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Neutron-diffraction studies of amorphous CNx materials

Walters, J.K., Kuhn, M., Spaeth, C., Fischer, Henry E., Richter, F., 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:10.1103/PhysRevB.56.14315)


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
DOI/Identification number: 10.1103/PhysRevB.56.14315
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: 28 May 2019 13:53 UTC
Resource URI: (The current URI for this page, for reference purposes)
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