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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kliava J., Edelman I. S., Ivanova O. S., Ivantsov R. D., Bayukov O. A., Petrakovskaja E. A., Zaikovskiy V. I.
Заглавие : Nanostructures based on glasses simultaneously doped with Fe and Mn
Место публикации : Abstracts of Nano South West European Conference, Bordeaux, France, 2008, р. 137
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Наркевич Н. А., Власов И. В., Гоморова Ю. Ф., Сыртанов М. С., Толмачев А. И., Волочаев, Михаил Николаевич
Заглавие : Характер разрушения нержавеющей Cr-Mn-N-стали с наноструктурированными поверхностными слоями при криогенной температуре
Колич.характеристики :9 с
Место публикации : Журн. техн. физ. - 2024. - Т. 94, Вып. 1. - С. 90-98. - ISSN 00444642 (ISSN), DOI 10.61011/JTF.2024.01.56906.96-23. - ISSN 1726748X (eISSN)
Примечания : Библиогр.: 35. - Работа выполнена при финансовой поддержке Российского научного фонда (грант № 22-29-00438)
Аннотация: Исследовано влияние деформационной обработки поверхности нержавеющей аустенитной Cr-Mn-N-стали на ее структуру, механические свойства и характер разрушения при –196°C. В приповерхностном слое после обработки наряду с измельчением структуры отмечено уменьшение параметра решетки аустенита и деформационное старение с образованием частиц CrN и Fe2N. В сравнении с закаленным состоянием после обработки сталь обладает повышенными пределом текучести и скоростью деформационного упрочнения, но сниженной пластичностью и ударной вязкостью. При этом приповерхностный слой разрушается вязко как при испытаниях на растяжение, так и ударном изгибе при –196°C. Вязкому разрушению приповерхностных слоев способствует снижение внутренних напряжений, связанное с выходом азота из позиций внедрения и образованием нитридов.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ming H., Zhou Ya., Molokeev M. S., Zhang Ch., Huang L., Wang Yu., Sun H.-T., Song E., Zhang Q.
Заглавие : Machine-learning-driven discovery of Mn4+-doped red-emitting fluorides with short excited-state lifetime and high efficiency for mini light-emitting dIode displays
Колич.характеристики :11 с
Место публикации : ACS Mater. Lett. - 2024. - Vol. 6. - P.1790-1800. - ISSN 26394979 (eISSN), DOI 10.1021/acsmaterialslett.4c00263
Примечания : Cited References: 39. - This work was financially supported by the National Key Research and Development Program of China (No. 2022YFB3503800), National Natural Science Foundation of China (Grants Nos. 52202170 and 52322208), Natural Science Foundation of Guangdong Province (No. 2022A1515140032) and Distinguished Youth Foundation of Guangdong Scientific Committee (No. 2023B1515020059). This work was also supported by the Tyumen Oblast Government, as part of the West-Siberian Interregional Science and Education Center’s Project No. 89-DON (3). H. Ming acknowledges the fellowship support from the China Scholarship Council (CSC No. 202206150038)
Аннотация: The discovery of high-efficiency Mn4+-activated fluoride red phosphors with short excited-state lifetimes (ESLs) is urgent and crucial for high-quality, wide-color-gamut display applications. However, it is still a great challenge to design target phosphors with both short ESL and high luminescence efficiency. Herein, we propose an efficient machine learning approach based on a small dataset to establish the ESL prediction model, thereby facilitating the discovery of new Mn4+-activated fluorides with short ESLs. Such a model can not only accurately predict the ESLs of Mn4+ in fluorides but also quantify the impact of structure features on ESLs, therefore elucidating the “structure-lifetime” correlations. Guided by the correlations, two new Mn4+-doped tetramethylammonium (TMA)-based hybrid fluorides (TMA)2BF6:Mn4+ (B = Sn or Hf) with both short ESLs (τ ≤ 3.7 ms) and high quantum efficiencies (internal QEs ˃ 92%, external QEs ˃ 55%) have been discovered successfully. A prototype displayer with excellent performance (∼124% National Television Standards Committee (NTSC) color gamut) is assembled by employing a (TMA)2SnF6:Mn4+-based white Mini-LED backlight module, demonstrating its practical prospects in high-quality displays. This work not only brings promising candidates for Mn4+-doped fluoride phosphors but also provides a valuable reference for accelerating the discovery of new promising phosphors.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov D. V., Gavrilova T. P., Cherosov M. A., Shustov V. A., Moshkina E. M., Fazlizhanov I. I., Eremina R. M.
