Dicalcium heptanikel is a binary inorganic compound of nickel and calcium with the formula Ca 2 Ni 7 , crystals.
| Dicalciumheptanickel | |
|---|---|
| Are common | |
| Systematic name | Dicalciumheptanickel |
| Traditional names | Heptanikeldicalcium |
| Chem. formula | Ca 2 Ni 7 |
| Rac formula | Ni 7 Ca 2 |
| Physical properties | |
| condition | crystals |
| Molar mass | 491.01 g / mol |
| Density | 6.2 g / cm³ |
| Thermal properties | |
| T. | 1127 [1] ; 1187 [2] ° C |
Getting
- Fusion of stoichiometric amounts of pure substances [3] :
Physical Properties
Dicalcium heptanikel forms crystals of the trigonal syngony , space group R 3m , cell parameters a = 0.5009 nm, c = 3.606 nm, Z = 6, the structure of the dierbium heptacobalt type Co 7 Er 2 [2] [4] [5] .
The compound is formed by the peritectic reaction at a temperature of 1187 ° C.
Notes
- ↑ H. Okamoto. Ca-Ni (Calcium-Nickel) // Journal of Phase Equilibria and Diffusion. - 2007. - T. 28 , No. 3 . - p . 299 . - DOI : 10.1007 / s11669-007-9054-5 .
- ↑ 1 2 State diagrams of double metallic systems / Ed. N. P. Lyakishev. - M .: Mashinostroenie, 1996. - T. 1. - 992 p. - ISBN 5-217-02688-X .
- ↑ D. Uremovich, F. Islam, M. Medraj. Thermodynamic modeling of the Ca – Ni system // Science and Technology of Advanced Materials. - 2006. - T. 7 . - pp . 119–126 .
- ↑ B. Predel. Ca-Ni (Calcium-Nickel) // Landolt-Börnstein - Group IV Physical Chemistry. - 1993. - T. 5c . - p . 1-4 . - DOI : 10.1007 / 10086082_712 .
- ↑ CC Addison. Inorganic Chemistry of the Main-Group Elements . - The Chemistry Society. - T. 4.