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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sablina K. A., Udod L. V., Pankrats A. I., Velikanov D. A., Vasiliev A. D., Bovina A. F., Bondarenko G. V.
Заглавие : Effect of substitution on magnetic properties of CuB2O4
Место публикации : Moscow International Symposium on Magnetism, Moscow, 2008, p.687
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Petrov M. I., Gokhfeld Yu. S., Balaev D. A., Popkov S. I., Dubrovskiy A. A., Gokhfeld D. M., Shaykhutdinov K. A.
Заглавие : Pinning enhancement by heterovalent substitution in Y1−xRExBa2Cu3O7−δ
Место публикации : 25th International Conference on Low Temperature Physics (LT25). – Amsterdam, Netherlands. - August 6-13. – 2008. – PB-Tu130, p.304
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Fokina V.D., Flerov I.N., Molokeev M.S., Pogoreltsev E.I., Bogdanov E.V., Laptash N.M.
Заглавие : Effect of central cation substitution on the properties and phase transitions in (NH4)3Me(O2)2F4 oxyfluorides
Коллективы : International Seminar on Ferroelastic Physics
Место публикации : The 6th International Seminar on Ferroelastics Physics (ISFP-6): Voronezh, September 22–25, 2009. - С. 43
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yang Ch., Zheng D., Zou X., Dai X., Tang B., Molokeev M. S., Zhang X., Zhang H., Liu Y., Lei B.
Заглавие : Highly-efficiency far-red emission in Cr3+ activated Ca1.8Mg1.2Al2Ge3O12 toward plant precise lighting
Колич.характеристики :9 с
Место публикации : Adv. Opt. Mater. - 2024. - Ст.2303235. - Article in press. - ISSN 21951071 (eISSN), DOI 10.1002/adom.202303235
Примечания : Cited References: 48. - The work was supported by the National Natural Science Foundations of China (No. 12274144), the Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (No. 2023KJ122), the Key Realm R&D Program of Guangdong Province (No. 2021B0707010003), the Guangdong Provincial Science and Technology Project (No. 2022A1515010229), and the Project of GDUPS (2018) for Prof. Bingfu LEI
Аннотация: Far-red (FR) region (beyond 700 nm) lighting sources possess special potential for plant lighting. However, it remains a challenge to obtain high-performance Cr3+-doped FR phosphors. This study developed a FR phosphor, Ca1.8Mg1.2Al2Ge3O12:Cr3+ (CMAGG: Cr3+), using the cation substitution strategy. Under 438 nm blue light excitation, the phosphors display FR emission centered at 720 nm with a full width at half maximum (FWHM) of 91 nm. Benefit from the favorable match with the FR phytochrome (Pfr), the phosphor is combined with InGaN blue light chips to create a FR phosphor-converted light-emitting diode (pc-LED), which is used in Italian lettuce growth experiments and it results shown in a 15% increase in fresh weight and a 6.5% increase in dry weight. Notably, supplemental FR light modulated its growth morphology. The results of this study will be useful for further research on novel Cr3+-doped FR phosphors to meet the precise spectral requirements for plant growth.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang S., Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S., Atuchin V.
Заглавие : Structural and spectroscopic effects of Li+ substitution for Na+ in LixNa1–xCaLa0.5Er0.05Yb0.45(MoO4)3 upconversion scheelite-type phosphors
Место публикации : Crystals. - 2023. - Vol. 13, Is. 2. - Ст.362. - ISSN 20734352 (eISSN), DOI 10.3390/cryst13020362
Примечания : Cited References: 63. - This study was funded by the Research Program through the Campus Research Foundation funded by Hanseo University in 2022 (2022046)
Аннотация: New triple molybdates LixNa1−xCaLa0.5(MoO4)3:Er3+0.05/Yb3+0.45 (x = 0, 0.05, 0.1, 0.2, 0.3) were manufactured successfully using the microwave-assisted sol-gel-based technique (MAS). Their room-temperature crystal structures were determined in space group I41/a by Rietveld analysis. The compounds were found to have a scheelite-type structure. In Li-substituted samples, the sites of big cations were occupied by a mixture of (Li, Na, La, Er, Yb) ions, which provided a linear cell volume decrease with the Li content increase. The increased upconversion (UC) efficiency and Raman spectroscopic properties of the phosphors were discussed in detail. The mechanism of optimization of upconversion luminescence upon Li content variation was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. The UC luminescence maximized at lithium content x = 0.05. The mechanism of UC optimization was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. Over the whole spectral range, the Raman spectra of LixNa1−xCaLa0.5(MoO4)3 doped with Er3+ and Yb3+ ions were totally superimposed with the luminescence signal of Er3+ ions, and increasing the Li+ content resulted in the difference of Er3+ multiple intensity. The density functional theory calculations with the account for the structural disorder in the system of Li, Na, Ca, La, Er and Yb ions revealed the bandgap variation from 3.99 to 4.137 eV due to the changing of Li content. It was found that the direct electronic transition energy was close to the indirect one for all compounds. The determined chromaticity points (ICP) of the LiNaCaLa(MoO4)3:Er3+,Yb3+ phosphors were in good relation to the equal-energy point in the standard CIE (Commission Internationale de L’Eclairage) coordinates.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Дмитриев Д. Д., Лексиков, Андрей Александрович, Гладышев А. Б.