Заглавие : Magnetism and specific heat of ludwigites Mn1.17Co1.83BO5 and Mn1.39Co1.61BO5
Колич.характеристики :10 с
Место публикации : J. Alloys Compd. - 2024. - Vol. 976. - Ст.173143. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2023.173143. - ISSN 18734669 (eISSN)
Примечания : Cited References: 34. - This research was supported by the Russian Science Foundation (Project No. 23-72-00047). The work of T.P. Gavrilova and D.V. Popov on the specific heat approximation had the financial support from the government assignment for FRC Kazan Scientific Center of RAS. The work of M.A. Cherosov on the measurements of specific heat has been supported by the Kazan Federal University Strategic Academic Leadership Program (PRIORITY-2030)
Аннотация: Mn1.17Co1.83BO5 and Mn1.39Co1.61BO5 ludwigites were synthesized by the flux technique and investigated by means of X-ray diffraction, X-ray fluorescence, DC and AC magnetic susceptibility, and specific heat analysis. The crystal structure of both ludwigites belongs to the Pbam space group with a = 9.25 Å, b = 12.41 Å, and c = 3.05 Å for Mn1.17Co1.83BO5 and a = 9.27 Å, b = 12.45 Å, and c = 3.05 Å for Mn1.39Co1.61BO5. The simultaneously observed negative values of the Curie-Weiss temperatures and ferromagnetic-type hysteresis loops allow us to assume that the ferrimagnetic ordering is realized in Mn1.39Co1.61BO5 below TF = 60.8 K, while in Mn1.17Co1.83BO5 in addition to the above mentioned experimental facts the frequency dependencies of the real and imaginary parts of the AC magnetization were observed assuming the presence of the canonical spin-glass state below TSG = 44.5 K. The observed difference in coercive forces of M-H curves at low temperatures can be associated with presence of two spin subsystems for Mn1.17Co1.83BO5.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wang, Yuanjing, Tang, Wenyu, Zhang, Chuang, Molokeev M. S., Ming, Hong, Zhou, Yayun, Peng, Shuai, Song, Enhai, Zhang, Qinyuan
Заглавие : Structure-based machine learning enables discovery of Mn4+-activated red-light fluorides for ultrawide-gamut mini-light-emitting diodes
Колич.характеристики :11 с
Место публикации : Adv. Funct. Mater. - 2024. - Vol. 34, Is. 14. - Ст.2313490. - ISSN 1616301X (ISSN), DOI 10.1002/adfm.202313490. - ISSN 16163028 (eISSN)
Примечания : Cited References: 61. - This research was financially supported by the National Key R& D Program of China (Grant No. 2022YFB3503800) and the National Natural Science Foundation of China (Grant Nos. 52202170 and 52322208). This research was supported by the Tyumen Oblast Government, as part of the West-Siberian Interregional Science and Education Center's project No. 89-DON (3)
Аннотация: Mn4+-activated fluorides with a saturated red color and sharp line emission are ideal for applications in the light-emitting diodes (LEDs) backlight for displays. However, the emissions attributed to 2E→4A2 parity and spin-forbidden transitions limit the design and adjustments of emission wavelength and chromaticity coordinates. Herein, machine learning algorithms are used to build a wavelength-prediction model for Mn4+-activated fluorides. The model precisely identifies the key structural features that affect wavelengths and discovers target materials. The predicted candidate Cs2NaAlF6:Mn4+ (CNAF) with a long-wavelength zero-phonon-line emission at 628 nm exhibits a redshift in comparison with other reported Mn4+-activated fluorides and commercial K2SiF6:Mn4+, but maintains narrow spectral emission with full-width half maximum (FWHM) of 11.2 nm. The redshift and narrow spectra result in a color purity of 99.7% and Commission Internationale de L'Eclairage (CIE) chromaticity coordinate of (0.7032,0.2967) that is close to the pure red-light point of Recommendation BT. 2020 (Rec. 2020). Moreover, CNAF is prepared as a transparent red-light film, and the device fabricated using the blue-light mini-LEDs, green quantum-dot film, and CNAF film exhibits a wide color-gamut of 121.5% National Television Standards Committee (NTSC) or 90.6% Rec. 2020, suggesting that CNAF has potential for wide-color-gamut displays.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Banerjee S., Saikia S., Molokeev M. S., Nag A.
Заглавие : Unveiling temperature-induced structural phase transition and luminescence in Mn2+-doped Cs2NaBiCl6 double perovskite
Колич.характеристики :8 с
Место публикации : Chem. Mater. - 2024. - Vol. 36, Is. 9. - P.4750-4757. - ISSN 08974756 (ISSN), DOI 10.1021/acs.chemmater.4c00514. - ISSN 15205002 (eISSN)
Примечания : Cited References: 49. - Authors acknowledge Dr. Arup Rath’s lab NCL Pune and SAIF-IIT Bombay for diffuse reflectance spectroscopy and ICP-AES measurements, respectively. A.N. acknowledges Science & Engineering Research Board, India, for Swarnajayanti Fellowship (SB/SJF/2020-21/02), and BRICS grant (e-27558) of the Department of Science and Technology, India. Authors acknowledge the Department of Science and Technology India (FIST program, SR/FST/CS-II/2019/105) for temperature-dependent powder XRD and EPR data. S.B. is grateful to IISER Pune for a research fellowship. S.S. acknowledges Prime Minister’s Research Fellowship (PMRF), Ministry of Education, India. M.M. acknowledges the Russian Science Foundation, grant 24-43-00006
Аннотация: Halide double perovskites like Cs2NaBiCl6 are good host materials for luminescent dopants like Mn2+. The nature of photoluminescence (PL) depends on the local structure around the dopant ion, and doping may sometimes influence the global structure of the host. Here, we unveil the correlation between the temperature-induced (global) structural phase transition of Mn2+-doped Cs2NaBiCl6 with the local structure and PL of the Mn2+ dopant. X-ray diffraction analysis shows Mn2+-doped Cs2NaBiCl6 is in a cubic (Fm3m) phase between 300 and 110 K, below which the phase changes to tetragonal (I4/mmm), which persists at least until 15 K. The small (∼1%) doping amount does not alter the phase transition behavior of Cs2NaBiCl6. Importantly, the phase transition does not influence the Mn2+ d-electron PL. The PL peak energy, intensity, spectral width, and lifetime do not show any signature of the phase transition between 300–6 K. The hyperfine splitting in temperature-dependent electron paramagnetic spectra of Mn2+ ions also remain unchanged across the phase transition. These results suggest that the global structural phase transition of the host does not influence the local structure and emission property of the dopant Mn2+ ion. This structure–property insight might be explored for other transition-metal- and lanthanide-doped halide double perovskites as well. The stability of dopant emission regardless of the structural phase transition bodes well for their potential applications in phosphor-converted light emitting diodes.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Гамов, Александр
Заглавие : Совместная реализация нетривиальной топологии и ферромагнетизма в слоях Te-Mn-Te изолятора MnBi2Te4
Коллективы : Федеральный исследовательский центр "Красноярский научный центр Сибирского отделения Российской академии наук", Институт физики им. Л.В. Киренского Сибирского отделения РАН, Институт биофизики Сибирского отделения РАН, Институт химии и химической технологии Сибирского отделения РАН, Институт вычислительного моделирования Сибирского отделения РАН, Институт леса им. В. Н. Сукачева Сибирского отделения РАН, Научно-исследовательский институт медицинских проблем Севера, Междисциплинарная конференция молодых ученых ФИЦ КНЦ СО РАН
Место публикации : Тезисы докладов Междисциплинарной конференции молодых ученых ФИЦ КНЦ СО РАН (КМУ-XXVII). - Красноярск: ИФ СО РАН, 2024. - Секция "Физика". - С. 12. - ISBN 978-5-6050878-5-4
Примечания : Библиогр.: 6. - РНФ № 23-22-10021, Красноярский краевой фонд науки
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tarasov A. S., Komogortsev S. V., Lukyanenko A. V., Yakovlev I. A., Tarasov I. A., Sukhachev A. L., Rautskii M. V., Solovyov L. A., Andryushchenko T. A., Bondarev I. A., Varnakov S. N., Volkov N. V.
Заглавие : Structure, magnetic and magnetocaloric properties of the Mn5Ge3 thin film grown on Si(111)
Колич.характеристики :14 с
Место публикации : J. Mater. Sci. - 2024. - Vol. 59, Is. 21. - P.9423-9436. - ISSN 00222461 (ISSN), DOI 10.1007/s10853-024-09755-6. - ISSN 15734803 (eISSN)
Примечания : Cited References: 79. - The study was supported by the Russian Science Foundation Grant of the № 23-22-10033, https://rscf.ru/project/23-22-10033/, Krasnoyarsk Regional Fund of Science. The authors thank the laboratory of the Magnetic MAX Materials created under the Megagrant project (agreement no. 075-15-2019-1886) for providing experimental equipment and the Collective Use Center at the Krasnoyarsk Scientific Center (Siberian Division, Russian Academy of Sciences) for assistance
Аннотация: Mn5Ge3 is a ferromagnetic hexagonal crystal promising for spintronics and magnetocalorics. A systematic study and analysis of the magnetic properties of the Mn5Ge3 thin film grown on Si(111) were performed. The magnetic anisotropy of the film is determined by the shape anisotropy and the easy magnetization axis aligned along the c axis of the crystal. The uniaxial anisotropy constant Ku fully corresponds to that for a bulk single crystal, which indicates that c axis coincides with film normal. Mn5Ge3 film demonstrates high saturation magnetization MS = 900 emu/cm3 (900 kA/m) at T = 100 K and magnetocaloric effect ΔS = 3.16 ± 0.22 J kg−1 K−1 at 300 K and B = 1.5 T. ΔS is comparable to that for multicomponent or Gd rare earth films. Furthermore, a different anisotropy of the magnetocaloric effect compared to bulk Mn5Ge3 was found, which may be related to the anisotropy of the film shape and, possibly, to the domain structure. The results obtained are promising for the design and development of magnetocaloric, spintronic, and spin-caloritronic devices on a silicon platform.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhandun V. S., Zamkova N. G., Draganyuk O. N.
Заглавие : The arising of ferromagnetism in Al-doped Mn2(Ga1−xAlx)C MAX phases
Колич.характеристики :5 с
Место публикации : J. Magn. Magn. Mater. - 2024. - Vol. 601. - Ст.172193. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2024.172193. - ISSN 18734766 (eISSN)
Примечания : Cited References: 30. - The study was funded by a grant from the Russian Science Foundation # 23-22-10020 https://rscf.ru/project/23-22-10020/, Krasnoyarsk Regional Fund of Science. The calculations were performed with the computer resources of "Complex modeling and data processing research installations of mega-class" SRC "Kurchatovsky Institute" (http://ckp.urcki.ru). The ternary phase diagrams for the calculation of formation enthalpies were taken from Materials Project (https://materialsproject.org) and OQMD (https://oqmd.org/) databases
Аннотация: The magnetic properties of ordered MAX phases Mn2(AlxGa1−x)C (x = 0.125, 0.25, 0.5, 0.75 and 0.875) have been studied within the DFT-GGA. We have found that increase of Al atom at A-site leads to the formation of the ferromagnetic phase with large magnetization of about 3.6 μB/f.u. The investigation of the phase stability is performed by comparing the total energy of the MAX phases with that of a set of competitive phases for calculation of the phase formation enthalpy. Up to a concentration of Al atoms x = 0.7 the compound remains thermodynamically stable. The exchange constants analysis shows the crucial role of exchange interactions between manganese atoms along the c-axis in forming of ferromagnetism. The magnetic transition temperature of Mn2(AlxGa1−x)C alloys increases with increase of the aluminum concentration.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Belskaya N. A., Molokeev M. S., Bovina A. F., Shabanova K. A., Kokh D., Seretkin Yu. V., Velikanov D. A., Eremin E. V., Krylov A. S., Bezmaternykh L. N.
Заглавие : Growth conditions and the structural and magnetic properties of Cu2MBO5 (M = Cr, Fe, Mn) oxyborates with a ludwigite structure
Коллективы : Eurasian Symposium “Trends in Magnetism”
Место публикации : J. Exp. Theor. Phys. - 2023. - Vol. 136, Is. 1. - P.17-25. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776123010144. - ISSN 10906509 (eISSN)
Примечания : Cited References: 23. - The study was supported by the Russian Science Foundation (grant no. 22-12-20019) and Krasnoyarsk Regional Science Foundation
Аннотация: Copper oxyborate single crystals with a ludwigite structure, Cu2MBO5 (M = Cr, Fe, Mn), containing different substitutes in the trivalent subsystem have been grown from Bi2O3–MoO3–Na2O–B2O3 fluxes. The structural properties of grown compounds have been compared in detail using X-ray diffraction and Raman spectroscopy methods. In addition, these methods have been used to determine the degree of cationic ordering in these ludwigites. The temperature and field dependences of the Cu2MBO5 (M = Cr, Fe, Mn) ludwigite magnetization are presented.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Мошкина, Евгения Михайловна, Бельская Н. А., Молокеев, Максим Сергеевич, Бовина, Ася Федоровна, Шабанова К. А., Кох Д., Сереткин Ю. В., Великанов, Дмитрий Анатольевич, Еремин, Евгений Владимирович, Крылов, Александр Сергеевич, Безматерных, Леонард Николаевич
Заглавие : Сравнение условий роста, структурных и магнитных свойств оксиборатов Cu2MBO5 (M = Cr, Fe, Mn) со структурой людвигита
Коллективы : Euro-Asian Symposium "Trends in MAGnetism"
Место публикации : Журн. эксперим. и теор. физ. - 2023. - Т. 163, Вып. 1. - С. 24-34. - ISSN 00444510 (ISSN), DOI 10.31857/S0044451023010030
Примечания : Библиогр.: 23. - Работа выполнена при финансовой поддержке Российского научного фонда (грант № 22-12-20019 (https://rscf.ru/project/22-12- 20019/), Красноярского краевого фонда науки
Аннотация: Монокристаллы медных оксиборатов со структурой людвигита Cu2MBO5 (M = Cr, Fe, Mn) с разными замещениями в трехвалентной подсистеме были получены из растворов-расплавов на основе Bi2O3-MoO3-Na2O-B2O3. Проведено подробное сравнение структурных свойств полученных соединений с помощью методов рентгеноструктурного анализа и спектроскопии комбинационного рассеяния света. С помощью данных методик также проанализирована степень катионного упорядочения в данных людвигитах. Представлены и проанализированы температурные и полевые зависимости намагниченности полученных людвигитов Cu2MBO5 (M = Cr, Fe, Mn).
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ming, Hong, Zhao, Yifei, Zhou, Yayun, Molokeev M. S., Wang, Yuanjing, Song, Enhai, Zhang, Qinyuan
Заглавие : Chemical group substitution enables highly efficient Mn4+ luminescence in heterovalent systems
Место публикации : Adv. Optical Mater. - 2023. - Vol. 11, Is. 10. - Ст.2300076. - ISSN 21951071 (eISSN), DOI 10.1002/adom.202300076
Примечания : Cited References: 36. - This work was financially supported by the National Key Research and Development Program of China (2022YFB3503800), the National Science Foundation of China (Grant Nos. 52202170 and 51972117). This work was also funded by RFBR according to the research project No. 19-52-80003
Аннотация: Defects are a double-edged sword for heterovalent metal-ion doping phosphors. Along with the luminescence tunability of phosphors bestowed by defects, their expected luminescence efficiency would also be inevitably lowered due to the presence of these quenching sites. Herein, a chemical group substitution strategy is proposed, where inorganic polyhedrons act as the smallest chemical units during the structural evolution of the doping process. Such a method can not only effectively prevent the defect generation for charge compensation in heterovalent doping systems, but also facilitate the incorporation of activators into the matrix, leading to extremely high luminescence efficiency. The concept is first confirmed energetically favorable by first-principles simulations. As a robust experimental proof, two newly reported Mn4+-incorporated hexavalent organic-inorganic hybrid oxyfluorides (TMA)2BO2F4:Mn4+ (where TMA stands for tetramethylammonium, and B = W6+ or Mo6+) present high quantum efficiency (up to 94.4%) and short lifetime (down to 2.26 ms) that are superior to the commercial red phosphor K2SiF6:Mn4+ (≈84.8%, ≈8.06 ms). Utilizing the differences in decay lifetimes and thermal quenching behaviors of (TMA)2BO2F4:Mn4+ and K2SiF6:Mn4+, a time- and temperature-resolved single-color multiplexing mode with high-safety and easy-access is developed for information security. This work offers an effective strategy to manipulate defect generation in luminescent materials.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Мошкина, Евгения Михайловна, Молокеев, Максим Сергеевич, Еремин, Евгений Владимирович, Безматерных, Леонард Николаевич
Заглавие : Влияние Ga-замещения на структурные и магнитные свойства биксбиита (Mn,Fe)2O3
Колич.характеристики :6 с
Место публикации : Физ. твердого тела. - 2023. - Т. 65, Вып. 6. - С. 1054-1059. - ISSN 03673294 (ISSN), DOI 10.21883/FTT.2023.06.55665.57. - ISSN 17267498 (eISSN)
Примечания : Библиогр.: 17. - Исследование выполнено за счет гранта Российского научного фонда N 21-72-00130, https://rscf.ru/project/21-72-00130/
Аннотация: Для изучения зависимости свойств тройных оксидов (Mn,Fe,Ga)2O3 со структурой биксбиита от состава были исследованы температурные зависимости намагниченности и ac магнитной восприимчивости двух монокристаллических образцов разного состава, полученных с помощью раствор-расплавного метода. Выполнено подробное исследование структуры с помощью монокристального рентгеноструктурного анализа, проанализированы изменения структурных параметров в зависимости от состава. Выполнены исследования dc намагниченности и ac магнитной восприимчивости биксбиитов Fe1.1Mn0.76Ga0.14O3 и Fe0.65Mn1.1Ga0.26O3. Несмотря на качественно похожее поведение магнитных свойств и небольшую разницу в соотношении Mn/Fe/Ga в исследуемых образцах, были обнаружены и существенные различия. Показано, что оба соединения при понижении температуры испытывают два последовательных низкотемпературных магнитных фазовых перехода из парамагнитной фазы при T = 20 – 32 K. Вычисления значений параметра Мидоша обнаруженных фазовых переходов показали разную степень упорядочения в исследуемых соединениях.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Eremin E. V., Veligzhanin A. A., Chernyshov A. V., Kartashev A. V., Velikanov D. A.
Заглавие : Magnetic transitions and different valence states of manganese ions in solid solutions (Ni,Cu,Mn)3BO5
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 2. - P.260-269. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.02.55410.512. - ISSN 10906460 (eISSN)
Примечания : Cited References: 22. - The study was done with financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and the Krasnoyarsk Regional Fund of Science within scientific project No. 20-42-240011
Аннотация: The content of metal ions and their valence state for three NixCuyMn3–x–yBO5 compositions were estimated by EXAFS and XANES spectroscopy methods. In all three compositions, the copper y content did not exceed 0.25; in the third composition, some manganese ions entered the compound not only in the trivalent, but also in the divalent state. A detailed study of the magnetic properties showed that two magnetic transitions are observed in all compositions: one in the region of 60–75 K, and the second in the region of 10 K. Based on the exchange interactions calculated within the framework of the empirical model, the magnetic ordering temperatures for two- and three-lattice magnets were determined and it was assumed that the magnetic transition in the region of 60–75 K is associated with the ordering of magnetic moments in positions 2 and 3.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Андрющенко, Татьяна Александровна, Лященко, Сергей Александрович, Лукьяненко, Анна Витальевна, Варнаков, Сергей Николаевич, Овчинников, Сергей Геннадьевич
Заглавие : Оже-электронная спектроскопия поверхности MAX-пленок (Cr0.5Mn0.5)2GaC, окисленной в результате хранения на воздухе
Место публикации : Письма в ЖТФ. - 2023. - Т. 49, Вып. 14. - С. 22-27. - ISSN 17267471 (eISSN), DOI 10.21883/PJTF.2023.14.55821.19430. - ISSN 03200116 (ISSN)
Примечания : Библиогр.: 16. - Исследование выполнено за счет гранта Российского научного фонда N 21-12-00226 (http://rscf.ru/project/21-12-00226/)
Аннотация: Методом оже-электронной спектроскопии в совокупности с ионным травлением проведен анализ химического связывания атмосферного кислорода с хромом и марганцем на поверхности эпитаксиальной MAX-фазы (Cr0.5Mn0.5)2GaC. Обнаружено, что для данной системы характерно анизотропное окисление, при котором атомы кислорода связываются с атомами хрома и марганца активнее на краях кристаллитов слоистой MAX-фазы в отличие от базальной плоскости (0001). При этом на последней наблюдается доминирование химической связи Mn–O над связью Cr–O.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu, Qin, Dang, Peipei, Zhang, Guodong, Molokeev M. S., Polyutov, Sergey, Lian, Hongzhou, Cheng, Ziyong, Li, Guogang, Lin, Jun
Заглавие : Achieving excellent thermostable red emission in singly Mn2+-doped near zero thermal expansion (NZTE) material Li2Zn3(P2O7)2
Колич.характеристики :10 с
Место публикации : J. Mater. Chem. C. - 2023. - Vol. 11, Is. 31. - P.10684-10693. - ISSN 20507526 (ISSN), DOI 10.1039/D3TC01683H. - ISSN 20507534 (eISSN)
Примечания : Cited References: 62. - This work wasfinancially supported by the National Science and Technology Major Project (2022YFB3503800), the Projects for Science and Technology Development Plan of Jilin Province (20210402046GH), the National Natural Science Foundation of China (NSFC No. 51932009, 51929201, 52072349, 52172166), the Natural Science Foundation of Zhejiang Province (LR22E020004), the Project funded by China Postdoctoral Science Foundation (2022TQ0365), and the Ministry of Science and High Education of Russian Federation (Project No. FSRZ2023-0006), M.S. Molokeev and S.P. Polyutov acknowledge the support by the Ministry of Science and High Education of Russian Federation (Project No. FSRZ-2023-0006)
Аннотация: The design of thermostable phosphor is still a pivotal challenge in pc-WLED applications. Herein, an efficient strategy is proposed to design excellent thermostable red emission in singly Mn2+-doped near zero thermal expansion (NZTE) material Li2Zn3(P2O7)2. Under the excitation of 412 nm wavelength, the emission could be tuned from 636 to 672 nm by increasing the Mn2+ doping level via synthetic effect among crystal field, the exchange coupling interaction in Mn-Mn dimers and energy transfer in different luminescence centers. The PL intensity of LZPO:Mn2+ maintains 97% at 150 °C and 94% at 200 °C of initial intensity at the room temperature. During the heat process, the LZPO presents near zero thermal expansion, which contributes to the nearly unaffected PL intensity. The traps assist energy transfer to luminescent center is also compensated for the emission loss. This work not only offers a perspective idea for elucidating the correlation between crystal structure and optical properties, but also opens a new way in line with that of designing excellent thermostable luminescent materials based on NZTE materials in self-reduction system.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Seryotkin, Yurii, Bayukov O. A., Molokeev M. S., Kokh, Dieter, Smorodina, Ekaterina, Krylov A. S., Bezmaternykh L. N.
