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High Pressure X-Ray Diffraction Studies on Nanocrystalline MaterialsApplication of in situ high pressure powder diffraction technique for examination of specific structural properties of nanocrystals based on the experimental data of SiC nanocrystalline powders of 2 to 30 nrn diameter in diameter is presented. Limitations and capabilities of the experimental techniques themselves and methods of diffraction data elaboration applied to nanocrystals with very small dimensions (< 30 nm) are discussed. It is shown that due to the complex structure, constituting a two-phase, core/surface shell system, no unique lattice parameter value and, consequently, no unique compressibility coefficient can satisfactorily describe the behavior of nanocrystalline powders under pressure. We offer a tentative interpretation of the distribution of macro- and micro-strains in nanoparticles of different grain size.
Document ID
20030061101
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Palosz, B.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Stelmakh, S.
(Polish Academy of Sciences Warsaw, Poland)
Grzanka, E.
(Polish Academy of Sciences Warsaw, Poland)
Gierlotka, S.
(Polish Academy of Sciences Warsaw, Poland)
Pielaszek, R.
(Polish Academy of Sciences Warsaw, Poland)
Bismayer, U.
(Hamburg Univ. Germany)
Werner, S.
(Technische Univ. Munich, Germany)
Palosz, W.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Solid-State Physics
Distribution Limits
Public
Copyright
Other

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