Главная
Авторизация
Фамилия
Пароль
Регистрация
Библиотека института физики им. Л.В. Киренского СО РАН
Базы данных
Труды сотрудников ИФ СО РАН - результаты поиска
Вид поиска
Каталог книг и брошюр библиотеки ИФ СО РАН
Каталог журналов библиотеки ИФ СО РАН
Труды сотрудников ИФ СО РАН
Область поиска
Ключевые слова
Автор
Заглавие
Год издания
Место работы автора
в найденном
Найдено в других БД:
Каталог книг и брошюр библиотеки ИФ СО РАН (3)
Формат представления найденных документов:
полный
информационный
краткий
Отсортировать найденные документы по:
автору
заглавию
году издания
типу документа
Поисковый запрос:
(<.>K=gallium<.>)
Общее количество найденных документов
:
30
Показаны документы
с 1 по 20
1.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Petrakovskii G. A., Aleksandrov K. S., Aplesnin S. S., Roessli B., Semadeni F., Amato A., Baines C., Bartolome J., Evangelisti M.
Заглавие
: Spin-glass state in CuGa2O4
Место публикации
: Phys. Rev. B. - 2001. - Vol. 63, Is. 18. - Ст.184425. - ISSN 0163-1829,
DOI
10.1103/PhysRevB.63.184425
Примечания
: Cited References: 28
Предметные рубрики:
TRANSITION
Ключевые слова
(''Своб.индексиров.''): copper--
gallium
--glass--oxygen--acceleration--article--magnetism--measurement--molecular dynamics--phase transition
Аннотация:
Magnetic susceptibility, magnetization, specific-heat, and positive muon spin relaxation (?SR) measurements have been used to characterize the magnetic ground state of the spinel compound CuGa2O4. We observe a spin-glass transition of the S = 1/2 Cu2+ spins below Tf = 2.5 K characterized by a cusp in the susceptibility curve which is suppressed when a magnetic field is applied. We show that the magnetization of CuGa2O4 depends on the magnetic history of the sample. Well below Tf, the muon signal resembles the dynamical Kubo-Toyabe expression reflecting that the spin freezing process in CuGa2O4 results in a Gaussian distribution of the magnetic moments. By means of Monte Carlo simulations, we obtain the relevant exchange integrals between the Cu2+ spins in this compound.
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
2.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kaminskii A. A., Butashin A. V., Aleksandrov K. S., Bezmaternykh L. N., Temerov V. L., Kravtsov N. V., Firsov V. V., Seo D. T., Hommerich U., Temple D., Braud A.
Заглавие
: Gd3Ga5O12:Nd3+ crystals for a continuous-wave diode-pumped laser operating in 4F3/2 4I11/2 and 4F3/2 4I13/2 channels
Место публикации
: Crystallogr. Rep. - 2002. - Vol. 47, Is. 2. - P.308-312. - ISSN 1063-7745,
DOI
10.1134/1.1466508
Примечания
: Cited References: 15
Предметные рубрики:
GALLIUM
GARNET
EMISSION
Ключевые слова
(''Своб.индексиров.''): gadolinium--
gallium
--neodymium--article--concentration response--crystal--pump--spectroscopy--x ray--x ray topography
Аннотация:
Garnet crystals of the composition Gd3Ga5O12:Nd3+ (concentration series CNd = 1-10 at. %) were grown from flux. In terms of spectroscopy, these crystals, unlike those grown from melts, form a medium with a single activator center. For the first time, continuous-wave lasing was excited by diode pumping with the use of Gd3Ga5O12:Nd3+ crystals at the wavelengths ?3 = 1.3315 and ?4 = 1.3370 ?m of the 4F3/2 4I13/2 channel and also the simultaneous generation at two wavelengths, ?1 = 1.0621 and ?2 = 1.0600 ?m, of the 4F3/2 4I11/2 channel. В© 2002 MAIK "Nauka/Interperiodica".
Scopus
,
Читать в сети ИФ
Найти похожие
3.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Aleksandrov K. S., Sorokin B. P., Turchin P. P., Burkov S. I., Glushkov D. A., Karpovich A. A.
