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- Title
Thermal conductivity of polycrystalline CVD diamond: Experiment and theory.
- Authors
Inyushkin, A. V.; Taldenkov, A. N.; Ral'chenko, V. G.; Konov, V. I.; Khomich, A. V.; Khmel'nitskiĭ, R. A.
- Abstract
The temperature dependences of thermal conductivity κ of polycrystalline CVD diamond are measured in the temperature range from 5 to 410 K. The diamond sample is annealed at temperatures sequentially increasing from 1550 to 1690°C to modify the properties of the intercrystallite contacts in it. As a result of annealing, the thermal conductivity decreases strongly at temperatures below 45 K, and its temperature dependence changes from approximately quadratic to cubic. At T > 45 K, the thermal conductivity remains almost unchanged upon annealing at temperatures up to 1650°C and decreases substantially at higher annealing temperatures. The experimental data are analyzed in terms of the Callaway theory of thermal conductivity [9], which takes into account the specific role of normal phonon-phonon scattering processes. The thermal conductivity is calculated with allowance for three-phonon scattering processes, the diffuse scattering by sample boundaries, the scattering by point and extended defects, the specular scattering by crystallite boundaries, and the scattering by intercrystallite contacts. A model that reproduces the main specific features of the thermal conductivity of CVD diamond is proposed. The phonon scattering by intercrystallite contacts plays a key role in this model.
- Subjects
POLYCRYSTALS; DIAMONDS; ANNEALING of crystals; THERMAL conductivity; THERMAL conductivity measurement; TRANSPORT theory; PHONONS
- Publication
Journal of Experimental & Theoretical Physics, 2008, Vol 107, Issue 3, p462
- ISSN
1063-7761
- Publication type
Article
- DOI
10.1134/S1063776108090136