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Zeppenfeld , P.; Bienfait , M.; Feng Chuan Liu ,; Vilches , O.E.; Coddens , G. (1990)
Publisher: HAL CCSD
Languages: English
Types: Article
Subjects: neutron diffraction examination of materials, deuterium, surface diffusion, [ PHYS.HIST ] Physics [physics]/Physics archives, melting, hydrogen, surface phase transformations, thin films
Quasi-elastic neutron scattering has been used to measure, below the bulk melting temperature, the thickness and the diffusion coefficient of the mobile surface layer of 8 and 10 layer thick films of deuterium hydride (HD) condensed on MgO(100). The measurements show that the close-packed surface of solid HD surface melts gradually, with the thickness of the melted layer increasing from 0.5 to 6 molecular layers as the temperature rises from 4 K to 0.05 K below the bulk melting temperature. The diffusion coefficients are in the 10-5 cm2 s-1 range indicating that the surface disordered film is liquid-like.
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