Центральная Научная Библиотека УрО РАН

Вид документа : Статья из журнала
Шифр издания : 54/D 30
Автор(ы) : Naumovich E. N., Patrakeev M. V., Kharton V. V., Islam M. S., Yaremchenko A. A., Frade J. R., Marques F. M. B.
Заглавие : Defect interactions in La0.3Sr0.7Fe(M')O3-delta (M' = Al, Ga) perovskites: Atomistic simulations and analysis of p(O2)-T-delta diagrams
Параллельн. заглавия :Defect interactions in La0.3Sr0.7Fe(M')O3-delta (M' = Al, Ga) perovskites: Atomistic simulations and analysis of p(O2)-T-delta diagrams
Место публикации : Solid State Ionics. - 2006. - V. 177, N 5-6. - С. 457-470. - ISSN 0167-2738. - ISSN 0167-2738
Примечания : Библиогр.: с. 469-470 (39 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Atomistic modelling showed that a key factor affecting the p(O2) dependencies of point defect chemical potentials in perovskite-type La0.3Sr0.7Fe1-xM'xO3-delta (M' = Ga, Al; x = 0-0.4) under oxidizing conditions, relates to the coulombic repulsion between oxygen vacancies and/or electron holes. The configurations of A- and B-site cations with stable oxidation states have no essential influence on energetics of the mobile charge carriers, whereas the electrons formed due to iron disproportionation are expected to form defect pair clusters with oxygen vacancies. These results were used to develop thermodynamic models, adequately describing the p(O2)-T-delta diagrams of La0.3Sr0.7Fe(M')O3-delta determined by the coulometric titration technique at 923-1223 K in the oxygen partial pressure range from 1 x 10(-5) to 0.5 atm. The thermodynamic functions governing the oxygen intercalation process were found independent of the defect concentration.Doping with aluminum and gallium leads to increasing oxygen deficiency and induces substantial changes in the behavior of iron cations, increasing the tendencies to disproportionation and hole localization. Despite similar oxygen nonstoichiometry in the Al- and Ga-substituted ferrites at a given dopant content, the latter tendency is more pronounced in the case of aluminum-containing perovskites
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/D 30
Автор(ы) : Shabashov V. A., Borisov S. V., Zamatovsky A. E., Vil'danova N. F., Mukoseev A. G., Litvinov A. V., Shepatkovskii O. R.
Заглавие : Deformation-induced transformations in nitride layers formed in bcc iron
Место публикации : Materials Science & Engineering, A: Structural Materials: Properties, Microstructure and Processing. - 2007. - № A452-A453. - С. 575-583
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): нитриды--железо
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/D 46
Автор(ы) : Sirin A. V., Krasnenko T. I., Mizin V. G., Sirina T. P., Rotermel' M. V., Pozdnyakova O. S.
Заглавие : Desulfurization of recycled vanadium-bearing raw materials
Место публикации : Metallurgist . - 2006. - Vol. 50, № 11-12. - С. 565-570
Примечания : Библиогр. : с. 570 (6 назв.)
ISSN: 0026-0894
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): десульфурация--ванадиевое сырье
Аннотация: A study of model systems that include sodium vanadate, sulfates of nickel, iron, and calcium, and a soda solution made it possible to determine the optimum parameters for desulfurizing high-sulfur wastes formed in the operation of heating and power plants. It is shown that when Ni/V = 0.15–0.33 and Fe/V = 0.5–0.75, 98% of the vanadium and 99.8% of the nickel are precipitated and sulfur content is no greater than 0.2 mass%. This has made it possible to obtain concentrates suitable for the smelting of complex alloys
Полный ресурс
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/E 27
Автор(ы) : Medvedeva N. I., Shein I. R., Konyaeva M. A., Ivanovskii A. L.
Заглавие : Effect of Chromium on the Electronic Structure and Magnetic Properties of Cementite
Место публикации : The Physics of Metals and Metallography. - 2008. - Vol. 105, № 6. - С. 568-573: il.
Примечания : Bibliogr. : p. 572-573 (24 ref.)
ISSN: 0031-918X
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): хром--магнитные свойства--цементит
Аннотация: Using ab initio methods, the influence of chromium on the electron structure and magnetic properties of cementite Fe3C has been investigated depending on the chromium concentration and the possibility of the formation of a chromium carbide Cr3C has been considered. It has been established that it is the general positions of iron in the lattice of cementite that are most energetically preferable for the substitution by chromium. Chromium leads to a strengthening of interatomic interactions and the change in the sign of the enthalpy of formation in the Fe3 –xCrxC system at x= 1.9. The magnetic moments at the atoms of chromium and iron are oriented antiferromagnetically and the total magnetization of the alloyed system decreases with increasing chromium concentration
Полный текст
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Enyashin A. N., Medvedeva N. I., Medvedeva Yu. E., Ivanovskii A. L.
Заглавие : Electronic Structure and Magnetic States of Crystalline and Fullerene-Like Forms of Nickel Dichloride NiCl2
Место публикации : Physics of the Solid State. - 2005. - Vol. 47, № 3. - С. 527-530: il.
Примечания : Bibliogr. : p. 530 (12 ref.)
ISSN: 1063-7834
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): дихлорид никеля--фуллерены--ферромагнетики--стехиометрия
