Abstract
THE thermal scattering of light in diamond has been studied in great detail by R. S. Krishnan1 and by V. Chandrasekharan2. These authors pointed out that the frequency shifts observed for the Brillouin components are not in good agreement with the values calculated using the elastic constants data of Bhagavantam and Bhimasenachar3. The values of the elastic constants have since been determined by Prince and Wooster4 and recently much more accurately by McSkimin and Bond5. McSkimin and Bond's values do not agree with those of Bhagavantam and Bhimasenachar and of Prince and Wooster, especially as regards C 12 and C 44. Using the values of McSkimin and Bond, the frequency shifts of the Brillouin components for the various orientations studied by Chandrasekharan with the bigger speetrograph were calculated, but the agreement with the experimental values was still unsatisfactory. We have therefore evaluated the elastic constants of diamond directly from the observed frequency shifts6.
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References
Krishnan, R. S., Proc. Ind. Acad. Sci., A, 26, 339 (1947).
Chandrasekharan, V., Proc. Ind. Acad. Sci., A, 32, 379 (1950).
Bhagavantam, S., and Bhimasenachar, J., Proc. Roy. Soc., A, 187, 381 (1946).
Prince, E., and Wooster, W. A., Acta Cryst., 6, 450 (1953).
McSkimin, H. J., and Bond, W. L., Phys. Rev., 105, 116 (1957).
Krishnan, R. S., Proc. Ind. Acad. Sci., A, 41, 91 (1955).
Miller, G. F., and Musgrave, M. J. P., Proc. Roy. Soc., A, 236, 352 (1956).
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Raman, C. V., and Viswanathan, K. S., Proc. Ind. Acad. Sci., A, 42, 1 and 51 (1955).
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Ramanathan, K. G., Proc. Ind. Acad. Sci., A, 26, 481 (1947).
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KRISHNAN, R., CHANDRASEKHARAN, V. & RAJAGOPAL, E. The Four Elastic Constants of Diamond. Nature 182, 518–520 (1958). https://doi.org/10.1038/182518b0
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DOI: https://doi.org/10.1038/182518b0
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