Measurement of thermal conductivity of polycrystalline CVD diamond by laser-induced transient grating technique
- B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk (Belarus)
- Natural Science Center, A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
- Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow (Russian Federation)
The tangential thermal diffusivity D{sub ||} and thermal conductivity k{sub ||} of diamond plates grown from the gaseous phase by chemical vapour deposition (CVD diamond) are determined by the transient grating technique in the temperature range 25 - 200 {sup 0}C. Samples of insulating and boron-doped polycrystalline diamond of thickness about 0.3 mm and diameter 63 mm were synthesised in a microwave discharge in mixtures of methane and hydrogen. In view of the intense light scattering by the samples, a photosensitive grating recording technique was developed and used for measurements. It was found that the value k{sub ||} amounts to 18 - 20 W cm{sup -1} K{sup -1} at room temperature, approaching the thermal conductivity of the highest purity single crystals of diamond. A comparison of the value of k{sub ||} with the normal thermal conductivity k{sub perpendicular} determined by the flash method reveals a thermal conductivity anisotropy of about 10% - 20% associated with the texture of the diamond film, the normal component of thermal conductivity being larger than the tangential component. Boron-doped diamond displays a dependence of the transient grating kinetics on the excitation wavelength. The obtained results indicate that CVD diamond is a promising material for preparing efficient heat sinks, especially of large size, used in microelectronic devices and laser engineering. (laser applications and other topics in quantum electronics)
- OSTI ID:
- 21454780
- Journal Information:
- Quantum Electronics (Woodbury, N.Y.), Vol. 32, Issue 4; Other Information: DOI: 10.1070/QE2002v032n04ABEH002200; ISSN 1063-7818
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
BORON
CHEMICAL VAPOR DEPOSITION
CRYSTAL GROWTH
DIAMONDS
DOPED MATERIALS
EXCITATION
GRATINGS
HEAT SINKS
HIGH-FREQUENCY DISCHARGES
HYDROGEN
LASERS
LIGHT SCATTERING
METHANE
MONOCRYSTALS
PLATES
POLYCRYSTALS
TEMPERATURE RANGE 0273-0400 K
THERMAL CONDUCTIVITY
THERMAL DIFFUSIVITY
THIN FILMS
WAVELENGTHS
ALKANES
CARBON
CHEMICAL COATING
CRYSTALS
DEPOSITION
ELECTRIC DISCHARGES
ELEMENTS
ENERGY-LEVEL TRANSITIONS
FILMS
HYDROCARBONS
MATERIALS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SEMIMETALS
SINKS
SURFACE COATING
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES