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    Morphology and magnetic properties of iron sulphides nanoparticles synthesized by the thermal decomposition method with different surfactants / R. D. IvantsovChun-Rong Lin, Yu. V. Knyazev [et al.] // Новое в магнетизме и магнитных материалах : сборник трудов XXIV международной конференции / прогр. ком.: Р. С. Исхаков, С. Г. Овчинников [и др.]. - 2021. - Секция 11 : Магнитные наноструктуры. - Ст. 11-25-28. - Библиогр.: 4
   Перевод заглавия: Морфология и магнитные свойства наночастицы сульфидов железа, синтезированных методом термического разложения с различными сурфактантами
Аннотация: Morphology, magnetic, and structural properties were investigated of the iron sulphides (FexSy) nanoparticles fabricated by the thermal decomposition method using oleylamine, 1-hexadecylamine and octadecylamine surfactants. The presence of surfactant layer is confirmed by FT-IR spectroscopy and thermo-gravimetric analysis. The structural analysis and Mцssbauer spectroscopy of synthesized nanoparticles showed in main Fe3S4 phase with inclusions of Fe9S11 in cases of OLA and HDA surfactants and significant admixture of FeS2 and even Fe2O3 in case of ODA surfactant. Deviations of iron ions distribution among crystal positions from that in bulk pure greigite and the pronounce changes in the magnetic circular dichroism (MCD) spectra are explained with the influence of surfactants on the particles formation process as well with the role of the boundary between magnetic core and organic shell.

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Доп.точки доступа:
Исхаков, Рауф Садыкович \прогр. ком.\; Iskhakov, R. S.; Овчинников, Сергей Геннадьевич \прогр. ком.\; Ovchinnikov, S. G.; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Chun-Rong Lin; Knyazev, Yu. V.; Князев, Юрий Владимирович; Ying Zhen Chen; Zharkov, S. M.; Жарков, Сергей Михайлович; Lin, E. S.; Chen, B.Y.; Yaw-Teng Tseng; Edelman, I. S.; Эдельман, Ирина Самсоновна; "Новое в магнетизме и магнитных материалах", международная конференция(24 ; 2021 ; 1-8 июля ; Москва); Научный совет по физике конденсированных сред РАН; МИРЭА - Российский технологический университет; Московский государственный университет им. М.В. Ломоносова; Магнитное общество России
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Наночастицы оксидов железа для выделения ДНК из клеток крови / А. В. Тюменцева, А. С. Горбенко, Р. Н. Ярославцев [и др.] // Изв. РАН. Сер. физич. - 2021. - Т. 85, № 9. - С. 1257-1262, DOI 10.31857/S0367676521090180. - Библиогр.: 13. - Исследование выполнено при финансовой поддержке Российского фонда фундаментальных исследований, Правительства Красноярского края, Красноярского краевого фонда поддержки научной и научно-технической деятельности (проект № 20-42-242902). Работа поддержана Советом по грантам Президента Российской Федерации для государственной поддержки молодых российских ученых - кандидатов наук (прект № МК-1263.2020.3) . - ISSN 0367-6765
Аннотация: Получены магнитные наночастицы с силикатным покрытием, изучены их физико-химические свойства. Экспериментально подтверждена возможность использования полученных нанокомпозитов для выделения ДНК из лейкоцитов для генетических исследований.

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Переводная версия Iron oxide nanoparticles for isolating DNA from blood cells [Текст] / A. V. Tyumentseva, A. S. Gorbenko, R. N. Yaroslavtsev [et al.] // Bull. Russ. Acad. Sci. Phys. - 2021. - Vol. 85 Is. 9.- P.965-969

Держатели документа:
Федеральное государственное бюджетное научное учреждение Федеральный исследовательский центр “Красноярский научный центр Сибирского отделения Российской академии наук”, Красноярск, Россия
Красноярский филиал Федерального государственного бюджетного учреждения “Гематологический научный центр” Министерства здравоохранения и социального развития Российской Федерации, Красноярск, Россия
Институт физики имени. Л.В. Киренского Сибирского отделения Российской академии наук – обособленное подразделение Федерального государственного бюджетного научного учреждения Федеральный исследовательский центр “Красноярский научный центр Сибирского отделения Российской академии наук”, Красноярск, Россия
Федеральное государственное автономное образовательное учреждение высшего образования “Сибирский федеральный университет”, Красноярск, Россия

Доп.точки доступа:
Тюменцева, А. В.; Горбенко, А. С.; Ярославцев, Роман Николаевич; Yaroslavtsev, R. N.; Столяр, Сергей Викторович; Stolyar, S. V.; Герасимова, Юлия Валентиновна; Gerasimova Yu. V.; Комогорцев, Сергей Викторович; Komogortsev, S. V.; Баюков, Олег Артемьевич; Bayukov, O. A.; Князев, Юрий Владимирович; Knyazev, Yu. V.; Волочаев, Михаил Николаевич; Volochaev, M. N.; Ольховский, И. А.; Исхаков, Рауф Садыкович; Iskhakov, R. S.
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57Fe Mössbauer spectroscopy of FexMn1–xS at low temperature / G. M. Abramova, O. A. Bayukov, Yu. V. Knyazev, S. P. Kubrin // 3-я Всероссийская научная конференция «Методы исследования состава и структуры функциональных материалов» (МИССФМ-2020) : 1-4 сент. 2020, Новосибирск : сб. тез. докл. - Новосибирск, 2020. - Ст. СД-16. - P. 309-310. - Библиогр.: 3. - This work was supported by the Russian Science Founation (project no. 17-12-01111) . - ISBN 978-5-906376-29-9

