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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Bulavchenko O. A., Dubrovskii A. A., Tsybulya S. V., Cherepanova S. V., Gerasimov E. Y., Shaikhutdinov K. A.
Заглавие : Features of the structure, microstructure, and magnetic properties of manganese-aluminum spinels obtained in various thermal treatment conditions
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2013. - Vol. 55, Is. 7. - P.1401-1406. - ISSN 1063-7834, DOI 10.1134/S1063783413070056
Примечания : Cited References: 18. - This study was supported by the Russian Foundation for Basic Research (project no. 12-03-90839-mol_rf_nr) and the Ministry of Education and Science of the Russian Federation (agreement no. 8429).
Предметные рубрики: A-SITE SPINELS
CATALYSTS
OXIDE
MN3O4
Аннотация: The structural, microstructural, and magnetic properties of aluminum-manganese oxide in the ratio Mn: Al = 1: 1 in the well-crystallized and nanoheterogeneous states have been investigated. This oxide is obtained under various thermal treatment conditions and at different partial pressures of oxygen. The composition and cation distribution of the manganese and aluminum ions in spinel sites are determined. It is shown that the studied compound is a ferrimagnet with the Curie point T (C) a parts per thousand 26 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yakushkin S. S., Dubrovskiy A. A., Balaev A. D., Shaykhutdinov K. A., Bukhtiyarova G. A., Martyanov O. N.
Заглавие : Magnetic properties of few nanometers ɛ-Fe2O3 nanoparticles supported on the silica
Место публикации : J. Appl. Phys.: American Institute of Physics, 2012. - Vol. 111, Is. 4. - Ст.44312. - ISSN 0021-8979, DOI 10.1063/1.3686647
Примечания : Cited References: 27. - authors thank A. D. Balaev and N. V. Volkov for fruitful discussions and comments. This work was supported by Program of RAS No. 27.46.
Предметные рубрики: HIGH-TEMPERATURE
IRON
STABILIZATION
OXIDE
GEL
Аннотация: Magnetic properties of ɛ-Fe2O3nanoparticles supported on silica with the average size of few nanometers, narrow size distribution and no admixture of any other iron oxide polymorphs are investigated. The investigation of the temperature behavior of magnetization within the temperature range from 4.2 to 1000 K revealed the presence of several magnetic subsystems in the species under study. The temperatures’ behavior of the magnetic moment value indicates ferrimagnetic ordering in the ɛ-Fe2O3nanoparticles with a Curie temperature of about 800 K and points to the existence of a significant paramagnetic contribution becoming apparent at low temperatures. According to the electron spin resonance data, the particles possess superparamagnetic behavior at temperature higher ∼120 K. The model of the magnetic structure of monophase system of few nanometers ɛ-Fe2O3nanoparticles supported on silica is proposed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Tambasov I. A., Bayukov O. A., Zhigalov V. S., Bykova L. E., Mikhlin Yu. L., Volochaev M. N., Bondarenko G. N.
Заглавие : Solid state synthesis and characterization of ferromagnetic nanocomposite Fe-In2O3 thin films
Место публикации : J. Alloys Compd.: Elsevier Science, 2014. - Vol. 612. - P.189-194. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2014.05.176. - ISSN 1873-4669
Примечания : Cited References: 56
Предметные рубрики: HIGH-TEMPERATURE FERROMAGNETISM
PHASE-FORMATION
In2O
OXIDE
NANOPARTICLES
CO
SEMICONDUCTORS
NANOCRYSTALS
COMBUSTION
SYSTEMS
Ключевые слова (''Своб.индексиров.''): thermite reactions--reactive films--ferromagnetic nanocomposite films--transparent conducting oxides
Аннотация: We have successfully synthesized ferromagnetic Fe-In2O 3 nanocomposite thin films for the first time using the thermite reaction Fe2O3 + In = In2O3 + Fe. The initial In/Fe2O3 bilayers were obtained by the deposition of In layers on α-Fe2O3 films. The reaction occurs in a self-propagating mode in a homogeneous thermal film plane field at heating rates above 20 K/s and at temperatures above initiation temperature T[[d]]in[[/d]] ~ 180 °C. At heating rates lower than 20 K/s the mixing of the In and Fe2O3 layers occurs across the whole In/Fe2O3 interface and the synthesis of the ferromagnetic α-Fe phase starts above the initiation temperature T[[d]]in[[/d]] = 180 °C. X-ray diffraction, X-ray photoelectron spectroscopy, Mossbauer spectroscopy, transmission electron microscopy and magnetic measurements were used for phase identification and microstructure observation of the synthesized Fe-In2O3 samples. The reaction products contain (1 1 0) textured α-Fe nanocrystals with a diameter around 100 nm and surrounded by an In2O3 matrix. These results enable new efficient low-temperature methods for synthesizing ferromagnetic nanocomposite films containing ferromagnetic nanoclusters embedded in transparent conducting oxides. © 2014 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smirnov M. B., Roginskii E. M., Kazimirov V. Y., Smirnov K. S., Baddour-Hadjean R., Pereira-Ramos J. P., Zhandun V. S.
