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UV Raman Scattering Analysis of Indented and Machined 6H-SiC and β-Si3N4 Surfaces

Published online by Cambridge University Press:  01 February 2011

Jennifer J.H. Walter ,
Mengning Liang ,
Xiang-Bai Chen ,
Jae-il Jang ,
Leah Bergman ,
John A. Patten ,
George M. Pharr  and
Robert J. Nemanich
Jennifer J.H. Walter
Affiliation:
Department of Physics, North Carolina State University, Raleigh, NC 27695–8202
Mengning Liang
Affiliation:
Department of Physics, North Carolina State University, Raleigh, NC 27695–8202
Xiang-Bai Chen
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83843
Jae-il Jang
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, and
Leah Bergman
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83843
John A. Patten
Affiliation:
Department of Manufacturing Engineering, Western Michigan University, Kalamazoo, MI 49008
George M. Pharr
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, and Metal and Ceramic Division, Oak Ridge National Lab, Oak Ridge, TN 37830
Robert J. Nemanich
Affiliation:
Department of Physics, North Carolina State University, Raleigh, NC 27695–8202
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Abstract

UV Raman scattering is employed as a nondestructive structure sensitive probe to investigate the vibrational properties of the wide bandgap, machined and indented surfaces of 6H-SiC and β-Si3N4. In these materials, the short absorption depth of UV light allows for accurate probing of the surface, and the transparency to visible light allows for analysis of the bulk material. The study on 6H-SiC (0001) included measurements of indentations, and of machined circular (0001) wafer edges. The indentation analysis indicates the response of the material to localized pressures. Machined 6H-SiC wafer edges and machined β-Si3N4 surfaces indicate a ductile response and ductile material removal for machining at cutting depths on a nm and μm scale. Raman scattering measurements of the ductile surfaces and ductile material removed indicate residual structure changes. The residual surface structures could indicate that a high-pressure phase transformation is the origin of a ductile response on machined brittle materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 843: Symposium T – Surface Engineering-Fundamentals and Applications , 2004 , T4.10
Copyright
Copyright © Materials Research Society 2005

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References

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