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

A. G. Lipson, B. J. Heuser, C. H. Castano, B. F. Lyakhov, A. Yu Tsivadze

Research output: Contribution to journalArticlepeer-review

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).

Original languageEnglish (US)
Pages (from-to)385-397
Number of pages13
JournalJournal of Experimental and Theoretical Physics
Volume103
Issue number3
DOIs
StatePublished - Sep 1 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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