Заглавие
: Effects of static electric field and of mechanical pressure on surface acoustic waves propagation in La3Ga5SiO14 piezoelectric single crystals
Коллективы
: IEEE International Ultrasonics Symposium
Место публикации
: Proc IEEE Ultrason Symp. - 1995. - Vol. 1. - P.409-412. - ISBN 1051-0117
Ключевые слова
(''Своб.индексиров.''): electric field effects--electrostriction--lanthanum compounds--piezoelectric materials--piezoelectricity--pressure effects--quartz--single crystals--tensors--bulk acoustic wave--dielectric permeability--electromechanical bond coefficients--lanthanum
gallium
silicide--mechanical pressure--nonlinear electromechanical properties--nonlinear piezoelectric effect--piezoquartz--static electric field--tensorial components--ultrasonic propagation
Аннотация:
The complete set of tensorial components of linear and nonlinear electromechanical properties for La3Ga5SiO14 piezoelectric crystals have been obtained. These data were used for the analysis of influence of static electrical field and of uniaxial homogeneous mechanical pressure on the propagation of surface acoustic waves.
Scopus
Найти похожие
4.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Vorotynov A. M., Pankrats A. I., Abramova G. M., Velikanov D. A., Bovina A. F., Sokolov V. V., Filatova I. Y.
Заглавие
: Magnetic resonance in a
gallium
-doped Cu–Cr–S structure
Место публикации
: Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 4. - P.678-681. - ISSN 10637834 (ISSN),
DOI
10.1134/S1063783416040314
Примечания
: Cited References: 9
Предметные рубрики:
Ferromagnetic spinels
Аннотация:
A layered Cu–Cr–S structure doped with Ga ions and consisting of single-crystal CuCrS2 layers, embedded with thin plates of spinel phases CuCr2S4 and CuGaxCr2–xS4, has been studied using the magnetic resonance and magnetic susceptibility methods. The Curie temperature and the saturation magnetization of the spinel phases of the samples have been determined. The spinel phase layer thickness has been estimated. © 2016, Pleiades Publishing, Ltd.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
5.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Mankov Y. I., Tsikalov D. S.
Заглавие
: High-Frequency Susceptibility of a Superlattice with 2D Inhomogeneities
Коллективы
:
Разночтения заглавия
:авие SCOPUS: High-frequency susceptibility of a superlattice with 2D inhomogeneities
Место публикации
: J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 107, Is. 4. - P603-611. - ISSN 1063-7761,
DOI
10.1134/S1063776108100075
Примечания
: Cited References: 26. - This work was supported in part by grant no. 3818.2008.3 from the President of Russia in accordance with the program supporting leading scientific schools.
Предметные рубрики:
SPIN-WAVE SUSCEPTIBILITY
PERIODIC MULTILAYERS
LOCALIZATION
SYSTEMS
SPECTRUM
DISORDER
MEDIA
Ключевые слова
(''Своб.индексиров.''): energy conservation--energy gap--energy management--frequency bands--
gallium
alloys--green's function--probability density function--three dimensional--band gaps--energy conservation laws--green functions--high frequencies--imaginary parts--magnon crystals--scattered waves--superlattice layers--wave spectrums--phase interfaces
Аннотация:
We investigate the high-frequency susceptibility (Green function) of an initially sinusoidal 1D superlattice with 2D phase inhomogeneities that model the deformations of the interfaces between the superlattice layers. For waves propagating along the superlattice axis ( the geometry of a photon or magnon crystal), we have found a peculiar behavior of the imaginary part of the Green function that consists in a significant difference between the peaks corresponding to the edges of the band gap in the wave spectrum. The peak corresponding to the lower-frequency band edge remains essentially unchanged as the root-mean-square fluctuation of the 2D inhomogeneities. 2 increases, while the peak corresponding to the higher-frequency band edge broaden and decreases sharply in height until its complete disappearance with increasing gamma(2). This behavior of the peaks corresponds to a band gap closure mechanism that differs from the traditional one characteristic of 1D and 3D inhomogeneities. These effects can be explained by a peculiarity of the energy conservation laws for the incident and scattered waves for 2D inhomogeneities in a 1D superlattice.
WOS
,
Scopus
,
Читать в сети ИФ
Найти похожие
6.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Aleksandrovsky A. S., Arkhipkin V. G., Bezmaternykh L. N., Gudim I. A., Krylov A. S., Vagizov F.
Заглавие
: Origin of color centers in the flux-grown europium
gallium
garnet
Место публикации
: J. Appl. Phys.: AMER INST PHYSICS, 2008. - Vol. 103, Is. 8. - Ст.83102. - ISSN 0021-8979,
DOI
10.1063/1.2902365
Примечания
: Cited References: 7
Предметные рубрики:
SPECTRA
IONS
Ключевые слова
(''Своб.индексиров.''): absorption--europium alloys--garnets--ultraviolet radiation--calcium-free flux--flux-grown europium
gallium
garnet--color centers
Аннотация:
Europium
gallium
garnet (EuGG) single crystals were grown from fluxes with various contents. Optical absorption spectra of EuGG grown from a flux containing calcium show an additional band in the ultraviolet and blue regions of the spectra as compared to the case of a calcium-free flux. Mossbauer spectra of the samples grown from the fluxes with different additives show no signs of other valence states of the europium ions except for 3+. However, they indicate changes in the crystal field due to the entrance of additive ions. The nature of the additional absorption must be the same as that for calcium-doped gadolinium
gallium
garnet, i.e., anion vacancies. Mossbauer isotope shifts and quadrupole splitting for EuGG are determined. (C) 2008 American Institute of Physics.
WOS
,
Scopus
,
Читать в сети ИФ
Найти похожие
7.
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.
WOS
,
Scopus
,
Читать в сети ИФ
Найти похожие
8.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Jiang C., Brik M. G., Li L., Li L., Peng J., Wu J., Molokeev M. S., Wong K. -L., Peng M.
Заглавие
: The electronic and optical properties of a narrow-band red-emitting nanophosphor K2NaGaF6:Mn4+ for warm white light-emitting diodes
Место публикации
: J. Mater. Chem. C. - 2018. - Vol. 6, Is. 12. - P.3016-3025. - ISSN 20507534 (ISSN),
DOI
10.1039/c7tc05098d
Примечания
: Cited References: 55. - We acknowledge the financial support received from the Program for Innovative Research Team in University of Ministry of Education of China (Grant No. IRT_17R38), the Key Program of Guangzhou Scientific Research Special Project (Grant No. 201607020009), the National Natural Science Foundation of China (Grant No. 51672085, 51322208, 3160440), and the Fundamental Research Funds for the Central Universities. M. G. Brik acknowledges the supports received from the Recruitment Program of High-end Foreign Experts (Grant No. GDW20145200225), the Programme for the Foreign Experts offered by Chongqing University of Posts and Telecommunications, Ministry of Education and Research of Estonia, (Project PUT430) and European Regional Development Fund (Project TK141), and the Guest Professorship at Kyoto University (Prof. S. Tanabe laboratory). The first-principles calculations were carried out using the resources provided by the Wroclaw centre for Networking and Supercomputing (http://wcss.pl; Grant No. WCSS#10117290).
Ключевые слова
(''Своб.индексиров.''): energy efficiency--
gallium
compounds--light emission--light emitting diodes--manganese--manganese compounds--optical properties--phosphors--precipitation (chemical)--quenching--rietveld refinement--sodium compounds
Аннотация:
Recently, as a key red component in the development of warm white light-emitting diodes (WLEDs), Recently, as a key red component in the development of warm white light-emitting diodes (WLEDs), Mn4+-doped fluorides with narrow red emission have sparked rapidly growing interest because they improve color rendition and enhance the visual energy efficiency. Herein, a red nanophosphor, K2NaGaF6:Mn4+, with a diameter of 150-250 nm has been synthesized using a simple co-precipitation method. Rietveld refinement reveals that it crystallizes in the space group Fm3m with the cell parameter a = 8.25320(4) Å. The exchange charge model (ECM) has been used to calculate the energy levels of Mn4+ ions in K2NaGaF6, which match well with the experimental spectra. The as-synthesized phosphor exhibits a narrow red emission at around 630 nm (spin-forbidden 2Eg → 4A2 transition of Mn4+ ions) when excited at 365 nm (4A2g → 4T1g) and 467 nm (4A2g → 4T2g), with a quantum efficiency (QE) of 61% and good resistance to thermal quenching. Based on the structure, the formation mechanism of ZPL has been discussed. In addition, the concentration-dependent decay curves of Mn4+ in K2NaGaF6 were fitted using the Inokuti-Hirayama model, suggesting that the dipole-dipole interactions determine the concentration quenching. Finally, encouraged by the good performance, a warm LED with a CRI of 89.4 and CCT of 3779 K was fabricated by employing the title nanophosphor as the red component. Our findings suggest that K2NaGaF6:Mn4+ can be a viable candidate for the red phosphor used in warm WLEDs.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
9.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Pavlov E. A., Chuprov I. V., Nikulin M. V., Mal'tsev E. V., Pshenichnaya A. A., Grigoreva T. F., Pastukhov E. A., Skuratov A. P., Lyakhov N. Z.
Заглавие
: Mechanochemical synthesis of intermetallic compounds in the
gallium
-iridium system
Место публикации
: Russ. Metall. - 2018. - Is. 8. - P.728-732. - ISSN 0036-0295,
DOI
10.1134/S0036029518080141. - ISSN 1555-6255(eISSN)
Примечания
: Cited References: 18. - This work was performed in terms of project no. 1622/17 of the Krasnoyarsk Plant of Nonferrous Metals and the Institute of Solid State Chemistry and Mechanochemistry.
Предметные рубрики:
ALUMINUM
Ключевые слова
(''Своб.индексиров.''): mechanochemical synthesis--intermetallic compounds--
gallium
--iridium--complex compounds of iridium
Аннотация:
The interaction between a solid inert metal (Ir) and an active liquid metal (Ga) during mechanical activation in a high-energy planetary mill is studied by X-ray diffraction and scanning electron microscopy with EDS-apparatus for high-resolution energy dispersive X-ray microanalysis. The influence of mechanical activation conditions on the formation of GaxIry intermetallic compounds and GaxIry/Ir composites and on their solubility in various acids is investigated. Being a surfactant for iridium,
gallium
propagates along the grain boundaries of polycrystalline iridium particles during mechanical activaiton and, hence, sharply decreases their strength. As a result of strong mechanical deformation during activation, the contact surface area between the solid and liquid metals, where the intermetallic compounds form intensely, increases sharply. As a result of treatment of the products of mechanical activaiton by a mixture of concentrated hydrochloric and nitric acids, iridium (30%) from passes into an acid solution and forms HxIrCly complex compounds, which can interact with bases to form soluble complex salts.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
10.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Eremina R. M., Moshkina E. M., Gavrilova T. P., Gilmutdinov I. F., Sofronova S. N., Kiiamov A. G.
Заглавие
: Investigation of the Magnetic Properties of Ludwigites
Место публикации
: Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 7. - P.912-914. - ISSN 10628738 (ISSN),
DOI
10.3103/S1062873819070141
Примечания
: Cited References: 6. - This work was supported by the Russian Foundation for Basic Research, project no. 17-02-00953.
Аннотация:
Single crystals of Cu2AlBO5 and Cu2GaBO5 copper oxyborates are synthesized via solution-melt crystallization and subjected to X-ray diffraction analysis. Parameters of the crystal lattice and the positions of atoms in a unit cell are determined. Copper ions form a structural chain along axis а in Cu2AlBO5 and Cu2GaBO5. Temperature dependences of the magnetic susceptibility are measured. The obtained curves feature kinks at Т = 2.4 (Cu2AlBO5) and 4.1 K (Cu2GaBO5). © 2019, Allerton Press, Inc.
Смотреть статью
,
Scopus
,
Читать в клокальной сети ИФ
Найти похожие
11.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Qiao J., Amachraa M., Molokeev M. S., Chuang Y. -C., Ong S. P., Zhang Q., Xia Z.
Заглавие
: Engineering of K3YSi2O7 to Tune Photoluminescence with Selected Activators and Site Occupancy
Место публикации
: Chem. Mater. - 2019. - Vol. 31, Is. 18. - P.7770-7778. - ISSN 08974756 (ISSN),
DOI
10.1021/acs.chemmater.9b02990
Примечания
: Cited References: 48. - This work was supported by the National Natural Science Foundation of China (Nos. 51722202, 51972118 and 51572023), Natural Science Foundations of Beijing (2172036), Fundamental Research Funds for the Central Universities (FRF-TP-18-002C1), and Guangdong Provincial Science & Technology Project (2018A050506004). This work was also supported by the National Science Foundation, Ceramics Program (No. 1911372), and the computational resources were provided by the Extreme Science and Engineering Discovery Environment (XSEDE) supported by the National Science Foundation (No. ACI-1548562).
