NUKLEONIKA 2010, 55(1):35-39

 


THE INFLUENCE OF HYDROGEN CONCENTRATION ON POSITRON LIFETIME AND ELECTRICAL RESISTIVITY IN VANADIUM-HYDROGEN SYSTEMS



Ryszard Pietrzak, Roman Szatanik

Institute of Physics, Opole University, 48 Oleska Str., 45-052 Opole, Poland


Positron lifetime spectra and electrical resistivity of the vanadium-hydrogen systems with hydrogen concentration ranging from 0 to 0.29 at.H/at.V have been investigated. The range of hydrogen concentrations under investigation included the single alpha phase and a mixture of the alpha and beta phases of V-H system. The registered positron lifetime spectra were analysed by decomposition into two components. A distinct change in the annihilation parameters has been found after exceeding the boundary concentration of hydrogen in vanadium corresponding to the phase transition alpha --> (alpha + beta). Correlation of changes in the parameters of the positron lifetime spectrum and in the electrical resistivity resulting from the changes in hydrogen concentration, has been revealed.


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