TY - JOUR
T1 - EXAFS study of LaNi5 and LaNi4.5Al0.5
AU - Palumbo, O.
AU - Castellano, C.
AU - Paolone, A.
AU - Cordero, F.
AU - Cantelli, R.
AU - Nakamura, Y.
AU - Akiba, E.
N1 - Funding Information:
We thank K. Klementiev for technical support at HASYLAB. This work was supported by the European Community - Research Infrastructure Action under the FP6 “Structuring the European Research Area” Programme (through the Integrated Infrastructure Initiative “Integrating Activity on Synchrotron and Free Electron Laser Science”), Contract RII3-CT-2004-506008.
PY - 2007/5/16
Y1 - 2007/5/16
N2 - We report extended X-ray absorption fine structure measurements in the temperature range between 20 and 300 K at the Ni K absorption edge on LaNi5 and LaNi4.5Al0.5 before and after hydrogen charging. In agreement with previous studies, an increase of the Ni-Ni distance has been found when Ni atoms are partially substituted by Al. For all the samples, the Debye-Waller factors of the Ni-Ni first sub-shells have been fitted with a correlated Debye model plus a temperature independent static disorder, obtaining a Debye temperature dependence on the Al content. Even a small hydrogen content has been found to increase the static contribution to the local disorder around Ni atoms.
AB - We report extended X-ray absorption fine structure measurements in the temperature range between 20 and 300 K at the Ni K absorption edge on LaNi5 and LaNi4.5Al0.5 before and after hydrogen charging. In agreement with previous studies, an increase of the Ni-Ni distance has been found when Ni atoms are partially substituted by Al. For all the samples, the Debye-Waller factors of the Ni-Ni first sub-shells have been fitted with a correlated Debye model plus a temperature independent static disorder, obtaining a Debye temperature dependence on the Al content. Even a small hydrogen content has been found to increase the static contribution to the local disorder around Ni atoms.
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U2 - 10.1016/j.jallcom.2006.06.068
DO - 10.1016/j.jallcom.2006.06.068
M3 - Article
AN - SCOPUS:33947136810
VL - 433
SP - 33
EP - 36
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - 1-2
ER -