期刊
PHYSICS LETTERS A
卷 373, 期 35, 页码 3101-3108出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2009.06.057
关键词
Palladium wire; Hydrogen cycles; Electrolysis; Resistivity; Stress; Strain
A series of hydrogenation/dehydrogenation cycles have been performed on palladium wire samples. stressed by a constant mechanical tension, in order to investigate the changes in electrical and mechanical properties. A large increase of palladium electrical resistivity has been reported due to the combined effects of the production of defects linked to hydrogen insertion into the host lattice and the stress applied to the sample. An increase of the palladium sample strain due to hydrogenation/dehydrogenation cycles in alpha -> beta -> alpha phase transitions is observed compared to the sample subjected to mechanical tension only. The loss of initial metallurgical properties of the sample occurs already after the first hydrogen cycle, i.e. a displacement from the initial metallic behavior (increase of the resistivity and decrease of thermal coefficient of resistivity) to a worse one occurs already after the first hydrogen cycle. A linear correlation between palladium resistivity and strain, according to Matthiessen's rule, has been found. (C) 2009 Elsevier B.V. All rights reserved.
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