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Zhandun, V. S.
The spin-state transition in ACo2O4 spinels (A = Be, Mg, Ca, Cd, Zn) / V. S. Zhandun, O. N. Draganyuk // J. Magn. Magn. Mater. - 2022. - Vol. 552. - Ст. 169206, DOI 10.1016/j.jmmm.2022.169206. - Cited References: 51. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects № 19-42-240016: «Control of structural, magnetic, electronic, and optical properties by pressure and intercalation into functional compounds with a spinel structure containing 3d and 4f ions» and № 20-42-240004: “The effect of the composition, pressure, and dimension on the magnetic, electronic, optical, and elastic properties of the magnetic Mn+1AXn (M = Cr, Mn; Fe, A = Al, Ga, Si, Ge, P, In; X = C, N; n = 1-3) MAX-phases”. 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) . - ISSN 0304-8853
Кл.слова (ненормированные):
Ab initio calculations -- Spinels -- Cobalt ion -- Oxides -- Spin-state transition -- Thin films -- Pressure
Аннотация: The magnetic and electronic properties of the Co-based spinel oxides ACo2O4 (A = Be, Mg, Ca, Zn, Cd) were studied within GGA + U approach. It was found that the Co3+ ion is in a low-spin state due to the effect of the crystal field of octahedral symmetry. It is shown that Co3+ ion undergoes a spin-state transition into the high-spin state under the critical pressure of P = −10 GPa – −20 GPa. This pressure-induced spin-state transition is caused by the redistribution of electrons between the t2g- and eg-orbitals arising with increasing interatomic distances. The role of interatomic distances between Co3+ ion and its ligands is discussed. Thin-film form also favors the appearance of a high-spin state of Co3+ ion. At the same critical pressure, there is a sharp increase in the majority spin bandgap and a sharp decrease in the minority spin bandgap. These findings allow manipulating the spin state of Co3+ ions and bandgap width through the pressure or strain arising in thin films.

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Держатели документа:
Kirensky Institute of Physics - Federal Research Center “Krasnoyarsk Science Centre, Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Draganyuk, O. N.; Драганюк, Оксана Николаевна; Жандун, Вячеслав Сергеевич
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Гидрирование нанодисперсных порошков, образующихся в потоке углеродно-гелиевой плазмы при введении Ni и Mg / Г. П. Чурилов [и др.] // Журнал экспериментальной и теоретической физики. - 2011. - Т. 140, № 6. - С. 1211-1217 . - ISSN 0044-4510
Аннотация: Представлены как теоретические, так и экспериментальные исследования композитных наночастиц, состоящих из магния, никеля и углерода. Расчеты, выполненные в рамках теории формализма функционала плотности, показали, что частота перескоков атомов водорода внутри гидрида магния, содержащего никель, вблизи примесных атомов никеля существенно возрастает, в связи с чем увеличивается скорость абсорбции водорода магнием. Также показано, что никель на поверхности магния адсорбируется по механизму островкового роста. Экспериментально с помощью плазмохимического синтеза в потоке углеродно-гелиевой плазмы были получены композитные порошки составов: Mg-C, Ni-C, Mg-Ni-C. Водород вводился в камеру в процессе синтеза. Методами рентгеновской фотоэлектронной спектроскопии и термогравиметрического анализа было показано, что из трех рассмотренных композитов только Mg-Ni-C содержал магний в соединении Mgllj. Процесс такого «сверхбыстрого» гидрирования магния, происходящий за время образования наночастиц композита, можно объяснить каталитическим действием никеля, которое усиливается высокой температурой. В работе приведены фотографии, полученные на растровом электронном микроскопе, которые позволяют наблюдать динамику процесса дегидрирования частиц композита Mg-Ni-C при нагреве электронным пучком.

РИНЦ
Держатели документа:
Институт физики им. Л. В. Киренского Сибирского отделения Российской академии наук
Институт химии и химической технологии Сибирского отделения Российской академии наук
Институт химии твердого тела и механохимии Сибирского отделения Российской академии наук

Доп.точки доступа:
Чурилов, Григорий Николаевич; Churilov, G. N.; Черепахин, Александр Владимирович; Cherepakhin, A. V.; Осипова, Ирина Владимировна; Osipova, I. V.; Томашевич, Евгений Владимирович; Tomashevich, Y. V.; Глущенко, Гарий Анатольевич; Glushchenko, G. A.; Федоров, Александр Семенович; Fedorov, A. S.; Попов, Захар Иванович; Popov, Z. I.; Булина, П. В.; Верещагин, С. П.; Жижаев, Анатолий Михайлович; Zhyzhaev, A. M.
}
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    Obtaining particles with the structure Mg@C and (Mg@C)@Pd, their properties and stability in the hydrogenation/dehydrogenation processes / G. N. Churilov, N. S. Nikolaev, V. I. Elesina [et al.] // Int. J. Hydrogen Energy. - 2022. - Vol. 47. Is. 11. - P. 7299-7309, DOI 10.1016/j.ijhydene.2021.03.042. - Cited References: 46 . - ISSN 0360-3199
   Перевод заглавия: Получение частиц со структурой Mg@C и (Mg@C)@Pd, их свойства и стабильность в процессах гидрирования /дегидрирования
Кл.слова (ненормированные):
Core-shell particles -- Mg, С, Рd nanoparticles -- Sorption capacity of hydrogen -- Hydrogen-storage materials -- Magnesium hydride
Аннотация: In this work, we studied the change in the properties of powders with a core (magnesium) – shell structure (carbon and carbon/palladium) in the process of hydrogenation/dehydrogenation with hydrogen (99.995 wt%). Magnesium powders were obtained by plasma chemical synthesis in an atmosphere of argon containing a small amount of hydrogen (2–3 at.%) and nitrogen (8–9 at.%), when performing a low-frequency arc discharge between a tungsten electrode and a magnesium melt. The shell (carbon and carbon/palladium) was deposited in a plasma generator with vortex and magnetic stabilization. For all samples, a decrease in the sorption capacity of hydrogen was observed as a result of successive cycles of sorption and desorption reactions. It was found that the reason for this fall is associated with the formation of the MgO and Mg(OH)2 phase, which prevents the diffusion of hydrogen. The carbon shell provides a more complete hydrogenation of the magnesium particles, and an additional palladium shell increases the resistance to cyclic hydrogenation/dehydrogenation and reduces the temperature of these processes. According to the data obtained, powders with particles (Mg@C)@Pd can absorb the largest amount of hydrogen (6.9 wt%) for the duration of 5 cycles, after which the protective shell of the particles begins to collapse and a loss of sorption capacity is observed.

