Magnetic characterization of a hydrogen phase trapped inside deep dislocation cores in a hydrogen-cycled PdH{sub x} (x {approx} 4.5 x 10{sup -4}) single crystal
- University of Illinois at Urbana-Champaign, Department of Nuclear, Plasma and Radiological Engineering (United States)
- Russian Academy of Sciences, Institute of Physical Chemistry and Electrochemistry (Russian Federation)
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{sub x} (x = H/Pd {approx} 4.5 x 10{sup -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{sub x} sample at T < 30 K resulting in the presence of the hydrogen phase. It is suggested that the anomalous diamagnetic response in PdH{sub x} is caused by the presence of a hydrogen dominant phase, tightly bound with a Pd matrix inside the dislocation cores (nanotubes)
- OSTI ID:
- 21067641
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 103, Issue 3; Other Information: DOI: 10.1134/S1063776106090081; Copyright (c) 2006 Nauka/Interperiodica; Article Copyright (c) 2006 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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