CoNi2Sn crystallizes in the trigonal P3m1 space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to one Co(3), one Ni(5), three equivalent Ni(1), three equivalent Ni(3), three equivalent Ni(6), and three equivalent Sn(2) atoms. In the second Co site, Co(2) is bonded in a 14-coordinate geometry to one Co(3), one Ni(5), three equivalent Ni(2), three equivalent Ni(4), three equivalent Sn(1), and three equivalent Sn(3) atoms. In the third Co site, Co(3) is bonded in a 14-coordinate geometry to one Co(1), one Co(2), three equivalent Ni(1), three equivalent Ni(4), three equivalent Sn(1), and three equivalent Sn(2) atoms. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 11-coordinate geometry to three equivalent Co(1), three equivalent Co(3), one Ni(6), one Sn(1), and three equivalent Sn(2) atoms. In the second Ni site, Ni(2) is bonded in a 11-coordinate geometry to three equivalent Co(2), one Ni(6), three equivalent Ni(5), one Sn(1), and three equivalent Sn(3) atoms. In the third Ni site, Ni(3) is bonded in a 11-coordinate geometry to three equivalent Co(1), three equivalent Ni(5), three equivalent Ni(6), one Sn(2), and one Sn(3) atom. In the fourth Ni site, Ni(4) is bonded in a 11-coordinate geometry to three equivalent Co(2), three equivalent Co(3), one Sn(2), one Sn(3), and three equivalent Sn(1) atoms. In the fifth Ni site, Ni(5) is bonded in a 14-coordinate geometry to one Co(1), one Co(2), three equivalent Ni(2), three equivalent Ni(3), three equivalent Ni(6), and three equivalent Sn(3) atoms. In the sixth Ni site, Ni(6) is bonded in a 11-coordinate geometry to three equivalent Co(1), one Ni(1), one Ni(2), three equivalent Ni(3), and three equivalent Ni(5) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 11-coordinate geometry to three equivalent Co(2), three equivalent Co(3), one Ni(1), one Ni(2), and three equivalent Ni(4) atoms. In the second Sn site, Sn(2) is bonded in a 11-coordinate geometry to three equivalent Co(1), three equivalent Co(3), one Ni(3), one Ni(4), and three equivalent Ni(1) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to three equivalent Co(2), one Ni(3), one Ni(4), three equivalent Ni(2), and three equivalent Ni(5) atoms.
CoNi2Sn crystallizes in the trigonal P3m1 space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to one Co(3), one Ni(5), three equivalent Ni(1), three equivalent Ni(3), three equivalent Ni(6), and three equivalent Sn(2) atoms. The Co(1)-Co(3) bond length is 2.63 Å. The Co(1)-Ni(5) bond length is 2.37 Å. All Co(1)-Ni(1) bond lengths are 2.75 Å. All Co(1)-Ni(3) bond lengths are 2.69 Å. All Co(1)-Ni(6) bond lengths are 2.68 Å. All Co(1)-Sn(2) bond lengths are 2.79 Å. In the second Co site, Co(2) is bonded in a 14-coordinate geometry to one Co(3), one Ni(5), three equivalent Ni(2), three equivalent Ni(4), three equivalent Sn(1), and three equivalent Sn(3) atoms. The Co(2)-Co(3) bond length is 2.66 Å. The Co(2)-Ni(5) bond length is 2.66 Å. All Co(2)-Ni(2) bond lengths are 2.81 Å. All Co(2)-Ni(4) bond lengths are 2.75 Å. All Co(2)-Sn(1) bond lengths are 2.75 Å. All Co(2)-Sn(3) bond lengths are 2.76 Å. In the third Co site, Co(3) is bonded in a 14-coordinate geometry to one Co(1), one Co(2), three equivalent Ni(1), three equivalent Ni(4), three equivalent Sn(1), and three equivalent Sn(2) atoms. All Co(3)-Ni(1) bond lengths are 2.77 Å. All Co(3)-Ni(4) bond lengths are 2.78 Å. All Co(3)-Sn(1) bond lengths are 2.78 Å. All Co(3)-Sn(2) bond lengths are 2.73 Å. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 11-coordinate geometry to three equivalent Co(1), three equivalent Co(3), one Ni(6), one Sn(1), and three equivalent Sn(2) atoms. The Ni(1)-Ni(6) bond length is 2.43 Å. The Ni(1)-Sn(1) bond length is 2.71 Å. All Ni(1)-Sn(2) bond lengths are 2.43 Å. In the second Ni site, Ni(2) is bonded in a 11-coordinate geometry to three equivalent Co(2), one Ni(6), three equivalent Ni(5), one Sn(1), and three equivalent Sn(3) atoms. The Ni(2)-Ni(6) bond length is 2.46 Å. All Ni(2)-Ni(5) bond lengths are 2.72 Å. The Ni(2)-Sn(1) bond length is 2.73 Å. All Ni(2)-Sn(3) bond lengths are 2.43 Å. In the third Ni site, Ni(3) is bonded in a 11-coordinate geometry to three equivalent Co(1), three equivalent Ni(5), three equivalent Ni(6), one Sn(2), and one Sn(3) atom. All Ni(3)-Ni(5) bond lengths are 2.71 Å. All Ni(3)-Ni(6) bond lengths are 2.42 Å. The Ni(3)-Sn(2) bond length is 2.54 Å. The Ni(3)-Sn(3) bond length is 2.55 Å. In the fourth Ni site, Ni(4) is bonded in a 11-coordinate geometry to three equivalent Co(2), three equivalent Co(3), one Sn(2), one Sn(3), and three equivalent Sn(1) atoms. The Ni(4)-Sn(2) bond length is 2.62 Å. The Ni(4)-Sn(3) bond length is 2.61 Å. All Ni(4)-Sn(1) bond lengths are 2.42 Å. In the fifth Ni site, Ni(5) is bonded in a 14-coordinate geometry to one Co(1), one Co(2), three equivalent Ni(2), three equivalent Ni(3), three equivalent Ni(6), and three equivalent Sn(3) atoms. All Ni(5)-Ni(6) bond lengths are 2.72 Å. All Ni(5)-Sn(3) bond lengths are 2.77 Å. In the sixth Ni site, Ni(6) is bonded in a 11-coordinate geometry to three equivalent Co(1), one Ni(1), one Ni(2), three equivalent Ni(3), and three equivalent Ni(5) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 11-coordinate geometry to three equivalent Co(2), three equivalent Co(3), one Ni(1), one Ni(2), and three equivalent Ni(4) atoms. In the second Sn site, Sn(2) is bonded in a 11-coordinate geometry to three equivalent Co(1), three equivalent Co(3), one Ni(3), one Ni(4), and three equivalent Ni(1) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to three equivalent Co(2), one Ni(3), one Ni(4), three equivalent Ni(2), and three equivalent Ni(5) atoms.