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This article is cited in 5 scientific papers (total in 5 papers)
PHYSICS
Heat-treated nano-structured shungite rocks and electrophysical properties associated
S. V. Kovalevskiia, I. A. Moshnikovb, V. V. Kovalevskiia a “Shungiton” Ltd Company, Petrozavodsk, Russia
b Institute of Geology, Karelian Research Center, RAS, Petrozavodsk, Russia
Abstract:
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, carbon nano-sized shells and fibers, SiC nano-sized fibers, shielding effectiveness, electrical conductivity.
Received: 06.03.2018 Revised: 13.06.2018
Citation:
S. V. Kovalevskii, I. A. Moshnikov, V. V. Kovalevskii, “Heat-treated nano-structured shungite rocks and electrophysical properties associated”, Nanosystems: Physics, Chemistry, Mathematics, 9:4 (2018), 468–472
Linking options:
https://www.mathnet.ru/eng/nano331 https://www.mathnet.ru/eng/nano/v9/i4/p468
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