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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Балаев, Дмитрий Александрович, Булавченко О. А., Дубровский, Андрей Александрович, Цыбуля С. В., Черепанова С. В., Герасимов Е. Ю., Шайхутдинов, Кирилл Александрович
Заглавие : Особенности структуры, микроструктуры и магнитных свойств марганец-алюминиевых шпинелей, полученных при различных условиях термообработки
Место публикации : Физ. тверд. тела. - 2013. - Т. 55, Вып. 7. - С. 1304-1309
Аннотация: Исследованы структурные, микроструктурные и магнитные характеристики алюмомарганцевого оксида в соотношении Mn : Al = 1: 1 в хорошо окристаллизованном и наногетерогенном состояниях, получаемого при различных условиях температурной обработки и разном парциальном давлении кислорода. Определены состав и катионное распределение ионов марганца и алюминия в позициях шпинели. Показано, что исследованное соединение является ферримагнетиком с точкой Кюри TC~ 26 K. Работа выполнена при частичной поддержке гранта РФФИ N 12-03-90839-мол\_рф\_нр, программы Министерства образования и науки РФ (соглашение N 8429).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Valiev U. V., Gruber J. B., Sardar D. K., Zandi B., Kachur I. S., Mukhammadiev A. K., Piryatinskaya V. G., Sokolov V. Y., Edelman I. S.
Заглавие : Zeeman effect and stark splitting of the electronic states of the rare-earth ion in the paramagnetic terbium garnets Tb3Ga5O12 and Tb3Al5O12
Разночтения заглавия :авие SCOPUS: Zeeman effect and stark splitting of the electronic states of the rare-earth ion in the paramagnetic terbium garnets Tb3Ga 5O12 and Tb3Al5O12
Место публикации : Phys. Solid State. - 2007. - Vol. 49, Is. 1. - P.91-98. - ISSN 1063-7834, DOI 10.1134/S1063783407010167
Примечания : Cited References: 14
Предметные рубрики: YTTRIUM-ALUMINUM-GARNET
SELECTIVE POLARIZED SPECTROSCOPY
CRYSTAL-FIELD ANALYSIS
GALLIUM GARNET
Аннотация: The Zeeman effect in the F-7(6) - D-5(4) absorption band of the Tb3+ ion in the paramagnetic garnets Tb3Ga5O12 and Tb3Al5O12 was Studied. The field dependences of the Zeeman splitting of some absorption lines arc found to exhibit unusual behavior: as the magnetic field increases, the hand splitting decreases rather than increases. Symmetry analysis relates these lines to 4f - 4f electron transitions of the doublet-quasi-doublet or quasi-doublet-doublet type, for which the field dependences of the splitting differ radically from the well-known field dependences of the Zeeman splitting for quasi-doublet-quasi-doublet or quasi-doublet-singlet transitions in a longitudinal magnetic field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A.S., Bezmaternykh L.N., Bovina A.F., Gudim I.A., Kharlamova S.A., Krylov A.S., Melnikova S.V., Temerov V.Ye.
Заглавие : Unusual Valence States of Manganese Ions in Gadolinium Gallium Aluminum Borate Single Crystals
Место публикации : Известия высших учебных заведений. Физика. - 2008. - Т. 51, № 10/2. - С. 115-119
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zharkov S. M., Yumashev V. V., Moiseenko E. T., Altunin R. R., Solovyov L. A., Volochaev M. N., Zeer G. M., Nikolaeva N. S., Belousov O. V.
Заглавие : Thermokinetic study of aluminum-induced crystallization of a-Si: The effect of Al layer thickness
Колич.характеристики :24 с
Место публикации : Nanomaterials. - 2023. - Vol. 13, Is. 22. - Ст.2925. - ISSN 20794991 (eISSN), DOI 10.3390/nano13222925
Примечания : Cited References: 70. - This work was supported by the Russian Science Foundation under grant #22-13-00313
Аннотация: The effect of the aluminum layer on the kinetics and mechanism of aluminum-induced crystallization (AIC) of amorphous silicon (a-Si) in (Al/a-Si)n multilayered films was studied using a complex of in situ methods (simultaneous thermal analysis, transmission electron microscopy, electron diffraction, and four-point probe resistance measurement) and ex situ methods (X-ray diffraction and optical microscopy). An increase in the thickness of the aluminum layer from 10 to 80 nm was found to result in a decrease in the value of the apparent activation energy Ea of silicon crystallization from 137 to 117 kJ/mol (as estimated by the Kissinger method) as well as an increase in the crystallization heat from 12.3 to 16.0 kJ/(mol Si). The detailed kinetic analysis showed that the change in the thickness of an individual Al layer could lead to a qualitative change in the mechanism of aluminum-induced silicon crystallization: with the thickness of Al ≤ 20 nm. The process followed two parallel routes described by the n-th order reaction equation with autocatalysis (Cn-X) and the Avrami–Erofeev equation (An): with an increase in the thickness of Al ≥ 40 nm, the process occurred in two consecutive steps. The first one can be described by the n-th order reaction equation with autocatalysis (Cn-X), and the second one can be described by the n-th order reaction equation (Fn). The change in the mechanism of amorphous silicon crystallization was assumed to be due to the influence of the degree of Al defects at the initial state on the kinetics of the crystallization process.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkova I. R., Tyryshkina L. E., Volochaev M. N., Zaloga A. N., Shabanova K. A., Ovchinnikov A. V., Lyamkin A. I.
