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Isotope Effect in Thermal Conductivity of Polycrystalline CVD-Diamond: Experiment and Theory

1
National Research Center Kurchatov Institute, 123182 Moscow, Russia
2
Prokhorov General Physics Institute of Russian Academy of Science, 119991 Moscow, Russia
3
Harbin Institute of Technology, Harbin 150080, China
4
Kotel’nikov Institute of Radio Engineering and Electronics of Russian Academy of Science, 141120 Fryazino, Russia
*
Authors to whom correspondence should be addressed.
Academic Editor: Haitao Ye
Crystals 2021, 11(4), 322; https://doi.org/10.3390/cryst11040322
Received: 27 February 2021 / Revised: 17 March 2021 / Accepted: 22 March 2021 / Published: 24 March 2021
(This article belongs to the Special Issue Wide Bandgap Semiconductor)
We measured the thermal conductivity κ(T) of polycrystalline diamond with natural (natC) and isotopically enriched (12C content up to 99.96 at.%) compositions over a broad temperature T range, from 5 to 410 K. The high quality polycrystalline diamond wafers were produced by microwave plasma chemical vapor deposition in CH4-H2 mixtures. The thermal conductivity of 12C diamond along the wafer, as precisely determined using a steady-state longitudinal heat flow method, exceeds much that of the natC sample at T>60 K. The enriched sample demonstrates the value of κ(298K)=25.1±0.5 W cm1 K1 that is higher than the ever reported conductivity of natural and synthetic single crystalline diamonds with natural isotopic composition. A phenomenological theoretical model based on the full version of Callaway theory of thermal conductivity is developed which provides a good approximation of the experimental data. The role of different resistive scattering processes, including due to minor isotope 13C atoms, defects, and grain boundaries, is estimated from the data analysis. The model predicts about a 37% increase of thermal conductivity for impurity and dislocation free polycrystalline chemical vapor deposition (CVD)-diamond with the 12C-enriched isotopic composition at room temperature. View Full-Text
Keywords: polycrystal; cvd; diamond; thermal conductivity; isotope effect; phonon scattering; defect centers; dislocations polycrystal; cvd; diamond; thermal conductivity; isotope effect; phonon scattering; defect centers; dislocations
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MDPI and ACS Style

Inyushkin, A.V.; Taldenkov, A.N.; Ralchenko, V.G.; Bolshakov, A.P.; Khomich, A.V. Isotope Effect in Thermal Conductivity of Polycrystalline CVD-Diamond: Experiment and Theory. Crystals 2021, 11, 322. https://doi.org/10.3390/cryst11040322

AMA Style

Inyushkin AV, Taldenkov AN, Ralchenko VG, Bolshakov AP, Khomich AV. Isotope Effect in Thermal Conductivity of Polycrystalline CVD-Diamond: Experiment and Theory. Crystals. 2021; 11(4):322. https://doi.org/10.3390/cryst11040322

Chicago/Turabian Style

Inyushkin, Alexander V., Alexander N. Taldenkov, Victor G. Ralchenko, Andrey P. Bolshakov, and Alexander V. Khomich 2021. "Isotope Effect in Thermal Conductivity of Polycrystalline CVD-Diamond: Experiment and Theory" Crystals 11, no. 4: 322. https://doi.org/10.3390/cryst11040322

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