Materials Data on TbFeAsO by Materials Project

Abstract

TbOFeAs is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Tb3+ is bonded in a 4-coordinate geometry to four equivalent As3- and four equivalent O2- atoms. All Tb–As bond lengths are 3.31 Å. All Tb–O bond lengths are 2.27 Å. Fe2+ is bonded to four equivalent As3- atoms to form a mixture of edge and corner-sharing FeAs4 tetrahedra. All Fe–As bond lengths are 2.61 Å. As3- is bonded in a 8-coordinate geometry to four equivalent Tb3+ and four equivalent Fe2+ atoms. O2- is bonded to four equivalent Tb3+ atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra.