NMR studies of hydrogen motion in vacancies in Nb–H alloys

Proton NMR was measured in two Nb-H samples prepared so as to introduce vacancy-hydrogen (vac-H) clusters and a reference sample not containing vac-H clusters. A motionally narrowed signal persisting to very low temperatures was observed only in the former samples, and was assigned to protons execut...

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Published inJournal of physics. Condensed matter Vol. 16; no. 46; pp. 8191 - 8200
Main Authors Imai, Tadashi, Kayanuma, Akira, Fukai, Yuh, Masubuchi, Shin’ichi
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 24.11.2004
Institute of Physics
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Defects and impurities in crystals; microstructure
Exact sciences and technology
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Nuclear magnetic resonance and relaxation
Physics
Point defects (vacancies, interstitials, color centers, etc.) and defect clusters
Structure of solids and liquids; crystallography
Vacancies
Temperature effects
Hydrogen additions
Line widths
Nuclear magnetic resonance
Experimental study
Activation energy
Vacancy impurity pair
Niobium
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Summary:Proton NMR was measured in two Nb-H samples prepared so as to introduce vacancy-hydrogen (vac-H) clusters and a reference sample not containing vac-H clusters. A motionally narrowed signal persisting to very low temperatures was observed only in the former samples, and was assigned to protons executing a cage motion in Nb-atom vacancies. From the temperature dependence of the linewidth between 7 and 30 K, an apparent activation energy of 3.8 meV was deduced.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/16/46/006