Materials Data on TlCu4Se3 by Materials Project
TlCu4Se3 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Cu+1.25+ is bonded to four Se2- atoms to form a mixture of corner and edge-sharing CuSe4 tetrahedra. There are two shorter (2.43 Å) and two longer (2.53 Å) Cu–Se bond lengths. Tl1+ is bonded in a body-centered cubic geometry to eight equivalent Se2- atoms. All Tl–Se bond lengths are 3.36 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 8-coordinate geometry to four equivalent Cu+1.25+ and four equivalent Tl1+ atoms. In the second Se2- site, Se2- is bonded in a body-centered cubic geometry to eight equivalent Cu+1.25+ atoms.
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