planar geometry to two equivalent Mg2+ and one Pr4+ atom. In the second Se2- site, Se2- is bonded to two equivalent Mg2+ and two equivalent Pr4+ atoms to form distorted edge-sharing SePr2Mg2 tetrahedra.