Заглавие : Flux growth and phase diversity of the triple oxides of transition metals (Mn,Fe,Ga)2O3 in multicomponent fluxes based on Bi2O3–MoO3–B2O3–Na2O
Колич.характеристики :11 с
Место публикации : CrystEngComm. - 2023. - Vol. 25, Is. 18. - P.2824-2834. - ISSN 14668033 (eISSN), DOI 10.1039/D3CE00147D
Примечания : Cited References: 38. - The study was supported by the Russian Science Foundation (grant no. 21-72-00130)
Аннотация: To determine the mutual influence of the solvent and soluble in multicomponent fluxes based on Bi2O3–MoO3–B2O3–Na2O, the crystallization of the triple oxides of the transition metals (Mn,Fe,Ga)2O3 is investigated, namely the phases based on orthorhombic FeGaO3 and bixbyite FeMnO3. Simultaneously, a set of fluxes is studied based on the variation in the component ratio with regard to the solvent and soluble. The crucial role of various components of the flux system is considered at the intersection of the phase boundaries. Fluxes for the stable growth of (Mn,Fe,Ga)2O3 single crystals of the studied phases (based on orthorhombic FeGaO3 and bixbyite FeMnO3) are determined. A set of single crystal samples (9 samples) with different Fe/Mn/Ga ratios is obtained. The actual composition of the samples is studied using the EDX technique. The partition coefficients of Fe2O3, Mn2O3 and Ga2O3 in the studied fluxes are analyzed. The structure of the obtained samples is characterized using X-ray diffraction methods, including the phase composition, space group and lattice parameters. The room temperature Raman spectra of the obtained samples are presented. The distribution of iron cations over the crystal positions in the obtained phases is studied using Mossbauer spectroscopy.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Narkevich N., Vlasov I., Volochaev M. N., Gomorova Y., Mironov Y., Panin S., Berto F., Maksimov P., Deryugin E.
Заглавие : Low-temperature deformation and fracture of Cr-Mn-N stainless steel: Tensile and impact bending tests
Место публикации : Metals. - 2023. - Vol. 13, Is. 1. - Ст.95. - ISSN 20754701 (eISSN), DOI 10.3390/met13010095
Примечания : Cited References: 41. - The research was funded by RSF, project No. 22-29-00438. The low-temperature tensile tests were carried out in accordance with the state assignment for the ISPMS SB RAS, project No. FWRW-2021-0009
Аннотация: The paper presents the results of tensile and impact bending tests of 17%Cr-19%Mn-0.53%N high-nitrogen austenitic stainless steel in temperatures ranging from −196 to 20 °C. The steel microstructure and fracture surfaces were investigated using transmission and scanning electron microscopes, as well as X-ray diffraction analysis. The steel experiences a ductile-to-brittle transition (DBT); however, it possessed high tensile and impact strength characteristics, as well as the ductile fracture behavior at temperatures down to −114 °C. The correspondence between γ–ε microstructure and fracture surface morphologies was revealed after the tensile test at the temperature of −196 °C. In this case, the transgranular brittle and layered fracture surface was induced by ε-martensite formation. Under the impact bending test at −196 °C, the brittle intergranular fracture occurred at the elastic deflection stage without significant plastic strains, which preceded a failure due to the high internal stresses localized at the boundaries of the austenite grains. The stresses were induced by: (i) segregation of nitrogen atoms at the grain boundaries and in the near-boundary regions, (ii) quenching stresses, and (iii) reducing fcc lattice volume with the test temperature decrease and incorporation of nitrogen atoms into fcc austenite lattice. Anisotropy of residual stresses was revealed. This was manifested in the localization of elastic deformations of the fcc lattice and, consequently, the stress localization in 100-oriented grains; this is suggested to be the reason of brittle cleavage fracture.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wu, Yanzheng, Li, Weiqiang, Zheng, Yifan, Xu, Yiqin, Wen, Dawei, Molokeev M. S., Pan, Zaifa
