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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/7421

Title: Nature of confinement of phonons in nanocrystalline CVD diamond
Authors: ARORA, AK
RAVINDRAN, TR
REDDY, GLN
SIKDER, AK
MISRA, DS
Keywords: vapor-deposited diamond
thin-films
raman-spectroscopy
carbon-films
amorphous-carbon
microwave plasmas
optical phonons
fine-structure
scattering
nanoparticles
Issue Date: 2001
Publisher: ELSEVIER SCIENCE SA
Citation: DIAMOND AND RELATED MATERIALS, 10(8), 1477-1485
Abstract: Self-standing nanocrystalline CVD diamond sheets are investigated using Raman spectroscopy and X-ray diffraction. The sheets are composed of diamond phase and an amorphous-carbon-like non-diamond phase whose content increases with increasing gas pressure in the growth chamber. In the samples synthesised at high pressures the 1332 cm(-1) diamond Raman peak exhibits asymmetric broadening. Although the scattering from defects can account for the symmetric part of the line-width, the asymmetry is much more than expected for a confined phonon line-shape calculated according to the Gaussian confinement model for the particle sizes obtained from X-ray diffraction. An alternative model for the confinement of phonons is discussed which involves the standing waves arising from the reflection of the phonons from the elastic-dielectric boundary. The calculated line-shapes arising from the contributions from the allowed q-points in the Brillouin-zone are found to agree with the measured spectra. (C) 2001 .
URI: http://dx.doi.org/10.1016/S0925-9635(00)00616-6
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7421
http://hdl.handle.net/10054/7421
ISSN: 0925-9635
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