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Доп.точки доступа:
Abramova, G. M.; Абрамова, Галина Михайловна; Bayukov, O. A.; Баюков, Олег Артемьевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Kubrin, S. P.; Российская академия наук; Сибирское отделение РАН; Институт катализа им. Г.К. Борескова Сибирского отделения РАН; Новосибирский государственный университет; Институт ядерной физики им. Г.И. Будкера Сибирского отделения РАН; Новосибирский институт органической химии им. Н. Н. Ворожцова СО РАН; Институт неорганической химии им. А.В. Николаева Сибирского отделения РАН"Методы исследования состава и структуры функциональных материалов", Всероссийская научная конференция(3 ; 2020 ; сент. ; Новосибирск)
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Temperature- and field-induced magnetic transitions in the cobalt-containing borates / N. V. Kazak, N. A. Bel’skaya, Yu. V. Knyazev [et al.] // International conference "Functional materials" : book of abstracts / ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2021. - P. 31. - Библиогр.: 5 назв. - This work has been financed by the Russian Foundation for Basic Research (project no.20-02-00559).

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Доп.точки доступа:
Berzhansky, V. N. \ed.\; Бержанский, Владимир Наумович; Ovchinnikov, S. G. \org. com.\; Овчинников, Сергей Геннадьевич; Kazak, N. V.; Казак, Наталья Валерьевна; Bel’skaya, N. A.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Yumashev, V. V.; Gavrilkin, S. Yu.; Ovchinnikov, S. G.; "Functional materials", International conference(2021 ; Oct. 4-8 ; Alushta, Russia); Крымский федеральный университет имени В.И. Вернадского
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    Giant anisotropy of magnetic properties of hydrated iron fluoridotitanate single crystal / A. A. Dubrovskiy, Y. V. Knyazev, D. A. Velikanov [et al.] // J. Alloys Compd. - 2022. - Vol. 898. - Ст. 162748, DOI 10.1016/j.jallcom.2021.162748. - Cited References: 53. - The reported study was funded by Russian Foundation for Basic Research , Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project "Spectral and magnetic properties of single crystals of transition metal fluoride hexahydrates.” No. 20-42-240014 . - ISSN 0925-8388
   Перевод заглавия: Гигантская анизотропия магнитных свойств гидратированных ионов монокристалла флюоридотитаната
Аннотация: Study of the magnetic properties of the FeTiF6 ‧ 6 H2O single crystal has shown that this compound is a two-dimensional antiferromagnet with a Néеl temperature of TN = 8 K and its magnetic moment anisotropy attains 7000% at a temperature of T = 4.2 K. The Mössbauer spectroscopy data unambiguously indicate the paramagnetic state of iron cations in the temperature range of 4.2–300 K. However, a sharp change in the difference between the quadrupole doublet linewidths at 10 K has been observed, which is consistent with the temperature of magnetic ordering. It has been suggested that the long-range magnetic order is established in the crystal through the formation of the exchange coupling revealed by the electron spin resonance measurements on the oriented single crystals.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660079, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Laptash, N. M.; Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна
}
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Interparticle magnetic interactions in synthetic ferrihydrite: Mossbauer spectroscopy and magnetometry study of the dynamic and static manifestations / Y. V. Knyazev, D. A. Balaev, S. V. Stolyar [et al.] // J. Alloys Compd. - 2022. - Vol. 889. - Ст. 161623, DOI 10.1016/j.jallcom.2021.161623. - Cited References: 84. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 19–42–240012 R-A “Magnetic Resonance in Ferrihydrite Nanoparticles: Effects Related to the Core-Shell Structure” . - ISSN 0925-8388
Кл.слова (ненормированные):
Ferrihydrite nanoparticles -- Superparamagnetism -- Interparticle magnetic interactions
Аннотация: Samples of synthetic ferrihydrite with an average nanoparticle size of 2.7 nm have been examined by magnetometry and Mossbauer spectroscopy. Ferrihydrite is characterized by the antiferromagnetic interactions between the magnetic moments of iron atoms. In ferrihydrite nanoparticles, as in any other antiferromagnetic ones, structural defects induce the formation of an uncompensated magnetic moment, which determines the magnetic properties typical of single-domain ferro- and ferrimagnetic particles. The manifestation of the magnetic interactions between ferrihydrite nanoparticles in the magnetic properties of the material and in the temperature evolution of Mossbauer spectra has been in focus. The results obtained on synthetic ferrihydrite have been compared with the data for the biogenic ferrihydrite sample with a similar average size of particles surrounded by a polysaccharide shell, which weakens and screens the interparticle magnetic interactions. A clear manifestation of the effect of the interparticle magnetic interactions on the transition to the blocked state is the presence of a significant contribution of the relaxation component in the Mossbauer spectra at temperatures of the transition from the superparamagnetic to blocked state. The temperature dependence of the particle relaxation time obtained from the Mossbauer spectra points out the collective effect of freezing of the magnetic moments of particles due to the magnetic interactions between them.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodniy 79, Krasnoyarsk, 660041, Russian Federation
Krasnoyarsk Scientific Center, Federal Research Center KSC SB RAS, Akademgorodok 50, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Balaev, D. A.; Балаев, Дмитрий Александрович; Stolyar, S. V.; Столяр, Сергей Викторович; Krasikov, A. A.; Красиков, Александр Александрович; Bayukov, O. A.; Баюков, Олег Артемьевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Ladygina, V. P.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович
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Magnetic fractions of PM2.5, PM2.5-10, and PM10 from coal fly ash as environmental pollutants / E. V. Fomenko, N. N. Anshits, L. A. Solovyov [et al.] // ACS Omega. - 2021. - Vol. 6, Is. 30. - P. 20076-20085, DOI 10.1021/acsomega.1c03187. - Cited References: 59. - This work was conducted within the framework of the budget project # 121031500198-3 for Institute of Chemistry and Chemical Technology SB RAS using for SEM–EDS and magnetic studies the equipment of Krasnoyarsk Regional Research Equipment Centre of SB RAS . - ISSN 2470-1343
Аннотация: Characterization of magnetic particulate matter (PM) in coal fly ashes is critical to assessing the health risks associated with industrial coal combustion and for future applications of fine fractions that will minimize solid waste pollution. In this study, magnetic narrow fractions of fine ferrospheres related to environmentally hazardous PM2.5, PM2.5–10, and PM10 were for the first time separated from fly ash produced during combustion of Ekibastuz coal. It was determined that the average diameter of globules in narrow fractions is 1, 2, 3, and 7 μm. The major components of chemical composition are Fe2O3 (57–60) wt %, SiO2 (25–28 wt %), and Al2O3 (10–12 wt %). The phase composition is represented by crystalline phases, including ferrospinel, α-Fe2O3, ε-Fe2O3, mullite, and quartz, as well as the amorphous glass phase. Mössbauer spectroscopy and magnetic measurements confirmed the formation of nanoscale particles of ε-Fe2O3. Stabilization of the ε-Fe2O3 metastable phase, with quite ideal distribution of iron cations, occurs in the glass matrix due to the rapid cooling of fine globules during their formation from mineral components of coal.