Заглавие : Apatite oxynitride phosphor (Mg,Y)5Si3(O,N)13:Ce3+,Mn2+: A single-phased host with solar-like and efficient emission
Место публикации : J. Am. Ceram. Soc. - 2023. - Vol. 106, Is. 5. - P.2985-2996. - ISSN 00027820 (ISSN), DOI 10.1111/jace.18981. - ISSN 15512916 (eISSN)
Примечания : Cited References: 35. - This work was supported by the National Natural Science Foundation of China (Project No. 10804099, 21804119), Key projects of Zhejiang Natural Science Foundation (Project No. LZ18B050002), GDAS’ Project of Science and Technology Development (Nos. 2021GDASYL-20210103069, 2021GDASYL-20210103071)
Аннотация: During pursuing high color rendering index for full-color-emitting phosphor, low quantum efficiency (QE) is usually accompanying. We intend to elevate the luminescence efficiency when realizing a solar-like spectra distribution, by constructing apatite structure oxynitride, inheriting high covalence and rigidity from oxynitride, and suitable multiple cation sites from oxyapatite compounds. Full-color-emitting apatite structure oxynitride phosphor (Mg,Y)5Si3(O,N)13:Ce3+,Mn2+ has been prepared, and the crystal sites’ occupancies of activators in this host were favorable for white emission. (Mg,Y)5Si3(O,N)13:Ce3+,Mn2+ phosphor shows whole visible light with emission wavelength ranging from 370 to 750 nm, matching the spectra of sunlight quite well. The fabricated white light-emitting diode lamp demonstrated the distinctive overall performance of QE and chromaticity properties (Ra and R9). Furthermore, correlated color temperature is tunable from cool nature to warm white. The obtained lamp possesses the feature of less blue light hazard and high saturation of red degree, compared with the commercial YAG-based lamp.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Molchanova, Anastasiia, Boldyrev, Kirill, Kuzmin, Nikolai, Veligzhanin, Alexey, Khaydukov, Kirill, Khaydukov, Evgeniy, Kondratev, Oleg, Gudim I. A., Mikliaeva, Elizaveta, Popova, Marina
Заглавие : Manganese luminescent centers of different valence in yttrium aluminum borate crystals
Место публикации : Materials. - 2023. - Vol. 16, Is. 2. - Ст.537. - ISSN 19961944 (eISSN), DOI 10.3390/ma16020537
Примечания : Cited References: 49. - This work was supported in part by the Russian Science Foundation under Grant No. 21-72-00134. K.B. and M.P. acknowledge financial support from the Ministry of Science and Higher Education of Russia under Grant 0039-2019-0004
Аннотация: We present an extensive study of the luminescence characteristics of Mn impurity ions in a YAl3(BO3)4:Mn crystal, in combination with X-ray fluorescence analysis and determination of the valence state of Mn by XANES (X-ray absorption near-edge structure) spectroscopy. The valences of manganese Mn2+(d5) and Mn3+(d4) were determined by the XANES and high-resolution optical spectroscopy methods shown to be complementary. We observe the R1 and R2 luminescence and absorption lines characteristic of the 2E ↔ 4A2 transitions in d3 ions (such as Mn4+ and Cr3+) and show that they arise due to uncontrolled admixture of Cr3+ ions. A broad luminescent band in the green part of the spectrum is attributed to transitions in Mn2+. Narrow zero-phonon infrared luminescence lines near 1060 nm (9400 cm−1) and 760 nm (13,160 cm−1) are associated with spin-forbidden transitions in Mn3+: 1T2 → 3T1 (between excited triplets) and 1T2 → 5E (to the ground state). Spin-allowed 5T2 → 5E Mn3+ transitions show up as a broad band in the orange region of the spectrum. Using the data of optical spectroscopy and Tanabe–Sugano diagrams we estimated the crystal-field parameter Dq and Racah parameter B for Mn3+ in YAB:Mn as Dq = 1785 cm−1 and B = 800 cm−1. Our work can serve as a basis for further study of YAB:Mn for the purposes of luminescent thermometry, as well as other applications.
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