High pressure studies on nanometer sized clusters: Structural, optical, and cooperative properties

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High-pressure Se EXAFS is used to study pressure-induced structural transformations in CdSe nanocrystals. The transformation is wurtzite to rock salt, at a pressure much higher than in bulk. High-pressure XRD is used to confirm the EXAFS results. Diffraction peak widths indicate that nanocrystals do not fragment upon transformation. Optical absorption correlates with structural transformations and is used to measure transition pressures; transformation pressure increases smoothly as nanocrystal size decreases. Thermodynamics of transformation is modeled using an elevated surface energy in the high-pressure phase. High-pressure study of Si nanocrystals show large increases in transformation pressure in crystallites to 500{angstrom} diameter, and ... continued below

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131 p.

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Tolbert, S.H. May 1, 1995.

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This thesis or dissertation is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 13 times . More information about this document can be viewed below.

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Description

High-pressure Se EXAFS is used to study pressure-induced structural transformations in CdSe nanocrystals. The transformation is wurtzite to rock salt, at a pressure much higher than in bulk. High-pressure XRD is used to confirm the EXAFS results. Diffraction peak widths indicate that nanocrystals do not fragment upon transformation. Optical absorption correlates with structural transformations and is used to measure transition pressures; transformation pressure increases smoothly as nanocrystal size decreases. Thermodynamics of transformation is modeled using an elevated surface energy in the high-pressure phase. High-pressure study of Si nanocrystals show large increases in transformation pressure in crystallites to 500{angstrom} diameter, and an overall change in crystallite shape upon transformation is seen from XRD line widths. C{sub 60} single crystals were studied using Raman scattering; results provide information about the clusters` rotational state. Optical properties of high-pressure phase CdSe clusters were studied.

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131 p.

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OSTI as DE96001075

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  • Other Information: TH: Thesis (Ph.D.)

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  • Other: DE96001075
  • Report No.: LBL--37591
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 110667
  • Archival Resource Key: ark:/67531/metadc626325

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  • May 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • April 5, 2016, 10:05 a.m.

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Tolbert, S.H. High pressure studies on nanometer sized clusters: Structural, optical, and cooperative properties, thesis or dissertation, May 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc626325/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.