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Держатели документа:
Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center, Krasnoyarsk Science Center SB RAS, Akademgorodok 50/24, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics SB RAS, Federal Research Center, Krasnoyarsk Science Center SB RAS, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Fomenko, E. V.; Anshits, N. N.; Solovyov, L. A.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Semenov, S. V.; Семёнов, Сергей Васильевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Anshits, A. G.
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Superparamagnetic effect on the dynamic remagnetization of CoFe2O4 nanoparticles in a pulse field / D. A. Balaev, I. S. Poperechny, A. A. Krasikov [et al.] // 4th International Baltic Conference on Magnetism (IBCM 2021) : Book of abstracts. - 2021. - P. 104. - Cited References: 7

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Kirensky Institute of Physics, Federal Research Center KSC SB RAS

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Poperechny, I. S.; Krasikov, A. A.; Красиков, Александр Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Popkov, S. I.; Попков, Сергей Иванович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Kirillov, V. L.; Yakushkin, S. S.; Martyanov, O.; Raikher, Y. L.; International Baltic Conference on Magnetism: focus on nanobiomedicine and smart materials(4 ; 2021 ; Aug. 29-Sept. 2 ; Svetlogorsk, Russia); Балтийский федеральный университет им. И. Канта
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Iron oxide nanoparticles for isolating DNA from blood cells / A. V. Tyumentseva, A. S. Gorbenko, R. N. Yaroslavtsev [et al.] // Bull. Russ. Acad. Sci. Phys. - 2021. - Vol. 85, Is. 9. - P. 965-969, DOI 10.3103/S1062873821090185. - Cited References: 13. - This work was supported by the Russian Foundation for Basic Research; the Government of Krasnoyarsk Territory; the Krasnoyarsk Regional Fund for the Support of Scientific and Scientific and Technical Activities, project no. 20-42-242902; and the RF Presidential Council of Grants for the State Support of Young Russian Scientists (Candidates of Science), project no. MK-1263.2020.3 . - ISSN 1062-8738
Кл.слова (ненормированные):
Blood -- Cells -- Cytology -- Iron oxides -- Metal nanoparticles -- Nanomagnetics -- Silicates -- Synthesis (chemical) -- Blood cells -- Cell-be -- Cell/B.E -- Cell/BE -- Leucocytes -- Magnetic iron-oxide nanoparticles -- Physical and chemical properties -- Silicate coatings -- Synthesised -- DNA
Аннотация: Magnetic iron oxide nanoparticles for separating DNA from blood cells are synthesized. Magnetic nanoparticles with a silicate coating are obtained, and their physical and chemical properties are studied. The possibility of using the nanocomposites to isolate DNA from leukocytes for hematological studies is confirmed experimentally.

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Публикация на русском языке Наночастицы оксидов железа для выделения ДНК из клеток крови [Текст] / А. В. Тюменцева, А. С. Горбенко, Р. Н. Ярославцев [и др.] // Изв. РАН. Сер. физич. - 2021. - Т. 85 № 9. - С. 1257-1262

Держатели документа:
Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Hematological Scientific Center, RF Ministry of Health and Social Development, Krasnoyarsk Branch, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Tyumentseva, A. V.; Gorbenko, A. S.; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Stolyar, S. V.; Столяр, Сергей Викторович; Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Bayukov, O. A.; Баюков, Олег Артемьевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Volochaev, M. N.; Волочаев, Михаил Николаевич; Olkhovskiy, I. A.; Iskhakov, R. S.; Исхаков, Рауф Садыкович
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10.

