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

Jayaraman, A. ; Maines, R. G. ; Chattopadhyay, T. (1986) Pressure-induced structural transitions in PbI2: a high-pressure Raman and optical absorption study Pramana - Journal of Physics, 27 (3). pp. 449-457. ISSN 0304-4289

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Official URL: http://www.ias.ac.in/j_archive/pramana/27/3/449-45...

Related URL: http://dx.doi.org/10.1007/BF02846870

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.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Lead Iodide; High Pressure Study; Raman Spectroscopy; Optical Absorption; 62.50; 64.70; 78.30
ID Code:96071
Deposited On:04 Dec 2012 10:27
Last Modified:19 May 2016 08:36

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