ISSN:
1432-0630
Keywords:
66.10.Cb
;
62.65.+k
;
42.65.Ft
;
42.65.Ky
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract The thermal diffusivity of natural abundance and isotopically enhanced, synthetic, diamond crystals have been directly measured by picosecond infrared transient grating experiments operating on a microscopic distance scale. Transient gratings do not require contact to the sample, and are not limited by sample size, or complicated modeling or fitting of the data. Single crystal type-IIA diamond samples with natural abundance of 12C (98.9%) and enriched 12C isotopic abundance (99.9%) gave diffusivity constants of 7.8 cm2/s and 12.0 cm2/s, respectively, at room temperature. These results confirm previous measurements of a 50% increase in the thermal conductivity of isotopically enhanced diamond. Variations in the thermal diffusivity of up to 50% were observed from point to point in both samples.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00351908
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