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RESEARCH PRODUCT
Large atomic disorder in nanostructured LaNi5 alloys: A la L3-edge extended X-ray absorption fine structure study
Benedetto SchiavoA. CognigniBoby JosephLuca OliviNaurang L. SainiAntonella Iadecolasubject
Mean squareMaterials scienceAtomic orderAnnealing (metallurgy)Analytical chemistry02 engineering and technology01 natural sciencesLocal structureRandom order0103 physical sciencesGeneral Materials ScienceNanostructuringSpectroscopy010302 applied physicsExtended X-ray absorption fine structured. crystal structureCrystal structurec. exafsGeneral Chemistry021001 nanoscience & nanotechnologyCondensed Matter Physicsd. crystal structure; a. nanostructuring; c. exafs; a. lani5 alloysEXAFSLaNi5 alloya. lani5 alloys0210 nano-technologya. nanostructuringdescription
Abstract Local structure of the nanostructured LaNi 5 alloys, prepared by ball-milling, has been studied using La L 3 -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 LaNi 5 powders.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-08-01 |