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A Model of Strain Distribution in Nanocrystalline SiC and Diamond at Very High Pressures; In-Situ X-RAY Diffraction Study and Computer Modelling

Published online by Cambridge University Press:  10 February 2011

R. Pielaszek ,
B. Palosz ,
S. Gierlotka ,
S. Stel'Makh  and
U. Bismayer
R. Pielaszek
Affiliation:
High Pressure Research Center UNIPRESS, ul.Sokolowska 29, PO Box 65, 01 142 Warsaw, Poland
B. Palosz
Affiliation:
High Pressure Research Center UNIPRESS, ul.Sokolowska 29, PO Box 65, 01 142 Warsaw, Poland
S. Gierlotka
Affiliation:
High Pressure Research Center UNIPRESS, ul.Sokolowska 29, PO Box 65, 01 142 Warsaw, Poland
S. Stel'Makh
Affiliation:
High Pressure Research Center UNIPRESS, ul.Sokolowska 29, PO Box 65, 01 142 Warsaw, Poland
U. Bismayer
Affiliation:
Mineralogisch-Petrografisches Institut, Uni Hamburg, Grindelallee 48, 20146 Hamburg, Germany
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Abstract

A modeling of nanoparticles and ab initio simulation of the scattered intensity from the Debye functions is used as a tool for an examination of the strain induced under high pressure in nanocrystalline silicon carbide and diamond. The analysis of the experimental intensity profiles includes a determination of the atomic structure and microstructure of the materials. The advantages of modeling over conventional methods of the analysis of powder diffraction data are discussed. Examples of using the modeling for determination of the shape and size and of one dimensional disordering in very small particles (2-4 nm), and development of internal strains in 10 nm SiC nanocrystals subjected to high pressures are given.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 538: Symposium J – Multiscale Modelling of Materials , 1998 , 561
Copyright
Copyright © Materials Research Society 1999

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References

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