Title
Hydrogen absorption effects in the Zr(Fe<inf>0.5</inf>Cr<inf>0.5</inf>)<inf>2</inf> compound
Date Issued
01 December 2000
Access level
metadata only access
Resource Type
conference paper
Author(s)
Universidade de São Paulo
Publisher(s)
Springer Nature
Abstract
Zr(Fe0.5Cr0.5)2 Laves phase samples have been made to absorb different hydrogen amounts up to 3.3 H/f.u. XRD showed all ZrFeCrHy samples to have the C14 structure and, for 0 < y < 2.6, to be composed of a H-poor α-phase and a H-rich β-phase having different c/a ratios. Both phases could be distinguished in the Mössbauer spectra. The β-phase fraction was determined both from X-ray and Mössbauer analysis, with excellent agreement. β-phase lattice constants and hyperfine parameters vs. y exhibited a small jump at y ≈ 1.75, suggesting a phase transition. Mössbauer spectra of ZrFeCrH3.3 in the 78350 K range revealed that, for Fe at the 6h site, quadrupole splitting and linewidth increased for decreasing temperature. These effects were attributed to H atomic jump diffusion, and an activation energy of ≈70 meV was estimated.
Start page
205
End page
210
Volume
126
Issue
April 1
Language
English
OCDE Knowledge area
Compuestos
Scopus EID
2-s2.0-0034454410
Source
Hyperfine Interactions
ISSN of the container
03043843
Sponsor(s)
This work was financially supported by FAPESP and CNPq.
Sources of information:
Directorio de Producción Científica
Scopus