Аннотация:
The luminescence of rare earth ions (Eu2+, Ce3+, and Eu3+)-doped inorganic solids is attractive for the screening of phosphors applied in solid-state lighting and displays and significant to probe the occupied crystallographic sites in the lattice also offering new routes to photoluminescence tuning. Here, we report on the discovery of the Eu- and Ce-activated K3YSi2O7 phosphors. K3YSi2O7:Eu is effectively excited by 450 nm InGaN blue light-emitting diodes (LEDs) and displays an orange-red emission originated from characteristic transitions of both Eu2+ and Eu3+, while K3YSi2O7:Ce3+ shows green emission upon 394 nm near-ultraviolet (NUV) light excitation. Rietveld refinement verifies the successful doping of the activators, and density functional theory (DFT) calculations further support that Eu2+ occupies both K1 and Y2 crystallographic sites, while Ce3+ and Eu3+ only occupy the Y2 site; hence, the broad-band red emission of Eu2+ are attributed to a small DFT band gap (3.69 eV) of K3YSi2O7 host and a selective occupancy of Eu2+ in a highly distorted K1 site and a high crystal field splitting around Y2 sites. The white LEDs device utilizing orange-red-emitting K3YSi2O7:Eu and green-emitting K3YSi2O7:Ce3+ exhibits an excellent CRI of 90.1 at a correlated color temperature of 4523 K. Our work aims at bridging multivalent Eu2+/Eu3+ and Ce3+ site occupancy in the same host to realize photoluminescence tuning and especially exposes new ways to explore new phosphors with multicolor emission pumped by blue and NUV light for white LEDs.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
12.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Hu T., Molokeev M. S., Xia Z., Zhang Q.
Заглавие
: Aliovalent substitution toward reinforced structural rigidity in Ce3+-doped garnet phosphors featuring improved performance
Место публикации
: J. Mater. Chem. C. - 2019. - Vol. 7, Is. 46. - P.14594-14600. - ISSN 20507534 (ISSN),
DOI
10.1039/c9tc05354a
Примечания
: Cited References: 38. - This work was supported by the National Natural Science Foundation of China (No. 51722202 and 51972118), the Guangdong Provincial Science & Technology Project (2018A050506004) and the Fundamental Research Funds for the Central Universities (D2190980).
Аннотация:
Highly efficient phosphors with thermal stability and color-tunable emission are required for the fabrication of phosphor-converted white light-emitting diodes (pc-WLEDs). Currently developed engineering strategies are generally successful in photoluminescence tuning but, unfortunately, suffer severe deterioration in emission intensity/efficiency and/or thermal stability. Herein, an efficient aliovalent substitution strategy toward reinforced structural rigidity is proposed and demonstrated experimentally. By incorporating Be2+ ion into the garnet-type Lu2SrAl4SiO12:Ce3+ phosphor, the phosphor shows enhanced internal/external quantum efficiency, from 79.2%/26.7% to 84.5%/32.9%, photoluminescence tuning from green (peaking at ∼512 nm) to yellow (peaking at ∼552 nm), and zero thermal quenching, even up to 200 °C. The Be2+ substitution at the Al2/Si2 site enables stable and rigid local surroundings around the Ce3+ activator, which is responsible for the unprecedented performance. In addition, high-quality warm WLED devices with a luminous efficiency of 158.1 lm W-1, correlated color temperature of 3858 K and high color rendering index of 81.7, are obtained by combining Lu2SrAl4SiO12:Ce3+,Be2+ as the yellow emitter, CaAlSiN3:Eu2+ as the red emitter and a blue-emitting InGaN chip. These findings highlight a new strategy for performance optimization of LED phosphors by selecting rigid covalent compounds with further reinforced structural rigidity via aliovalent substitution.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
13.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Moshkina E. M., Krylova S. N., Gudim I. A., Molokeev M. S., Temerov V. L., Pavlovskiy M. S., Vtyurin A. N., Krylov A. S.
