Considerable increase in thermal conductivity of a polycrystalline CVD diamond upon isotope enrichment
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We measured the temperature dependence of thermal conductivity of a polycrystalline CVD diamond with natural isotope composition and an isotope enriched (99.96% 12C) sample at temperatures from 5 to 420 K. The isotope enriched diamond demonstrates a considerable growth of thermal conductivity at temperatures above 80 K compared to the diamond with natural composition of isotopes. At room temperature the thermal conductivity reaches 24.3 W·cm−1K−1, and the isotope effect makes up not less than 34%.
KeywordsThermal Conductivity LEBEDEV Physic Institute Isotope Enrichment Prokhorov General Physics Institute Plate Plane
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