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Resonance absorptions in KFe11O17 / V. N. Vvasilev [и др.] // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 10. - P. 3047-3051. - Cited References: 11 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
MAGNETIC-PROPERTIES

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Держатели документа:
LV KIRENSKII INST PHYS,KRASNOYARSK,RUSSIA
ИФ СО РАН

Доп.точки доступа:
Vvasilev, V. N.; Matveiko, E. N.; Kruglik, A. I.; Круглик, Анатолий Иванович; Pankrats, A. I.; Панкрац, Анатолий Иванович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Sablina, K. A.; Саблина, Клара Александровна
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APLESNIN, S. S.
FORMATION OF FERROMAGNETIC ORDER IN ANISOTROPIC FRUSTRATED ANTIFERROMAGNETS / S. S. APLESNIN // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 2. - P. 554-560. - Cited References: 5 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
COMPETING INTERACTIONS
MAGNETIC-PROPERTIES

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Specific features of spin, charge, and orbital ordering in cobaltites / N. B. Ivanova [et al.] // Phys. Usp. - 2009. - Vol. 52, Is. 8. - P. 789-810, DOI 10.3367/UFNe.0179.200908b.0837. - Cited References: 278. - This work was financially supported by the RFBR (projects 09-02-00171-a, 07-02-00226, and 09-02-00127), the Federal Agency of Science and Innovation (grant MK-4278.2008.2), and the Presidium of the Russian Academy of Sciences Program No. 5, Quantum Physics of Condensed Media (project No. 7). I.M.E.'s work was supported by the program for Leading Science Schools of the Ministry of Education and Science of the Russian Federation (grant 2.1.1/3199). . - ISSN 1063-7869

РУБ Physics, Multidisciplinary
Рубрики:
PEROVSKITE-TYPE OXIDES
   METAL-INSULATOR-TRANSITION
   HIGH-TEMPERATURE SUPERCONDUCTIVITY
   ONE-DIMENSIONAL CA3CO2O6
   ELECTRONIC-STRUCTURE
   MAGNETIC-PROPERTIES
   TRANSPORT-PROPERTIES
   STATE TRANSITION
   FUEL-CELLS
   CRYSTAL-STRUCTURE
Кл.слова (ненормированные):
Cobalt oxides -- Lanthanides -- Orbital degrees of freedom -- Orbital ordering -- Quasi-one-dimensional -- Spin state -- Superconducting compounds -- Theoretical result -- Calcium -- Cobalt -- Lanthanum -- Oxide minerals -- Perovskite -- Spin dynamics -- Superconductivity -- Cobalt compounds
Аннотация: Complex cobalt oxides known as cobaltites are reviewed, including LnCoO(3)-based perovskite-structured rare-earth cobaltites (where Ln is lanthanum or a lanthanide), quasi-two-dimensional and quasi-one-dimensional cobaltites of the types LnCo(2)O(5+delta), La2CoO4, and Ca3Co2O8, and NaxCoO2 center dot yH(2)O superconducting compounds. Key experimental and theoretical results are presented, with emphasis on the interplay between charge, spin, and orbital degrees of freedom. Two problems of specific relevance to cobaltites - the spin state instability of Co3+ ions in LnCoO(3), and the nature of superconductivity in NaxCoO2 center dot yH(2)O - are also given significant attention.

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Держатели документа:
[Ivanova, N. B.
Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660074, Russia
[Ovchinnikov, S. G.
Korshunov, M. M.
Kazak, N. V.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Korshunov, M. M.
Eremin, I. M.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Eremin, I. M.] Kazan VI Lenin State Univ, Kazan 420008, Russia
ИФ СО РАН
Siberian Federal University, ul. Kirenskogo 26, 660074 Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50-38, 660036 Krasnoyarsk, Russian Federation
Max-Planck-Institut FuE R Physik Komplexer Systeme, NoE thnitzer Straue 38, D-01187 Dresden, Germany
Kazan State University, ul. Kremlevskaya 18, 420008 Kazan, Russian Federation

