6533b7d1fe1ef96bd125bac5
RESEARCH PRODUCT
Local structure of ball-milled LaNi5 hydrogen storage material by Ni K-edge EXAFS
Boby JosephNaurang L. SainiA. CognigniG. D'alí StaitiBenedetto SchiavoAntonella IadecolaLuca Olivisubject
Materials scienceAbsorption spectroscopyExtended X-ray absorption fine structureAnnealing (metallurgy)Analytical chemistryIntermetallicHydrogen storage materials Nanostructuring Local structure Atomic disorderCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsInorganic ChemistryHydrogen storageCrystallographyX-ray crystallographyMaterials ChemistryCeramics and CompositesPhysical and Theoretical ChemistrySpectroscopyBall milldescription
Abstract Local structure of the nanostructured LaNi5 hydrogen storage alloys, prepared by ball-milling, has been studied using Ni K-edge extended X-ray absorption fine structure spectroscopy. Results indicate that the ball-milling up to 100 h results in the production of nanoparticles characterized by large atomic disorder and slightly reduced unit-cell volume, compared to the bulk LaNi5. High temperature annealing appears to help in partial recovery of atomic order in the ball-milled samples; however, long-time ball-milled samples retain large disorder even after the high temperature annealing. The results suggest that the large disorder and the reduced unit-cell volume might be causing a higher energy-barrier for the hydride-phase formation in the long time ball-milled LaNi5 powders.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-07-01 |