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Pressure-induced band gap reduction, orientational ordering and reversible amorphization in single crystals of C70: Photoluminescence and Raman studies

Sood, AK and Chandrabhas, N and Mumu, DVS and Hariharan, Y and Bharathi, A and Sundar, CS (1994) Pressure-induced band gap reduction, orientational ordering and reversible amorphization in single crystals of C70: Photoluminescence and Raman studies. In: Philosophical Magazine Part B: Physics of Condensed Matter. Electronics, Optical and Magnetic Properties, 70 (3). pp. 347-358.

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Official URL: http://www.informaworld.com/smpp/content~db=all~co...

Abstract

Photoluminescence and Raman scattering experiments have been carried out on single crystals of C70 up to 31 GPa to investigate the effect of pressure on the optical band gap, vibrational modes and stability of the molecule. The photoluminescence band shifts to lower energies and the pressure dependence of the band maxima yields the hydrostatic deformation potential to be 2.15 eV. The slope changes in the pressure dependence of peak positions and linewidths of the Raman modes associated with the intramolecular vibrations at 1 GPa mark the known face-centred cubic-->rhombohedral orientational ordering transition. The reversible amorphization in C70 at P > 20 GPa has been compared with the irreversible amorphization in C60 at P > 22 GPa in terms of carbon-carbon distance between the neighbouring molecules at the threshold transition pressures, in conjunction with the interplay between the intermolecular and intramolecular interactions.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Taylor and francis group.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 11 Apr 2011 06:02
Last Modified: 11 Apr 2011 06:02
URI: http://eprints.iisc.ernet.in/id/eprint/36703

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