Effect of electron delocalization on the “recoil-free” absorption of γ-quants in Fe1.75V0.25BO4 warwickite / Yu. V. Knyazev, O. A. Bayukov, M. S. Shustin [et al.] // 4th International Baltic Conference on Magnetism (IBCM 2021) : Book of abstracts. - 2021. - P. 139. - Cited References: 2

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Bayukov, O. A.; Баюков, Олег Артемьевич; Shustin, M. S.; Шустин, Максим Сергеевич; Balatskii, D. V.; Bel’skaya, N. A.; Gromilov, S. A.; Sukhikh, A. S.; Rudenko, V. V.; Руденко, Валерий Васильевич; Kazak, N. V.; Казак, Наталья Валерьевна; International Baltic Conference on Magnetism: focus on nanobiomedicine and smart materials(4 ; 2021 ; Aug. 29-Sept. 2 ; Svetlogorsk, Russia); Балтийский федеральный университет им. И. Канта
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11.

Desulfovibrio desulfuricans AY5 isolated from a patient with autism spectrum disorder binds iron in low-soluble greigite and pyrite / O. V. Karnachuk, O. P. Ikkert, M. R. Avakyan [et al.] // Microorganisms. - 2021. - Vol. 9, Is. 12. - Ст. 2558, DOI 10.3390/microorganisms9122558. - Cited References: 43. - This research was partly supported by the Russian Foundation for Basic Research (project # 20-34-70051 to O.P.I.) . - ISSN 2076-2607
Кл.слова (ненормированные):
autism spectrum disorders -- biomineralisation -- Desulfovibrio desulfuricans -- pyrite -- greigite -- nitrogenase -- urease
Аннотация: The sulphate-reducing bacteria (SRB) of genus Desulfovibrio are a group of prokaryotes associated with autism spectrum disorders (ASD). The connection between the elevated numbers of Desulfovibrio in the gut of children with ASD compared with healthy children remains unresolved. A conceivable consequence of SRB overgrowth in the gut is the conversion of bioavailable iron into low-soluble crystalline iron sulphides, causing iron deficiency in the organism. In this study, we report the draft genome sequence and physiological features of the first cultivable isolate from a patient with ASD, Desulfovibrio desulfuricans strain AY5.The capability of the strain to produce crystalline iron sulphides was studied under different pH conditions. The most notable greigite(Fe3S4) and pyrite (FeS2) formation was revealed at pH 6.0, which suggests that the iron loss due to insoluble sulphide formation may occur in the proximal part of the gastrointestinal tract. Strain AY5 was adapted to grow under nitrogen-limiting conditions by N2 fixation. The urease found in the strain’s genome may play a role in resistance to acidic pH.

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Laboratory of Biochemistry and Molecular Biology, Tomsk State University, Tomsk, 634050, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences, Moscow, 119071, Russian Federation

Доп.точки доступа:
Karnachuk, O. V.; Ikkert, O. P.; Avakyan, M. R.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Volochaev, M. N.; Волочаев, Михаил Николаевич; Zyusman, V. S.; Panov, V. L.; Kadnikov, V. V.; Mardanov, A. V.; Ravin, N. V.
}
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12.

Conductivity study of Co3O2BO3 and Co 3-xFexO2BO3 oxyborates / N. V. Kazak [et al.] // Solid State Phenomena. - 2009. - Vol. 152-153. - P104-107, DOI 10.4028/www.scientific.net/SSP.152-153.104 . - ISSN 1012-0394
Кл.слова (ненормированные):
Doped cobaltite -- Electrical conductivity -- Ludwigite -- Variable-range hopping -- Crystal structure -- Electric conductivity -- Magnetic materials -- Single crystals -- Crystal structure -- Electric conductivity -- Magnetic materials -- Magnetism -- Single crystals -- Electrical conductivity -- Electrical resistivity -- Experimental data -- Mott variable-range hopping -- Oxyborates -- Temperature regions -- Variable-range hopping -- Doped cobaltite -- Ludwigite -- Variable range hopping -- Cobalt -- Cobalt
Аннотация: Single crystals of cobalt oxyborates Co3O2BO 3 and Co3-xFexO2BO3 were synthesized. The crystal structure and electric properties were investigated. The difference in the electrical resistivity behaviors was found. For parent Co3O2BO3 nor simple activation law, nor Mott variable range hopping (VRH) are acquirable to describe the experimental data in wide temperature region. In contrast for Co3-xFex O 2BO3 Mott's variable-range hopping conductivity clearly dominates.

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Держатели документа:
L.V. Kirensky Institute of Physics, SB of RAS, 660036, Akademgorodok, Krasnoyarsk, Russian Federation
Politechnical Institute, Siberian Federal University, Kirensky str. 26, 660074 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Ivanova, N. B.; Иванова, Наталья Борисовна; Rudenko, V. V.; Руденко, Валерий Васильевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Vasil'Ev, A. D.; Васильев, Александр Дмитриевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Moscow International Symposium on Magnetism(4 ; 2008 ; Jun. ; Moscow)
}
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13.

Maghemite nanoparticles for DNA extraction: Performance and blocking temperature / S. V. Stolyar, S. V. Komogortsev, A. S. Gorbenko [et al.] // J. Supercond. Novel Magn. - 2022. - Vol. 35, Is. 7. - P. 1929-1936, DOI 10.1007/s10948-022-06233-5. - Cited References: 33. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund, with research projects no. 20–42-242902. We are grateful to the Center of Collective Use of FRC KSC SB RAS for the provided equipment . - ISSN 1557-1939
Кл.слова (ненормированные):
Magnetic nanoparticles -- Superparamagnetism -- Blocking temperature -- Magnetic separation
Аннотация: Iron oxide nanoparticles coated with polyethylene glycol were synthesized by coprecipitation for use in the magnetic separation of DNA (deoxyribonucleic acid). The blocking temperature of nanoparticles was studied by the methods of Mossbauer spectroscopy, ferromagnetic resonance, and using magnetometric measurements. The blocking temperature calculated from the temperature dependence of the coercive force was ~ 200 K. The calculation of the blocking temperature from the relaxation time obtained using Mossbauer spectroscopy gave a value of ~ 450 K. The blocking temperature obtained using ferromagnetic resonance was ~ 910 K. The relationship between the obtained blocking temperatures is in good agreement with the Neel-Brown formula. The constants of effective and surface anisotropy were determined by the method of ferromagnetic resonance. Isolation of DNA from blood using prepared particles and separation in a permanent magnet field revealed sufficient productivity, high speed, and the “chemical delicacy” of this approach.

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Держатели документа:
Krasnoyarsk Scientific Center, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Ural Federal University, Ekaterinburg, Russian Federation

Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Gorbenko, A. S.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Olkhovskiy, I. A.; Neznakhin, D. S.; Tyumentseva, A. V.; Bayukov, O. A.; Баюков, Олег Артемьевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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14.

Ferrihydrite nanoparticles produced by Klebsiella oxytoca: Structure and properties dependence on the cultivation time / S. V. Stolyar, O. A. Bayukov, D. A. Balaev [et al.] // Adv. Powder Technol. - 2022. - Vol. 33, Is. 8. - Ст. 103692, DOI 10.1016/j.apt.2022.103692. - Cited References: 59. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research projects No. 20-416-242907 . - ISSN 0921-8831
Кл.слова (ненормированные):
Ferrihydrite nanoparticles -- Structure -- Microbial synthesis -- Mössbauer spectroscopy -- Small-angle X-ray scattering
Аннотация: Ferrihydrite nanoparticles were synthesized using Klebsiella oxytoca microorganisms under various cultivation conditions. The cultivation of bacteria was carried out under various lighting conditions, and the duration of cultivation varied from 3 to 56 days. Biogenic ferrihydrite nanoparticles were studied by Mössbauer spectroscopy, magnetometry, and small-angle X-ray scattering. The process of formation of ferrihydrite nanoparticles and the states arising during the cultivation of microorganisms have been investigated. The results of Mössbauer spectroscopy showed that, depending on the time of cultivation, three different states of ferrihydrite can be realized. States differ both in the ratio of defective and non-defective positions, and the size of the particle. Experimental results indicate that ferrihydrite nanoparticles are a system of variable composition and pass through several structural (or morphological) states during the cultivation of microorganisms. A model of the structure of ferrihydrite nanoparticles is proposed, which consists in the presence of an antiferromagnetic dense core with a high Néel temperature and a friable shell with a significantly lower temperature of magnetic ordering.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Krasnoyarsk Scientific Center, Federal Research Center KSC SB RAS Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Joint Institute for Nuclear Research, Dubna, Russian Federation

Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Bayukov, O. A.; Баюков, Олег Артемьевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Ladygina, V. P.; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Balasoiu, M.; Kolenchukova, O. A.; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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15.

Superparamagnetic blocking and magnetic interactions in nanoferrihydrite adsorbed on biomineralized nanorod-shaped F3S4 crystallites / Y. V. Knyazev, O. P. Ikkert, S. V. Semenov [et al.] // J. Alloys Compd. - 2022. - Vol. 923. - Ст. 166346, DOI 10.1016/j.jallcom.2022.166346. - Cited References: 109. - This study was supported by the Russian Science Foundation, project no. 22-24-00601 (https://rscf.ru/project/22–24–00601/). - The electron microscopy and Mössbauer spectroscopy studies were carried out on the equipment of the Krasnoyarsk Territorial Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. We thank Dr. Ivan Nemtsev for the SEM images. The contribution of M. P. (development of methodology of sample preparation for EXAFS measurements) was partially supported by the Russian Ministry of Science and Higher Education via the budget project of SRF SKIF, Boreskov Institute of Catalysis . - ISSN 0925-8388
Кл.слова (ненормированные):
Biomineralization -- Superparamagnetic nanoparticles -- Interparticle interactions -- Iron sulfide -- Ferrihydrite
Аннотация: A composite based on nanorod-shaped greigite (Fe3S4) crystallites with adsorbed ferrihydrite (Fe2O3 ‧ nH2O) nanoparticles has been synthesized. The synthesis has been performed by biomineralization of the bacterial wall of a sulfate-reducing Desulfovibrio sp. A2 bacteria. The phase composition of the synthesized composite has been investigated by X-ray powder and electron diffraction, as well as Fourier-transform infrared, extended X-ray absorption fine structure, and Mössbauer spectroscopy. The magnetic measurement data have shown that the sample under study contains two magnetic phases: multidomain nanorod-shaped greigite and ultrasmall ferrihydrite nanoparticles. The constant atomic fraction of the greigite crystalline phase in the range of 4–300 K (~20%) revealed by Mössbauer spectroscopy is indicative of a blocked magnetic moment of nanorod-shaped Fe3S4. It is shown that nanorod-shaped Fe3S4 crystallites are strongly magnetically bound with adsorbed Fe2O3 ‧ nH2O (Eint ~ 1200kB) nanoparticles. This significantly slows down the superparamagnetic relaxation of the magnetic moments of ferrihydrite nanoparticles. Therefore, the blocking temperature noticeably increases and attains, according to the Mössbauer spectroscopy data, a value of TB = 140 K (the magnetic measurements yield TB = 72 K). The processes of superparamagnetic blocking of the magnetic moments of ferrihydrite nanoparticles manifest themselves in the evolution of the magnetic properties of the investigated sample (a significant increase in the coercivity and remanent magnetization). In support of the Mössbauer spectroscopy data, a sufficiently high superparamagnetic blocking temperature has been established, which discloses the effect of magnetizing of ferrihydrite nanoparticles by coarser greigite formations, analogously to the effect of interparticle magnetic interactions.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Plant Physiology, Biotechnology, and Bioinformatics, Tomsk State University, Tomsk, 634050, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Synchrotron radiation facility SKIF, Boreskov Institute of Catalysis SB RAS, Kol'tsovo, 630559, Russian Federation
National Research Center “Kurchatov Institute”, Moscow, 123182, Russian Federation

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Ikkert, O. P.; Semenov, S. V.; Семёнов, Сергей Васильевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Platunov, M. S.; Платунов, Михаил Сергеевич; Khramov, E. V.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shestakov, N. P.; Шестаков, Николай Петрович; Smorodina, E. D.; Karnachuk, O. V.; Balaev, D. A.; Балаев, Дмитрий Александрович
}
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16.

Tuning of the interparticle interactions in ultrafine ferrihydrite nanoparticles / Y. V. Knyazev, D. A. Balaev, R. N. Yaroslavtsev [et al.] // Adv. Nano Res. - 2022. - Vol. 12, Is. 6. - P. 605-616, DOI 10.12989/anr.2022.12.6.605. - Cited References: 73. - This study was supported by the Russian Science Foundation, project no. 21-72-00025 “Tuning the Magnetic Properties of Ultrafine Biocompatible Ferrihydrite Nanoparticles through Interparticle Interactions” (https://rscf.ru/project/21-72-00025/) . - ISSN 2287-237X
Кл.слова (ненормированные):
ferrihydrite ultrafine nanoparticles -- hyperfine structure -- interparticle interactions -- iron oxyhydroxide -- superparamagnetic relaxation -- surface coatings
Аннотация: We prepared two samples of ultrafine ferrihydrite (FH) nanoparticle ensembles of quite a different origin. First is the biosynthesized sample (as a product of the vital activity of bacteria Klebsiella oxytoca (hereinafter marked as FH-bact) with a natural organic coating and negligible magnetic interparticle interactions. And the second one is the chemically synthesized ferrihydrite (hereinafter FH-chem) without any coating and high level of the interparticle interactions. The interparticle magnetic interactions have been tuned by modifying the nanoparticle surface in both samples. The coating of the FH-bact sample has been partially removed by annealing at 150℃ for 24 h (hereinafter FH-annealed). The FH-chem sample, vice versa, has been coated (1.0 g) with biocompatible polysaccharide (arabinogalactan) in an ultrasonic bath for 10 min (hereinafter FH-coated). The changes in the surface properties of nanoparticles have been controlled by XPS. According to the electron microscopy data, the modification of the nanoparticle surface does not drastically change the particle shape and size. A change in the average nanoparticle size in sample FH-annealed to 3.3 nm relative to the value in the other samples (2.6 nm) has only been observed. The estimated particle coating thickness is about 0.2-0.3 nm for samples FH-bact and FH-coated and 0.1 nm for sample FH-annealed. Mössbauer and magnetization measurements are definitely shown that the drastic change in the blocking temperature is caused by the interparticle interactions. The experimental temperature dependences of the hyperfine field hf>(T) for samples FH-bact and FH-coated have not revealed the effect of interparticle interactions. Otherwise, the interparticle interaction energy Eint estimated from the hf>(T) for samples FH-chem and FH-annealed has been found to be 121kB and 259kB, respectively.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Balaev, D. A.; Балаев, Дмитрий Александрович; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Krasikov, A. A.; Красиков, Александр Александрович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Mikhlin, Y. L.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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17.

    The superexchange interactions in mixed Co-Fe ludwigite / N. V. Kazak [et al.] // J. Magn. Magn. Mater. - 2011. - Vol. 323, Is. 5. - P. 521-527, DOI 10.1016/j.jmmm.2010.09.057. - Cited Reference Count: 15. - Гранты: This study was supported by the Russian Foundation for Basic Research (Project no. 09-02-00171-a), the Federal Agency for Science and Innovation (Rosnauka) (Project no. MK-5632. 2010.2), Physical Division of the Russian Academy of Science, the program "Strongly Correlated Electrons", project 2.3.1.; The financial support of Spanish MINCYT, MAT08/1077 and Aragonese E-34 project are also acknowledged. - Финансирующая организация: Russian Foundation for Basic Research [09-02-00171-a]; Federal Agency for Science and Innovation (Rosnauka) [MK-5632. 2010.2]; Physical Division of the Russian Academy of Science; "Strongly Correlated Electrons" [2.3.1]; Spanish MINCYT [MAT08/1077]; Aragonese E-34 project . - MAR. - ISSN 0304-8853
Рубрики:
TRANSPORT-PROPERTIES
   SPECTRA
Кл.слова (ненормированные):
ludwigite structure -- magnetic susceptibility -- magnetic frustration -- mott conductivity -- ludwigite structure -- magnetic frustration -- magnetic susceptibility -- mott conductivity -- ac susceptibility -- cation distributions -- crystal data -- crystallographic sites -- electrical resistivity -- iron atoms -- low temperatures -- ludwigite structure -- magnetic behavior -- magnetic frustrations -- magnetic system -- magnetic transitions -- mossbauer -- mossbauer effects -- mott conductivity -- mott hopping -- superexchange energy -- superexchange interaction -- temperature regions -- trivalent iron -- variable range -- cobalt -- electric conductivity -- magnetic susceptibility -- magnetism -- mossbauer spectroscopy -- x ray diffraction -- crystal structure
Аннотация: The crystal structure, cation distribution and exchange interactions in the Co2.25Fe0.75O2BO3 ludwigite have been explored through X-ray diffraction, electrical resistivity, ac-susceptibility and Mossbauer effect measurements. The crystal data have shown that iron atoms occupy the most symmetric crystallographic sites Fe4 and Fe2. The complex magnetic behavior with two magnetic transitions near 70 and 115 K at low temperatures was found. The Mossbauer data have displayed the trivalent iron states only. The values of superexchange energies have been estimated for Co3O2BO3 and Co2.25Fe0.75O2BO3 yielding a significant role of frustrations in the ludwigite magnetic system. Variable range Mott hopping conductivity law was proved to be valid in the wide temperature region, pointing out a localized character of charge carriers rather than collective. (C) 2010 Elsevier B.V. All rights reserved.

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Держатели документа:
RAS, LV Kirensky Phys Inst, SB, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, Abd Dept Fis Mat Condensada, E-50009 Zaragoza, Spain
Univ Zaragoza, Area Medidas Fis, Serv Instrumentac Cient, E-50009 Zaragoza, Spain

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Bayukov, O. A.; Баюков, Олег Артемьевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Ivanova, N. B.; Иванова, Наталья Борисовна; Knyazev, Yu. V.; Князев, Юрий Владимирович; Bartolom, J.; Arauzo, A.
}
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18.

    Carbon double coated Fe3O4@C@C nanoparticles: Morphology features, magnetic properties, dye adsorption / C. R. Lin, O. S. Ivanova, I. S. Edelman [et al.] // Nanomaterials. - 2022. - Vol. 12, Is. 3. - Ст. 376, DOI 10.3390/nano12030376. - Cited References: 44. - The work was supported financially by the Russian Foundation for Basic Research, Grant No. 19-52-52002 and Ministry of Science and Technology of Taiwan, Grants MOST No. 108-2923-M-153-001-MY3 and No. 109-2112-M-153-003-. The support was obtained also from the Joint Scientific Center of the Siberian Federal University supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation, where the Transmission Electron Microscopy studies were carried out . - ISSN 2079-4991
   Перевод заглавия: Наночастицы Fe3O4@C@C с двойным углеродным покрытием: Морфологические особенности, магнитные свойства, адсорбция красителей

РУБ Chemistry, Multidisciplinary + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
SOLID-PHASE EXTRACTION
FE3O4 NANOPARTICLES
PROFILE REFINEMENT
Кл.слова (ненормированные):
core-shell Fe3O4@C nanoparticles -- core-shell Fe3O4@C@C nanoparticles -- magnetic properties -- dyes adsorption
Аннотация: This work is devoted to the study of magnetic Fe3O4 nanoparticles doubly coated with carbon. First, Fe3O4@C nanoparticles were synthesized by thermal decomposition. Then these synthesized nanoparticles, 20–30 nm in size were processed in a solution of glucose at 200 °C during 12 h, which led to an unexpected phenomenon – the nanoparticles self-assembled into large conglomerates of a regular shape of about 300 nm in size. The morphology and features of the magnetic properties of the obtained hybrid nanoparticles were characterized by transmission electron microscopy, differential thermo-gravimetric analysis, vibrating sample magnetometer, magnetic circular dichroism and Mössbauer spectroscopy. It was shown that the magnetic core of Fe3O4@C nanoparticles was nano-crystalline, corresponding to the Fe3O4 phase. The Fe3O4@C@C nanoparticles presumably contain Fe3O4 phase (80%) with admixture of maghemite (20%), the thickness of the carbon shell in the first case was of about 2–4 nm. The formation of very large nanoparticle conglomerates with a linear size up to 300 nm and of the same regular shape is a remarkable peculiarity of the Fe3O4@C@C nanoparticles. Adsorption of organic dyes from water by the studied nanoparticles was also studied. The best candidates for the removal of dyes were Fe3O4@C@C nanoparticles. The kinetic data showed that the adsorption processes were associated with the pseudo-second order mechanism for cationic dye methylene blue (MB) and anionic dye Congo red (CR). The equilibrium data were more consistent with the Langmuir isotherm and were perfectly described by the Langmuir–Freundlich model.

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Держатели документа:
Natl Pingtung Univ, Dept Appl Phys, Pingtung City 90003, Taiwan.
RAS, FRC KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
RAS, FRC KSC SB, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Lin, Chun-Rong; Ivanova, O. S.; Иванова, Оксана Станиславовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Knyazev, Yu. V.; Князев, Юрий Владимирович; Zharkov, S. M.; Жарков, Сергей Михайлович; Petrov, D. A.; Петров, Дмитрий Анатольевич; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Svetlitsky, E. S.; Светлицкий, Евгений Сергеевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Solovyov, Leonid A.; Chen, Ying-Zhen; Tseng, Yaw-Teng; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-52002]; Ministry of Science and Technology of TaiwanMinistry of Science and Technology, Taiwan [108-2923-M-153-001-MY3, 109-2112-M-153-003]; Joint Scientific Center of the Siberian Federal University [FSRZ-2020-0011]; Ministry of Science and Higher Education of the Russian Federation
}
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19.

Кристаллическая структура и магнитная анизотропия в людвигите Co2FeO2BO3 / Н. Б. Иванова [и др.] // Журнал экспериментальной и теоретической физики. - 2011. - Т. 140, № 6. - С. 1160-1172 . - ISSN 0044-4510
Рубрики:

Аннотация: Получены монокристаллы оксиборатов со структурой людвигита Co3FeO2BO3 и Co2FeO2BO3. Проведено детальное исследование кристаллической структуры и магнитных свойств. В замещенном людвигите Co2FeO2BO3 обнаружено двухэтапное магнитное упорядочение при температурах, характерных для Fe3O2BO3 (TN1 ? 110 К, TN2 = 70 К), а не для Co3FeO2BO3 (TN = 42 К). Данный эффект объяснен с позиций предпочтительного характера заполнения железом неэквивалентных кристаллографических позиций, как выявлено в ходе рентгеноструктурных исследований. Оба материала демонстрируют ярко выраженную одноосную магнитную анизотропию. Кристаллографическое направление Ь является легким направлением намагничивания. При замещении железом кобальтовый людвигит приобретает чрезвычайную магнитную жесткость.

РИНЦ
Держатели документа:
Institute de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza and Departamento de Fisica de la Materia Condensada
Институт физики им. Л. В. Киренского Сибирского отделения Российской академии наук
Красноярский государственный аграрный университет
Сибирская аэрокосмическая академия
Сибирский федеральный университет

Доп.точки доступа:
Иванова, Наталья Борисовна; Ivanova, N.B.; Патрин, Геннадий Семёнович; Patrin, G. S.; Казак, Наталья Валерьевна; Kazak, N. V.; Князев, Юрий Владимирович; Knyazev, Yu. V.; Великанов, Дмитрий Анатольевич; Velikanov, D. A.; Безматерных, Леонард Николаевич; Bezmaternykh, L. N.; Овчинников, Сергей Геннадьевич; Ovchinnikov, S. G.; Васильев, Александр Дмитриевич; Vasiliev, A. D.; Платунов, Михаил Сергеевич; Platunov, M. S.; Бартоломе, X.
}
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20.

    Synthesis and characterization of nanoscale composite particles formed by 2D layers of Cu-Fe sulfide and Mg-based hydroxide / Y. L. Mikhlin, R. V. Borisov, S. A. Vorobyev [et al.] // J. Mater. Chem. A. - 2022. - Vol. 10, Is. 17. - P. 9621-9634, DOI 10.1039/d2ta00877g. - Cited References: 84. - This research was supported by the Russian Foundation for Basic Research, Krasnoyarsk Territory Administration and Krasnoyarsk Territory Science Foundation, project 20-43-242903. Facilities of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” were employed in the work . - ISSN 2050-7488
   Перевод заглавия: Синтез и исследование наноразмерных композитных частиц, образованных двумерными слоями сульфида Cu-Fe и гидроксида на основе Mg
Кл.слова (ненормированные):
Binary alloys -- Copper compounds -- Electron energy levels -- Electron energy loss spectroscopy -- Electron scattering -- Light absorption -- Light scattering -- Magnesium compounds -- Near infrared spectroscopy -- Paramagnetism -- Sols -- Sulfur compounds -- X-ray photoelectron spectroscopy
Аннотация: We introduce here a multifunctional material composed of alternating atomic sulfide sheets close to the composition of CuFeS2 and Mg-based hydroxide ones (valleriite), which are assembled due to their electric charges of opposite sign. Valleriite particles 50-200 nm in lateral size and 10-20 nm in thickness were synthesized via a simple hydrothermal pathway using various concentrations of precursors and dopants, and examined with XRD, TEM, EDS, X-ray photoelectron spectroscopy, reflection electron energy loss spectroscopy (REELS), Mossbauer, Raman and UV-vis-NIR spectroscopies, and magnetization, dynamic light scattering, and zeta potential measurements. The electronic, magnetic and optical characteristics are found to be critically dependent on the charge (electron density) at the narrow-gap sulfide layers containing Cu+ and Fe3+ cations, and can be tuned via the composition of the hydroxide part. Particularly, substitution of Mg2+ with Al3+ increases the negative charge of the hydroxide layers and reduces the content of Fe3+-OH centers (10-45% of total iron); the effects of Cr and Co dopants entering both layers are more complicated. Mossbauer doublets of paramagnetic Fe3+ detected at room temperature transform into several Zeeman sextets at 4.2 K; the hyperfine fields up to 500 kOe and complex magnetic behavior, but not pure paramagnetism or antiferromagnetism, were observed for valleriites with the higher positive charge of the sulfide sheets, probably due to the depopulation of the minority-spin 3d states of S-bonded Fe3+ ions. Aqueous colloids of valleriite show optical absorption at 500-750 nm, which, along with the peaks at the same energies in REELS, may arise due to quasi-static dielectric resonance involving the vacant Fe 3d band and being dependent on the composition of both layers too. These and other findings call attention to valleriites as a new rich family of 2D materials for a variety of potential applications.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of sciences, Akademgorodok, 50/24, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of sciences, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodny av. 79, Krasnoyarsk, 660041, Russian Federation
Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of sciences”, Akademgorodok, 50, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Mikhlin, Y. L.; Borisov, R. V.; Vorobyev, S. A.; Tomashevich, Y. V.; Romanchenko, A. S.; Likhatski, M. N.; Karacharov, A. A.; Bayukov, O. A.; Баюков, Олег Артемьевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Nemtsev, I. V.; Немцев, Иван Васильевич
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