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DOE OSTI2020

Materials Data on NdTeBrO3 by Materials Project

NdTeO3Br crystallizes in the tetragonal P4/nmm space group. The structure is two-dimensional and consists of one NdOBr sheet oriented in the (0, 0, 1) direction and two NdTe2O5Br sheets oriented in the (0, 0, 1) direction. In the NdOBr sheet, Nd3+ is bonded in a 4-coordinate geometry to four equivalent O2- and four equivalent Br1- atoms. All Nd–O bond lengths are 2.32 Å. All Nd–Br bond lengths are 3.24 Å. O2- is bonded to four equivalent Nd3+ atoms to form a mixture of edge and corner-sharing ONd4 tetrahedra. Br1- is bonded in a 4-coordinate geometry to four equivalent Nd3+ atoms. In each NdTe2O5Br sheet, Nd3+ is bonded to twelve O2- atoms to form NdO12 cuboctahedra that share corners with four equivalent NdO12 cuboctahedra, faces with four equivalent NdO12 cuboctahedra, and faces with four equivalent TeO5 square pyramids. There are a spread of Nd–O bond distances ranging from 2.55–2.79 Å. There are two inequivalent Te4+ sites. In the first Te4+ site, Te4+ is bonded to five O2- atoms to form distorted TeO5 square pyramids that share corners with four equivalent TeO5 square pyramids and faces with four equivalent NdO12 cuboctahedra. There are one shorter (1.99 Å) and four longer (2.02 Å) Te–O bond lengths. In the second Te4+ site, Te4+ is bonded in a 4-coordinate geometry to four equivalent O2- and four equivalent Br1- atoms. All Te–O bond lengths are 2.17 Å. All Te–Br bond lengths are 3.29 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to four equivalent Nd3+ and one Te4+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Nd3+ and two equivalent Te4+ atoms. In the third O2- site, O2- is bonded to two equivalent Nd3+, two equivalent Te4+, and two equivalent Br1- atoms to form a mixture of distorted edge, face, and corner-sharing ONd2Te2Br2 tetrahedra. Both O–Br bond lengths are 3.35 Å. Br1- is bonded in a 8-coordinate geometry to four equivalent Te4+ and four equivalent O2- atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on NdTe2BrO5 by Materials Project

NdTe2O5Br crystallizes in the tetragonal I422 space group. The structure is three-dimensional. there are two inequivalent Nd3+ sites. In the first Nd3+ site, Nd3+ is bonded to twelve O2- atoms to form a mixture of distorted face and corner-sharing NdO12 cuboctahedra. There are a spread of Nd–O bond distances ranging from 2.59–2.75 Å. In the second Nd3+ site, Nd3+ is bonded to twelve O2- atoms to form a mixture of distorted face and corner-sharing NdO12 cuboctahedra. There are a spread of Nd–O bond distances ranging from 2.59–2.75 Å. There are five inequivalent Te4+ sites. In the first Te4+ site, Te4+ is bonded in a 5-coordinate geometry to five O2- atoms. There are one shorter (1.94 Å) and four longer (2.13 Å) Te–O bond lengths. In the second Te4+ site, Te4+ is bonded in a 4-coordinate geometry to four O2- and four Br1- atoms. All Te–O bond lengths are 2.05 Å. All Te–Br bond lengths are 3.39 Å. In the third Te4+ site, Te4+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Te–O bond distances ranging from 1.94–2.14 Å. In the fourth Te4+ site, Te4+ is bonded in a 4-coordinate geometry to four O2- and four Br1- atoms. All Te–O bond lengths are 2.05 Å. All Te–Br bond lengths are 3.39 Å. In the fifth Te4+ site, Te4+ is bonded in a 4-coordinate geometry to four O2- and four Br1- atoms. All Te–O bond lengths are 2.05 Å. All Te–Br bond lengths are 3.39 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two Nd3+ and two Te4+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two Nd3+ and two Te4+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two Nd3+ and two Te4+ atoms. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to four Nd3+ and one Te4+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to four Nd3+ and one Te4+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two Nd3+ and two Te4+ atoms. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 4-coordinate geometry to four Te4+ atoms. In the second Br1- site, Br1- is bonded in a 4-coordinate geometry to four Te4+ atoms.

36 MATERIALS SCIENCE↗