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

Abstract

Near the temperature of 260 K, C(60) 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 C(60) thin films on their structural behavior near this phase transition. Polycrystalline C(60) 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.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2001
Accession Number
ADP012142

Entities

People

  • Aleksandra P. Isakina
  • David Faiman
  • Eugene A. Katz
  • Konstantin A. Yagotintsev
  • Svetlana Shtutina

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Crystal Structure
  • Crystals
  • Films
  • Fullerenes
  • Glass
  • Grain Boundaries
  • Grain Size
  • Materials
  • Measurement
  • Phase Transformations
  • Polycrystals
  • Single Crystals
  • Thin Films
  • Transition Temperature
  • Transitions
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Thin Film Deposition Science.