# Nickel ternary chalcogenides

The Nickel ternary chalcogenides are a class of chemical compounds that contains nickel, a chalcogenide, and another element. Nickel forms a series of double nickel oxides with other elements, which may be termed "nickelates". These double nickel oxides are not listed on this page. There are also many well defined double compounds with sulfur, selenium and tellurium which are listed here.
| formula | name | colour | structure | production | references |
| NH$_4$NiS$_5$ | ammonium nickel sulphide | black | | NH$_4$ polysulfide+NiSO$_4$ | |
| K$_2$Ni$_3$S$_4$ | potassium nickel tetrasulfide | bronze yellow | Fddd a=10.023 b=26.074 c=5.704 | NiSO$_4$ K$_2$CO$_3$ S | |
| K$_2$Ni$_{11}$S$_{10}$ | potassium nickel decasulfide | dark metallic green | | NiO+KCNS | J. Milbauer |
| Na$_2$Ni$_3$S$_4$ | sodium nickel tetrasulfide | dark yellow | | NiSO$_4$ Na$_2$CO$_3$ S | R. Schneider |
| KNi$_2$S$_2$ | potassium dinickel disulfide | orange yellow | | Ni foil, S, K at 723K | |
| K$_2$Ni$_3$Se$_4$ | potassium nickel tetraselenide | gold | Fddd a=10.468 b=26.496 c=5.995 | | |
| KNi$_2$Se$_2$ | potassium dinickel diselenide | purple-red | I4/mmmtetragonal a=3.909, c=13.4142 | Ni foil, Se shot, K at 723K | |
| CsNi$_2$Se$_2$ | caesium dinickel diselenide | | tetragonal a=3.988, c=14.419 | heat elements | |
| TlNi$_2$Se$_2$ | Thallium dinickel diselenide | gold metallic | tetragonal | heat elements together in closed quartz tube | |
| Rb$_2$Ni$_3$S$_4$ | rubidium nickel tetrasulphide | metallic greenish gold | Fmmm orthorhombic a=9.901 Å, b=13.606 Å and c=5.861 Z=4 layered; ferromagnetic only after water immersion | | |
| Rb$_2$Ni$_3$Se$_4$ | rubidium nickel tetraselenide | golden metallic | Fddd orthorhombic a = 10.555 Å, b = 27.588 Å, c = 6.031 Å, Z = 8 layered; ferromagnetic only after water immersion | Rb$_2$CO$_3$ S Ni | |
| Cs$_2$Ni$_3$S$_4$ | cesium nickel tetrasulphide | greenish gold | Fmmm a=10.038 b=14.552 c=5.934 | | |
| Cs$_2$Ni$_3$S$_4$ | cesium nickel tetrasulphide | gold | Fmmm a=10.540 b=14.624 c=6.194 | | |
| Cs$_{0.9}$Ni$_{3.1}$Se$_3$ | | | Hexagonal P6$_3$/m a = 9.26301(4) Å and c = 4.34272(2) Å | quasi-one-dimensional electric conductor | |
| BaNi$_4$S$_5$ | Barium nickel pentasulfide | bronze yellow | | NiSO$_4$ K$_2$CO$_3$ S | R. Schneider; I. and L. Bellucci |
| Pb$_2$Ni$_3$S$_2$ | lead nickel disulfide | melt 790° | | PbS Ni | W Guertler; W Guertler H Schack |
| (Ni,Fe)$_9$S$_8$ | Pentlandite | bronze yellow melt 870 | | | T. Scheerer |
| Fe$_2$Ni$_2$S$_4$ | ferrous nickel tetrasulfide | melt 840 | | | K Bornemann |
| Fe$_2$Ni$_2$S$_3$ | ferrous nickel trisulfide | stable over 575°, melt 886, | | | K Bornemann |
| Fe$_3$Ni$_4$S$_5$ | ferrous nickel pentasulfide | | | below 575 | K Bornemann |
| Fe$_4$Ni$_2$S$_5$ | | | | | K Bornemann |
| Fe$_2$Ni$_3$S$_4$ | | | | | K Bornemann |
| Fe$_3$Ni$_4$S$_5$ | | | | | K Bornemann |
| Fe$_2$Ni$_2$S$_3$ | | | | | K Bornemann |
| FeNi$_2$S$_4$ | Violarite | dark violet grey | | mineral oxidate | |
| Ni$_3$Sn$_2$S$_2$ | | | | | |
| Ni$_3$Bi$_2$S$_2$ | | | | superconducting | |
| Ni$_3$Bi$_2$Se$_2$ | | | | superconducting | |
| NiSnS$_3$ | nickel thiostannate | greenish black | orthorhombic a=6.88 b=7.89 c=11.95 Z=8 V=644 | NiCl$_2$ + SnS$_2$ | |
| NiGeS3$_3$ | nickelselenogermanate | | | | |
| Ta$_2$NiS$_5$ | | | Orthorhombic | | |
| Ta$_2$NiSe$_5$ | | | monoclinic β=90.53 | | |
| Ta$_2$Ni$_2$Te$_4$ | | | | | |
| Ta$_2$Ni$_3$Te$_5$ | | | | | |