DOE OSTI2020
Ti5(FeSb)4 crystallizes in the trigonal R3m space group. The structure is three-dimensional. there are five inequivalent Ti sites. In the first Ti site, Ti is bonded in a body-centered cubic geometry to four Fe and four Sb atoms. There are one shorter (2.71 Å) and three longer (2.74 Å) Ti–Fe bond lengths. There are three shorter (2.81 Å) and one longer (2.85 Å) Ti–Sb bond lengths. In the second Ti site, Ti is bonded in a body-centered cubic geometry to four Fe and four Sb atoms. There are one shorter (2.64 Å) and three longer (2.78 Å) Ti–Fe bond lengths. There are one shorter (2.63 Å) and three longer (2.70 Å) Ti–Sb bond lengths. In the third Ti site, Ti is bonded in a body-centered cubic geometry to four Fe and four Sb atoms. There are one shorter (2.64 Å) and three longer (2.69 Å) Ti–Fe bond lengths. There are three shorter (2.67 Å) and one longer (2.74 Å) Ti–Sb bond lengths. In the fourth Ti site, Ti is bonded in a body-centered cubic geometry to four Fe and four Sb atoms. There are three shorter (2.72 Å) and one longer (2.79 Å) Ti–Fe bond lengths. There are three shorter (2.70 Å) and one longer (2.71 Å) Ti–Sb bond lengths. In the fifth Ti site, Ti is bonded in a body-centered cubic geometry to four Fe and four Sb atoms. There are one shorter (2.61 Å) and three longer (2.69 Å) Ti–Fe bond lengths. There are one shorter (2.78 Å) and three longer (2.84 Å) Ti–Sb bond lengths. There are four inequivalent Fe sites. In the first Fe site, Fe is bonded in a 7-coordinate geometry to seven Ti atoms. In the second Fe site, Fe is bonded in a 11-coordinate geometry to five Ti and six Sb atoms. There are three shorter (2.96 Å) and three longer (3.26 Å) Fe–Sb bond lengths. In the third Fe site, Fe is bonded in a 4-coordinate geometry to four Ti and six Sb atoms. There are three shorter (3.06 Å) and three longer (3.18 Å) Fe–Sb bond lengths. In the fourth Fe site, Fe is bonded in a 4-coordinate geometry to four Ti and six Sb atoms. There are three shorter (3.04 Å) and three longer (3.15 Å) Fe–Sb bond lengths. There are four inequivalent Sb sites. In the first Sb site, Sb is bonded in a 5-coordinate geometry to five Ti and three equivalent Fe atoms. In the second Sb site, Sb is bonded to four Ti and six Fe atoms to form a mixture of distorted face and corner-sharing SbTi4Fe6 tetrahedra. In the third Sb site, Sb is bonded in a 10-coordinate geometry to seven Ti and three equivalent Fe atoms. In the fourth Sb site, Sb is bonded to four Ti and six Fe atoms to form a mixture of distorted face and corner-sharing SbTi4Fe6 tetrahedra.