Heat-treated nano-structured shungite rocks and electrophysical properties associated
https://doi.org/10.17586/2220-8054-2018-9-4-468-472
Abstract
Shungite rocks of two different types were treated at ∼ 1400 ◦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 (σ) of untreated and heat-treated shungite rocks. The shungite rock with dominated hyperfullerene carbon is remarkable for a two-fold increase in the σ 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 σ 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
Supporting agencies: The work is performed in the framework of the research, PFNI GAN “Geology and Genesis of deposits, Mineralogy and Technology of Shungite rocks of Onega structure” (number of state registration of AAAA-A18- 118020690238-0).
About the Authors
S. V. Kovalevskii
“Shungiton” Ltd Company
Russian Federation
Russian Federation
Petrozavodsk
I. A. Moshnikov
Institute of Geology, Karelian Research Center, RAS
Russian Federation
Russian Federation
Petrozavodsk
V. V. Kovalevski
Institute of Geology, Karelian Research Center, RAS
Russian Federation
Russian Federation
Petrozavodsk
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Review
For citations:
Kovalevskii S.V., Moshnikov I.A., Kovalevski V.V. Heat-treated nano-structured shungite rocks and electrophysical properties associated. Nanosystems: Physics, Chemistry, Mathematics. 2018;9(4):468-472. https://doi.org/10.17586/2220-8054-2018-9-4-468-472
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