DOI: 10.17188/1691377
title: Materials Data on Ta6Cr3Ni3C2 by Materials Project

description: Ta6Cr3Ni3C2 crystallizes in the orthorhombic Imm2 space group. The structure is three-dimensional. there are six inequivalent Ta sites. In the first Ta site, Ta is bonded in a 2-coordinate geometry to four Cr, two equivalent Ni, and two equivalent C atoms. There are two shorter (2.84 Å) and two longer (2.89 Å) Ta–Cr bond lengths. Both Ta–Ni bond lengths are 2.75 Å. Both Ta–C bond lengths are 2.20 Å. In the second Ta site, Ta is bonded in a 2-coordinate geometry to two equivalent Cr, four Ni, and two equivalent C atoms. Both Ta–Cr bond lengths are 2.91 Å. There are two shorter (2.78 Å) and two longer (2.89 Å) Ta–Ni bond lengths. Both Ta–C bond lengths are 2.15 Å. In the third Ta site, Ta is bonded in a 2-coordinate geometry to three Cr, three Ni, and two C atoms. There are two shorter (2.88 Å) and one longer (2.91 Å) Ta–Cr bond lengths. There are two shorter (2.77 Å) and one longer (2.90 Å) Ta–Ni bond lengths. Both Ta–C bond lengths are 2.17 Å. In the fourth Ta site, Ta is bonded in a distorted bent 150 degrees geometry to two equivalent Cr, four Ni, and two equivalent C atoms. Both Ta–Cr bond lengths are 2.92 Å. There are two shorter (2.76 Å) and two longer (2.92 Å) Ta–Ni bond lengths. Both Ta–C bond lengths are 2.16 Å. In the fifth Ta site, Ta is bonded in a distorted bent 150 degrees geometry to four Cr, two equivalent Ni, and two equivalent C atoms. There are two shorter (2.82 Å) and two longer (2.90 Å) Ta–Cr bond lengths. Both Ta–Ni bond lengths are 2.89 Å. Both Ta–C bond lengths are 2.16 Å. In the sixth Ta site, Ta is bonded in a 2-coordinate geometry to three Cr, three Ni, and two C atoms. There are a spread of Ta–Cr bond distances ranging from 2.81–2.91 Å. There are a spread of Ta–Ni bond distances ranging from 2.77–2.91 Å. There are one shorter (2.16 Å) and one longer (2.17 Å) Ta–C bond lengths. There are three inequivalent Cr sites. In the first Cr site, Cr is bonded to six Ta, one Cr, and five Ni atoms to form distorted CrTa6CrNi5 cuboctahedra that share corners with three equivalent CrTa6Cr4Ni2 cuboctahedra, edges with six CTa6 octahedra, and faces with eight CrTa6CrNi5 cuboctahedra. The Cr–Cr bond length is 2.45 Å. There are three shorter (2.43 Å) and two longer (2.47 Å) Cr–Ni bond lengths. In the second Cr site, Cr is bonded to six Ta, two equivalent Cr, and four Ni atoms to form distorted CrTa6Cr2Ni4 cuboctahedra that share edges with six CTa6 octahedra and faces with eight CrTa6CrNi5 cuboctahedra. Both Cr–Cr bond lengths are 2.41 Å. There are one shorter (2.45 Å) and three longer (2.46 Å) Cr–Ni bond lengths. In the third Cr site, Cr is bonded to six Ta, four Cr, and two equivalent Ni atoms to form distorted CrTa6Cr4Ni2 cuboctahedra that share corners with four CrTa6CrNi5 cuboctahedra, corners with three equivalent CTa6 octahedra, faces with five CrTa6CrNi5 cuboctahedra, and faces with three CTa6 octahedra. The corner-sharing octahedra tilt angles range from 43–44°. The Cr–Cr bond length is 2.50 Å. Both Cr–Ni bond lengths are 2.52 Å. There are three inequivalent Ni sites. In the first Ni site, Ni is bonded in a 12-coordinate geometry to six Ta, five Cr, and one Ni atom. The Ni–Ni bond length is 2.54 Å. In the second Ni site, Ni is bonded in a 12-coordinate geometry to six Ta, three Cr, and three Ni atoms. There are two shorter (2.56 Å) and one longer (2.58 Å) Ni–Ni bond lengths. In the third Ni site, Ni is bonded in a 12-coordinate geometry to six Ta, three Cr, and three Ni atoms. The Ni–Ni bond length is 2.55 Å. There are two inequivalent C sites. In the first C site, C is bonded to six Ta atoms to form CTa6 octahedra that share corners with three equivalent CrTa6Cr4Ni2 cuboctahedra, corners with six CTa6 octahedra, edges with six CrTa6CrNi5 cuboctahedra, and a faceface with one CrTa6Cr4Ni2 cuboctahedra. The corner-sharing octahedra tilt angles range from 42–44°. In the second C site, C is bonded to six Ta atoms to form CTa6 octahedra that share corners with six CTa6 octahedra, edges with six CrTa6CrNi5 cuboctahedra, and faces with two equivalent CrTa6Cr4Ni2 cuboctahedra. The corner-sharing octahedra tilt angles range from 42–43°.