Аннотация: The electronic structure and magnetic properties of the crystalline and fullerene-like forms of nickel dichloride NiC² are investigated in the framework of the local spin density functional theory. It is demonstrated that the band gap can be reproduced in the energy band spectrum of the NiCl² compound with inclusion of the magnetic ordering in the calculation of the band structure. The metamagnetic nature of the NiCl² dichloride (i.e., the transition from an antiferromagnetic phase to a ferromagnetic phase in a weak magnetic field) is explained in terms of a small difference (0.025 eV/cell) between the total energies of the ferromagnetic and antiferromagnetic phases. Polyhedral three-shell nanoparticles of the NiCl² compound exhibit magnetic properties (the magnetic moment of nickel lies in the range 2.0–2.3 µβ). For isostructural nanoparticles of the FeCl² dichloride, the magnetic moment of iron is larger and falls in the range 4.2–4.5 µβ, whereas nanoparticles of the CdCl² dichloride are found to be nonmagnetic. The results of analyzing the interatomic interactions indicate that the composition of fullerene-like nanoparticles of the dichlorides under investigation can deviate from the 1 : 2 stoichiometric composition
Полный текст
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/H 65
Автор(ы) : Leonidov I. A., Patrakeev M. V., Bahteeva J. A., Mitberg E. B., Kozhevnikov V. L., Colomban Ph., Poeppelmeier K. R.
Заглавие : High-temperature phase equilibria in the oxide systems SrFe1-xGaxO2.5-SrFe1-xGaxO3 (x = 0, 0.1, 0.2)
Место публикации : Journal of Solid State Chemistry. - 2006. - Vol. 179, № 4. - С. P.1093-1099
Примечания : Bibliogr. : p. 1099 (17 ref.)
ISSN: 0022-4596
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): фазовые равновесия--системы оксидные--высокотемпературные фазовые диаграммы--галлий--добавки
Аннотация: X-ray powder diffraction, Raman scattering, equilibrium oxygen content and conductivity data are combined to construct high-temperature phase diagrams (T vs. delta) for the oxide systems SrFe1-xGaxO2.5–SrFe1-xGaxO3, where , 0.1, and 0.2. Depending on oxygen content and gallium doping, three different structural types are shown to exist at high temperatures including cubic perovskite-, cubic brownmillerite-, and orthorhombic brownmillerite-type structures. Substitution of gallium for iron is shown to extend the oxygen content and temperature limits where the cubic brownmillerite-type phase is stable
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/I-98
Автор(ы) : Ivanovskaya V. V., Kohler C., Seifert G.
Заглавие : 3d metal nanowires and clusters inside carbon nanotubes: Structural, electronic, and magnetic properties
Место публикации : Physical Review B: Condensed Matter and Materials Physics. - 2007. - Vol. 75, № 7. - С. 075410/1-075410/7
Примечания : Библиогр. : с. 075410/7 (42 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): карбоновые нанотрубки--магнитные свойства
Аннотация: The structure and the properties of the quasi-one-dimensional composites, i.e., carbon nanotubes filled with nanowires or clusters of 3d metals (M=Ti, Fe, and Zn), have been studied in the framework of the density functional-based tight binding method. We show that the accommodation of nanosized metal species inside carbon nanotubes (CNTs) may lead to essential changes of the structural, magnetic, and electronic properties ofthe CNTs and the metal species. Especially, we examined the effect of interactions between iron and carbonatoms on the electronic and magnetic properties of the Fen@CNT composites by comparing with freestandingFe wires and clusters. Our calculations support the increasing of the magnetic moments for both wires as well as clusters encapsulated in CNTs in comparison with bulk bcc Fe and show a strong dependence of magnetic moments on the thickness of the wires and on the size of clusters
Полный текст
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/I-98
Автор(ы) : Ivanovskaya V. V., Ivanovskii A. L.
Заглавие : Quantum-chemical modelling of composite nanomaterials: iron clusters Fen (n = 6, 15, 19) in carbon nanotubes
Место публикации : Theoretical and Experimental Chemistry. - 2006. - Vol. 42, № 4. - С. 239-244: il.
Примечания : Bibliogr. : p. 243-244 (11 ref.)
ISSN: 0040-5760
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): нанокомпозиты--кластеры железа--карбоновые нанотрубки--моделирование
Аннотация: The electronic and magnetic characteristics and the stability of composite nanomaterials Fen@C-NT, which represent ordered unidimensional assemblies of iron clusters Fen (n = 6, 15, and 19) inside carbon nanotubes, were analyzed for the first time by the electron density functional tight binding (DFTB) method
Полный текст
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/K 72
Автор(ы) : Konyaeva M. A., Medvedeva N. I.
Заглавие : Electronic Structure, Magnetic Properties, and Stability of the Binary and Ternary Carbides (Fe,Cr)3C and (Fe,Cr)7C3
Место публикации : Physics of the Solid State. - 2009. - Vol. 51, № 10. - С. 2084-2089: il.
Примечания : Bibliogr. : p. 2088-2089 (29 ref.)
ISSN: 1063-7834
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): карбид железа--карбид хрома--карбиды бинарные--карбиды тройные
Аннотация: The structural, electronic, and magnetic properties of the binary and ternary carbides (Fe,Cr)3C and (Fe,Cr)7C3 have been investigated within the ab initio density functional theory. The crystal structure of the binary carbides has been optimized and the preferred positions for replacement of chromium or iron impurities in the corresponding carbides have been determined. The changes in the electronic structure and magnetic properties have been investigated, the formation energies of the ternary carbides as functions of the impurity concentrations have been calculated, and conclusions have been drawn regarding the influence of the impurity on the stability of the carbides under investigation
Полный текст
Найти похожие

10.

Вид документа : Статья из журнала
Шифр издания : 54/K 81
Автор(ы) : Krasil'nikov V. N., Gyrdasova O. I., Bazuev G. V.
Заглавие : Ethylene Glycol-Modified Cobalt and Iron Oxalates As Precursors for the Synthesis of Oxides As Extended Microsized and Nanosized Objects
Место публикации : Russian Journal of Inorganic Chemistry. - 2008. - Vol. 53, № 12. - С. 1854-1861: il.
Примечания : Bibliogr. : p. 1860-1861 (18 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): этиленгликоль--кобальт--оксиды--оксалат железа
Аннотация: The reactions of ethylene glycol with iron and cobalt oxalates upon heating in air are reported. Heat treatment of mixtures of oxalate powders with ethylene glycol yields new compounds (solvates) via the replacement of the water molecules in the oxalate structure by ethylene glycol molecules: MC2O4·2H2O+HOCH2CH2OH=MC2O4(HOCH2CH2OH)+2H2O↑. The crystals resulting from this reaction are elongated, and their shape is inherited by their thermolysis products. Thermolysis in air yields microwhiskers and nanowhiskers of Fe2O3and Co3O4, and thermolysis in an inert atmosphere affords Fe3O4and Co whiskers. The thermolysis of FeC2O4(HOCH2CH2OH) in helium yields a new structural modification of FeC2O4 as an intermediate product. The resulting compounds and their thermolysis products were characterized by X-ray powder diffraction, microscopy, IR spectroscopy, and thermogravimetric and chemical analyses. The particle shape and size were determined by scanning electron microscopy
Полный текст
Найти похожие

11.

Вид документа : Статья из журнала
Шифр издания : 54/K 93
Автор(ы) : Kurlov A. S., Nazarova S. Z., Gusev A. I.
Заглавие : Magnetic susceptibility and thermal stability of particle size of nanocrystalline tungsten carbide WC
Место публикации : Physics of the Solid State. - 2007. - Vol. 49, № 9. - С. 1780-1786
Примечания : Библиогр. : с. 1786 (13 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): магнитная восприимчивость--термическая устойчивость--карбид вольфрама--нанокристаллические карбиды
Аннотация: The magnetic susceptibility χ of coarse-grained and nanocrystalline tungsten carbides was studied in the temperature range 300–1250 K. The temperature dependence of the susceptibility χ(T) of coarse-grained carbide WC is typical of weak Pauli paramagnets and has no specific features. The χ(T) dependence of nanocrystalline carbide (n-WC) in the range 550–920 K exhibits features associated with annealing of microstrains, which leads to a decrease in the contribution of orbital paramagnetism to the magnetic susceptibility of n-WC and initiates precipitation of minor impurities of iron and cobalt as superparamagnetic particles. A nanocrystalline n-WC powder retains a stable particle size of ~55 nm after long annealing at temperatures of 300 to 1200 K, whereas microstrains relax at 550–920 K
Полный текст
Найти похожие

12.

Вид документа : Статья из журнала
Шифр издания : 54/L 55
Автор(ы) : Leonidov I. A., Patrakeev M. V., Kozhevnikov V. L.
Заглавие : The Thermodynamic Properties of Weakly Bound Oxygen and Electron Transport in Sr3Fe2O6 +δ under Oxidizing Conditions
Место публикации : Russian Journal of Physical Chemistry. - 2006. - Vol. 80, № 4. - С. P. 523-528: ил.
Примечания : Bibliogr. : p. 528 (14 ref.)
ISSN: 0036-0244
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): свойства термодинамические--оксиды--электронный транспорт--перовскиты--феррит стронция
Аннотация: The content of oxygen, electrical conductivity, and thermal electromotive force were measured for ferrite Sr3Fe2O6+delta over the oxygen partial pressure range 10(-4)-0.5 atm at 650-950C. The partial molar thermodynamic functions of weakly bound oxygen in the oxide structure were determined. Labile oxygen ions were characterized as an ensemble of weakly interacting particles. The predominant charge carriers under experimental conditions were electron holes. An analysis of conductivity was performed using the data on the oxygen content. The concentration, activation energy, and mobility of charge carriers were determined. The results can be satisfactorily interpreted using the polaron transfer model of conductivity taking into account the charge disproportionation reaction for iron ions, 2Fe(4+)=Fe(3+)+Fe(5+)
Полный текст
Найти похожие

13.

Вид документа : Статья из журнала
Шифр издания : 54/L 67
Автор(ы) : Lichtenstein A. I., Katsnelson M. I., Gubanov V. A.
Заглавие : Local spin excitation and Curie temperature of iron
Место публикации : Solid State Communications. - 1985. - V. 54. - С. 327-329. - ISSN 0038-1098. - ISSN 0038-1098
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): химия--железо--fe--намагничивание--температура кюри
Найти похожие

14.

