Geodesic
Heat-treated nano-structured shungite rocks and electrophysical properties associated
Nanosistemy: fizika, himiâ, matematika, Tome 9 (2018) no. 4, pp. 468-472.

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Shungite rocks of two different types were treated at $\sim$ 1400$^\circ$C and a set of nanomaterials have been obtained. Among the different materials obtained were: carbon hollow fibers; spherical or ellipsoid particles; silicon carbide amorphous; crystalline nanofibers and nanoparticles having different morphologies; iron and iron silicide nanoparticles encapsulated into carbon shells. Measurements were performed for shielding effectiveness (SE) and the electrical conductivity ($\sigma$) of untreated and heat-treated shungite rocks. The shungite rock with dominated hyperfullerene carbon is remarkable for a two-fold increase in the $\sigma$ and a 10 dB increase in SE with a slight decrease of the carbon content by 1.5% in relation to the untreated sample. In contrast, the treated shungite rock with high SiC nanofiber content is characterized by a halving of the $\sigma$ and a 10 dB decrease in SE with a decrease of the carbon content by 6% relative to the original sample.
Keywords: shungite rocks, carbon nano-sized shells and fibers, SiC nano-sized fibers, shielding effectiveness, electrical conductivity.
Mots-clés : carbon 
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     author = {S. V. Kovalevskii and I. A. Moshnikov and V. V. Kovalevskii},
     title = {Heat-treated nano-structured shungite rocks and electrophysical properties associated},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {468--472},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2018_9_4_a3/}
}
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S. V. Kovalevskii; I. A. Moshnikov; V. V. Kovalevskii. Heat-treated nano-structured shungite rocks and electrophysical properties associated. Nanosistemy: fizika, himiâ, matematika, Tome 9 (2018) no. 4, pp. 468-472. http://geodesic.mathdoc.fr/item/NANO_2018_9_4_a3/