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The laser express technique has been applied to high temperature measurements of CVD diamond reflectivity R and absorption coefficient (alpha) for radiation with 1.06 mm wavelength as well as heat capacity. It was found that at T > 1000 degrees C and heating cycles of a few seconds the sample surface layer with thickness of 100 nm becomes graphitized that leads to dramatic growth of (alpha) from initial value of about 10 cm-1. The obtained results on heat capacity at T >= 800 degrees C are well matched with the known data at lower temperatures.
Vitali I. Konov,Serge V. Garnov,O. G. Tsarkova,E. D. Obraztsova,E. N. Lubnin, andFriedrich Dausinger
"Laser measurements of optical and thermal properties of CVD diamond at high temperatures", Proc. SPIE 3484, Lasers in Synthesis, Characterization, and Processing of Diamond, (20 October 1998); https://doi.org/10.1117/12.328211
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Vitali I. Konov, Serge V. Garnov, O. G. Tsarkova, E. D. Obraztsova, E. N. Lubnin, Friedrich Dausinger, "Laser measurements of optical and thermal properties of CVD diamond at high temperatures," Proc. SPIE 3484, Lasers in Synthesis, Characterization, and Processing of Diamond, (20 October 1998); https://doi.org/10.1117/12.328211