Доп.точки доступа:
Ivanova, N. B.; Иванова, Наталья Борисовна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Eremin, I. M.; Kazak, N. V.; Казак, Наталья Валерьевна; RFBR [09-02-00171-a, 07-02-00226, 09-02-00127]; Federal Agency of Science and Innovation [MK-4278.2008.2]; Presidium of the Russian Academy of Sciences [5, 7]; Leading Science Schools of the Ministry of Education and Science of the Russian Federation [2.1.1/3199]
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Observation of spontaneous spin reorientation in Nd1-x Dy (x) Fe-3(BO3)(4) ferroborates with a competitive R-Fe exchange / Y. F. Popov [et al.] // JETP Letters. - 2009. - Vol. 89, Is. 7. - P. 345-351, DOI 10.1134/S002136400907008X. - Cited References: 14. - We are deeply grateful to A. K. Zvezdin and A. P. Pyatakov for useful advice and to E. A. Popova for placing the DyFeINF3/INF(BOINF3 /INF)INF4INF single crystal at our disposal. This work was supported by the Russian Foundation for Basic Research ( project no. 07-02-00580-a). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
TRIGONAL GDFE3(BO3)(4)
MAGNETIC-PROPERTIES
DYFE3(BO3)(4)
Аннотация: The magnetic, magnetoelectric, and magnetoelastic properties of DyFe3(BO3)(4) single crystals and the Nd0.75Dy0.25Fe3(BO3)(4) substituted compound with the competitive Nd-Fe and Dy-Fe exchange interactions have been investigated in magnetic fields up to 210 kOe. It has been shown that the antiferromagnetic state in Nd0.75Dy0.25Fe3(BO3)(4) below the N,el temperature is easy-plane and a spontaneous spin-reorientation transition to a uniaxial state occurs near 25 K. Anomalies are observed in various physical characteristics in a spin-flop transition induced by the magnetic field along the trigonal axis. The H-T phase diagrams are constructed; they are in good agreement with a simple model taking into account the anisotropy of the exchange splitting and g factors of the ground doublets of the Dy3+ and Nd3+ ions. The features of the magnetoelectric effect in various magnetic phases have been studied. Spontaneous electric polarization has been revealed in the region of the existence of an easy-plane antiferromagnetic state in the substituted compound. A qualitative theoretical justification of the possibility of the appearance of the spontaneous spin-reorientation transition in the Nd0.75Dy0.25Fe3(BO3)(4) substituted compound is given.

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Держатели документа:
[Popov, Yu. F.
Kadomtseva, A. M.
Vorob'ev, G. P.] Moscow MV Lomonosov State Univ, Moscow 119992, Russia
[Mukhin, A. A.
Ivanov, V. Yu.
Kuz'menko, A. M.
Prokhorov, A. S.] Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow 119991, Russia
[Bezmaternykh, L. N.
Temerov, V. L.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660038, Russia
ИФ СО РАН
Moscow State University, Moscow 119992, Russian Federation
Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow 119991, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660038, Russian Federation

Доп.точки доступа:
Popov, Y. F.; Kadomtseva, A. M.; Vorob'ev, G. P.; Mukhin, A. A.; Ivanov, V. Y.; Kuz'menko, A. M.; Prokhorov, A. S.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович; Russian Foundation for Basic Research [07-02-00580-a]
}
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    Catalytic properties and nature of active centers of ferrospheres in oxidative coupling of methane / A. G. Anshits [et al.] // Appl. Catal. A-Gen. - 2016. - Vol. 524. - P. 192-199, DOI 10.1016/j.apcata.2016.06.032. - Cited References:47. - This study was supported by the Russian Science Foundation (project no. 14-13-00289). . - ISSN 0926-860X. - ISSN 1873-3875
   Перевод заглавия: Каталитические свойства и природа активных центров ферросфер в оксидативной связи метана

