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Thermal conductivity of high-porosity biocarbon precursors of white pine 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. (2008) Thermal conductivity of high-porosity biocarbon precursors of white pine wood. Physics of the Solid State, 50 (12). pp. 2245-2255. ISSN 1063-7834.

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This paper reports on measurements of the thermal conductivity κ and the electrical conductivity σ of high-porosity (cellular pores) biocarbon precursors of white pine tree wood in the temperature range 5–300 K, which were prepared by pyrolysis of the wood at carbonization temperatures (T_(carb)) of 1000 and 2400°C. The x-ray structural analysis has permitted the determination of the sizes of the nanocrystallites contained in the carbon framework of the biocarbon precursors. The sizes of the nanocrystallites revealed in the samples prepared at T_(carb) = 1000 and 2400°C are within the ranges 12–35 and 25–70 Å, respectively. The dependences κ(T) and σ(T) are obtained for samples cut along the tree growth direction. As follows from σ(T) measurements, the biocarbon precursors studied are semiconducting. The values of κ and σ increase with increasing carbonization temperature of the samples. Thermal conductivity measurements have revealed that samples of both types exhibit a temperature dependence of the phonon thermal conductivity κ_(ph), which is not typical of amorphous (and amorphous to x-rays) materials. As the temperature increases, κ_(ph) first varies proportional to T, to scale subsequently as ∼T ^(1.7). The results obtained are analyzed.

Item Type:Article
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Faber, K. T.0000-0001-6585-2536
Additional Information:© 2008 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, 2008, published in Fizika Tverdogo Tela, 2008, Vol. 50, No. 12, pp. 2150–2159. Received April 14, 2008. 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 (program P-03_02). The financial support for T.E.W and K.T.F. from the US 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_02
Issue or Number:12
Classification Code:PACS: 72.80.Tm, 65.60.+a
Record Number:CaltechAUTHORS:20140716-083406553
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47254
Deposited By: Tony Diaz
Deposited On:16 Jul 2014 17:05
Last Modified:03 Mar 2020 13:01

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