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2002 | 102 | 2 | 167-174
Article title

Generation and Relaxation of Microstrains in GaN Nanocrystals under Extreme Pressures

Content
Title variants
Languages of publication
EN
Abstracts
EN
Nanocrystalline powders of GaN with grain sizes ranging from 2 to 30 nm were examined under high external pressures by in situ diffraction techniques in a diamond anvil cell at DESY (HASYLAB, Station F3). The experiments on densification of pure powders under high pressure were performed without a pressure medium. The mechanism of generation and relaxation of internal strains and their distribution in nanoparticles was deduced from the Bragg reflections recorded in situ under high pressures at room temperature. The microstrain was calculated from the full-width at half-maximum (FWHM) values of the Bragg lines. It was found that microstrains in GaN crystallites are generated and subsequently relaxed by two mechanisms: generation of stacking faults and change of the size and shape of the grains occurring under external stress.
Keywords
EN
Publisher

Year
Volume
102
Issue
2
Pages
167-174
Physical description
Dates
published
2002-08
received
2001-09-23
Contributors
author
  • High Pressure Research Center UNIPRESS, Sokołowska 29/37, 01-142 Warsaw, Poland
  • Institute of Experimental Physics, Warsaw University, Warsaw, Poland
author
  • High Pressure Research Center UNIPRESS, Sokołowska 29/37, 01-142 Warsaw, Poland
author
  • High Pressure Research Center UNIPRESS, Sokołowska 29/37, 01-142 Warsaw, Poland
author
  • High Pressure Research Center UNIPRESS, Sokołowska 29/37, 01-142 Warsaw, Poland
  • Institute of Experimental Physics, Warsaw University, Warsaw, Poland
author
  • Mineral-Petrographisches Institut, University of Hamburg, Hamburg, Germany
author
  • University of Mining and Metallurgy, Cracow, Poland
author
  • Department of Chemistry, Duke University, Durham, USA
author
  • USRA/NASA-Marshall Space Flight Center, Huntsville, Alabama, USA
author
  • Mineralogisch-Petrologisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn, Bonn, Germany
References
  • 1. J.F. Janik, J.R. Wells, Chem. Mater., 8, 2708, 1996
  • 2. B. Bondars, S. Gierlotka, B. Palosz, S. Smekhnov, Mater. Sci. Forum, 166-169, 737, 1993
  • 3. B. Palosz, S. Gierlotka, E. Grzanka, K. Akimow, R. Pielaszek, P. Biczyk, A. Grzegorczyk, S. Stel'makh, U. Bismayer, J.F. Janik, Mater. Sci. Forum, 378-381, 735, 2001
  • 4. E. Grzanka, B. Palosz, S. Gierlotka, R. Pielaszek, K. Akimow, U. Bismayer, J.F. Janik, Annual Report Hasylab 2000, p. 481
  • 5. E. Grzanka, B. Palosz, S. Gierlotka, R. Pielaszek, K. Akimow, U. Bismayer, J.F. Janik, Annual Report Hasylab 2000, p. 483
  • 6. R. Pielaszek, S. Gierlotka, S. Stel'makh, E. Grzanka, B. Palosz, Defect and Diffusion Forum, 208-209, 189, 2002
  • 7. J-W. Hwang, J.P. Campbell, J. Kozubowski, S.A. Hanson, J.E. Evans, W.L. Gladfelter, Chem. Mater., 7, 517, 1995
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv102n202kz
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