Materials Data on Sm2Se2O by Materials Project

Abstract

Sm2Se2O crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Sm3+ sites. In the first Sm3+ site, Sm3+ is bonded in a 1-coordinate geometry to six Se2- and one O2- atom. There are a spread of Sm–Se bond distances ranging from 2.89–3.08 Å. The Sm–O bond length is 2.34 Å. In the second Sm3+ site, Sm3+ is bonded in a 7-coordinate geometry to three Se2- and three equivalent O2- atoms. There are a spread of Sm–Se bond distances ranging from 2.95–3.12 Å. There are one shorter (2.34 Å) and two longer (2.39 Å) Sm–O bond lengths. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 5-coordinate geometry to five Sm3+ atoms. In the second Se2- site, Se2- is bonded in a 4-coordinate geometry to four Sm3+ atoms. O2- is bonded to four Sm3+ atoms to form a mixture of edge and corner-sharing OSm4 tetrahedra.