Neutron-diffraction studies of amorphous CNx materials

Walters, J.K. and Kuhn, M. and Spaeth, C. and Fischer, Henry E. and Richter, F. and Newport, Robert J. (1997) Neutron-diffraction studies of amorphous CNx materials. Physical Review B: Condensed Matter and Materials Physics, 56 (22). pp. 14315-14321. ISSN 0163-1829. (doi: (Full text available)

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The results of neutron-diffraction experiments performed on two samples of amorphous CNx, with nitrogen concentrations of 5 and 30 at. %, prepared by a combination of filtered cathodic are and Kaufman-type ion source, are presented. Increasing the N content of the samples is seen to cause a decrease of the average bond length and the first coordination number. An increase in the average bond angle from 113 degrees to 121 degrees is also observed. The pair-distribution functions indicate that N incorporation results in some transformation of sp(3) C sites to sp(2) sites, but there is no evidence for N inducing the formation of crystalline graphitic clusters, and the overall structure remains amorphous. A direct subtraction of the two data sets emphasizes the loss of sp(3) bonds and the increasing sp(2) character of the higher-N-content sample, and shows the occurrence of a variety of bonding environments for N. More limited information on second neighbor correlations involving N is also revealed.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: J.M. Smith
Date Deposited: 29 Apr 2009 13:34 UTC
Last Modified: 27 Jun 2017 23:49 UTC
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