Effect of high pressure on the vibrational modes and the energy gap of ZnP2

Jayaraman, A. ; Maines, R. G. ; Chattopadhyay, T. (1986) Effect of high pressure on the vibrational modes and the energy gap of ZnP2 Pramana - Journal of Physics, 27 (1-2). pp. 291-297. ISSN 0304-4289

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Official URL: http://www.ias.ac.in/j_archive/pramana/27/1-2/291-...

Related URL: http://dx.doi.org/10.1007/BF02846343


The pressure dependence of the vibrational modes in ZnP2 has been investigated by Raman Spectroscopy using a diamond anvil cell, up to 150 kbar pressure. The intrachain phosphorus modes exhibit a strong pressure dependence whereas the low frequency Zn-P modes soften very slightly under pressure. For a crystal which is treated as a molecular crystal this is an unexpected result. It is suggested that the behaviour may be due to a buckling of the phosphorus chain, or due to a double bond promotion between P atoms, or a charge transfer under pressure. The shift in the energy gap has also been measured to 100 kbar hydrostatic pressure. There is a small initial blue shift which gradually changes over to a red shift. However the whole shift in 100 kbar is quite small. Combining the (dEg/dP) T with the published (dEg/dT) P the thermal expansion contribution and the electron-phonon interaction contribution were evaluated. The latter dominates the total (dEg/dT) P of ZnP2.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:ZnP2; Vibrational Modes; High Pressure Studies; Energy Gap; Raman Spectroscopy; 62.50; 78.30
ID Code:96073
Deposited On:04 Dec 2012 10:23
Last Modified:19 May 2016 08:36

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