Hydrogen migration in electron irradiated Pd based dilute alloys around the 50 K anomaly
2004
Abstract The migration of hydrogen in Pd–1 at.% Fe–H and Pd–1 at.% Ag–H alloys is investigated by electrical resistivity measurement around 50 K. The disordered hydrogen atoms are introduced by electron irradiation with 0.5 MeV electrons below 15 K. The disordered atoms order by migration of hydrogen atoms during the heating-up of the specimens. The recovery curves of electrical resistivity have two sub-stages for electron irradiated specimens and one stage for fast cooled specimens. The migration energy of hydrogen is obtained from the kinetic analysis of the resistivity change due to the ordering, using the cross-cut method for the electron irradiated specimen and fast cooled specimen. The obtained value of the migration energy for the low temperature stage is smaller than that for the high temperature stage. The value for the high temperature stage is similar to the energy for the case of fast cooling. The difference between the hydrogen atoms disordered by irradiation and that by fast cooling is discussed for Pd based alloys.
Keywords:
- Electrical resistance and conductance
- Nuclear magnetic resonance
- Radiochemistry
- Hydrogen
- Crystallographic defect
- Atom
- Interstitial compound
- Electrical resistivity and conductivity
- Hydrogen atom
- Chemistry
- Condensed matter physics
- Electron beam processing
- Irradiation
- Analytical chemistry
- Metallurgy
- Electron
- Materials science
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