Transformation Mechanism and Kinetics for the Pressure-Induced Phase Transition in Shocked CdS

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The pressure-induced phase transition in CdS was investigated using picosecond time-resolved electronic spectroscopy in plate impact shock wave experiments. Real-time changes in the electronic spectra were observed, with 100 ps time resolution, in single crystals of CdS shocked along the c and a axes to peak stresses between 35 and 90 kbar (above the phase transition stress of approximately 30 kbar measured in continuum studies). When shocked to stresses above approximately 50 kbar along the crystal c axis and 60 to 70 kbar along the crystal a axis, the crystals undergo a very rapid change in electronic structure, indicating that ... continued below

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6 p.

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Gupta, Y.M.; Knudson, M.D. & Kunz, A.B. June 24, 1999.

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

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Description

The pressure-induced phase transition in CdS was investigated using picosecond time-resolved electronic spectroscopy in plate impact shock wave experiments. Real-time changes in the electronic spectra were observed, with 100 ps time resolution, in single crystals of CdS shocked along the c and a axes to peak stresses between 35 and 90 kbar (above the phase transition stress of approximately 30 kbar measured in continuum studies). When shocked to stresses above approximately 50 kbar along the crystal c axis and 60 to 70 kbar along the crystal a axis, the crystals undergo a very rapid change in electronic structure, indicating that significant structural changes occur within the first 100 ps. These results, along with previous ns continuum measurements, make a strong case for a metastable state during the phase transition in shocked CdS. Ab-initio periodic Hartree-Fock calculations (with DFT correlation corrections) were employed to examine the compression of CdS and to determine a possible lattice structure for the proposed metastable structure. These results, along with details of the transformation kinetics and orientational dependence, will be discussed. Work supported by ONR.

Physical Description

6 p.

Notes

OSTI as DE00008464

Medium: P; Size: 6 pages

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  • Shock Compression of Condensed Matter (SHOCK99), Snowbird, UT (US), 06/27/1999--07/02/1999

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  • Report No.: SAND99-1584C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 8464
  • Archival Resource Key: ark:/67531/metadc782313

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  • June 24, 1999

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • April 11, 2017, 1:26 p.m.

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Gupta, Y.M.; Knudson, M.D. & Kunz, A.B. Transformation Mechanism and Kinetics for the Pressure-Induced Phase Transition in Shocked CdS, article, June 24, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc782313/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.