Заглавие
:
Gallium
composition-dependent structural phase transitions in HoFe3-xGax(BO3)4 solid solutions: crystal growth, structure, and Raman spectroscopy study
Место публикации
: Cryst. Growth Des. - 2020. - Vol. 20, Is. 2. - P.1058-1069. - ISSN 15287483 (ISSN),
DOI
10.1021/acs.cgd.9b01387
Примечания
: Cited References: 30. - The reported study was funded by the Russian Foundation for Basic Research No. 18-02-00754. The experiments were performed using equipment of Center for Common Use, Krasnoyarsk Scientific Center, FSC SB RAS
Аннотация:
Single crystals of solid solutions of HoFe3–xGax(BO3)4 with x = 0, 0.5, 1, 1.5, and 3 were obtained using flux synthesis. The conditions of the synthesis are described in detail. The structural properties of each of the synthesized samples were studied using X-ray powder diffraction analysis at several temperature points (303, 403, and 503 K). The structural parameters of the obtained samples and the “pure” compounds HoFe3(BO3)4 and HoGa3(BO3)4 were compared. The Raman spectra of the obtained solid solutions HoFe3–xGax(BO3)4 were studied in a wide temperature range (T = 10–400 K). The vibrational spectra and eigenvectors of the HoFe3Ga(BO3)4 and HoGa3(BO3)4 in R32 phase and HoFe3Ga(BO3)4 in P3121 phase were calculated within density functional theory. The features of the Raman spectra of HoFe2Ga(BO3)4, HoFe2.5Ga0.5(BO3)4, HoFe3(BO3)4 crystals associated with the R32 → P3121 structural phase transition, which have a strong dependence on the degree of substitution x, were investigated. Peculiarities of the Raman spectra, which are associated with magnetic ordering in HoFe1.5Ga1.5(BO3)4, HoFe2Ga(BO3)4, and HoFe2.5Ga0.5(BO3)4 crystals, were detected.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
14.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Denisova L. T., Molokeev M. S., Irtyugo L. A., Beletskii V. V., Belousova N. V., Denisov V. M.
Заглавие
: Structure and thermodynamic properties of the SmGaGe2O7 oxide
Место публикации
: Phys. Solid State. - 2020. - Vol. 62, Is. 2. - P.384-387. - ISSN 10637834 (ISSN),
DOI
10.1134/S1063783420020109
Примечания
: Cited References: 10. - This study was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation to the Siberian Federal University in 2017–2019, project no. 4.8083.2017/8.9 “Formation of a Data Bank of Thermodynamic Characteristics of the Complex-Oxide Multifunctional Materials Containing Rare and Scattered Elements.”
Аннотация:
The SmGaGe2O7 oxide material has been obtained from initial Sm2O3, Ga2O3, and GeO2 oxides by solid-phase synthesis with annealing in air in the temperature range of 1273–1473 K. The structure of the investigated germanate (sp. gr. P21/c, a = 7.18610(9) Å, b = 6.57935(8) Å, and c = 12.7932(2) Å) has been established by X-ray diffraction and the high-temperature heat capacity has been determined by differential scanning calorimetry. Using the experimental data on Cp = f(T), the thermodynamic properties of the compound have been calculated.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
15.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Denisova L. T., Molokeev M. S., Irtyugo L. A., Beletskii V. V., Kargin, Yu. F., Denisov V. M.
Заглавие
: Synthesis, structure, and thermophysical properties of EuGaGe2O7
Место публикации
: Inorg. Mater. - 2020. - Vol. 56, Is. 8. - P.854-858. - ISSN 0020-1685,
DOI
10.1134/S002016852008004X. - ISSN 1608-3172(eISSN)
Примечания
: Cited References: 18
Предметные рубрики:
TEMPERATURE HEAT-CAPACITY
THERMODYNAMIC PROPERTIES
CRYSTAL-STRUCTURE
Аннотация:
The europium
gallium
germanate EuGaGe2O7 has been prepared by solid-state reaction in air in the temperature range 1273–1473 K using a stoichiometric mixture of Eu2O3, Ga2O3, and GeO2. Its crystal structure has been determined by X-ray diffraction (sp. gr. P21/c, a = 7.1693(7) Å, b = 6.57008(6) Å, c = 12.7699(1) Å, β = 117.4522(5)°, V = 533.768(8) Å3). The heat capacity of polycrystalline samples has been determined by differential scanning calorimetry in the temperature range 350–1053 K and the experimental data have been used to calculate the thermodynamic properties (enthalpy increment, entropy change, and reduced Gibbs energy change) of EuGaGe2O7.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
16.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Denisova L. T., Molokeev M. S., Chumilina L. G., Kargin Y. F., Denisov V. M., Ryabov V. V.
Заглавие
: Synthesis, Crystal Structure and Thermodynamic Properties of LuGaTi2O7
Место публикации
: Inorg. Mater. - 2020. - Vol. 56, Is. 12. - P.1242-1247. - ISSN 00201685 (ISSN),
DOI
10.1134/S0020168520120055
Примечания
: Cited References: 25
Аннотация:
Single-phase LuGaTi2O7 samples have been prepared by solid-state reaction in a starting mixture of Lu2O3, Ga2O3, and TiO2 via sequential firing in air at temperatures of 1273 and 1573 K. The crystal structure of the lutetium
gallium
dititanate has been determined by the Rietveld method (profile analysis of X-ray diffraction patterns of polycrystalline powders): sp. gr. Pcnb; a = 9.75033(13) Å, b = 13.41425(17) Å, c = 7.29215(9) Å, V = 957.32(2) Å3, d = 6.28 g/cm3. The heat capacity of LuGaTi2O7 has been determined as a function of temperature by differential scanning calorimetry in the range 320–1000 K. The Cp(T) data thus obtained have been used to calculate the principal thermodynamic functions of the oxide compound.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
17.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Aplesnin S. S., Masyugin A. N., Volochaev M. N., Ishibashi T.
Заглавие
: Coexistence of the electric polarization and conductive current in the bismuth–neodymium ferrite garnet films
Место публикации
: J. Mater. Sci. Mater. Electron. - 2021. - Vol. 32. - P.3766-3781. - ISSN 09574522 (ISSN),
DOI
10.1007/s10854-020-05121-9
Примечания
: Cited References: 42
Аннотация:
The Nd1Bi2Fe5O12/Nd2Bi1Fe4Ga1O12 polycrystalline films on the glass substrate and the Nd0.5Bi2.5Fe5O12 epitaxial films on the single-crystal gadolinium
gallium
garnet substrate have been investigated by impedance and dielectric spectroscopy. The inductive contribution to the impedance and two relaxation channels related to ferroelectric domains and migration polarization have been established. The magnetocapacitance and magnetoimpedance have been determined. The conductive and polarization currents and the phase difference between them for the films of two types have been determined. The critical temperatures of the polarization disappearance and hysteresis I–V have been found. A model of the polarization caused by the piezoelectric effect and flexoelectric interaction has been proposed. I–V hysteresis is explained by the presence of ferroelectric domains near the interface and is associated with the hysteresis of the electric polarization.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
18.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kulbakov A. A., Sarkar R., Janson O., Dengre S., Weinhold T., Moshkina E. M., Portnichenko P. Y., Luetkens H., Yokaichiya F., Sukhanov A. S., Eremina R. M., Schlender P., Schneidewind A., Klauss H. -H., Inosov D. S.
Заглавие
: Destruction of long-range magnetic order in an external magnetic field and the associated spin dynamics in Cu2GaBO5 and Cu2AlBO5 ludwigites
Место публикации
: Phys. Rev. B. - 2021. - Vol. 103, Is. 2. - Ст.024447. - ISSN 24699950 (ISSN),
DOI
10.1103/PhysRevB.103.024447
Примечания
: Cited References: 46. - We thank U. Nitzsche for technical assistance. This project was funded in part by the German Research Foundation (DFG) under Grant IN 209/9-1, via Project C03 of the Collaborative Research Center SFB 1143 (project-id 247310070) at the TU Dresden, and the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter—ct.qmat (EXC 2147, project-id 390858490). O.J. was supported by the Leibniz Association through the Leibniz Competition
Аннотация:
The quantum spin systems Cu2M′BO5 (M′=Al,Ga) with the ludwigite crystal structure consist of a structurally ordered Cu2+ sublattice in the form of three-leg ladders, interpenetrated by a structurally disordered sublattice with a statistically random site occupation by magnetic Cu2+ and nonmagnetic Ga3+ or Al3+ ions. A microscopic analysis based on density-functional-theory calculations for Cu2GaBO5 reveals a frustrated quasi-two-dimensional spin model featuring five inequivalent antiferromagnetic exchanges. A broad low-temperature 11B nuclear magnetic resonance points to a considerable spin disorder in the system. In zero magnetic field, antiferromagnetic order sets in below TN≈4.1 K and ∼2.4 K for the Ga and Al compounds, respectively. From neutron diffraction, we find that the magnetic propagation vector in Cu2GaBO5 is commensurate and lies on the Brillouin-zone boundary in the (H0L) plane, qm=(0.45,0,−0.7), corresponding to a complex noncollinear long-range ordered structure with a large magnetic unit cell. Muon spin relaxation is monotonic, consisting of a fast static component typical for complex noncollinear spin systems and a slow dynamic component originating from the relaxation on low-energy spin fluctuations. Gapless spin dynamics in the form of a diffuse quasielastic peak is also evidenced by inelastic neutron scattering. Most remarkably, application of a magnetic field above 1 T destroys the static long-range order, which is manifested in the gradual broadening of the magnetic Bragg peaks. We argue that such a crossover from a magnetically long-range ordered state to a spin-glass regime may result from orphan spins on the structurally disordered magnetic sublattice, which are polarized in magnetic field and thus act as a tuning knob for field-controlled magnetic disorder.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
19.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Denisova L. T., Molokeev M. S., Ryabov V. V., Kargin Y. F., Chumilina L. G., Denisov V. M.
