Thermal diffusivity measurements of natural and isotopically enriched diamond by picosecond infrared transient grating experiments
✍ Scribed by A. Tokmakoff; W. F. Banholzer; M. D. Fayer
- Publisher
- Springer
- Year
- 1993
- Tongue
- English
- Weight
- 350 KB
- Volume
- 56
- Category
- Article
- ISSN
- 1432-0630
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✦ Synopsis
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.