User:Graeme Bartlett/carbosulfide
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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 | ||||||