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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on TlCr5Se8 by Materials Project

TlCr5Se8 is Orthorhombic Perovskite-like structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are three inequivalent Cr3+ sites. In the first Cr3+ site, Cr3+ is bonded to six Se2- atoms to form a mixture of edge and corner-sharing CrSe6 octahedra. The corner-sharing octahedral tilt angles are 48°. There are four shorter (2.52 Å) and two longer (2.54 Å) Cr–Se bond lengths. In the second Cr3+ site, Cr3+ is bonded to six Se2- atoms to form a mixture of edge, face, and corner-sharing CrSe6 octahedra. The corner-sharing octahedra tilt angles range from 48–51°. There are a spread of Cr–Se bond distances ranging from 2.50–2.66 Å. In the third Cr3+ site, Cr3+ is bonded to six Se2- atoms to form a mixture of edge, face, and corner-sharing CrSe6 octahedra. The corner-sharing octahedra tilt angles range from 48–51°. There are a spread of Cr–Se bond distances ranging from 2.50–2.64 Å. Tl1+ is bonded in a 12-coordinate geometry to ten Se2- atoms. There are a spread of Tl–Se bond distances ranging from 3.48–3.80 Å. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a distorted rectangular see-saw-like geometry to four Cr3+ and one Tl1+ atom. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to three equivalent Cr3+ and two equivalent Tl1+ atoms. In the third Se2- site, Se2- is bonded in a 3-coordinate geometry to three Cr3+ and two equivalent Tl1+ atoms. In the fourth Se2- site, Se2- is bonded to five Cr3+ atoms to form distorted edge-sharing SeCr5 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlCrSe2 by Materials Project

TlCrSe2 crystallizes in the trigonal R3m space group. The structure is two-dimensional and consists of three TlCrSe2 sheets oriented in the (0, 0, 1) direction. Cr3+ is bonded to six Se2- atoms to form distorted edge-sharing CrSe6 pentagonal pyramids. There are three shorter (2.44 Å) and three longer (2.45 Å) Cr–Se bond lengths. Tl1+ is bonded in a distorted single-bond geometry to one Se2- atom. The Tl–Se bond length is 3.25 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 3-coordinate geometry to three equivalent Cr3+ atoms. In the second Se2- site, Se2- is bonded in a distorted rectangular see-saw-like geometry to three equivalent Cr3+ and one Tl1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlCr3Se5 by Materials Project

Cr3TlSe5 is Orthorhombic Perovskite-like structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are four inequivalent Cr3+ sites. In the first Cr3+ site, Cr3+ is bonded to six Se2- atoms to form a mixture of edge and corner-sharing CrSe6 octahedra. The corner-sharing octahedral tilt angles are 49°. There are four shorter (2.53 Å) and two longer (2.57 Å) Cr–Se bond lengths. In the second Cr3+ site, Cr3+ is bonded to six Se2- atoms to form a mixture of edge and corner-sharing CrSe6 octahedra. The corner-sharing octahedral tilt angles are 50°. All Cr–Se bond lengths are 2.56 Å. In the third Cr3+ site, Cr3+ is bonded to six Se2- atoms to form a mixture of edge, corner, and face-sharing CrSe6 octahedra. The corner-sharing octahedra tilt angles range from 48–50°. There are a spread of Cr–Se bond distances ranging from 2.50–2.60 Å. In the fourth Cr3+ site, Cr3+ is bonded to six Se2- atoms to form a mixture of edge, corner, and face-sharing CrSe6 octahedra. The corner-sharing octahedral tilt angles are 48°. There are a spread of Cr–Se bond distances ranging from 2.50–2.67 Å. Tl1+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of Tl–Se bond distances ranging from 3.33–3.76 Å. There are five inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a distorted rectangular see-saw-like geometry to four Cr3+ and one Tl1+ atom. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to three Cr3+ and three equivalent Tl1+ atoms. In the third Se2- site, Se2- is bonded to five Cr3+ atoms to form a mixture of distorted edge and corner-sharing SeCr5 square pyramids. In the fourth Se2- site, Se2- is bonded in a 5-coordinate geometry to three equivalent Cr3+ and two equivalent Tl1+ atoms. In the fifth Se2- site, Se2- is bonded in a 5-coordinate geometry to three Cr3+ and two equivalent Tl1+ atoms.

36 MATERIALS SCIENCE↗