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Thermal conductivity of high-porosity biocarbon preforms of beech wood

Parfen’eva, L. S. and Orlova, T. S. and Kartenko, N. F. and Sharenkova, N. V. and Smirnov, B. I. and Smirnov, I. A. and Misiorek, H. and Jezowski, A. and Wilkes, T. E. and Faber, K. T. (2010) Thermal conductivity of high-porosity biocarbon preforms of beech wood. Physics of the Solid State, 52 (6). pp. 1115-1122. ISSN 1063-7834.

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This paper reports on measurements performed in the temperature range 5–300 K for the thermal conductivity κ and electrical resistivity ρ of high-porosity (cellular pores) biocarbon preforms prepared by pyrolysis (carbonization) of beech wood in an argon flow at carbonization temperatures of 1000 and 2400°C. X-ray structure analysis of the samples has been performed at 300 K. The samples have revealed the presence of nanocrystallites making up the carbon matrices of these biocarbon preforms. Their size has been determined. For samples prepared at T_(carb) = 1000 and 2400°C, the nanocrystallite sizes are found to be in the ranges 12–25 and 28–60 Å, respectively. The dependences κ(T) are determined for the samples cut along and across the tree growth direction. The thermal conductivity κ increases with increasing carbonization temperature and nanocrystallite size in the carbon matrix of the sample. Thermal conductivity measurements conducted on samples of both types have revealed an unusual temperature dependence of the phonon thermal conductivity for amorphous materials. As the temperature increases from 5 to 300 K, it first increases in proportion to T, to transfer subsequently to ~T^(1.5) scaling. The results obtained are analyzed.

Item Type:Article
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Faber, K. T.0000-0001-6585-2536
Additional Information:© 2010 Pleiades Publishing, Ltd. Original Russian Text © L.S. Parfen’eva, T.S. Orlova, N.F. Kartenko, N.V. Sharenkova, B.I. Smirnov, I.A. Smirnov, H. Misiorek, A. Jezowski, T.E. Wilkes, K.T. Faber, 2010, published in Fizika Tverdogo Tela, 2010, Vol. 52, No. 6, pp. 1045–1052. Received September 2, 2009. Translated by G. Skrebtsov. This study was supported by the Russian Foundation for Basic Research (project no. 07-03-91353 NNF_a) and the Presidium of the Russian Academy of Sciences (programs P-03 and P-27). The financial support for T.E.W and K.T.F. from the U.S. National Science Foundation under grant DMR-0710630 is gratefully acknowledged.
Funding AgencyGrant Number
Russian Foundation for Basic Research07-03-91353 NNF_a
Presidium of the Russian Academy of SciencesP-03
Presidium of the Russian Academy of SciencesP-27
Issue or Number:6
Record Number:CaltechAUTHORS:20140716-074513492
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47251
Deposited By: Tony Diaz
Deposited On:16 Jul 2014 17:07
Last Modified:03 Mar 2020 13:01

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