РУБ Chemistry, Physical + Environmental Sciences
Рубрики:
GLASS CRYSTAL CATALYSTS
   MAGNETIC-PROPERTIES
   PROFILE REFINEMENT
   FLY-ASH
   MOSSBAUER
   MICROSPHERES
   PERFORMANCE
   CONVERSION
   ETHYLENE
   OXIDE
Кл.слова (ненормированные):
Methane coupling -- Active center -- Ferrospinel -- Mossbauer spectroscopy
Аннотация: Ferrospheres with the Fe2O3 content in the range from 76 to 97 wt% were applied as catalysts for the oxidative coupling of methane (OCM). To identify their phase composition and distribution of iron sites, the ferrospheres were characterized by X-ray powder diffraction and Mossbauer spectroscopy before and after the OCM reaction. Magnetite-based ferrite spinel, hematite and aluminosilicate glasses were established to be the main phases. The ferrospinel of all ferrospheres partially oxidized to hematite after the OCM reaction. It was established that the yield of C-2-hydrocarbons sharply increased at the ferrospheres with Fe2O3 content higher than 89 wt% The spinel phase of these ferrospheres includes Fevv3+(B) sites with a Ca2+ tetrahedral cation and an octahedral cation vacancy among the nearest neighbors. A linear correlation between the yield of C-2-hydrocarbons (ethane and ethylene) and the content of such sites was established, thus indicating that their electrophilic oxygen species participate in selective CH4 conversion to C2H6. (C) 2016 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Akad Gorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Akad Gorodok 50-38, Krasnoyarsk 660036, Russia.
Univ Rostock, Leibniz Inst Katalyse eV, Albert Einstein Str 29 a, D-18059 Rostock, Germany.

Доп.точки доступа:
Anshits, A. G.; Bayukov, O. A.; Баюков, Олег Артемьевич; Kondratenko, E. V.; Anshits, N. N.; Pletnev, O. N.; Плетнев, Олег Николаевич; Rabchevskii, E. V.; Solovyov, L. A.; Russian Science Foundation [14-13-00289]
}
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Study of mixed-valence Mn2BO4 using XRD, XPS and XAFS spectroscopies / N. V. Kazak [et al.] // Physica B. - 2019. - Vol. 560. - P. 228-235, DOI 10.1016/j.physb.2019.02.019. - Cited References: 39. - This work has been financed by Russian Foundation for Basic Research (17-02-00826 and 16-32-60049 grant numbers). . - ISSN 0921-4526. - ISSN 1873-2135

РУБ Physics, Condensed Matter
Рубрики:
SPIN-GLASS BEHAVIOR
MAGNETIC-PROPERTIES
PROFILE REFINEMENT
Кл.слова (ненормированные):
Charge-ordering -- Mixed-valence -- XAS -- XRD -- XPS
Аннотация: The valence states and local structure around Mn atoms in mixed-valence Mn2BO4 have been studied by temperature dependent X-ray powder diffraction (XRPD), X-ray photoelectron (XPS) and Mn K-edge X-ray absorption (XAFS) spectroscopies measurements. X-ray absorption near-edge structure (XANES) and XPS have been used to measure the average oxidation state of Mn in bulk and near-surface of the material. The edge position, peak shapes and pre-edge features of Mn K-edge XANES spectra have been discussed. The pronounced temperature dependence of the Debye-Waller (DW) factor corresponding to the MnO coordination shell has been found from the extended x-ray absorption fine structure (EXAFS) analysis and has been associated with variations in the local distortions in MnO6 octahedra and emergence of short-range magnetic correlations at low temperatures. The XRPD measurements have been carried out at 298, 523 and 773 K. The monoclinic symmetry (P21/n) was found to persist up to highest temperature measured. The BVS calculations have revealed large valence difference between two manganese sites that strongly supports the presence of charge ordering up to high temperatures.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Fed Res Ctr KSC SB RAS, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia.
Natl Res Ctr, Kurchatov Inst, Moscow 123182, Russia.

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Moshkina, E. M.; Мошкина, Евгения Михайловна; Solovyov, L. A.; Vereshchagin, S. N.; Mikhlin, Yu. L.; Veligzhanin, A. A.; Trigub, A. L.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research [17-02-00826, 16-32-60049]
}
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Growth of Textured Au-Fe/Fe Hybrid Nanocrystals on Oxidized Silicon Surface / I. A. Tarasov [et al.] // Semiconductors. - 2018. - Vol. 52, Is. 16. - P. 2073-2077, DOI 10.1134/S1063782618160364. - Cited References: 19. - The reported research was funded by Russian Foundation for Basic Research and the government of the region of the Russian Federation, grant no. 18-42-243013, the Program of the President of the Russian Federation for the support of young scientist (C Pi-2796.2018.1). We also thank L.A. Solovyov for his asistance in XRD analysis. . - ISSN 1063-7826. - ISSN 1090-6479

РУБ Physics, Condensed Matter
Рубрики:
INTERMETALLIC AU3FE1-X
MAGNETIC-PROPERTIES
FECU NANOPARTICLES
Аннотация: We present in this report the route to produce highly-textured Au3Fe(111)/Fe(110) hybrid nanocrystals on an amorphous surface of SiO2/Si by molecular beam epitaxy. By controlling the quantity of Au atoms deposited onto the SiO2/Si it is possible to tune the average lateral size of resultant Au-Fe hybrid nanocrystals from 10-20 nm up to 100-150 nm at the same Fe nominal thickness deposited. This process is sensitive to the initial density and size of Au islands. Examination of Au-Fe hybrid nanocrystals obtained was carried out using X-ray diffraction, transmission and scanning electron microscopy, reflection high energy electron diffraction, and Kerr effect methods.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Krasnoyarsk State Agr Univ, Achinsk Branch, Achinsk 662150, Russia.
Russian Acad Sci, Fed Res Ctr KSC, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Tarasov, I. A.; Тарасов, Иван Анатольевич; Smolyarova, T. E.; Смолярова, Татьяна Евгеньевна; Yakovlev, I. A.; Яковлев, Иван Александрович; Kosyrev, N. N.; Косырев, Николай Николаевич; Komarov, V. A.; Комаров, Василий Андреевич; Nemtsev, I. V.; Varnakov, S. N.; Варнаков, Сергей Николаевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research; government of the region of the Russian Federation [18-42-243013]; Russian Federation [CPi-2796.2018.1]; International Symposium "Nanostructures: Physics and Technology"(26th ; June 18-22, 2018 ; Minsk, Belarus)
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Magnetodielectric effect in a metamaterial consisting of xerogel with embedded ε-Fe2O3 iron oxide nanoparticles / A. A. Dubrovskiy [et al.] // Solid State Commun. - 2019. - Vol. 289. - P. 27-29, DOI 10.1016/j.ssc.2018.11.020. - Cited References: 30. - This work was supported by the Russian Science Foundation, project no. 17-12-01111. . - ISSN 0038-1098. - ISSN 1879-2766

РУБ Physics, Condensed Matter
Рубрики:
MAGNETIC-PROPERTIES
   HIGH-TEMPERATURE
   PHASE
   RAMAN
Аннотация: The ε-Fe2O3 iron oxide is a fairly rare polymorphic modification, which only exists in the form of nanoparticles embedded, as a rule, into a silica gel matrix. This magnetically ordered iron oxide, which exhibits a significant room-temperature coercivity, is a ferroelectric; therefore, the magnetoelectric and magnetodielectric properties of this material evoke keen interest. In this work, we investigate the magnetodielectric (MD) effect in a metamaterial consisting of xerogel SiO2 with embedded ε-Fe2O3 nanoparticles 9 nm in size on average in a concentration of 20 mass.%. This bulk material exhibits the MD effect in a wide temperature range. The temperature behavior of the permittivity is related to the magnetic state of the ε-Fe2O3 oxide, which undergoes the magnetic transition from the magnetically hard to magnetically soft phase in the temperature range of 80–150 K, indicating the interplay of the ε-Fe2O3 magnetic and charge subsystems.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Kiresnky Inst Phys, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Boreskov Inst Catalysis, Novosibirsk 630090, Russia.

