Dear researchers,
I would be happy to get your suggestions on my above question.
We are looking for the measurement of dislocation density in CVD grown diamond single crystals. Is there any possibility to identify the defects through thermal conductivity measurement?
OR
Is there any cost effective analysis technique which can give preliminary indirect or direct confirmation of defect in diamonds?
Looking for your answers and suggestions.
Thank you in advance..
Anthony, T. R., W. F. Banholzer, J. Fl Fleischer, Lanhua Wei, P. K. Kuo, R. L. Thomas, and R. W. Pryor. "Thermal diffusivity of isotopically enriched C 12 diamond." Physical Review B 42, no. 2 (1990): 1104.
Hello Dr. Dadadia,
principally the answer is easy. The thermal conductivity within an undisturbed periodic lattice is infinitely. Every defect reduces the mean free path (for phonons and electrons, resp.). Therefore, it is clear, that dislocations reduce the thermal conductivity.
Practically, it means a high work load to carry out such measurements. I would recommend laser based methods to get such informations. These measurements could be carried out as a function of temperature. By such measurements a sample is heated by a laser pulse and you detect the time depended infrared signal from the sample. Therefrom the thermal conductivity follows.
With Regsrd
R. Mitdank
you can make use from these links
Article Effects of defects on the effective thermal conductivity of ...
https://www.coursera.org/lecture/advanced-functional-ceramics/2-5-defects-vs-properties-thermal-conductivity-w7sUe
https://arxiv.org/ftp/arxiv/papers/1603/1603.05286.pdf
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