Accession Number:

ADP012142

Title:

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

Descriptive Note:

Proceedings

Corporate Author:

BEN-GURION UNIV OF THE NEGEV SEDE BOQER(ISRAEL) JACOB BLAUSTEIN INST FOR DESERT RESEARCH

Report Date:

2001-04-01

Pagination or Media Count:

6.0

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.

Subject Categories:

  • Crystallography
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE