Nature of confinement of phonons in nanocrystalline CVD diamond
DSpace at IIT Bombay
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Title |
Nature of confinement of phonons in nanocrystalline CVD diamond
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Creator |
ARORA, AK
RAVINDRAN, TR REDDY, GLN SIKDER, AK MISRA, DS |
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Subject |
vapor-deposited diamond
thin-films raman-spectroscopy carbon-films amorphous-carbon microwave plasmas optical phonons fine-structure scattering nanoparticles cvd diamond nanoparticles phonons raman spectroscopy |
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Description |
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 .
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Publisher |
ELSEVIER SCIENCE SA
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Date |
2011-07-28T14:07:27Z
2011-12-26T12:59:37Z 2011-12-27T05:52:08Z 2011-07-28T14:07:27Z 2011-12-26T12:59:37Z 2011-12-27T05:52:08Z 2001 |
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Type |
Article
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Identifier |
DIAMOND AND RELATED MATERIALS, 10(8), 1477-1485
0925-9635 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 |
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Language |
en
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