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Magnetic characterization of a hydrogen phase trapped inside deep dislocation cores in a hydrogen-cycled PdH x (x ≈ 4.5 × 10−4) single crystal

  • Order, Disorder, and Phase Transitions in Condensed Systems
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Abstract

The magnetic characterization of Pd single crystals deformed by cycling in a hydrogen atmosphere has been performed. Based on evidence obtained from thermal desorption analysis, it is shown that the condensed hydrogen phase formed inside deep dislocation cores in PdH x (x = H/Pd ≈ 4.5 × 10−4) is tightly bound with a Pd matrix. The activation energy of hydrogen desorption from these cores was found to be as high as e = 1.6eV/H-atom, suggesting the occurrence of a strong band overlapping between Pd and H atoms. SQUID measurements carried out in a weak magnetic field (H < 5.0 Oe) showed an anomalous diamagnetic contribution to the DC and AC magnetic susceptibilities of the PdH x sample at T < 30 K resulting in the presence of the hydrogen phase. It is suggested that the anomalous diamagnetic response in PdH x is caused by the presence of a hydrogen dominant phase, tightly bound with a Pd matrix inside the dislocation cores (nanotubes).

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Authors and Affiliations

  1. Department of Nuclear, Plasma and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

    A. G. Lipson, B. J. Heuser & C. H. Castano

  2. Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119991, Russia

    A. G. Lipson, B. F. Lyakhov & A. Yu. Tsivadze

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  1. A. G. Lipson
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  2. B. J. Heuser
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  3. C. H. Castano
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  4. B. F. Lyakhov
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  5. A. Yu. Tsivadze
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Lipson, A.G., Heuser, B.J., Castano, C.H. et al. Magnetic characterization of a hydrogen phase trapped inside deep dislocation cores in a hydrogen-cycled PdH x (x ≈ 4.5 × 10−4) single crystal. J. Exp. Theor. Phys. 103, 385–397 (2006). https://doi.org/10.1134/S1063776106090081

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  • DOI: https://doi.org/10.1134/S1063776106090081

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