• Pressure-induced structural transitions in PbI2: A high-pressure Raman and optical absorption study

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      https://www.ias.ac.in/article/fulltext/pram/027/03/0449-0457

    • Keywords

       

      Lead iodide; high pressure study; Raman spectroscopy; optical absorption

    • Abstract

       

      The effect of pressure on the 2H and 4H polytype of PbI2 has been investigated by Raman and optical absorption spectroscopy, using the diamond anvil cell. The 2H-polytype undergoes pressure-induced phase transitions at 5 kbar and near 30 kbar. The 4H-polytype exhibits phase transitions near 8 kbar and above 30 kbar. The Raman modes abruptly change at these pressures. The optical absorption edge shifts red at the rate of 15±1 MeV/kbar in the 2H-PbI2 and at the rate of 7 MeV/kbar in phase II. The latter phase is most likely to possess a 3d-structure and not a layer type. The possible structures for the high pressure phases are discussed.

    • Author Affiliations

       

      A Jayaraman1 R G Maines1 T Chattopadhyay1 2

      1. AT&T Bell Laboratories, Murray Hill, New Jersey - 07974, USA
      2. Centre d’Etudes Nucleaires, DRF/SPh-MDN, Grenoble, France
    • Dates

       
  • Pramana – Journal of Physics | News

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