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Effect of Crystalline Structure and Impurity Content of C60 Thin Films on the Order/Disorder Phase Transition

Published online by Cambridge University Press:  21 March 2011

Eugene A. Katz ,
David Faiman ,
Svetlana Shtutina ,
Aleksandra P. Isakina  and
Konstantin A. Yagotintsev
Eugene A. Katz
Affiliation:
The National Solar Energy Center, The Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boqer, 84990 Israel
David Faiman
Affiliation:
The National Solar Energy Center, The Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boqer, 84990 Israel Department of Physics, Ben-Gurion University of the Negev, Beersheba, 84105 Israel
Svetlana Shtutina
Affiliation:
Department of Physics, Ben-Gurion University of the Negev, Beersheba, 84105 Israel
Aleksandra P. Isakina
Affiliation:
Verkin Institute for Low Temperature Physics & Engineering, National Academy of Science of Ukraine, 47 Lenin Ave., Kharkov 310164, Ukraine
Konstantin A. Yagotintsev
Affiliation:
Verkin Institute for Low Temperature Physics & Engineering, National Academy of Science of Ukraine, 47 Lenin Ave., Kharkov 310164, Ukraine
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Abstract

Near the temperature of 260 K, C60 crystal is known to undergo a first order phase transition, associated with changes in molecular rotations. The present paper reports the effect of the crystalline structure and impurity content of C60 thin films on their structural behavior near this phase transition. Polycrystalline C60 films with different grain sizes and oxygen content were obtained by varying the conditions of their vacuum deposition and post-grown exposure. Temperature-resolved X-ray diffraction in the range 300 – 15 K was used to determine the lattice parameter and its changes near the phase transition temperature. Decrease in grain sizes and increase in oxygen content of the films are found to lead to a gradual reduction in the discontinuity in lattice parameter and the transition temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 675: Symposium W – Nanotubes, Fullerenes, Nanostructured and Disordered Carbon , 2001 , W7.6.1
Copyright
Copyright © Materials Research Society 2001

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References

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