User:Graeme Bartlett/carbosulfide
Carbosulfides, sulfocarbides or carbide sulfides or sulfide carbides are compounds containing anions composed of carbide (C4−) and sulfide (S2−). They can be considered as mixed anion compounds. Related compounds include the carboselenides, carbotellurides and silicide sulfides.
Two major types of transition metal carbosulfides exist. Those with equal carbon and sulfur, resemble carbides in hardness and stability. Carbosulfides wtih twice as much sulfur (CS2) have a layered structure similar to transition metal dichalcogenides.[1] The layered compounds can be used as lubricants, exfoliated to monolayers, or intercallated with other substances. They are superconductors with two transition temperatures.[2]
Use
In nickel-based superalloys, carbosulfides can sequestor sulfur.[3]
List
| formula | system | space group | unit cell Å | volume | density | comment | ref |
|---|---|---|---|---|---|---|---|
| Ti2CS | [1] | ||||||
| V1.2Ti0.8CS | is unstable with more V | [1] | |||||
| Zr2CS | [1] | ||||||
| Nb2CS | hexagonal | P63/mmc | a=3.31 c=11.5 | C varies from 0.66 to 1 superconductor under 5K |
[1][4] | ||
| 1s-Nb2S2C | superconductor Tc=7.6 K | [1][5] | |||||
| 3s-Nb2S2C | [1] | ||||||
| Hf2CS | hexagonal | P63/mmc | [1] | ||||
| 1s-Ta2S2C | hexagonal | P3m1 | layered; lubricant, Superconductor Tc=8.9K | [1] | |||
| 3s-Ta2S2C | R3m | high temp modification | [1] | ||||
| 3R-Fe0.33Ta2S2C | superconductor Tc=8.8K | [2] | |||||
| 3R-Co0.33Ta2S2C | superconductor Tc=9.1K | [2] | |||||
| 3R-Ni0.25Ta2S2C | superconductor Tc=8.7K | [2] | |||||
| 1T-Cu0.60Ta2S2C | superconductor Tc=6.4K | [2] | |||||
| triclinic | P1 | ||||||
| monoclinic | P21 |
References
- ^ a b c d e f g h i j Wally, Pablo; Ueki, Masanori (July 1998). "Combustion Synthesis of Transition Metal Carbosulfides". Journal of Solid State Chemistry. 138 (2): 250–259. doi:10.1006/jssc.1998.7779.
- ^ a b c d e Suzuki, Masatsugu; Suzuki, Itsuko S.; Walter, Jürgen (2005-06-03). "Magnetism and superconductivity in M c Ta 2 S 2 C ( M = Fe , Co, Ni, and Cu)". Physical Review B. 71 (22): 224407. doi:10.1103/PhysRevB.71.224407. ISSN 1098-0121.
- ^ Whelan, E. P.; Grzedzielski, M. S. (January 1974). "H-phase sulphocarbides and sulphur in nickel-base superalloys". Metals Technology. 1 (1): 186–190. doi:10.1179/030716974803288040.
- ^ Beckmann, O.; Boller, H.; Nowotny, H. (1968). "Neue H-Phasen: Kurze Mitteilung". Monatshefte für Chemie. 99 (4): 1580–1583. doi:10.1007/bf00902709.
- ^ Sakamaki, K.; Wada, H.; Nozaki, H.; Ōnuki, Y.; Kawai, Maki (April 2001). "van der Waals type carbosulfide superconductor". Solid State Communications. 118 (3): 113–118. doi:10.1016/S0038-1098(01)00071-0.