Thermopower coefficient of pine-wood biocarbon preforms and the biocarbon-preform/copper composites |
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Authors: | A T Burkov S V Novikov B I Smirnov I A Smirnov Cz Sulkovski and A Jezowski |
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Institution: | 1.Ioffe Physical-Technical Institute,Russian Academy of Sciences,St. Petersburg,Russia;2.Trzebiatowski Institute of Low Temperature and Structure Research,Polish Academy of Sciences,Wroclaw,Poland |
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Abstract: | The thermopower S(T) of the composites prepared by filling empty sap channels in high-porosity biocarbon preforms of white pine wood by melted
copper in vacuum and the thermopower S(T) of these preforms have been measured in the temperature range 5–300 K. The biocarbon preforms have been obtained by pyrolysis
of pine wood in an argon flow at two carbonization temperatures, 1000 and 2400°C. An analysis of the experimental data has
demonstrated that the thermopower of the composites is determined by the contribution related to the copper filling the channels
of the biocarbon preform and exhibits a characteristic temperature dependence with a deep minimum close to 20 K. This suggests
that copper in the preform channels is essentially a Kondo alloy with the iron and manganese impurities entering into it from
the carbon preform in the course of infiltration of melted copper. |
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