Study of the microdynamics of liquid lithium and lithium-hydrogen melt by inelastic neutron scattering |
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| Authors: | N M Blagoveshchenskiĭ V A Morozov A G Novikov M A Pashnev V V Savostin A L Shimkevich |
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| Institution: | (1) Leĭpunskiĭ Institute of Physics and Power Engineering, Obninsk, Kaluga oblast, 249033, Russia;(2) Russian Research Centre “Kurchatov Institute”, pl. Akademika Kurchatova 1, Moscow, 123182, Russia |
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| Abstract: | The frequency spectra of vibrations of Li atoms at temperatures of 22, 227, 397, and 557°C and the lithium-hydrogen melt (98 at % 7Li, 2 at % H) at 557°C have been obtained from the experimental neutron inelastic scattering data. On the basis of the frequency spectra, the temperature dependences of the mean-square displacement of Li atoms, the mean-square amplitudes of atomic vibrations, and the velocity autocorrelation function of atoms have been calculated. The speed of sound in liquid lithium has been estimated within the Debye model. The frequency spectra of lithium-hydrogen melt and solid lithium hydride are compared. A generalized frequency spectrum of vibrations of hydrogen atoms in lithium-hydrogen melt is obtained. |
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