Picosecond Electronic Spectroscopy to Determine the Transformation Mechanism for the Pressure-Induced Phase Transition in Shocked CdS Metadata

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Title

  • Main Title Picosecond Electronic Spectroscopy to Determine the Transformation Mechanism for the Pressure-Induced Phase Transition in Shocked CdS

Creator

  • Author: Knudson, M.D.
    Creator Type: Personal
  • Author: Gupta, Y.M.
    Creator Type: Personal
  • Author: Kunz, A.B.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: US Department of Energy (United States)

Publisher

  • Name: Sandia National Laboratories
    Place of Publication: Albuquerque, New Mexico
    Additional Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)

Date

  • Creation: 1999-07-21

Language

  • English

Description

  • Content Description: Plate impact, shock wave experiments provide a unique method to investigate the time-dependent mechanisms and the kinetics associated with pressure-induced phenomena, such as chemical reactions and phase transformations. The very rapid and well defined loading conditions associated with plate-impact experiments permit real-time examination of the shock-induced changes. Further, the ability to propagate the shock wave along various crystallographic directions provides the means to perform careful analysis of the stress and orientational dependence. Recently, an experimental method has been developed to observe real-time changes in the absorption transmission of materials, with 100 or 200 ps resolution, in single-event, plate impact shock experiments [1-4]. These data can provide useful information regarding the material under investigation. In particular, the dependence of the absorption edge on photon energy can distinguish between direct and indirect electronic transitions, and can provide an estimate of the band-gap energy of the material [5]. Along with ab-initio techniques to calculate the electronic structure of a crystalline system, this electronic information can be used to gain insight regarding the crystal structure. As described in Ref. [1,2,4] the wurtzite-to-rocksalt phase transition in cadmium sulfide (CdS) is well suited to investigation through the use of fast electronic spectroscopy; the wurtzite and rocksalt phases exhibit a direct and indirect band gap with band gap energies of 2.5 and 1.5-1.7 eV, respectively [6-8]. The intent of this work was to use picosecond electronic spectroscopy and ab-initio methods to examine the real-time structural changes that occur in the initial stages of the shock-induced wurtzite-to-rocksalt phase transition in single crystal CdS.
  • Physical Description: 4 p.

Subject

  • Keyword: Electronic Structure
  • Keyword: Impact Shock
  • Keyword: Chemical Reactions
  • Keyword: Crystal Structure
  • STI Subject Categories: 36 Materials Science
  • Keyword: Shock Waves
  • Keyword: Phase Transformations
  • Keyword: Spectroscopy
  • Keyword: Cadmium Sulfides
  • Keyword: Transformations
  • Keyword: Monocrystals

Source

  • Conference: AIRAPT-17 International Conference on High Pressure Science and Technology, Honolulu, HI (US), 07/25/1999--07/30/1999

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: SAND99-1848C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 9590
  • Archival Resource Key: ark:/67531/metadc792797

Note

  • Display Note: OSTI as DE00009590
  • Display Note: Medium: P; Size: 4 pages