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RDF Analysis of Ion-Amorphized SiO2 and SiC from Electron Diffraction using Post-Specimen Scanning in the Field-Emission Scanning Transmission Electron Microscope

Published online by Cambridge University Press:  10 February 2011

David C. Bell ,
Anthony J. Garratt-Reed  and
Linn W. Hobbst
David C. Bell
Affiliation:
Center for Materials Science and Engineering
Anthony J. Garratt-Reed
Affiliation:
Center for Materials Science and Engineering
Linn W. Hobbst
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology Cambridge, MA, 02139
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Abstract

Radial density functions (RDFs) provide important information about short- and ntermediaterange structure of topologically-disordered materials such as glasses and irradiation-amorphized materials. We have determined RDFs for irradiation-amorphized SiO2, AIPO4 and SiC by energy-filtered electron diffraction methods in a field-emission scanning transmission electron microscope (FEG-STEM) equipped with a digital parallel-detection electron energy-loss spectrometer. Post-specimen rocking was used to minimize the effects of spherical aberration in the objective lens, which interfere with the acquisition of data collected by pre-specimen rocking. Useful energy-filtered data has been collected beyond an angular range defined by q = 2 sin(Θ/2)/λ = 25 nm−1

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 504: Symposium KK – Atomistic Mechanisms in Beam Synthesis & Irradiation… , 1997 , 147
Copyright
Copyright © Materials Research Society 1998

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References

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