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Держатели документа:
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Svobodny, 79, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Akademgorodok 50/24, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Churilov, G. N.; Чурилов, Григорий Николаевич; Nikolaev, N. S.; Николаев, Никита Сергеевич; Elesina, V. I.; Елесина, Виктория Игоревна; Glushenko, G. A.; Глущенко, Гарий Анатольевич; Isakova, V. G.; Исакова, Виктория Гавриловна; Tomashevich, Y. V.
}
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    Ultra-wide Vis–NIR Mg2Al4Si5O18:Eu2+,Cr3+ phosphor containing unusual NIR luminescence induced by Cr3+ occupying tetrahedral coordination for hyperspectral imaging / X. Zou, H. Zhang, W. Li [et al.] // Adv. Opt. Mater. - 2022. - Vol. 10. Is. 19. - Ст. 2200882, DOI 10.1002/adom.202200882. - Cited References: 48. - The work was supported from the National Natural Science Foundations of China (No. 21671070, 51802101), the Guangdong Basic and Applied Basic Research Foundation (No. 2021A1515012613), the Independent Research and Development Projects of Maoming Laboratory (No. 2021ZZ004), the Key Realm R&D Program of Guangdong Province (No. 2021B0707010003), the Guangdong Provincial Science & Technology Project (No. 2020A1414010046), the Guangzhou Science & Technology Project (No. 202007020005, 202103000059, and 202102020410), the Project of GDUPS (2018) for Prof. Bingfu LEI, the Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (No. 2021KJ122), and the Natural Science Foundation of Guangdong Province (No. 2022A1515010229, 2018A030310217) . - ISSN 2195-1071
   Перевод заглавия: Люминофор Mg2Al4Si5O18:Eu2+,Cr3+ со сверхшироким спектром от видимого до ИК, содержащий необычную ИК люминесценцию, индуцированную Cr3+, который занимает тетраэдрическую позицию, для гиперспектральной визуализации
Кл.слова (ненормированные):
energy transfer -- hyperspectral imaging -- light-emitting diodes -- near-infrared emission
Аннотация: Cr3+-activated broadband near-infrared (NIR) phosphors, featured by the octahedral coordination preference and strong absorption in visible (Vis) region, have great potential application in nondestructive assessment. It is still a challenge to develop Cr3+-doped phosphors with the tetrahedrally coordinated Cr3+ NIR emission behavior and ultra-wide Vis–NIR luminescence. Herein, an unusual NIR-emitting Mg2Al4Si5O18:Cr3+ phosphor offers emission peak at 867 nm with full-width at half-maximum of 237 nm due to preferential occupation of the AlO4 tetrahedra by Cr3+ as demonstrated by structural and optical properties studies. Eu2+–Cr3+ energy transfer is proposed to induce ultra-wide Vis–NIR Mg2Al4Si5O18:Eu2+,Cr3+ phosphors with more efficient NIR emission and lower thermal quenching behavior of Cr3+. The fabricated Vis–NIR phosphor-converted light-emitting diode is expected to be an alternative to halogen lamp in hyperspectral imaging. This work reveals the luminescence behavior of Cr3+ in tetrahedra and demonstrates the application of Mg2Al4Si5O18:Eu2+,Cr3+ phosphor in hyperspectral imaging, which will facilitate further research on NIR and Vis–NIR phosphors.

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Держатели документа:
Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University Guangzhou, Guangdong510642, China
Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, Maoming, 525100, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences (KSC FRC SB RAS), Krasnoyarsk, 660036, Russian Federation
The State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China
Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, 610213, China

Доп.точки доступа:
Zou, X.; Zhang, H.; Li, W.; Zheng, M.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.; Zheng, Y.; Li, Q.; Liu, Y.; Zhang, X.; Lei, B.
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Кристаллизация рентгеноаморфных cA-mG-алюмосиликатных материалов / В. Ф. Павлов, А. В. Линейцев, И. В. Павлов, В. Ф. Шабанов // Физика и химия стекла. - 2009. - Т. 35, № 5. - С. 725 . - ISSN 0132-6651

ГРНТИ

Кл.слова (ненормированные):
расплавы оксидов -- самораспространяющаяся кристаллизация
Аннотация: Рассмотрен механизм процесса кристаллизации рентгеноаморфных материалов, полученных охлаждением силикатных расплавов шихт на основе дунита и известняка, а также на основе оксидов MgO, CaO, SiO 2, после глубокого восстановительного плавления и удаления металлической части расплава, содержащего железо. Показаны особенности зарождения центров тепловой волны самораспространяющейся кристаллизации и возможность их визуализации. Приведены значения выделяемого тепла кристаллизации и изменения температуры фронта тепловой волны, определена скорость его распространения.

РИНЦ
Держатели документа:
Специальное конструкторско-технологическое бюро «Наука» Красноярского научного центра СО РАН