Заглавие : The effect of aluminum-oxide powders on the structure and properties of copper electrodeposited composite coatings
Место публикации : Prot. Met. Phys. Chem. Surf. - 2023. - Vol. 59, Is. 1. - P.71-75. - ISSN 20702051 (ISSN), DOI 10.1134/S2070205122700022. - ISSN 2070206X (eISSN)
Примечания : Cited References: 9
Аннотация: Copper electrodeposited composite coatings containing two types of aluminum-oxide powders with different dispersities (alumina Al2O3-1 and electroexplosive aluminum-oxide nanopowder Al2O3-2) are obtained during the work. The studies show that introducing the powders leads to a change in the microstructure of the composites and a change in the grain growth principles during the formation of the coatings. Refinement and ordering of the grain structure of the coatings occurs and twinning defects and texture are formed. The change in the formation of the microstructure of the composites leads to a change in some operational characteristics: an increase in the microhardness (by 10% in the composites with the addition of alumina and by more than 30% in the coatings with electroexplosive aluminum oxide) and ultimate tensile strength (by 20% in the composites with Al2O3-1 and almost 1.5-fold in the samples with Al2O3-2).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzmenko A. M., Ivanov V. Yu., Tikhanovsky A. Yu., Pimenov A. G., Shuvaev A. M., Gudim I. A., Mukhin A. A.
Заглавие : Terahertz spectroscopy of magnetoelectric HoAl3(BO3)4
Колич.характеристики :6 с
Место публикации : Opt. Spectrosc. - 2023. - Vol. 131, Is. 6. - P.409-414. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X23020121. - ISSN 15626911 (eISSN)
Примечания : Cited References: 18. - This study was partially financially supported by the Russian Science Foundation (project 16-12-10531)
Аннотация: Experimental and theoretical study of submillimeter (terahertz) spectroscopic and magnetic properties of the rare-earth aluminum borate HoAl3(BO3)4 were performed at temperatures 3–300K. In the transmittance spectra a number of resonance lines were detected at frequencies 2–35 cm–1 for different radiation polarizations. These modes were identified as transitions between the lower levels of the ground multiplet of the Ho3+ ion split by the crystal field, including both transitions from the ground state to the excited ones and transitions between the excited states. The established excitation conditions of the observed modes and the simulation of the spectra made it possible to separate the magnetic and electric dipole transitions and to determine the energies of the corresponding states, their symmetry, and the matrix elements of the transitions. Low-frequency lines that do not fit into the established picture of the electron states of Ho3+ were also found; these lines, apparently, correspond to the ions with the distorted by defects local symmetry of the crystal field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzmenko A. M., Ivanov V. Yu., Tikhanovskii A. Yu. A. Yu., Pimenov A., Shuvaev A., Gudim I. A., Mukhin A. A.
Заглавие : Terahertz spectroscopy of magnetoelectric HoAl3(BO3)4
Колич.характеристики :6 с
Место публикации : Opt. Spectrosc. - 2022. - Vol. 130, Is. 1. - P.54-59. - ISSN 0030400X (ISSN), DOI 10.21883/EOS.2022.01.52987.33-21. - ISSN 15626911 (eISSN)
Примечания : Cited References: 18. - This study was partially financially supported by the Russian Science Foundation (project 16-12-10531)
Аннотация: Experimental and theoretical study of submillimeter (terahertz) spectroscopic and magnetic properties of the rare-earth aluminum borate HoAl3(BO3)4 were performed at temperatures 3–300 K. In the transmittance spectra a number of resonance lines were detected at frequencies 2–35 cm-1 for different radiation polarizations. These modes were identified as transitions between the lower levels of the ground multiplet of the Ho3+ ion split by the crystal field, including both transitions from the ground state to the excited ones and transitions between the excited states. The established excitation conditions of the observed modes and the simulation of the spectra made it possible to separate the magnetic and electric dipole transitions and to determine the energies of the corresponding states, their symmetry, and the matrix elements of the transitions. Low-frequency lines that do not fit into the established picture of the electron states of Ho3+ were also found; these lines, apparently, correspond to the ions with the distorted by defects local symmetry of the crystal field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kobyakov A. V., Turpanov I. A., Patrin G. S., Rudenko R. Yu., Yushkov V. I., Kosyrev N. N.
