Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
64 (1994), S. 2549-2551
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The thermal conductivity κ of an isotopically enriched (0.055% 13C) polycrystalline diamond plate made by chemical vapor deposition (CVD) has been measured for heat flowing in a direction either parallel (κ(parallel)) or perpendicular (κ⊥) to the plane of the plate. The room-temperature conductivities (κ(parallel)=21.8 and κ⊥=26 W cm−1 K−1) are higher than for any CVD diamond previously reported, and the κ⊥ value is higher than the best gem-quality single crystal with the natural abundance (1.1%) of 13C. Analysis of the temperature dependence of κ(parallel) reveals that the point-defect scattering of phonons is in fact significantly lower than expected for the natural abundance of 13C and that it is responsible for the improved conductivity. The observed anisotropy κ(parallel)/κ⊥=0.84 at room temperature is associated with the anisotropic grain structure.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.111570
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