Heptaserebrodicalcium - a binary inorganic compound of silver and calcium with the formula Ca 2 Ag 7 , crystals.
| Heptaserebrodicalcium | |
|---|---|
| Are common | |
| Systematic name | Heptaserebrodicalcium |
| Traditional names | Dicalcium heptasilver |
| Chem. formula | Ca 2 Ag 7 |
| Rat formula | Ag 7 Ca 2 |
| Physical properties | |
| condition | crystals |
| Molar mass | 835.23 g / mol |
| Density | 7.5 g / cm³ |
| Thermal properties | |
| T. melt. | 731 ° C |
| Enthalpy of Education | -13.4 [1] kJ / mol |
| Classification | |
| Reg. CAS number | 12399-47-2 |
Getting
- Fusion of stoichiometric amounts of pure substances:
Physical Properties
Heptaserebrodicalcium forms hexagonal crystals, space group P 6 3 22 , cell parameters a = 0.550 nm , c = 1.410 nm , Z = 2 [2] [3] [4] [5] .
The structure of a rhombic syngony , space group C mcm , cell parameters a = 0.9478 nm , b = 0.5525 nm , c = 1.4079 nm , Z = 4 are reported [6] .
The compound melts congruently at a temperature of 731 ° C (722 ° C [1] ).
Notes
- ↑ 1 2 P. Franke, D. Neuschütz. Ag-Ca (Silver - Calcium). Thermodynamic Properties of Inorganic Materials // Landolt-Börnstein - Group IV Physical Chemistry. - 2007.- T. 19B5 . - S. 1-4 . - DOI : 10.1007 / 978-3-540-45280-5_7 .
- ↑ State Diagrams of Double Metal Systems / Ed. N.P. Lyakisheva. - M .: Mechanical Engineering, 1996. - T. 1. - 992 p. - ISBN 5-217-02688-X .
- ↑ B. Predel. Ag-Ca (Silver - Calcium). Supplement // Landolt-Börnstein - Group IV Physical Chemistry. - 2006. - T. 12A . - S. 1-2 . - DOI : 10.1007 / 10793176_23 .
- ↑ B. Predel. Ag-Ca (Silver-Calcium) // Landolt-Börnstein - Group IV Physical Chemistry. - 1991 .-- T. 5a . - S. 1-2 . - DOI : 10.1007 / 10000866_17 .
- ↑ MR Baren. The Ag − Ca (Silver-Calcium) system // Bulletin of Alloy Phase Diagrams. - 1988. - T. 9 , No. 3 . - S. 228-231 . - DOI : 10.1007 / BF02881269 .
- ↑ G. Jeffrey Snyder, Arndt Simon. Crystal structure of Ag 7 Ca 2 - a new intermetallic structure type // Journal of Alloys and Compounds. - 1995. - T. 223 , No. 1 . - S. 65-69 . - DOI : 10.1016 / 0925-8388 (94) 01485-X .