, Volume 27, Issue 3, pp 449–457 | Cite as

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

  • A Jayaraman
  • R G Maines
  • T Chattopadhyay
Solid State Physics


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.


Lead iodide high pressure study Raman spectroscopy optical absorption 


62.50 64.70 78.30 


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Copyright information

© Indian Academy of Sciences 1986

Authors and Affiliations

  • A Jayaraman
    • 1
  • R G Maines
    • 1
  • T Chattopadhyay
    • 1
    • 2
  1. 1.AT&T Bell LaboratoriesMurray HillUSA
  2. 2.Centre d’Etudes Nucleaires, DRF/SPh-MDNGrenobleFrance

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