Заглавие
: Crystal structure and thermodynamic properties of titanate ErGaTi2O7
Место публикации
: Russ. J. Inorg. Chem. - 2021. - Vol. 66, Is. 4. - P.532-537. - ISSN 00360236 (ISSN),
DOI
10.1134/S0036023621040082
Примечания
: Cited References: 29
Аннотация:
Erbium
gallium
titanate was prepared by solid-phase synthesis via the sequential calcination of precursor oxides in an air atmosphere at 1273 and 1573 K. The crystal structure of ErGaTi2O7 was characterized by full-profile analysis for the X-ray diffraction pattern of the synthesized powder sample as follows: space group Pcnb, a = 9.77326(15) Å, b = 13.5170(2) Å, c = 7.33189(11) Å, V = 918.58(3) Å3, ρ = 6.10 g/cm3. The high-temperature heat capacity of erbium
gallium
titanate was measured by differential scanning calorimetry within a temperature range of 320–1000 K. Based on these data, the basic thermodynamic functions of ErGaTi2O7 were calculated.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
20.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Tetelbaum D., Nikolskaya A., Dorokhin M., Vasiliev V., Smolyakov D. A., Lukyanenko A. V., Baron F. A., Tarasov A. S.
Заглавие
: Implanted
gallium
impurity detection in silicon by impedance spectroscopy
Место публикации
: Mater. Lett. - 2022. - Vol. 308, Part B. - Ст.131244. - ISSN 0167577X (ISSN),
DOI
10.1016/j.matlet.2021.131244
Примечания
: Cited References: 11. - This study was supported by the Russian Foundation for Basic Research (grant No. 20-42-243007), Ministry of Science and Higher Education of the Russian Federation (project No. 075-03-2020-191/5), as well as the Government of the Russian Federation within the framework of the Megagrant for the creation of world-class laboratories (No. 075-15-2019-1886)
Аннотация:
The results of determining the energy levels of boron-doped silicon implanted with
gallium
ions by impedance spectroscopy are reported. In the as-implanted sample the boron level remains the same and a second level appears close to the Ga-level reported in literature. In the sample annealed at 1000 °C, two levels are observed neither of which corresponds to the literature values for boron and
gallium
. It is assumed that in the as-implanted sample this method detects levels of
gallium
atoms located at a depth where ions penetrate due to the channeling effect, since a large concentration of defects at shallower depths does not allow detection of energy levels due to the Fermi level pinning. Explaining the results for the sample annealed after implantation requires additional research. The main result of this work is to establish the possibility of detecting impurity levels in ion-implanted silicon by impedance spectroscopy even in the absence of subsequent annealing.
Смотреть статью
,
Scopus
,
WOS
,
Читать в сети ИФ
Найти похожие
полный формат
краткий формат
все найденные
отмеченные
кроме отмеченных
Стандартный
Расширенный
Профессиональный
Распределенный
По словарю
ГРНТИ-навигатор
УДК-навигатор
Тематический навигатор
Другие библиотеки
Центральная Научная Библиотека КНЦ СО РАН
Библиотека института биофизики
Библиотека института химии и химический технологии
Библиотека института вычислительного моделирования
Библиотека института леса
Библиотека СФУ
Краевая научная библиотека
© Международная Ассоциация пользователей и разработчиков электронных библиотек и новых информационных технологий
(Ассоциация ЭБНИТ)