Experiments of deuterium absorption/desorption were performed on a foil of Pd77Ag23(wt%) alloy in the 78–196ï¿½ï¿½C temperature and 1–4ï¿½bar pressure ranges under the neutron beam at ILL (Grenoble). Powder diffraction patterns were collected on the D1B diffractometer (λï¿½=ï¿½1.2871ï¿½ï¿½) on the Pd0.772Ag0.228Dνdeuterated alloy, and the face-centred-cubic structure was Rietveld-refined locating the D atom in the octahedral site with a variable occupancy ν (=D/M ratio). The results of ν(T) curves at different p(D2) pressures are discussed in comparison with literature data on H and D absorption into Pd[sbnd]Ag alloys from thermodynamic measurements. A negative deviation from predictions of Sieverts' law is shown by the dependence of D occupancy on pressure. This effect relates the behaviour of the activity coefficient γDto D–D and D–M interactions in the solid solution phase.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology