Materials Data on Ho8Sb3O8 by Materials Project
Ho8Sb3O8 crystallizes in the monoclinic C2 space group. The structure is three-dimensional. there are four inequivalent Ho3+ sites. In the first Ho3+ site, Ho3+ is bonded in a 3-coordinate geometry to four Sb+2.67- and three O2- atoms. There are a spread of Ho–Sb bond distances ranging from 3.26–3.46 Å. There are a spread of Ho–O bond distances ranging from 2.21–2.23 Å. In the second Ho3+ site, Ho3+ is bonded in a distorted see-saw-like geometry to two equivalent Sb+2.67- and four O2- atoms. Both Ho–Sb bond lengths are 3.21 Å. There are a spread of Ho–O bond distances ranging from 2.22–2.43 Å. In the third Ho3+ site, Ho3+ is bonded in a distorted see-saw-like geometry to two equivalent Sb+2.67- and four O2- atoms. Both Ho–Sb bond lengths are 3.25 Å. There are three shorter (2.21 Å) and one longer (2.31 Å) Ho–O bond lengths. In the fourth Ho3+ site, Ho3+ is bonded in a 4-coordinate geometry to four Sb+2.67- and four O2- atoms. There are a spread of Ho–Sb bond distances ranging from 3.30–3.50 Å. There are a spread of Ho–O bond distances ranging from 2.20–2.32 Å. There are two inequivalent Sb+2.67- sites. In the first Sb+2.67- site, Sb+2.67- is bonded in a body-centered cubic geometry to eight Ho3+ atoms. In the second Sb+2.67- site, Sb+2.67- is bonded in a body-centered cubic geometry to eight Ho3+ atoms. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to four Ho3+ atoms to form a mixture of edge and corner-sharing OHo4 tetrahedra. In the second O2- site, O2- is bonded to four Ho3+ atoms to form a mixture of edge and corner-sharing OHo4 tetrahedra. In the third O2- site, O2- is bonded to four Ho3+ atoms to form a mixture of edge and corner-sharing OHo4 trigonal pyramids. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Ho3+ atoms.