Доп.точки доступа:
Павлов, Вячеслав Фролович; Pavlov, V. F.; Линейцев, А. В.; Павлов, И. В.; Шабанов, Василий Филиппович; Shabanov, V. F.
}
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    Synthesis and characterization of nanoscale composite particles formed by 2D layers of Cu-Fe sulfide and Mg-based hydroxide / Y. L. Mikhlin, R. V. Borisov, S. A. Vorobyev [et al.] // J. Mater. Chem. A. - 2022. - Vol. 10, Is. 17. - P. 9621-9634, DOI 10.1039/d2ta00877g. - Cited References: 84. - This research was supported by the Russian Foundation for Basic Research, Krasnoyarsk Territory Administration and Krasnoyarsk Territory Science Foundation, project 20-43-242903. Facilities of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” were employed in the work . - ISSN 2050-7488
   Перевод заглавия: Синтез и исследование наноразмерных композитных частиц, образованных двумерными слоями сульфида Cu-Fe и гидроксида на основе Mg
Кл.слова (ненормированные):
Binary alloys -- Copper compounds -- Electron energy levels -- Electron energy loss spectroscopy -- Electron scattering -- Light absorption -- Light scattering -- Magnesium compounds -- Near infrared spectroscopy -- Paramagnetism -- Sols -- Sulfur compounds -- X-ray photoelectron spectroscopy
Аннотация: We introduce here a multifunctional material composed of alternating atomic sulfide sheets close to the composition of CuFeS2 and Mg-based hydroxide ones (valleriite), which are assembled due to their electric charges of opposite sign. Valleriite particles 50-200 nm in lateral size and 10-20 nm in thickness were synthesized via a simple hydrothermal pathway using various concentrations of precursors and dopants, and examined with XRD, TEM, EDS, X-ray photoelectron spectroscopy, reflection electron energy loss spectroscopy (REELS), Mossbauer, Raman and UV-vis-NIR spectroscopies, and magnetization, dynamic light scattering, and zeta potential measurements. The electronic, magnetic and optical characteristics are found to be critically dependent on the charge (electron density) at the narrow-gap sulfide layers containing Cu+ and Fe3+ cations, and can be tuned via the composition of the hydroxide part. Particularly, substitution of Mg2+ with Al3+ increases the negative charge of the hydroxide layers and reduces the content of Fe3+-OH centers (10-45% of total iron); the effects of Cr and Co dopants entering both layers are more complicated. Mossbauer doublets of paramagnetic Fe3+ detected at room temperature transform into several Zeeman sextets at 4.2 K; the hyperfine fields up to 500 kOe and complex magnetic behavior, but not pure paramagnetism or antiferromagnetism, were observed for valleriites with the higher positive charge of the sulfide sheets, probably due to the depopulation of the minority-spin 3d states of S-bonded Fe3+ ions. Aqueous colloids of valleriite show optical absorption at 500-750 nm, which, along with the peaks at the same energies in REELS, may arise due to quasi-static dielectric resonance involving the vacant Fe 3d band and being dependent on the composition of both layers too. These and other findings call attention to valleriites as a new rich family of 2D materials for a variety of potential applications.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of sciences, Akademgorodok, 50/24, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of sciences, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodny av. 79, Krasnoyarsk, 660041, Russian Federation
Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of sciences”, Akademgorodok, 50, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Mikhlin, Y. L.; Borisov, R. V.; Vorobyev, S. A.; Tomashevich, Y. V.; Romanchenko, A. S.; Likhatski, M. N.; Karacharov, A. A.; Bayukov, O. A.; Баюков, Олег Артемьевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Nemtsev, I. V.; Немцев, Иван Васильевич
}
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    Photoluminescence tuning in a novel Bi3+/Mn4+ co-doped La2ATiO6:(A = Mg, Zn) double perovskite structure: Phase transition and energy transfer / G. Xing [et al.] // J. Mater. Chem. C. - 2018. - Vol. 6, Is. 48. - P. 13136-13147, DOI 10.1039/c8tc05171b. - Cited References: 60. - This work was supported by the National Natural Science Foundation of China (Grant No. 51672259, 51672265, 21521092, 51750110511), the Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences (Wuhan) (No. NGM2016KF002), the Key Research Program of Frontier Sciences, CAS (Grant No. YZDYSSW-JSC018), and the projects for science and technology development plan of Jilin province (20170414003GH), the Program for Jiangmen Innovative Research Team (No. [2017]385), and the major program of basic research and applied research of Guangdong Province (2017KZDXM083). . - ISSN 2050-7534
   Перевод заглавия: Управление люминесценцией в новой структуре двойного перовскита La2ATiO6:(A = Mg, Zn) допированным Bi3+/Mn4+: фазовый переход и перенос энергии
Кл.слова (ненормированные):
Crystal symmetry -- Energy transfer -- Light -- Luminescence -- Perovskite -- Phosphors -- Rietveld refinement
Аннотация: Red-emitting phosphors are indispensable compounds which are used to achieve a warm white light in phosphor-converted white light emitting diodes (pc-WLEDs). However, the luminous efficiency and stability of red phosphors are still big challenges. In this work, we developed red-emitting double perovskite phosphors La2ATiO6:Bi3+,Mn4+ (A = Mg, Zn) (LAT:Bi3+,Mn4+) and discuss the relationship between the double perovskite phosphor structure and the luminescence performance in detail. According to the Rietveld refinement results for the La2Mg(1−w)ZnwTiO6:Bi3+,Mn4+ (0 ≤ w ≤ 1) (LM(1−w)ZwT:Bi3+,Mn4+) solid solution, the proposed mechanism of the spectral adjustment is ascribed to the appearance of the phase transition, which results in a lower local structural symmetry of the [LaO12] polyhedron and the variation of the crystal field environment for Mn4+. Notably, this is the first time that the influence of the local structure variation on the luminescence tuning in double perovskite structure phosphors has been revealed, and this could offer guidance for the development of new phosphor system. By designing Mg2+/Zn2+ cation substitution, the internal quantum efficiency (IQE) is remarkably enhanced beyond 20%. In addition, we succeeded in achieving a Bi3+/Mn4+ co-doped energy transfer in the double perovskite structure phosphors. Owing to the Bi3+ → Mn4+ energy transfer in LAT, the red emission of the Mn4+ ions could be dramatically enhanced. The energy transfer efficiency of LAT:Bi3+,Mn4+ eventually exceeded 90%. The IQE and the thermal stability were all enhanced by around 30% compared to the non-co-doped samples, respectively. These results indicate that the Bi3+ → Mn4+ energy transfer strategy could play a pivotal role in the development of highly efficient red-emitting phosphors. The performance of the fabricated pc-WLEDs devices indicates that LAT:Bi3+,Mn4+ could be a promising red phosphor for near ultraviolet (n-UV) based warm pc-WLEDs.

