Atomic structure of amorphous solids from high resolution electron microscopy - a technique for the new millenium?

Mountjoy, G. (2001) Atomic structure of amorphous solids from high resolution electron microscopy - a technique for the new millenium? Journal of Non-Crystalline Solids, 293-295 . pp. 458-463. ISSN 0022-3093. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1016/S0022-3093(01)00695-0

Abstract

A high performance electron lens can distinguish scattering from different regions of a sample, i.e., atomic density ρatm(r)=∑iδ(r−Ri), with a resolution approaching not, vert, similar1 Å – information which is not available from any other technique. Early high resolution electron microscopy (HREM) studies of amorphous solids faced scepticism due to the association of ‘amorphous' with ‘random'. This paper demonstrates two ways in which HREM gives information about atomic structure, which is not available from diffraction. Firstly, while diffraction depends on pair correlations, HREM depends on ∫ρatm(r) dz, and hence provides a probe for triplet correlations (for example). Secondly, while diffraction depends on A(k)2 (where A(k)=FT{ρatm(r)} is the scattering amplitude), HREM depends on A(k). This provides a probe for locally anisotropic medium range order (MRO), such as in the quasi-Bragg plane model for MRO in a-SiO2 by Gaskell et al. These relationships are demonstrated using computer simulations on models of ta-C.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: Gavin Mountjoy
Date Deposited: 29 Oct 2008 18:09
Last Modified: 14 Jan 2010 14:38
Resource URI: http://kar.kent.ac.uk/id/eprint/9908 (The current URI for this page, for reference purposes)
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