A chemical reaction strongly dependent upon the degree of order of an alloy: The absorption of hydrogen by Pd3Fe
- 1 January 1972
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 25 (1) , 257-262
- https://doi.org/10.1080/14786437208229233
Abstract
The magnitudes of the interstitial hydrogen content of Pd3Fe alloys have been investigated as a function of pressure. Since the alloy, Pd3Fe, does not absorb hydrogen at ≤ 1 atm. (25°c), high pressures were needed to introduce measurable amounts of hydrogen. It was found, for example, that a Pd3Fe alloy with long-range order attains a value of 3·5 for the ratio of its electrical resistance to its hydrogen-free value at 1000 atm. H2, whereas this ratio for the disordered alloy is 1·1 (25°c). The respective hydrogen contents (lower limits), expressed as H-to-metal (atomic ratio), corresponding to this pressure are 0·167 and 0·035. This marked difference in the behaviour of the alloys is attributed to the occupation of a unique interstitial site in the ordered alloy; this site is at the centre of the f.c.c. unit cell and has only palladium atoms as its nearest neighbours.Keywords
This publication has 15 references indexed in Scilit:
- The volume increase of fcc metals and alloys due to interstitial hydrogen over a wide range of hydrogen contentsJournal of Physics F: Metal Physics, 1971
- Remarkable interstitial hydrogen contents observed in rhodium-palladium alloys at high pressuresThe Journal of Physical Chemistry, 1970
- Theoretical aspects of the absorption of hydrogen by palladium and its alloys. Part 1.—A reassessment and comparison of the various proton modelsTransactions of the Faraday Society, 1970
- The Electrical Resistance of Palladium and Palladium–Gold Alloy (50 wt% Au and Pd) in Gaseous Hydrogen up to 24000 at at 25 °CPhysica Status Solidi (b), 1969
- Temperature Dependence of thehfs in the Ordered Alloys Feand FePd near the Curie TemperaturePhysical Review B, 1968
- The electrical resistance of palladium at high pressures of gaseous hydrogen at room temperatureJournal of Physics and Chemistry of Solids, 1968
- A neutron-diffraction study of the α phase in the palladium–gold–hydrogen and palladium–gold–deuterium systemsCanadian Journal of Physics, 1968
- Application of the electron-donation model for hydrogen absorption to palladium-rich alloys. Hydrogen-gold-palladiumThe Journal of Physical Chemistry, 1968
- Low temperature specific heat of transition metals and alloysZeitschrift für Physik B Condensed Matter, 1966
- Wasserstoff in Palladium/Silber-LegierungenZeitschrift für Physikalische Chemie, 1965