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Fizika Tverdogo Tela, 2019, Volume 61, Issue 10, Pages 1799–1805
DOI: https://doi.org/10.21883/FTT.2019.10.48251.477
(Mi ftt8657)
 

Magnetism

Magnetic properties of fullerene–thermally exfoliated graphite composites doped with sodium

V. I. Berezkina, V. V. Popovb, S. V. Kidalovb, N. V. Sharenkovab

a Scientific Research Center for Ecological Safety at the Russian Academy of Sciences, St. Petersburg
b Ioffe Institute, St. Petersburg
Abstract: The magnetic properties (field range $H$ = 0–50 kOe, temperature range $T$ = 3–300 K), and structural features of a sodium-doped carbon composite material based on fullerene $C_{60}$ and thermally exfoliated graphite (TEG) are studied. The material is obtained with different ratios of the components by sintering at a pressure of 7 GPa and $T$ = 600$^{\circ}$C, at which it is found that significant amorphization of the crystal lattice of the initial $C_{60}$ occurs. The dia-, para-, and ferromagnetic components ($M_D$, $M_{PM}$, and $M_{FM}$) were separated from the total magnetic moment of the samples under study. It is found that a sodium dopant has no effect on the magnetic properties of the composite. Analysis of the $M _{PM}(H)$ field dependences by using the Brillouin function for the fullerene-containing sample (i.e., without TEG) makes it possible to determine the quantum number of the total angular momentum of paramagnetic (PM) centers. Its value is found to be $J$ = 1, which corresponds to elementary magnetic moment $\mu_{PM}$ = 2$\mu_B$ of a PM center. The concentration of PM centers is estimated at the level of $N_{PM}\approx$ (2 - 5) $\times$ 10$^{18}$ g$^{-1}$ for most samples, including the material without TEG. The introduction of TEG into the initial composition and an increase in its proportion in the composite leads to a strong increase in the magnetic moment, which is explained by an increase in both the $J$ value and the concentration of PM centers.
Keywords: fullerenes, graphite, carbon composites, magnetic properties.
Funding agency Grant number
Ministry of Education and Science of the Russian Federation
This work was performed within the framework of State Topical Studies of the Ioffe Institute, Russian Academy of Sciences, entitled “Physical and Chemical Fundamentals of the Technology of Novel Functional Materials Based on Carbon Nanostructures”.
Received: 13.05.2019
English version:
Physics of the Solid State, 2019, Volume 61, Issue 10, Pages 1752–1758
DOI: https://doi.org/10.1134/S106378341910010X
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: V. I. Berezkin, V. V. Popov, S. V. Kidalov, N. V. Sharenkova, “Magnetic properties of fullerene–thermally exfoliated graphite composites doped with sodium”, Fizika Tverdogo Tela, 61:10 (2019), 1799–1805; Phys. Solid State, 61:10 (2019), 1752–1758
Citation in format AMSBIB
\Bibitem{BerPopKid19}
\by V.~I.~Berezkin, V.~V.~Popov, S.~V.~Kidalov, N.~V.~Sharenkova
\paper Magnetic properties of fullerene--thermally exfoliated graphite composites doped with sodium
\jour Fizika Tverdogo Tela
\yr 2019
\vol 61
\issue 10
\pages 1799--1805
\mathnet{http://mi.mathnet.ru/ftt8657}
\crossref{https://doi.org/10.21883/FTT.2019.10.48251.477}
\elib{https://elibrary.ru/item.asp?id=41174919}
\transl
\jour Phys. Solid State
\yr 2019
\vol 61
\issue 10
\pages 1752--1758
\crossref{https://doi.org/10.1134/S106378341910010X}
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