Заглавие : Synthesis, Structure, and Magnetic Properties of an Al2O3/Ge-p/Al2O3/Co Thin-Film System
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 7. - P.864-865. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873819070220
Примечания : Cited References: 5. - This work was supported by the Russian Foundation for Basic Research, project no. 18-02-00161-а.
Аннотация: Structural and magnetic measurements are made of an Al2O3/Ge-p/Al2O3/Co thin-film system. The structure is synthesized via ion-plasma deposition and can be used as a tunnel heterostructure. The dependences of the magnetic properties of cobalt on the rate of its deposition and the rates of deposition of preceding layers are established. © 2019, Allerton Press, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhanova A., Boyandin A. N., Ertiletskaya N., Simunin M., Shalygina T., Voronin A., Vasiliev A. D., Nemtsev I., Volochaev M. N., Pyatina S.
Заглавие : Study of the effect of modified aluminum oxide nanofibers on the properties of PLA-based films
Место публикации : Materials. - 2022. - Vol. 15, Is. 17. - Ст.6097. - ISSN 19961944 (ISSN), DOI 10.3390/ma15176097
Примечания : Cited References: 37. - This research was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation for the implementation of the project “Development of multifunctional smart materials and structures based on modified polymer composite materials capable to function in extreme conditions” (project number FEFE-2020-0015)
Аннотация: To find out whether Al2O3 nanofiller is effective in improving the characteristics of polymer composites, composite polymer films based on biodegradable polylactide and epoxidized aluminum oxide nanofibers were obtained by solution casting. Surface morphology, mechanical and thermal properties of composites were studied by SEM, IR-Fourier spectroscopy, DSC and DMA. It was shown that, below and above the percolation threshold, the properties of the films differ significantly. The inclusion of alumina nanoparticles up to 0.2% leads to a plasticizing effect, a decrease in the crystallization temperature and the melting enthalpy and an increase in the tensile stress. An increase in the content of alumina nanoparticles in films above the percolation threshold (0.5%) leads to a decrease in the crystallinity of the films, an increase in stiffness and a drop in elasticity. Finding the percolation threshold of alumina nanoparticles in PLA films makes it possible to control their properties and create materials for various applications. The results of this study may have major significance for the commercial use of aluminum oxide nanofibers and can broaden the research field of composites.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tambasov I. A., Volochaev M. N., Voronin A. S., Evsevskaya N. P., Masyugin A. N., Aleksandrovskii A. S., Smolyarova T. E., Nemtsev I. V., Lyashchenko S. A., Bondarenko G. N., Tambasova E. V.
Заглавие : Structural, Optical, and Thermoelectric Properties of the ZnO:Al Films Synthesized by Atomic Layer Deposition
Место публикации : Phys. Solid State. - 2019. - Vol. 61, Is. 10. - P.1904-1909. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783419100354
Примечания : Cited References: 33. - This study was supported by the Russian Science Foundation, project no. 17-72-10079.
Аннотация: Aluminum-doped zinc oxide thin films have been grown by atomic layer deposition at a temperature of 200°C. Using X-ray diffraction, it has been established that the ZnO:Al thin films exhibits the reflections from the (100), (002), (110), and (201) ZnO hexagonal phase planes. The (101) and (102) planes have also been detected by electron diffraction. The ZnO:Al thin films grow smooth with a root-mean-square roughness of Rq = 0.33 nm and characteristic nanocrystallite sizes of ~70 and ~15 nm without additional aluminum or aluminum oxide phases. The transmission at a wavelength of 550 nm with regard to the substrate has been found to be 96%. The refractive indices and absorption coefficients of the ZnO:Al thin films in the wavelength range of 250–900 nm have been determined. The maximum refractive indices and absorption coefficients have been found to be 2.09 at a wavelength of 335 nm and 0.39 at a wavelength of 295 nm, respectively. The optical band gap is 3.56 eV. The resistivity, Seebeck coefficient, and power factor of the ZnO:Al thin films are ∼1.02 × 10–3 Ω cm, –60 μV/K, and 340 μW m–1 K–2 at room temperature, respectively. The maximum power factor attains 620 μW m–1 K–2 at a temperature of 200°C.
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