Accession Number:

ADP012166

Title:

Medium-Range Order Structures of Amporphous Diamond-Like Carbon Films

Descriptive Note:

Proceedings

Corporate Author:

ARGONNE NATIONAL LAB IL

Report Date:

2001-04-01

Pagination or Media Count:

6.0

Abstract:

In this paper, we have studied medium-range order structures in amorphous diamond-like carbon films with fluctuation microscopy. Medium-range order structures are quantified by a specific form of a general four-body correlation. We name this function as a pair-pair alignment correlation function. By analyzing speckle dark-field images taken over different areas as a function of momentum transfer in reciprocal space, we measured the pair-pair alignment correlation function for both thermally annealed samples and unannealed samples. We have found that thermal annealing introduces medium-range order in amorphous diamond-like carbon films, causing more pairs of atoms to be aligned. These results agree with density-functional simulations. Larger-scale simulations will be needed to filly understand our experimental results.

Subject Categories:

  • Physical Chemistry
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE