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Academic Journal

Concentration of paramagnetic centres at low-temperature thermal destruction of asphaltenes of heavy petroleum distillates.

Authors:Dolomatov, M. U.1,2, Rodionov, A. A.3, Gafurov, M. R.3 Marat.Gafurov@kpfu.ru, Petrov, A. V.4, Biktagirov, T. B.3, Bakhtizin, R. Z.1, Makarchikov, S. O.3, Khairudinov, I. Z.4, Orlinskii, S. B.3

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 1, p1-7. 7p.

Subject Terms:*PARAMAGNETIC materials, *CHEMICAL bonds, *FREE radicals (Chemistry), *ASPHALTENE, *THERMOLYSIS, *RECOMBINATION (Chemistry)

Abstract:Changes of paramagnetic centers (PC) concentration in dispersed petroleum systems were studied in the process of low-temperature thermolysis. The kinetic model of PC concentration dynamics based on the processes of unpaired electrons formation during singlet-triplet transitions, weak chemical bonds dissociation and recombination of free radicals is proposed. [ABSTRACT FROM AUTHOR]

:Copyright of Magnetic Resonance in Solids is the property of Magnetic Resonance in Solids, Electronic Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Academic Journal

Magnetic properties and spin kinetics in Kondo lattices.

Authors:Belov, S. I.1 Sergei.Belov@kpfu.ru, Kutuzov, A. S.1

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 1, p1-9. 9p.

Subject Terms:*KONDO effect, *MAGNETIC properties, *ANALYTICAL mechanics, *MAGNETIC susceptibility, *ELECTRON paramagnetic resonance

Abstract:We present a theoretical model to describe unusual properties of Kondo lattices. The influence of the Kondo effect on the static magnetic susceptibility and electron spin resonance (ESR) parameters is studied in a simple molecular field approximation together with a scaling perturbative approach. Theoretical expressions well agree with the ESR and static magnetic susceptibility experimental data. [ABSTRACT FROM AUTHOR]

:Copyright of Magnetic Resonance in Solids is the property of Magnetic Resonance in Solids, Electronic Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Academic Journal

Size-dependent concentration of N0 paramagnetic centres in HPHT nanodiamonds.

Authors:Yavkin, B. V.1 boris.yavkin@gmail.com, Mamin, G. V.1, Gafurov, M. R.1, Orlinskii, S. B.1

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 1, p1-7. 7p.

Subject Terms:*NANODIAMONDS, *HIGH pressure (Science), *HIGH temperature chemistry, *ELECTRON paramagnetic resonance spectroscopy, *PARAMAGNETIC materials

Abstract:Size-calibrated commercial nanodiamonds synthesized by high-pressure high-temperature (HPHT) technique were studied by high-frequency W- and conventional X-band electron paramagnetic resonance (EPR) spectroscopy. The numbers of spins in the studied samples were estimated. The coreshell model of the HPHT nanodiamonds was proposed to explain the observed dependence of the concentration of the N0 paramagnetic centers. Two other observed paramagnetic centers are attributed to the two types of structures in the nanodiamond shell. [ABSTRACT FROM AUTHOR]

:Copyright of Magnetic Resonance in Solids is the property of Magnetic Resonance in Solids, Electronic Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Academic Journal

Size-dependent concentration of N0 paramagnetic centres in HPHT nanodiamonds

Authors:B.V. Yavkin, G.V. Mamin, M.R. Gafurov, S.B. Orlinskii

Source:Magnetic Resonance in Solids, Vol 17, Iss 1, p 15101 (2015)

Subject Terms:diamond, nanodaimond, EPR, ESR, crystal defect, Electricity and magnetism, Physics, Science

More Info:Size-calibrated commercial nanodiamonds synthesized by high-pressure high-temperature (HPHT) technique were studied by high-frequency W- and conventional X-band electron paramagnetic resonance (EPR) spectroscopy. The numbers of spins in the studied samples were estimated. The core-shell model of the HPHT nanodiamonds was proposed to explain the observed dependence of the concentration of the N0 paramagnetic centers. Two other observed paramagnetic centers are attributed to the two types of structures in the nanodiamond shell.

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Relation:http://mrsej.kpfu.ru/contents/2015/MRSej_15101.pdf; https://doaj.org/toc/2072-5981

Access URL:https://doaj.org/article/3ddd81eb80cb4eec9377bbf9de1ca282

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Academic Journal

Magnetic properties and spin kinetics in Kondo lattices

Authors:S.I. Belov, A.S. Kutuzov

Source:Magnetic Resonance in Solids, Vol 17, Iss 1, p 15104 (2015)

Subject Terms:Kondo lattice, Kondo effect, ESR, static magnetic susceptibility, Electricity and magnetism, Physics, Science

More Info:We present a theoretical model to describe unusual properties of Kondo lattices. The influence of the Kondo effect on the static magnetic susceptibility and electron spin resonance (ESR) parameters is studied in a simple molecular field approximation together with a scaling perturbative approach. Theoretical expressions well agree with the ESR and static magnetic susceptibility experimental data.

File Description:electronic resource

Relation:http://mrsej.kpfu.ru/contents/2015/MRSej_15104.pdf; https://doaj.org/toc/2072-5981

Access URL:https://doaj.org/article/6fb5599c80004466a1ecd054a18183a1

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