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Surface and subsurface structure of solids by laser photoacoustic spectroscopy
1.A. Rosencwaig, Rev. Sci. Instrum. 48, 1133 (1977) and references therein.
2.A. Rosencwaig and S. Gersho, J. Appl. Phys. 47, 64 (1976).
3.The samples are small pieces of turbine blade made of silicon‐nitride and appropriately sliced to the size of
4.It was noted that on the cross section after cutting the turbine blade into small pieces and ultrasonic cleaning, there exist spots of the size of beneath the surface. This we think may be due to nitrogen‐deficient clustering of the silicon atoms in the formation of the ceramic material.
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