Заглавие : Решая задачи импортозамещения. Результаты научной кооперации Военного учебного центра СФУ с Красноярским научным центром Сибирского отделения РАН
Колич.характеристики :5 с
Место публикации : Вестн. воен. образования. - 2023. - № 4. - С. 84-88. - ISSN 25003704 (ISSN)
Аннотация: В работе приведены результаты разработки и исследования конструкции миниатюрного полосно-пропускающего фильтра на основе многопроводниковых полосковых резонаторов. В программе электродинамического анализа спроектирован, а затем изготовлен полосно-пропускающий фильтр шестого порядка на семипроводниковых резонаторах.The paper presents the results of the development and research of the design of a miniature bandpass filter based on multiconductorstripline resonators. In the program of electrodynamic analysis, a sixth-order band-pass filter was designed and then manufactured on seven-wire resonators.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Kozak V. V., Fedorova N. A., Olshevskaya J., Kovaleva A. V., Shubin A. A., Tarasov A. S., Ovchinnikova T. M., Varnakov S. N., Tomilin F. N.
Заглавие : Substitution effect of magnetic MAX-phases (Cr4-xFex)0.5AC (A = Ge, Si, Al)
Коллективы : International Baltic Conference on Magnetism, Балтийский федеральный университет им. И. Канта
Место публикации : V International Baltic Conference on Magnetism. IBCM: Book of abstracts. - 2023. - P.103
Примечания : РНФ № 21-12-00226
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorova, Natalja A., Kovaleva, Alena V., Olshevskaya Ju. S., Ivanova D. A., Kozak V. V., Shubin A. A., Tarasov A. S., Varnakov S. N., Ovchinnikov S. G., Moshkina E. M., Maximova O. A., Avramov P. V., Tomilin F. N.
Заглавие : Substitution effects in spin-polarized (Cr4-xFex)0.5AC (A = Ge, Si, Al) MAX phases
Место публикации : Magnetochemistry. - 2023. - Vol. 9, Is. 6. - Ст.147. - ISSN 23127481 (eISSN), DOI 10.3390/magnetochemistry9060147
Примечания : Cited References: 59. - This study was supported by the Russian Science Foundation, project no. 21-12-00226. P.V.A. acknowledges the support of the National Research Foundation of the Republic of Korea, grant no. NRF 2021R1A2C1010455
Аннотация: The use of spintronic devices with a tunable magnetic order on small scales is highly important for novel applications. The MAX phases containing transition metals and/or magnetic ion-substituted lattices attract a lot of attention. In this study, the magnetic and electronic properties of (Cr4-xFex)0.5AC (A = Ge, Si, Al) compounds were predicted and investigated within the density functional theory. It was established that single-substituted (Cr3Fe1)0.5AC (A = Ge, Si, Al) lattices are favorable in terms of energy. An analysis of the magnetic states of the MAX phases demonstrated that their spin order changes upon substitution of iron atoms for chromium ones. It was found that mostly the (Cr4-xFex)0.5GeC and (Cr4-xFex)0.5AlC lattices acquire a ferrimagnetic state in contrast to (Cr4-xFex)0.5SiC for which the ferromagnetic spin order dominates. It was pointed out that the atomic substitution could be an efficient way to tune the magnetic properties of proposed (Cr4-xFex)0.5AC (A = Ge, Si, Al) MAX phases.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Molokeev M. S., Eremin E. V., Bezmaternykh L. N.
Заглавие : Influence of Ga-substitution to the structural and magnetic properties of (Mn,Fe)2O3 bixbyite
Колич.характеристики :6 с
Коллективы : Nanophysics and Nanoelectronics, International Symposium
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 6. - P.1009-1014. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.06.56116.57. - ISSN 10906460 (eISSN)
Примечания : Cited References: 17. - This study was supported by grant № 21-72-00130, provided by the Russian Science Foundation (https://rscf.ru/project/21-72-00130/.)
Аннотация: To study the dependence of the properties of ternary oxides (Mn,Fe,Ga)2O3 with the bixbyite structure on the composition, the temperature dependences of the magnetization and ac magnetic susceptibility of two single-crystal samples of different compositions obtained using the flux method were analyzed. A detailed study of the structure was carried out using single-crystal X-ray diffraction analysis, and the changes in structural parameters depending on the composition were analyzed. The dc magnetization and ac magnetic susceptibility of Fe1.1Mn0.76Ga0.14O3 and Fe0.65Mn1.1Ga0.26O3 bixbyites have been studied. Despite the qualitatively similar behavior of the magnetic properties, significant differences were also found, despite a small difference in the Mn/Fe/Ga ratio in the samples under study. It is shown that both compounds experience two successive low-temperature magnetic phase transitions from the paramagnetic phase at T = 20 – 32 K as the temperature is lowered. Calculations of the Mydosh parameter for the detected phase transitions showed different degrees of ordering in the compounds under study.
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