Effect of excitation wavelength on the Raman scattering from optical phonons in silicon carbide monofilaments

2007 ◽  
Vol 102 (2) ◽  
pp. 023512 ◽  
Author(s):  
Yanling Ward ◽  
Robert J. Young ◽  
Robert A. Shatwell
Keyword(s):  
Silicon Carbide ◽  
Raman Scattering ◽  
Excitation Wavelength ◽  
Optical Phonons

MeV Self Ion Beam Induced Amorphisation of Silicon Carbide Surfaces and Its Effect on Their Trdbomechanical Propertdzs

1991 ◽  
Vol 235 ◽  
Author(s):  
D. K. Sood ◽  
V. C. Nath ◽  
Yang Xi
Keyword(s):  
Silicon Carbide ◽  
Raman Scattering ◽  
High Precision ◽  
Friction And Wear ◽  
Ion Beam ◽  
Steel Ball ◽  
Carbon Ions ◽  
Ion Energy ◽  
Number Of Cycles ◽  
Tribomechanical Properties

ABSTRACTAmorphisation of sintered SiC by bombardment with self (C, Si) ions has been studied. Ion doses ranged from 1×1015 to 1×1017 ions/cm2; and ion energy was varied from 0.09 to 5 MeV. Amorphisation was detected by micro-focus Raman scattering. Tribomechanical properties-friction and wear were studied with a high precision pin (steel ball) and disc (implanted) machine. Results show substantial improvements in friction and wear, which persist to a large number of cycles. Tribomechanical properties are shown to correlate with surface amorphisation and carburisation. Carbon ions are found to be much more effective than Si ions (with similar damage distributions) in reducing friction and wear.

scholarly journals Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/Nanocrystals

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2296 ◽  
Author(s):  
Yao Huang ◽  
Run Yang ◽  
Shijie Xiong ◽  
Jian Chen ◽  
Xinglong Wu
Keyword(s):  
Silicon Carbide ◽  
Electrical Properties ◽  
Raman Scattering ◽  
Film Thickness ◽  
Strong Coupling ◽  
Energy Gaps ◽  
Longitudinal Optic ◽  
Transverse Optic

Silicon carbide (SiC) has a large number of polytypes of which 3C-, 4H-, 6H-SiC are most common. Since different polytypes have different energy gaps and electrical properties, it is important to identify and characterize various SiC polytypes. Here, Raman scattering is performed on 6H-SiC micro/nanocrystal (MNC) films to investigate all four folded transverse optic (TO) and longitudinal optic (LO) modes. With increasing film thickness, the four folded TO modes exhibit the same frequency downshift, whereas the four folded LO modes show a gradually-reduced downshift. For the same film thickness, all the folded modes show larger frequency downshifts with decreasing MNC size. Based on plasmons on MNCs, these folded modes can be attributed to strong coupling of the folded phonons with plasmons which show different strengths for the different folded modes while changing the film thickness and MNC size. This work provides a useful technique to identify SiC polytypes from Raman scattering.

Raman Scattering by Optical Phonons in a Highly Strained InAs/GaAs Monolayer

1999 ◽  
Vol 215 (1) ◽  
pp. 419-424 ◽  
Author(s):  
S. Reich ◽  
A.R. Go�i ◽  
C. Thomsen ◽  
F. Heinrichsdorff ◽  
A. Krost ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Optical Phonons ◽  
Highly Strained
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