Заглавие : Spectroscopic and computational study of structural changes in γ-LiV2O5 cathodic material induced by lithium intercalation
Место публикации : J. Phys. Chem. C: American Chemical Society, 2015. - Vol. 119, Is. 36. - P.20801-20809. - ISSN 1932-7447, DOI 10.1021/acs.jpcc.5b05540
Примечания : Cited References: 36. - This work was supported by the international collaboration program between the Centre National de la Recherche Scientifique (CNRS) of France and the Russian Foundation for Basic Research (RFBR), LIBASTRAM CNRS Project 6094, and RFBR Grant 13-03-91052.
Предметные рубрики: AUGMENTED-WAVE METHOD
LIXV2O5 SYSTEM
AB-INITIO
VANADIUM PENTOXIDE
RAMAN-SPECTROSCOPY
LI INTERCALATION
OXIDE
V2O5
TRANSITION
TRANSITION
Аннотация: Structure, electronic states, and vibrational dynamics of γ-LiV2O5 were studied by combined use of quantum-chemical calculations and Raman spectroscopy. The spin-polarized DFT+U calculations correctly mimic the structural changes induced by the Li intercalation into the V2O5 framework. The analysis of the density of electronic states shows that the electrons of Li atoms are transferred to the Vb atoms and are aligned in ferromagnetic order. The charge distribution in the system reflects the change of valence state of the Vb atoms from 5+ to 4+, and it is in line with changes of Vb–O bond lengths. The calculated Raman spectrum of the γ-LiV2O5 structure is in line with the experimental Raman spectra that allows a reliable assignment of all prominent Raman peaks. Comparison of the spectra of γ-LiV2O5 and γ'-V2O5 indicates spectral signatures of structural changes induced by the Li insertion into the γ'-V2O5 lattice. Results of the study present the opportunity of using Raman spectroscopy for characterization of structural modifications of the vanadate framework upon intercalation of guest species.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Zhigalov V. S., Bykova L. E., Zharkov S. M., Matsynin A. A., Volochaev M. N., Tambasov I. A., Bondarenko G. N.
Заглавие : Thermite synthesis and characterization of Co-ZrO2 ferromagnetic nanocomposite thin films
Место публикации : J. Alloys Compd.: Elsevier, 2016. - Vol. 665. - P.197-203. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2015.12.257
Примечания : Cited References: 56. - This study was partially supported by the Russian Foundation for Basic Research (grants ##15-02-00948, 14-03-00515), by the Council for Grants of the President of the Russian Federation (SP-317.2015.1), and by the program of the Foundation for Assistance to Small Innovative Enterprises in Science and Technology (“UMNIK” program). The TEM studies were carried out using the facilities of Electron Microscopy Laboratory of Siberian Federal University and the Performance Service at Krasnoyarsk Scientific Center.