Вид документа :
Шифр издания : 54/M 17
Автор(ы) : Seregin S. V., Gizhevskii B. A., Doroshenko R. A., Gaviko V. S., Lobachevskaya N. I.
Заглавие : Magnetic Properties of Nanostructured Samples of Yttrium Iron Ferrite–Garnet Obtained by Severe Plastic Deformation
Место публикации : Bulletin of the Russian Academy of Sciences: Physics. - 2010. - Vol. 74, № 10. - С. P. 1437-1439: il.
Примечания : Bibliogr. : p. 1439 (4 ref.)
ISSN: 1062-8738
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): феррит иттрия--свойства магнитные--деформация пластическая
Аннотация: The magnetic properties of nanoceramics of yttrium iron ferrite–garnet obtained by severe plastic deformation were investigated using the self excited oscillator method. It is found that the coercive force and anisotropy field increase with an increase in strain and a decrease in the crystallite size
\\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2010, V. 74, N 10, P.1437-1439.pdf
Найти похожие

15.

Вид документа : Статья из журнала
Шифр издания : 54/M 46
Автор(ы) : Medvedeva N. I., Kar'kina L. E., Ivanovskii A. L.
Заглавие : Effect of Chromium on the Electronic Structure of the Cementite Fe3C
Место публикации : Physics of the Solid State. - 2006. - Vol. 48, № 1. - С. 15-19: il.
Примечания : Bibliogr. : p. 19 (15 ref.)
ISSN: 1063-7834
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): хром--электронная структура--цементиты
Аннотация: The effect of alloying of the cementite Fe3C with chromium on the band structure, atomic interactions, electric field gradients, and asymmetry parameters for iron nuclei is investigated using the self-consistent full-potential linear muffin-tin orbital (FPLMTO) method. An increase in the cohesive energy for the Fe3C–Cr system indicates an enhancement of the atomic interactions in the lattice of the cementite alloyed with chromium. It is found that the substitution of chromium for iron in the FeII positions containing eight equivalent iron atoms is energetically most favorable
Полный текст
Найти похожие

16.

Вид документа : Статья из журнала
Шифр издания : 54/M 46
Автор(ы) : Medvedeva N. I., Kar'kina L. E., Ivanovskii A. L.
Заглавие : Electronic Structure and Magnetic Properties of the alfa and gamma Phases of Iron, Their Solutions with Carbon, and Cementite
Место публикации : The Physics of Metals and Metallography. - 2006. - Vol. 101, № 5. - С. 440-445: il.
Примечания : Bibliogr. : p. 444-445 (31 ref.)
ISSN: 0031-918X
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): железо--твердые растворы--углерод
Аннотация: The full-potential LMTO method was used to comparatively analyze the band structure, magnetic and cohesive characteristics, energies of formation of α and γ iron, their carbon solid solutions, and cementite. It has been found that the solid solution γ-Fe + C, similarly to γ-Fe, is characterized by an antiinvar transition and that cementite demonstrates invar behavior. The similarity of curves of the density of states, cohesive energies, and magnetic moments for the supersaturated solid solution of carbon in the fcc iron and cementite suggests the preferable formation of cementite in regions of concentration inhomogeneity of carbon distribution in the solid solution of γ iron the solid solution of γ iron
Полный текст
Найти похожие

17.

Вид документа : Статья из журнала
Шифр издания : 54/M 46
Автор(ы) : Medvedeva N. I., Kar'kina L. E., Ivanovskii A. L.
Заглавие : Electronic structure and magnetic properties of б- and г- phases of iron, their solid solutions with carbon, and of cementite
Место публикации : Physics of the Solid State. - 2006. - Vol. 48, № 1. - С. 15-19
Примечания : Библиогр. : с. 19 (15 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Найти похожие

18.

