Heptachrome octasulfide is an inorganic compound of sulfur and chromium with the formula Cr 7 S 8 , crystals.
| Heptachrome octasulfide | |
|---|---|
| Are common | |
| Systematic name | Heptachrome octasulfide |
| Traditional names | Chrome Sulfur |
| Chem. formula | Cr 7 S 8 |
| Physical properties | |
| condition | crystals |
| Molar mass | 620.49 g / mol |
| Thermal properties | |
| T. decomp. | ≈320 ° C |
| Classification | |
| Reg. CAS number | 12186-08-2 |
Getting
- Fusion of stoichiometric amounts of pure substances:
Physical Properties
Heptachrome octasulfide forms crystals with randomly distributed vacancies, hexagonal syngony , cell parameters a = 0.3459 nm , c = 0.5761 nm , Z = ≈1 / 3 [1] [2] .
The compound is formed by a peritectoid reaction at a temperature of ≈320 ° C.
Notes
- ↑ State Diagrams of Double Metal Systems / Ed. N.P. Lyakisheva. - M .: Metallurgy, 1997 .-- T. 2 .-- 1024 p. - ISBN 5-217-01569-1 .
- ↑ B. Predel. Cr-S (Chromium-Sulfur) // Landolt-Börnstein - Group IV Physical Chemistry. - 1994 .-- T. 5d . - S. 1-6 . - DOI : 10.1007 / 10086090_1010 .