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Держатели документа:
Engineering Research Center of Nano-Geomaterials, Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, China
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong, 529020, China

Доп.точки доступа:
Xing, G.; Feng, Y.; Pan, M.; Wei, Y.; Li, G.; Dang, P.; Liang, S.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Cheng, Z.; Lin, J.
}
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    The crystal structure and luminescence properties of a novel green-yellow emitting Ca1.5Mg0.5Si1-xLixO4- δ:Ce3+ phosphor with high quantum efficiency and thermal stability / W. Ji [et al.] // Dalton Trans. - 2018. - Vol. 47, Is. 29. - P. 9834-9844, DOI 10.1039/c8dt02241k. - Cited References: 42 . - ISSN 1477-9226
   Перевод заглавия: Кристаллическая структура и люминесцентные свойства нового, излучающего зеленый свет люминофора Ca1.5Mg0.5Si1-xLixO4-δ:Ce3+ , с высокой квантовой эффективностью и термической стабильностью
Аннотация: A novel green-yellow emitting Ca1.5Mg0.5Si1−xLixO4−δ:Ce3+ phosphor with high quantum efficiency and thermal stability was discovered for applications in near ultraviolet pumped white light-emitting diodes. Its crystal structure was determined with a single-particle diagnosis approach. The Si sites in the SiO4 tetrahedra are reported for the first time to accommodate Li+ ions. This substitution, confirmed by 6Li solid-state NMR and T.O.F. neutron powder diffraction, causes a disordered occupation of Ca/Mg in the Ca3MgSi2O8 host and favors a phase transformation at ∼330 °C, which results in the formation of the novel phosphor. The produced phosphor was efficiently excited by near UV light peaking at 365 and 410 nm and produced broad green-yellow emission with peaks at 500 and 560 nm, respectively. Its quantum efficiency reached 88.4% (internal) and 55.7% (external) under excitation at 365 nm, and 80.5% (internal) and 42.7% (external) under excitation at 410 nm, while the decrease of luminescence intensity at 200 °C was small (∼26%). A WLED lamp with a high color rendering index of Ra = 92.8 was produced with the combination of a 365 nm emitting chip with blue emitting BaMgAl10O17:Eu2+, green-yellow emitting CMSL:0.01Ce, and red emitting Sr2Si5N8:Eu2+ phosphors.