Вид документа : Статья из журнала
Шифр издания : 54/M 88
Автор(ы) : Borukhovich A. S., Ignat’eva N. I., Yanushkevich K. I., Stognij A. I., Fedotova Yu. A.
Заглавие : Mössbauer Spectroscopy Study of the EuO:Fe Spintronic Material
Место публикации : JETP Letters. - 2009. - Vol. 89, № 4. - С. 191-193: il.
Примечания : Bibliogr. : p. 193 (8 ref.)
ISSN: 0021-3640
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): мессбауэровская спектроскопия--оксид европия
Аннотация: The states of iron and europium in the EuO:Fe composite spintronic material have been studied by means of room-temperature Mössbauer spectroscopy. In both cases, two sets of lines indicating the ferromagnetism and superparamagnetism of metallic iron nanoparticles in the composite and the appearance of a fraction of europium ions in the Eu3+ oxidation state in the matrix in addition to the main Eu2+ state have been observed in the respective spectra. In the europium case, the observation implies the possibility of a partial spin polarization of paramagnetic europium ions in Eu–Fe–O clusters and an increased specific magnetization of the composite
Полный текст
Найти похожие

19.

Вид документа : Статья из журнала
Шифр издания : 54/N 91
Автор(ы) : Pletnev R. N., Volkov V. L., Pekala M., Polazek A.
Заглавие : Nuclear magnetic resonance of (51)V in the iron and aluminium vanadium oxide bronzes MxV2O5 (M = Al, Fe)
Место публикации : Physica Status Solidi A. - 1980. - V. 58, N 1. - С. K17-K18. - ISSN 0031-8965. - ISSN 0031-8965
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): химия--ядерный магнитный резонанс--ямр--al--fe--v--алюминий--ванадий--железо--оксидные ванадиевые бронзы
Найти похожие

20.

Вид документа : Статья из журнала
Шифр издания : 54/O-66
Автор(ы) : Gizhevsky B. A., Sukhorukov Yu. P., Gan’shina E. A., Loshkareva N. N., Telegin A. V., Lobachevskaya N. I., Gaviko V. S., Pilyugin V. P.
Заглавие : Optical and Magneto-Optical Properties of Nanostructured Yttrium Iron Garnet
Место публикации : Physics of the Solid State. - 2009. - Vol. 51, № 9. - С. 1836-1842: il.
Примечания : Bibliogr. : p. 1841-1842 (21 ref.)
ISSN: 1063-7834
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): гарнеты--иттрий--железо--магнетооптические свойства
Аннотация: Bulk dense samples of nanostructured yttrium iron garnet Y3Fe5O12 with crystallite sizes of 20–40 nm are prepared by high pressure torsion from a garnet powder with micron grains. The absorption and Faraday rotation spectra in the IR range and the transverse Kerr effect spectra in the visible spectral range for these samples are measured. The absorption and magneto optical effect spectra are in agreement with the corresponding spectra of single crystals. The appearance of additional absorption bands at 2 and 3 μm is associated with the violation of the stoichiometry of the nanogarnet and the possible contamination of the initial material. The specific Faraday rotation in the transparency window is approximately 1.5 times smaller than the corresponding quantity for single crystals. The extrema in the Kerr effect spectra coincide with those for single crystals, are smaller in magnitude, and are smeared. On the whole, the prepared bulk samples are transparent in the IR spectral range and exhibit optical and magneto optical characteristics comparable to the corresponding parameters for single crystals. The high density of point defects of the nanogarnet is primarily due to the violation of the stoichiometry and the valence state of iron ions
Полный текст
Найти похожие

1-20 21-40 41-53

Сиглы отделов ЦНБ УрО РАН

  бр.ф. - Бронированный фонд

  бф - Научно-библиографический отдел

  БХЛ - Фонд художественной литературы

  ИИиА -Фонд исторической литературы в ЦНБ УрО РАН

  ИМЕТ -Отдел ЦНБ в Институте металлургии УрО РАН

  кх - Отдел фондов (книгохранениe)

  МБА - Межбиблиотечный абонемент

  мф - Методический фонд

  ок - Отдел научной каталогизации

  оку - Отдел комплектования и учета

  орф - Обменно-резервный фонд

  пф - Читальный зал деловой и патентной информации

  рк - Фонд редкой книги

  ч/з - Главный читальный зал

  эр - Зал электронных ресурсов

Сиглы библиотек институтов и НЦ УрО РАН

© Международная Ассоциация пользователей и разработчиков электронных библиотек и новых информационных технологий
(Ассоциация ЭБНИТ)