IEC 50 |
| Bogdan Palosz1, Ewa Grzanka1, Svetlana Stelmakh1, Stanislaw Gierlotka1, H.P. Weber2, Thomas Proffen3, and Witold Palosz4. (1) High Pressure Research Center UNIPRESS, Sokolowska 29/37, Warsaw, 01-142, Poland, (2) SNBL at ESRF, Grenoble, France, (3) Los Alamos National Laboratory, Los Alamos, NM, (4) SD46, USRA/NASA-Marshall Space Flight Center, Huntsville, AL 35812 |
| The real atomic structure of nanocrystals determines unique, key properties of the materials. Determination of the structure presents a challenge due to inherent limitations of standard powder diffraction techniques when applied to nanocrystals. Alternate methodology of the structural analysis of nanocrystals (several nanometers in size) based on Bragg-like scattering and called the "apparent lattice parameter" (alp) is proposed. Application of the alp methodology to examination of the core-shell model of nanocrystals will be presented. The results of application of the alp method to structural analysis of several nanopowders were complemented by those obtained by determination of the Atomic Pair Distribution Function, PDF. Based on synchrotron and neutron diffraction data measured in a large diffraction vector of up to Q=25 Å-1, the surface stresses in nanocrystalline diamond and SiC were evaluated. |
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Industrial Crystallization (sponsored by Separation Science & Technology Subdivision)
8:30 AM-12:10 PM, Monday, March 24, 2003 Convention Center -- Room 393, Oral
Division of Industrial and Engineering Chemistry |