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A Comparison of Pressure-Induced Structural Transformations in CdSe, InP, and Si Nanocrystals

  • A. B. Herhold
  • S. H. Tolbert
  • A. A. Guzelian
  • A. P. Alivisatos
Part of the NATO ASI Series book series (ASHT, volume 12)

Abstract

Pressure-induced phase transitions in CdSe, InP and Si nanocrystals of 2 to 50 nm in diameter were studied with high pressure X-ray diffraction and optical absorption measurements. All samples were found to transform via a single nucleation event. In addition, all samples transformed at an elevated pressure with a large hysteresis compared to that of the bulk. These phenomena are explained by an overall change in shape of the crystallite after it goes through the phase transition. Evidence for this shape change is shown in the elevation of the phase transition pressure in all samples and in the high pressure shape of the Si nanocrystals. These experiments present an opportunity to investigate first order solid-solid phase transitions on a nanometer scale.

Keywords

Rock Salt Transition Path CdSe Nanocrystals Rock Salt Structure Large Hysteresis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • A. B. Herhold
    • 1
    • 2
  • S. H. Tolbert
    • 3
  • A. A. Guzelian
    • 1
    • 2
  • A. P. Alivisatos
    • 1
    • 2
  1. 1.Department of ChemistryUniversity of California at BerkeleyBerkeleyUSA
  2. 2.Materials Sciences DivisionLawrence Berkeley National LaboratoryBerkeleyUSA
  3. 3.Department of ChemistryUniversity of California at Santa BarbaraSanta BarbaraUSA

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