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Thermal diffusivity measurements of natural and isotopically enriched diamond by picosecond infrared transient grating experiments

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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.

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Authors and Affiliations

  1. Department of Chemistry, Stanford University, 94305, Stanford, CA, USA

    A. Tokmakoff & M. D. Fayer

  2. GE Superabrasives, 6325 Huntley Rd., 43085, Worthington, OH, USA

    W. F. Banholzer

Authors
  1. A. Tokmakoff
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  2. W. F. Banholzer
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  3. M. D. Fayer
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Tokmakoff, A., Banholzer, W.F. & Fayer, M.D. Thermal diffusivity measurements of natural and isotopically enriched diamond by picosecond infrared transient grating experiments. Appl. Phys. A 56, 87–90 (1993). https://doi.org/10.1007/BF00351908

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  • DOI: https://doi.org/10.1007/BF00351908

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