High-pressure Raman study of the optic-phonon modes in BeO

Kourouklis, G. ; Sood, A. ; Hochheimer, H. ; Jayaraman, A. (1985) High-pressure Raman study of the optic-phonon modes in BeO Physical Review B, 31 (12). pp. 8332-8334. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v31/i12/p8332_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.31.8332


The shift with pressure of the transverse optic-phonon-mode frequencies in BeO has been measured up to 20 GPa at 25 K by Raman scattering, using a diamond anvil cell. The mode Grüneisen parameters have been determined from the pressure data and are compared with the systematics observed in III-V and other II-VI compounds. The total energy calculations of Chang and Cohen predict a pressure-induced transition from wurtzite to NaCl-type phase at about 20 GPa. Unfortunately the pressure limit in the present study is inadequate to demonstrate this transition, for it stops just near the predicted transition pressure, and would almost surely require considerable over pressure.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:96069
Deposited On:04 Dec 2012 10:28
Last Modified:04 Dec 2012 10:28

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