Materials Data on Sm2O3 by Materials Project

Abstract

Sm2O3 crystallizes in the tetragonal P-4m2 space group. The structure is three-dimensional. Sm3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are four shorter (2.30 Å) and two longer (2.54 Å) Sm–O bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Sm3+ atoms to form a mixture of edge and corner-sharing OSm4 tetrahedra. In the second O2- site, O2- is bonded to four equivalent Sm3+ atoms to form a mixture of edge and corner-sharing OSm4 tetrahedra. In the third O2- site, O2- is bonded to four equivalent Sm3+ atoms to form a mixture of edge and corner-sharing OSm4 tetrahedra.