Предметные рубрики: SOLID-STATE SYNTHESIS
PHASE-FORMATION
ZrO2
NANOPARTICLES
TRANSPORT
OXIDE
MICROSTRUCTURE
NANOTHERMITE
FABRICATION
PARTICLES
Ключевые слова (''Своб.индексиров.''): thermite reactions--reactive films--ferromagnetic nanocomposite films--zro2
Аннотация: Co-ZrO2 ferromagnetic nanocomposite thin films were successfully synthesized using a new thermite reaction between Zr and Co3O4 in layer geometry. The initial Zr/Co3O4 bilayers were obtained by the deposition of Zr layers onto Co3O4 films at room temperature. The process of mixing at the Zr/Co3O4 interface and synthesis of fine-crystalline Co and amorphous ZrO2 phases started at a temperature above the initiation temperature Tin ∼250 °C which did not depend on the bilayer thickness. For the bilayer thickness more than 300 nm high-temperature fcc-Co and cubic c-ZrO2 (or tetragonal t-ZrO2) phases were formed. For the bilayer thickness less than ∼50 nm stable low-temperature hexagonal hcp-Co and monoclinic m-ZrO2 phases were also present in the reaction product. A partial transformation from Co3O4 to CoO occurred after annealing at 300 °C. The secondary reaction between CoO and Zr started soon after Co3O4 had been converted to the CoO phase. After annealing at 500 °C more than 80% of Co was reduced and the final product contained Co nanoparticles above and below the superparamagnetic critical size embedded into a dielectric ZrO2 matrix. The synthesized Co-ZrO2 nanocomposite films possessed soft magnetic behavior, high magnetization and good chemical stability.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronin A. S., Ivanchenko F. S., Simunin M. M., Shiverskiy A. V., Aleksandrovsky A. S., Nemtsev I. V., Fadeev Y. V., Karpova D. V., Khartov S. V.
Заглавие : High performance hybrid rGO/ Ag quasi-periodic mesh transparent electrodes for flexible electrochromic devices
Место публикации : Appl. Surf. Sci.: Elsevier Science, 2016. - Vol. 364. - P.931–937. - ISSN 0169-4332, DOI 10.1016/j.apsusc.2015.12.182. - ISSN 1873-5584
Примечания : Cited References: 31
Предметные рубрики: NANOWIRE NETWORKS
GRAPHENE FILMS
OXIDE
OXIDATION
HEATERS
Ключевые слова (''Своб.индексиров.''): quasi-periodic mesh transparent electrode self-organized template--reduced graphene oxide (rgo)--flexible electrochromic device
Аннотация: A possibility of creating a stable hybrid coating based on the hybrid of a reduced graphene oxide (rGO)/ Ag quasi-periodic mesh (q-mesh) coating has been demonstrated. The main advantages of the suggested method are the low cost of the processes and the technology scalability. The Ag q-mesh coating is formed by means of the magnetron sputtering of silver on the original template obtained as a result of quasi-periodic cracking of a silica film. The protective rGO film is formed by low temperature reduction of a graphene oxide (GO) film, applied by the spray-deposition in the solution of NaBH4. The coatings have low sheet resistance (12.3 Ω/sq) and high optical transparency (82.2%). The hybrid coating are characterized by high chemical stability, as well as they show high stability to deformation impacts. High performance of the hybrid coatings as electrodes in the sandwich-system «electrode – electrochromic composition – electrode» has been demonstrated. The hybrid electrodes allow the electrochromic sandwich to function without any visible degradation for a long time, while an unprotected mesh electrode does not allow performing even a single switching cycle.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Uschakov A. V., Karpov I. V., Lepeshev A. A., Zharkov S. M.
Заглавие : The influence of oxygen concentration on the formation of CuO and Cu2O crystalline phases during the synthesis in the plasma of low pressure arc discharge
Место публикации : Vacuum: Elsevier, 2016. - Vol. 128. - P.123-127. - ISSN 0042207X (ISSN), DOI 10.1016/j.vacuum.2016.03.025
Примечания : Cited References: 19. - This study was supported by the Russian Foundation for Basic Research. (Project No 15-08-02132).
Предметные рубрики: Nanoparticles
Oxide
Ключевые слова (''Своб.индексиров.''): oxides--vapor deposition--x-ray diffraction--transmission electron microscopy (tem)--catalytic properties
Аннотация: This paper describes the synthesis of copper oxide nanoparticles with different percentages of CuO and Cu2O phases. It was achieved by the control of the percentage of oxygen in the gas mixture (N2 + O2) in a plasma-chemical process of evaporation-condensation by means of low-pressure arc discharge. In all the experiments, the pressure in the plasma-chemical reactor remained constant at 60 Pa. By means of X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR) it was found that the average particle size was 6 nm, and Cu2O phase content decreases with increasing oxygen content in the gas mixture. High photocatalytic properties of Cu2O powder were shown by the example of the reaction of the methyl orange dye decomposition in water solution. The problems, associated with the performance of this method and the formation of crystalline phases, are discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Yakushkin S. S., Dubrovskii A. A., Bukhtiyarova G. A., Shaikhutdinov K. A., Martyanov O. N.
Заглавие : Study of the high-coercivity material based on ε-Fe2O3 nanoparticles in the silica gel matrix
Место публикации : Tech. Phys. Lett.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 42, Is. 4. - P.347-350. - ISSN 10637850 (ISSN), DOI 10.1134/S1063785016040039
Примечания : Cited References: 17. - This study was supported by the Federal Agency for Scientific Organizations of Russia (base budget financing no. V.44.1.15), the Scientific and Educational Center of Energy-Efficient Catalysis at the Novosibirsk State University, and the Russian Foundation for Basic Research (project no. 15-32-50919).
Предметные рубрики: Phase
Field
State
Oxide
Iron
Аннотация: We report the results of investigations of ε-Fe2O3 magnetic nanoparticles obtained by incipient wetness impregnation of silica gel. It was established that the obtained samples with an iron content of 12‒16% mass % containing ε-Fe2O3 nanoparticles with an average size of 10 nm on the silica gel surface exhibit a room-temperature coercivity of about 10 kOe. Along with fabrication simplicity, this fact makes the prepared samples promising for application as a magnetically hard material. © 2016, Pleiades Publishing, Ltd
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Orlov Yu. S., Gavrilkin S. Yu., Gorev M. V., Vereshchagin S. N., Solovyov L. A., Perov N. S., Ovchinnikov S. G.
Заглавие : Effect of Gd and Sr ordering in a sites of doped Gd0.2Sr0.8CoO3-δ perovskite on its structural, magnetic, and thermodynamic properties
Место публикации : J. Phys. Chem. C: American Chemical Society, 2016. - Vol. 120, Is. 25. - P,13443-13449. - ISSN 19327447 (ISSN), DOI 10.1021/acs.jpcc.6b04810
Примечания : Cited References: 45. - The authors are thankful to the Russian Science Foundation (Project No. 16-13-00060) for financial support. The magnetic measurements were carried out in the Shared Facility Centre of P. N. Lebedev Physical Institute of RAS.
Предметные рубрики: Ln1-xSrxCoO(3-δ) Ln
PROFILE REFINEMENT
CRYSTAL-STRUCTURE
OXYGEN-CONTENT
COBALTITES
OXIDE
La1-xSrxCoO3-δ
Dy3+
SPIN
Ho3+
Аннотация: Magnetic and thermodynamic properties of perovskite Gd0.2Sr0.8CoO3−δ, with ordered and disordered states of Gd and Sr in the A-sites of the crystal lattice have been studied revealing remarkable differences in the physical properties of the ordered and disordered states. The ordered samples have larger oxygen nonstoichiometry, heat capacity, and thermal expansion anomalies, and abnormal temperature dependence of the magnetization around 350 K.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov A. E., Temerov V. L., Bezmaternykh L. N., Sukhachev A. L., Seredkin V. A., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G.
Заглавие : Polarized absorption spectra and spectroscopic parameters of Tm3+ in the TmAl3(BO3)(4) single crystal
Разночтения заглавия :авие SCOPUS: Polarized absorption spectra and spectroscopic parameters of Tm 3+ in the TmAl3(BO3)4 single crystal
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 50, Is. 7. - P1287-1293. - ISSN 1063-7834, DOI 10.1134/S1063783408070159
Примечания : Cited References: 36
Предметные рубрики: RARE-EARTH IONS
ELECTRONIC ENERGY LEVELS
DIODE-PUMPED LASER
OPTICAL-ABSORPTION
ALUMINUM GARNET
MU-M
INTENSITIES
FLUORESCENCE
GLASSES
OXIDE
Аннотация: High-optical-quality single crystals of the TmAl3(BO3)(4) compound were synthesized from a solution in the melt. The absorption spectra in the sigma and pi polarizations for the H-3(6) - F-3(4), H-3(6) - H-3(5), H-3(6) - H-3(4), H-3(6) - F-3(3), H-3(6) - F-3(2), H-3(6) - (1)G(4), and H-3(6) - D-1(2) transitions in the Tm3+ ion were recorded at room temperature. The transition intensities were analyzed in the framework of the Judd-Ofelt theory generalized to the case of anisotropic crystals, and the following parameters of the theory were obtained: Omega(2) = 6.14 x 10(-20) cm(2), Omega(4) = 3.09 x 10(-20) cm(2), and Omega(6) = 2.04 x 10(-20) cm(2). The lifetimes and the branching ratios were determined for all possible transitions.
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