Improved thermal conductivity in isotopically enriched chemical vapor deposited diamond

Autor:	Thomas M. Hartnett, J. E. Graebner, Richard P. Miller
Rok vydání:	1994
Předmět:	Thermal conductivity Materials science Physics and Astronomy (miscellaneous) Scattering Phonon Analytical chemistry engineering Diamond Chemical vapor deposition engineering.material Conductivity Anisotropy Single crystal
Zdroj:	Applied Physics Letters. 64:2549-2551
ISSN:	1077-3118 0003-6951
Popis:	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∥) or perpendicular (κ⊥) to the plane of the plate. The room‐temperature conductivities (κ∥=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∥ 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∥/κ⊥=0.84 at room temperature is associated with the anisotropic grain structure.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0059fe44635afbace9b9bb4d572578da https://doi.org/10.1063/1.111570 Zobrazit plný text záznamu