Neutron spectroscopy of magnesium dihydride

► α-MgH 2 is studied by inelastic neutron scattering (INS) with a good accuracy. ► Density g( E) of phonon states in α-MgH 2 is constructed based on the INS results. ► Heat capacity of α-MgH 2 at temperatures up to 2000 K is calculated from the g( E). ► The calculated heat capacity agrees within 2.5...

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Bibliographic Details
Published in:Journal of alloys and compounds 2011-09, Vol.509, p.S599-S603
Main Authors: Kolesnikov, A.I., Antonov, V.E., Efimchenko, V.S., Granroth, G., Klyamkin, S.N., Levchenko, A.V., Sakharov, M.K., Ren, Y.
Format: Article
Language:English
Subjects:
Alloys
Density
Dihydrides
Heat capacity
Inelastic neutron scattering
Magnesium
Mathematical analysis
Metal hydrides
Neutron scattering
Spectra
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Summary:► α-MgH 2 is studied by inelastic neutron scattering (INS) with a good accuracy. ► Density g( E) of phonon states in α-MgH 2 is constructed based on the INS results. ► Heat capacity of α-MgH 2 at temperatures up to 2000 K is calculated from the g( E). ► The calculated heat capacity agrees within 2.5% with the precise literature data. INS is therefore able to give heat capacity of hydrides with a calorimetric precision. Inelastic neutron scattering spectra of α-MgH 2 powder have been measured at T = 7 K with an energy resolution better than 1.5% using the time-of-flight direct geometry spectrometer SEQUOIA. Based on these spectra, the density g( E) of phonon states in α-MgH 2 has been experimentally constructed for the first time. Comparing the available experimental data on the heat capacity of α-MgH 2 with those calculated using the obtained g( E) confirmed the good accuracy of its determination.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2010.10.156