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Investigation of the Surface Stress in SiC Nanocrystals by In-situ High Pressure Powder Diffraction Technique

Published online by Cambridge University Press:  10 February 2011

B. Palosz ,
S. Stel'makh ,
E. Grzanka ,
S. Gierlotka ,
Y. Zhao  and
W. Palosz
B. Palosz
Affiliation:
High Pressure Research Center UNIPRESS, ul. Sokolowska 29/37, 01-142 Warsaw, Poland
S. Stel'makh
Affiliation:
High Pressure Research Center UNIPRESS, ul. Sokolowska 29/37, 01-142 Warsaw, Poland
E. Grzanka
Affiliation:
High Pressure Research Center UNIPRESS, ul. Sokolowska 29/37, 01-142 Warsaw, Poland Institute of Experimental Physics, Warsaw University, ul. Hoza 69, 00-681 Warsaw, Poland
S. Gierlotka
Affiliation:
High Pressure Research Center UNIPRESS, ul. Sokolowska 29/37, 01-142 Warsaw, Poland
Y. Zhao
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
W. Palosz
Affiliation:
USRA/NASA-Marshall Space Flight Center, Huntsville, Alabama 35812, USA
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Abstract

The properties of nanocrystals were studied by in-situ high-pressure powder diffraction technique using our methodology of the structural analysis, the “apparent lattice parameter” (alp) concept. The experiments were performed for nanocrystalline SiC and diamond powders using synchrotron and neutron sources and hydrostatic or isostatic pressure. Elastic properties of the samples were examined based on the measurements of the lattice parameters and of the reflection width, as well as of interatomic distances. The results show a dual nature of the properties (compressibilities) of the powders indicating a complex, core-shell structure of the grains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 778: Symposium U – Mechanical Properties Derived from Nanostructuring Materials , 2003 , U1.11
Copyright
Copyright © Materials Research Society 2002

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References

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