Nature of confinement of phonons in nanocrystalline CVD diamond

被引:22
作者
Arora, AK [1 ]
Ravindran, TR
Reddy, GLN
Sikder, AK
Misra, DS
机构
[1] Indira Gandhi Ctr Atom Res, Div Mat Sci, Kalpakkam 603102, Tamil Nadu, India
[2] Indian Inst Technol, Dept Phys, Bombay 400076, Maharashtra, India
关键词
CVD diamond; nanoparticles; phonons; Raman spectroscopy;
D O I
10.1016/S0925-9635(00)00616-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1477 / 1485
页数:9
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