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EFFECTS OF ANNEALING AND Ar INTERCALATION ON GLASS TRANSITION IN C60 FILMS

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Author Info

  • JIAN WU

    (National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P. R. China)

  • MIN GU

    ()
    (National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P. R. China)

  • LILI ZHANG

    (National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P. R. China)

  • YAO YU

    (National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P. R. China)

  • XIN CHEN

    (National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P. R. China)

  • TONG B. TANG

    (Department of Physics, Hong Kong Baptist University, Kowloon, Hong Kong SAR, P. R. China)

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    Abstract

    C60 films were fabricated by vacuum sublimation and studied with dielectric spectroscopy regarding glass transition. With annealing, the dielectric loss peaks decreased in height, and the apparent activation energy deduced from their frequency dependence dropped in magnitude. The peaks, broad and asymmetrical, were fitted with Ngai's correlated-states model. The calculated value of the correlation constant β increased after annealing, which may be explained by the reduction in extrinsic dipole density. Some annealed films were further charged with Ar under high pressure, and found to have suppressed transition temperature and activation energy, attributable to the negative pressure effect of intercalation. Freshly charged films exhibited a feature near 137 K in their impedance spectra, probably due to domains of exceptionally high Ar concentration.

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    Bibliographic Info

    Article provided by World Scientific Publishing Co. Pte. Ltd. in its journal Surface Review and Letters.

    Volume (Year): 14 (2007)
    Issue (Month): 04 ()
    Pages: 601-606

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    Handle: RePEc:wsi:srlxxx:v:14:y:2007:i:04:p:601-606

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    Related research

    Keywords: C60 film; glass transition; annealing; Ar intercalation;

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    Cited by:
    1. Vives, Xavier, 2011. "Endogenous public information and welfare," IESE Research Papers D/925, IESE Business School.

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