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Thermal properties
Electrical resistivity and thermal conductivity of SiC/Si ecoceramics prepared from sapele wood biocarbon
L. S. Parfen'evaa,
T. S. Orlovaa,
B. I. Smirnova,
I. A. Smirnova,
H. Misiorekb,
J. Muchab,
A. Jezowskib,
A. Gutierrez-Pardoc,
J. Ramirez-Ricoc a Ioffe Institute, St. Petersburg
b Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences,
Wroclaw, Poland
c Dpto Fisica de la Materia Condensada–ICMSE Universidad de Sevilla,
Sevilla, Spain
Abstract:
Samples of
$\beta$-SiC/Si ecoceramics with a silicon concentration of
$\sim$21 vol% have been prepared using a series of consecutive procedures (carbonization of sapele wood biocarbon, synthesis of high-porosity biocarbon with channel-type pores, infiltration of molten silicon into empty channels of the biocarbon, formation of
$\beta$-SiC, and retention of residual silicon in channels of
$\beta$-SiC). The electrical resistivity
$\rho$ and thermal conductivity
$\varkappa$ of the
$\beta$-SiC/Si ecoceramic samples have been measured in the temperature range 5–300 K. The values of
$\rho_{\mathrm{Si}}^{\mathrm{chan}}(T)$ and
$\varkappa_{\mathrm{Si}}^{\mathrm{chan}}(T)$ have been determined for silicon Si
$^{\mathrm{chan}}$ located in
$\beta$-SiC channels of the synthesized
$\beta$-SiC/Si ecoceramics. Based on the performed analysis of the obtained results, the concentration of charge carriers (holes) in Si
$^{\mathrm{chan}}$ has been estimated as
$p\sim$ 10
$^{19}$ cm
$^{-3}$. The factors that can be responsible for such a high value of
$p$ have been discussed. The prospects for practical application of
$\beta$-SiC/Si ecoceramics have been considered.
Received: 14.03.2012
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