EPR and magnetism of the nanostructured natural carbonaceous material shungite

Physics and Chemistry of Minerals - Tập 37 - Trang 237-247 - 2009
Maria Aldona Augustyniak-Jabłokow1, Yurii V. Yablokov1, Bartłomiej Andrzejewski1, Wojciech Kempiński1, Szymon Łoś1, Krzysztof Tadyszak1, Mikhail Y. Yablokov2, Valentin A. Zhikharev3
1Institute of Molecular Physics, PAS, Poznan, Poland
2N.S. Enikolopov Institute of Synthetic Polymer Materials, RAS, Moscow, Russia
3Kazan Technological University, Kazan, Russia

Tóm tắt

The X-band EPR and magnetic susceptibility in the temperature range 4.2–300 K study of the shungite-I, natural nanostructured material from the deposit of Shunga are reported. Obtained results allow us to assign the EPR signal to conduction electrons, estimate their number, N P, and evaluate the Pauli paramagnetism contribution to shungite susceptibility. A small occupation (~5%) of the localized nonbonding π states in the zigzag edges of the open-ended graphene-like layers and/or on σ (sp 2+x ) orbitals in the curved parts of the shungite globules has been also revealed. The observed temperature dependence of the EPR linewidth can be explained by the earlier considered interaction of conduction π electrons with local phonon modes associated with the vibration of peripheral carbon atoms of the open zigzag-type edges and with peripheral carbon atoms cross-linking different nanostructures. The relaxation time T 2 and diffusion time T D are found to have comparable values (2.84 × 10−8 and 1.73 × 10−8 s at 5.2 K, respectively), and similar dependence on temperature. The magnetic measurements have revealed the suppression of orbital diamagnetism due to small amount of large enough fragments of the graphene layers.

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Physics and Chemistry of Minerals

Tập 37

237-247

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