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Title: Origin of Macrostrains and Microstrains in Daimond-SiC Nanocomposites Based on the Core-shell Model

Abstract

SiC-diamond nanocomposites were synthesized from nanodiamond and nanosilicon powders. A core-shell model of the composite nanocrystals was examined assuming that interatomic distances in the grain interior, the core, and at the surface shell (grain boundaries in nanocrystalline solids) are different. The samples were investigated by x-ray diffraction using synchrotron source. The powder diffractograms were elaborated based on the apparent lattice parameter methodology. The structure of the composites and its dependence on the sintering conditions is discussed. It is shown that as the sintering temperature increases the interatomic distances in the grain cores decrease, while the opposite occurs in the grain shells (forming the grain boundaries). Under some sintering temperature the interatomic distances in the core and in the shell get equal. However, for diamond this happens under different temperature than for SiC, thus internal strains in the composites are unavoidable.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
959690
Report Number(s):
BNL-82676-2009-JA
Journal ID: ISSN 0021-8979; JAPIAU; TRN: US1005782
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 102
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE; DIAMONDS; INTERATOMIC DISTANCES; LATTICE PARAMETERS; ORIGIN; SINTERING; STRAINS; SYNCHROTRONS; X-RAY DIFFRACTION; SILICON CARBIDES; national synchrotron light source

Citation Formats

Palosz,B., Stelmakh, S., Grzanka, E., Gierlotka, S., Nauyoks, S., Zerda, T., and Palosz, W. Origin of Macrostrains and Microstrains in Daimond-SiC Nanocomposites Based on the Core-shell Model. United States: N. p., 2007. Web. doi:10.1063/1.2785025.
Palosz,B., Stelmakh, S., Grzanka, E., Gierlotka, S., Nauyoks, S., Zerda, T., & Palosz, W. Origin of Macrostrains and Microstrains in Daimond-SiC Nanocomposites Based on the Core-shell Model. United States. doi:10.1063/1.2785025.
Palosz,B., Stelmakh, S., Grzanka, E., Gierlotka, S., Nauyoks, S., Zerda, T., and Palosz, W. Mon . "Origin of Macrostrains and Microstrains in Daimond-SiC Nanocomposites Based on the Core-shell Model". United States. doi:10.1063/1.2785025.
@article{osti_959690,
title = {Origin of Macrostrains and Microstrains in Daimond-SiC Nanocomposites Based on the Core-shell Model},
author = {Palosz,B. and Stelmakh, S. and Grzanka, E. and Gierlotka, S. and Nauyoks, S. and Zerda, T. and Palosz, W.},
abstractNote = {SiC-diamond nanocomposites were synthesized from nanodiamond and nanosilicon powders. A core-shell model of the composite nanocrystals was examined assuming that interatomic distances in the grain interior, the core, and at the surface shell (grain boundaries in nanocrystalline solids) are different. The samples were investigated by x-ray diffraction using synchrotron source. The powder diffractograms were elaborated based on the apparent lattice parameter methodology. The structure of the composites and its dependence on the sintering conditions is discussed. It is shown that as the sintering temperature increases the interatomic distances in the grain cores decrease, while the opposite occurs in the grain shells (forming the grain boundaries). Under some sintering temperature the interatomic distances in the core and in the shell get equal. However, for diamond this happens under different temperature than for SiC, thus internal strains in the composites are unavoidable.},
doi = {10.1063/1.2785025},
journal = {Journal of Applied Physics},
number = ,
volume = 102,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}