Materials Data on Sm2Fe2As2O by Materials Project

Sm2Fe2As2O crystallizes in the tetragonal P-4m2 space group. The structure is three-dimensional. Sm2+ is bonded in a distorted bent 120 degrees geometry to four equivalent As3- and two equivalent O2- atoms. All Sm–As bond lengths are 3.09 Å. Both Sm–O bond lengths are 2.38 Å. Fe2+ is bonded to four equivalent As3- atoms to form a mixture of corner and edge-sharing FeAs4 tetrahedra. All Fe–As bond lengths are 2.48 Å. As3- is bonded in a 8-coordinate geometry to four equivalent Sm2+ and four equivalent Fe2+ atoms. O2- is bonded to four equivalent Sm2+ atoms to form corner-sharing OSm4 tetrahedra.