Aluminum palladium - a binary inorganic compound of palladium and aluminum with the formula PdAl, crystals.
| Aluminum palladium | |
|---|---|
| Are common | |
| Systematic name | Aluminum palladium |
| Traditional names | Palladium Aluminide |
| Chem. formula | Pdal |
| Rat formula | Alpd |
| Physical properties | |
| condition | crystals |
| Molar mass | 133.40 g / mol |
| Density | 7.9 g / cm³ |
| Thermal properties | |
| T. melt. | 1645 [1] |
| Enthalpy of Education | -452 [2] kJ / mol |
| Classification | |
| Reg. CAS number | 12003-88-2 |
Getting
- Fusion of stoichiometric amounts of pure substances:
Physical Properties
Aluminum palladium forms crystals of several modifications [1] :
- high temperature phase, cubic syngony , space group P m 3 m , cell parameters a = 0.3036 nm, Z = 1, cesium chloride type structure [3] , exists in the temperature range 850–1645 ° С;
- low temperature phase, trigonal syngony , space group R 3 , cell parameters a = 1.5659 nm, c = 0.5251 nm (according to other sources, hexagonal syngony cell parameters a = 0.3951 nm, c = 0.5603 nm), there is at temperatures below 850 ° C;
- phase with an excess of aluminum up to 50.7 at.%, cubic syngony , space group P 2 1 3 , cell parameters a = 0.4862 nm, Z = 4. structure like iron silicide , exists at a temperature below ≈760 ° С.
The compound melts congruently at a temperature of 1645 ° C [1] .
Notes
- ↑ 1 2 3 State Diagrams of Double Metal Systems / Ed. N.P. Lyakisheva. - M .: Mechanical Engineering, 1996. - T. 1. - 992 p. - ISBN 5-217-02688-X .
- ↑ David L. Cocke, Karl A. Gingerich, Chin-An Chang. Atomization energies of gaseous AlPd and Al 2 Pd // J. Chem. Soc .. - 1976 .-- T. 72 . - S. 268-272 . - DOI : 10.1039 / F19767200268 .
- ↑ Chemist's Handbook / Editorial: Nikolsky B.P. et al. - 2nd ed., rev. - M.-L.: Chemistry, 1966. - T. 1. - 1072 p.