Materials Data on Ta20Te5S3 by Materials Project
Ta20Te5S3 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are eleven inequivalent Ta sites. In the first Ta site, Ta is bonded to twelve Ta atoms to form TaTa12 cuboctahedra that share corners with two equivalent TaTa12 cuboctahedra, corners with two equivalent STa5 trigonal bipyramids, an edgeedge with one TaTa12 cuboctahedra, and a faceface with one TaTa12 cuboctahedra. There are a spread of Ta–Ta bond distances ranging from 2.73–3.16 Å. In the second Ta site, Ta is bonded in a single-bond geometry to two equivalent Ta and one S atom. The Ta–S bond length is 2.56 Å. In the third Ta site, Ta is bonded in a 1-coordinate geometry to one Te and two S atoms. The Ta–Te bond length is 2.85 Å. There are one shorter (2.51 Å) and one longer (2.75 Å) Ta–S bond lengths. In the fourth Ta site, Ta is bonded in a 1-coordinate geometry to one Ta, two Te, and one S atom. There are one shorter (2.79 Å) and one longer (2.98 Å) Ta–Te bond lengths. The Ta–S bond length is 2.55 Å. In the fifth Ta site, Ta is bonded in a distorted linear geometry to two equivalent Te atoms. Both Ta–Te bond lengths are 2.79 Å. In the sixth Ta site, Ta is bonded in a single-bond geometry to one Ta, one Te, and one S atom. The Ta–Te bond length is 3.19 Å. The Ta–S bond length is 2.47 Å. In the seventh Ta site, Ta is bonded in a 2-coordinate geometry to two equivalent Ta and two Te atoms. There are one shorter (2.79 Å) and one longer (2.91 Å) Ta–Te bond lengths. In the eighth Ta site, Ta is bonded in a 2-coordinate geometry to one Ta, one Te, and one S atom. The Ta–Te bond length is 2.84 Å. The Ta–S bond length is 2.48 Å. In the ninth Ta site, Ta is bonded in a 1-coordinate geometry to one Ta, one Te, and one S atom. The Ta–Te bond length is 2.96 Å. The Ta–S bond length is 2.49 Å. In the tenth Ta site, Ta is bonded in a single-bond geometry to three equivalent Ta and one S atom. The Ta–S bond length is 2.62 Å. In the eleventh Ta site, Ta is bonded in a 1-coordinate geometry to one Ta, two Te, and one S atom. There are one shorter (2.88 Å) and one longer (3.10 Å) Ta–Te bond lengths. The Ta–S bond length is 2.60 Å. There are three inequivalent Te sites. In the first Te site, Te is bonded in a 5-coordinate geometry to five Ta atoms. In the second Te site, Te is bonded in a 4-coordinate geometry to four Ta atoms. In the third Te site, Te is bonded in a 4-coordinate geometry to four Ta atoms. There are two inequivalent S sites. In the first S site, S is bonded in a 6-coordinate geometry to six Ta atoms. In the second S site, S is bonded to five Ta atoms to form distorted STa5 trigonal bipyramids that share corners with four equivalent TaTa12 cuboctahedra.