Browsing by Author "Vinnikov, NA"

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    Thermal expansion of solutions of deuteromethane in fullerite C60 at low temperatures. Isotopic effect
    (American Institute of Physics, 2009-03) Dolbin, AV; Vinnikov, NA; Gavrilko, VG; Esel'son, VB; Manzheliĭ, VG; Gadd, GE; Moricca, SA; Cassidy, DJ; Sundqvist, B
    The thermal expansion of CD4 solutions in the orientational glass C60 with molar concentration of deuteromethane 20 and 50% has been investigated in the temperature range 2.5–23 K. The orientational glass CD4–C60 undergoes a first-order phase transition in the temperature interval 4.5–55 K. This transition is manifested as hysteresis of the linear thermal expansion coefficient α as well as maxima in the temperature dependences α(T) and τ1(T), where τ1 is the characteristic thermalization time of the experimental samples. The characteristic re-orientation times of the C60 molecules and the characteristic phase transformations occurring in the experimental solutions are determined. The results of the present study are compared with the results of a similar study of the solution CH4–C60. It is concluded that tunneling rotation of the CH4 and CD4 molecules occupying interstitial positions in the fullerite C60 lattice occurs. © 2009, American Institute of Physics