Published August 9, 2006 | Version v1
Journal article Metadata-only

Evidence for a two-site localized hydrogen motion in C15-type YMn2Hx

Creators

  • 1. Institute of Metal Physics, Urals Branch of the Academy of Sciences, Ekaterinburg 620041 (Russian Federation)
  • 2. Institut Laue-Langevin, F-38042 Grenoble (France)
  • 3. Institut fuer Physikalische Chemie, Universitaet des Saarlandes, D-66041 Saarbruecken (Germany)

Description

In order to clarify the mechanism of the fast localized motion of hydrogen in the cubic (C15-type) Laves phase YMn2, we have performed quasielastic neutron scattering measurements in YMn2Hx (x = 0.6 and 1.2) over the temperature range 10-376 K. The behaviour of the elastic incoherent structure factor as a function of momentum transfer (studied up to Qmax∼3 A-1) is consistent with the two-site motion of H atoms within pairs of closely spaced interstitial g (Y2Mn2) sites. Comparison of the data for YMn2H0.6 and YMn2H1.2 shows that both the hydrogen jump rate and the fraction of H atoms participating in the fast localized motion decrease with increasing H content

Availability note (English)

Available online at http://stacks.iop.org/0953-8984/18/7249/cm6_31_019.pdf or at the Web site for the Journal of Physics. Condensed Matter (ISSN 1361-648X) http://www.iop.org/

Additional details

Identifiers

URL
http://stacks.iop.org/0953-8984/18/7249/cm6_31_019.pdf; http://www.iop.org/;
DOI
10.1088/0953-8984/18/31/019;
PII
S0953-8984(06)23083-2;

Publishing Information

Journal Title
Journal of Physics. Condensed Matter
Journal Volume
18
Journal Issue
31
Journal Page Range
p. 7249-7256
ISSN
0953-8984
CODEN
JCOMEL

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
38012564
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
ATOMS; COMPARATIVE EVALUATIONS; CUBIC LATTICES; HYDROGEN; LAVES PHASES; MANGANESE HYDRIDES; MOMENTUM TRANSFER; QUASI-ELASTIC SCATTERING; STRUCTURE FACTORS; TEMPERATURE DEPENDENCE; YTTRIUM COMPOUNDS
Descriptors DEC
CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIMENSIONLESS NUMBERS; DIRECT REACTIONS; ELEMENTS; EVALUATION; HYDRIDES; HYDROGEN COMPOUNDS; MANGANESE COMPOUNDS; NONMETALS; NUCLEAR REACTIONS; QUASI-FREE REACTIONS; SCATTERING; TRANSITION ELEMENT COMPOUNDS