Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-05T10:25:09.530Z Has data issue: false hasContentIssue false

Experimental and Theoretical Characterisation of Structure in Thin Disordered Films

Published online by Cambridge University Press:  02 July 2020

D.G. McCulloch
Affiliation:
Key Centre for Microscopy and Microanalysis, University of Sydney, NSW, 2006, Australia.
D.R. McKenzie
Affiliation:
Key Centre for Microscopy and Microanalysis, University of Sydney, NSW, 2006, Australia. School of Physics, University of Sydney, NSW, 2006, Australia.
D.J.H. Cockayne
Affiliation:
Key Centre for Microscopy and Microanalysis, University of Sydney, NSW, 2006, Australia.
C.M. Goringe
Affiliation:
Key Centre for Microscopy and Microanalysis, University of Sydney, NSW, 2006, Australia.
Get access

Extract

The electron microscope provides an ideal environment for the structural analysis of small volumes of amorphous and polycrystalline materials by collecting scattering information as a function of energy loss and momentum transfer. The scattering intensity at zero energy loss can be readily processed to a reduced density function G(r), providing information on nearest neighbour distances and bond angles[l]. Figure 1(a) shows the G(r) for glassy carbon, a turbostratic form of graphite. The three nearest neighbours in glassy carbon (labelled 1-3 in figure 1) are at 1.42 Å, 2.44 Å and 3.75 Å respectively. These distances correspond to the first three nearest neighbours in a graphite sheet and are expected in glassy carbon which is know to have good in-plane graphitic order. In figure 1(b) the G(r) of cathodic arc deposited tetrahedral amorphous carbon is shown. This material contains a high fraction of diamond-like bonding[2] and has a 1st nearest neighbour peak at 1.52 Å.

Type
Nanophase and Amorphous Materials
Copyright
Copyright © Microscopy Society of America

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

[1] Cockayne, D.J.H., McKenzie, D.R. and Muller, D.A., Microsc. Microanal. Microstruct., 2, 359 (1991).CrossRefGoogle Scholar

[2] Berger, S.D., McKenzie, D.R. and Martin, P.J., Philos. Mag. Lett, 57, 285 (1988).CrossRefGoogle Scholar

[3] Car, R. and Parrinello, M., Phys. Rev. Lett., 55, 2471 (1985).CrossRefGoogle Scholar

[4] Marks, N.A., McKenzie, D.R., Pailthorpe, B.A., Bernasconi, M., and Parrinello, M., Phys. Rev. Lett, 76 768 (1996).CrossRefGoogle Scholar