2 September 2003 Laser-induced transient gratings application for measurement of thermal conductivity of CVD diamond
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Proceedings Volume 5121, Laser Processing of Advanced Materials and Laser Microtechnologies; (2003) https://doi.org/10.1117/12.515609
Event: Laser Processing of Advanced Materials and Laser Microtechnologies, 2002, Moscow, Russian Federation
Abstract
In-plane DII (kII) and normal D⊥ (k⊥) thermal diffusivity (thermal conductivity) of CVD diamond plates have been measured by method of transient gratings and laser flash technique. Samples of insulating and semiconducting boron-doped polycrystalline diamond were synthesized in microwave plasma maintained in methane-hydrogen mixtures. Averaged over the film thickness kII values at room temperature are determined to be in the range of 15-20 W/cmK approaching to those known for single crystal diamonds. From comparison of kII and k⊥ values a thermal anisotropy of 10-20% for in-plane and normal directions (k⊥ > kII) is found, this being ascribed to specific columnar growth of diamond grains. A strong variation (up to 2.7 times) in thermal conductivity across film thickness is revealed for selected specimens using a quasi-surface thermal grating excitation in VUV spectral range. In this case an additional fast-decay diffraction is observed due to nonthermal, owing to generated free charge carriers, recording of the grating.
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E. V. Ivakin, E. V. Ivakin, A. V. Sukhadolau, A. V. Sukhadolau, Victor G. Ralchenko, Victor G. Ralchenko, A. V. Vlasov, A. V. Vlasov, "Laser-induced transient gratings application for measurement of thermal conductivity of CVD diamond", Proc. SPIE 5121, Laser Processing of Advanced Materials and Laser Microtechnologies, (2 September 2003); doi: 10.1117/12.515609; https://doi.org/10.1117/12.515609
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