Local structure of the nanostructured LaNi5 alloys, prepared by ball-milling, has been studied using La L3-edge extended X-ray absorption fine structure spectroscopy. The near-neighbor distances tend to decrease with the ball-milling, and the mean square relative displacements (MSRD) show substantial increase suggesting an increased atomic disorder. High temperature annealing helps in partial recovery of atomic order in the ball-milled samples for milling times upto 20 h, however, the long-time ball-milled samples seems to gain only a local random order. The results suggest that reduced unit-cell volume together with large atomic-disorder might be causing a higher energy-barrier for the hydride-phase formation in the long time ball-milled LaNi5 powders.

Joseph, B., Iadecola, A., Schiavo, B., Cognini, A., Olivi, L., Saini, N.L. (2010). Large atomic disorder in nanostructured LaNi5 alloys: A La L3-edge extended X-ray absorption fine structure study. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2010 [doi:10.1016/j.jpcs.2010.03.008].

Large atomic disorder in nanostructured LaNi5 alloys: A La L3-edge extended X-ray absorption fine structure study

SCHIAVO, Benedetto;
2010-01-01

Abstract

Local structure of the nanostructured LaNi5 alloys, prepared by ball-milling, has been studied using La L3-edge extended X-ray absorption fine structure spectroscopy. The near-neighbor distances tend to decrease with the ball-milling, and the mean square relative displacements (MSRD) show substantial increase suggesting an increased atomic disorder. High temperature annealing helps in partial recovery of atomic order in the ball-milled samples for milling times upto 20 h, however, the long-time ball-milled samples seems to gain only a local random order. The results suggest that reduced unit-cell volume together with large atomic-disorder might be causing a higher energy-barrier for the hydride-phase formation in the long time ball-milled LaNi5 powders.
2010
Joseph, B., Iadecola, A., Schiavo, B., Cognini, A., Olivi, L., Saini, N.L. (2010). Large atomic disorder in nanostructured LaNi5 alloys: A La L3-edge extended X-ray absorption fine structure study. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2010 [doi:10.1016/j.jpcs.2010.03.008].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/50145
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