Thermal conductivity of polycrystalline CVD diamond: Experiment and theory

Journal Article · Mon Sep 15 04:00:00 EDT 2008 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776108090136· OSTI ID:21241934

Taldenkov, A N ^[1]; Ral'chenko, V G; Konov, V I ^[2]; Khomich, A V ^[3]; Khmel'nitskii, R A ^[4]

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1. Russian Research Center Kurchatov Institute (Russian Federation)
2. Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)
3. Russian Academy of Sciences, Institute of Radio Engineering and Electronics (Fryazino branch) (Russian Federation)
4. Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation)

The temperature dependences of thermal conductivity {kappa} 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{sup o}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{sup o}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.

• OSTI ID: 21241934
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 3 Vol. 107; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
CHEMICAL VAPOR DEPOSITION
CRYSTAL DEFECTS
DIAMONDS
DIFFUSE SCATTERING
PHONONS
POLYCRYSTALS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
THERMAL CONDUCTIVITY