Heat capacity of a white-eucalyptus biocarbon template for SiC/Si ecoceramics |
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| Authors: | L S Parfen’eva B I Smirnov I A Smirnova D Wlosewicz H Misiorek A Jezowski J Mucha A R de Arellano-Lopez J Martinez-Fernandez F M Varela-Feria A I Krivchikov |
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| Institution: | (1) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(2) Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, 50-950, Poland;(3) Universidad de Sevilla, Sevilla, 41080, Spain;(4) Institute for Low-Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkov, 31064, Ukraine |
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| Abstract: | The heat capacity C p of a biocarbon template based on white eucalyptus wood is measured at a constant pressure in the temperature range T = 3.5–300 K. The phonon mean free path l for a white-eucalyptus biocarbon template is calculated from the measured dependence C p (T) and data available in the literature on the phonon thermal conductivity and velocity of sound. It is established that, in the range 100–300 K, the phonon mean free path l is nearly constant and equal to ～13 Å. This value is close to the smallest size of graphite-like crystallites (～12 Å), which was derived earlier from x-ray diffraction data for a quasi-amorphous biocarbon template. |
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