Abstract
Ball milled magnesium hydride with an average size of about 40 nm and bulk magnesium hydride have been studied with vibrational spectroscopy together with density functional computer calculations. Using this combination of techniques structural information can now be obtained on a nanometer scale, which is especially important for nanosized samples. Such samples exhibit very broad diffraction lines, from which limited information about the structure can be extracted. It was found that ball milling distorts the vibrational spectra due to distribution in stresses over the sample. Cycling of the hydrogen content of ball milled samples results in the spectrum of unmilled samples, while the particle size remains small and hydrogen storage characteristics continue to be better for ball milled samples. We conclude that improved performance for hydrogen storage applications of ball milled magnesium hydride has to be attributed to the reduction of the particle size, while defect densities inside the particles play less of a role.
Original language | English |
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Pages (from-to) | 1-4 |
Number of pages | 4 |
Journal | Journal of Alloys and Compounds |
Volume | 393 |
Issue number | 1-2 |
DOIs | |
State | Published - May 3 2005 |
Externally published | Yes |
Funding
This work is a contribution from the Delft Institute of Sustainable Energy (DISE). Financial support was received from the Dutch Science Foundation (NWO) for experiments at ISIS.
Funders | Funder number |
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Nederlandse Organisatie voor Wetenschappelijk Onderzoek | |
ISIS | |
Nederlandse Organisatie voor Wetenschappelijk Onderzoek |
Keywords
- Density functional calculations
- Hydrogen storage materials
- Magnesium hydride
- Neutron scattering