Доп.точки доступа:
Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Balaev, D. A.; Балаев, Дмитрий Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Yakushhkin, S. S.; Kirillov, V. L.; Martyanov, O. N.; Russian Science Foundation [17-12-01111]
}
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    Structural and compositional specifications on biogenic ferrihydrite nanoparticles production by Klebsiella oxytoca / S. Kichanov [et al.] // Rom. Rep. Phys. - 2018. - Vol. 70, Is. 4. - Ст. 511. - Cited References: 17. - This work was supported by the Joint Institute for Nuclear Research Project No. 04-4-1121-2015/2017, and RO-JINR Projects Nos. 95/15.02.2016 and 96/15.02.2016, items 77, 82 and was funded by RFBR and Krasnoyarsk region according to the research project No 17-43-240527. Support by the Special Program for Siberian Federal University of the Ministry of Education and Science of the Russian Federation is acknowledged. . - ISSN 1221-1451. - ISSN 1841-8759
   Перевод заглавия: Особенности структуры и химического состава биогенных наночастиц ферригидрита полученных микроорганизмами Klebsiella oxytoca
Рубрики:
MAGNETIC-PROPERTIES
Кл.слова (ненормированные):
Biogenic ferrihydrite -- nanoparticles structure -- synchrotron radiation -- powder diffraction -- PIXE -- PIGE -- RBS
Аннотация: Investigations of biogenic ferrihydrite nanoparticles produced by bacteria Klebsiella oxytoca by applying methods of synchrotron radiation powder diffraction, particle-induced X-ray emission (PIXE), proton induced gamma-emission (PIGE) and proton Rutherford backscattering (RBS) are reported and discussed.

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Держатели документа:
Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Krasnoyarsk, Russia.
ELI NP, POB MG6, Bucharest, Romania.
Ovidius Univ, Fac Appl Sci & Engn, Constanta, Romania.
Moscow Tech Phys Inst, Dolgoprudnyi, Russia.

Доп.точки доступа:
Kichanov, S.; Pantelica, A.; Pantelica, D.; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Aranghel, D.; Ionescu, P.; Vladoiu, R.; Balasoiu, M.; Joint Institute for Nuclear Research Project [04-4-1121-2015/2017]; RO-JINR Projects [95/15.02.2016, 96/15.02.2016, 77, 82]; Krasnoyarsk region [17-43-240527]; Special Program for Siberian Federal University of the Ministry of Education and Science of the Russian Federation; RFBR
}
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10.

Superparamagnetic and ferrimagnetic nanoparticles in glass matrix / I. S. Edelman [et al.] // Physica B. - 2001. - Vol. 301, Is. 3-4. - P. 203-211, DOI 10.1016/S0921-4526(01)00274-5. - Cited References: 9 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:
MAGNETIC-PROPERTIES
PARTICLES
FILMS
Кл.слова (ненормированные):
magnetic nanoparticles -- Faraday rotation -- Faraday rotation -- Magnetic nanoparticles -- Crystal structure -- Faraday effect -- Ferrimagnetic materials -- Glass -- Particle size analysis -- Superparamagnetism -- X ray diffraction analysis -- Amorphous glass matrices -- Faraday rotations -- Nanostructured materials
Аннотация: Faraday rotation (FR) spectral, field, and temperature dependencies in oxide glasses with small additions of paramagnetic elements are investigated. Formation of ferrite nanoparticles in amorphous glass matrices is revealed by X-ray diffraction. Particles have crystal structure similar to spinel structure, their dimensions are about 10-24 nm. The FR field dependencies are typical for ferrimagnetic or superparamagnetic substances depending on particle size. Strong FR increase at the samples cooling (more than twice for some samples) in the temperature interval 105-273 K is observed. (C) 2001 Elsevier Science B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
SI Vavilov State Opt Inst, St Petersburg 193117, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Russian Academy of Sciences-SB, Krasnoyarsk 660036, Russian Federation
S.I. Vavilov Optical State Institute, St. Peterburg 193117, Russian Federation

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivantsov, R.; Vasiliev, A.; Stepanov, S.; Kornilova, E.; Zarubina, T.
}
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