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Держатели документа:
Chinese Academy of Sciences, Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, China
Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
School of Energy Science and Engineering, University of Electronic Science of China, 2006 Xiyuan Road, Chengdu, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center, KSC, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Department of Materials Science and Engineering, University of Ioannina, Ioannina, Greece
State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing, China
Department of Nuclear Physics, China Institute of Atomic Energy, Beijing, China
STFC-RAL, ISIS Facility Harwell Science and Innovation Campus, Didcot, United Kingdom

Доп.точки доступа:
Ji, W.; Xia, Z.; Liu, K.; Ali Khan, S.; Hao, L.; Xu, X.; Yin, L.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Agathopoulos, S.; Yang, W.; Ma, X.; Sun, K.; Da Silva, I.
}
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Thermoelectric properties and cost optimization of spark plasma sintered n-type Si0.9Ge0.1 - Mg2Si nanocomposites / A. Usenko [et al.] // Scripta Mater. - 2018. - Vol. 146. - P. 295-299, DOI 10.1016/j.scriptamat.2017.12.019. - Cited References: 28. - This work was supported by Russian Science Foundation (project No. 16-13-00060). Part of the work (structural characterization of the samples) was carried out with financial support of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST “MISiS”. Partial support by Act 211 Government of the Russian Federation, contract # 02.A03.21.0011, is also acknowledged. . - ISSN 1359-6462
Кл.слова (ненормированные):
Cost optimization -- Lattice thermal conductivity -- Magnesium silicides -- Spark plasma -- Thermo-Electric materials -- Thermoelectric figure of merit -- Thermoelectric performance -- Thermoelectric properties
Аннотация: We report on thermoelectric properties of low Ge content n-type Si0.9Ge0.1–Mg2Si nanocomposite. Introduction of the Mg2Si phase into a SiGe matrix resulted in a dramatic drop of the lattice thermal conductivity beyond the previously reported lowest limit for SiGe alloys due to intensification of phonon scattering on SiGe–Mg2Si grain boundaries. For a sample doped with 1 at.% of Mg2Si, the peak value of thermoelectric figure of merit ZT reached ~ 0.8 at 800 °C. Sintered nanocomposites still exhibit high thermoelectric performance while being almost two times cheaper than Si0.8Ge0.2.

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Держатели документа:
National University of Science and Technology “MISiS”, Moscow, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
National Research South Ural State University, Chelyabinsk, Russian Federation

Доп.точки доступа:
Usenko, A.; Moskovskikh, D.; Korotitskiy, A.; Gorshenkov, M.; Zakharova, E.; Fedorov, A. S.; Федоров, Александр Семенович; Parkhomenko, Y.; Khovaylo, V.
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10.

    Facile synthesis of the desired red phosphor Li2Ca2Mg2Si2N6:Eu2+ for high CRI white LEDs and plant growth LED device / X. Yang [et al.] // J. Am. Ceram. Soc. - 2020. - Vol. 103, Is. 3. - P. 1773-1781, DOI 10.1111/jace.16858. - Cited References: 34. - National Natural Science Foundations of China, Grant/Award Number: 21671070 and 51802101; Project GDUPS; Natural Science Foundation of Guangdong Province, Grant/Award Number: 2018A030310217; Guangzhou Science & Technology Project, Grant/Award Number: 201704030086; Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams; National Undergraduate Innovation and Entrepreneurship Training Program granted for Gening Xie, Grant/Award Number: 201910564035 . - ISSN 0002-7820. - ISSN 1551-2916
   Перевод заглавия: Простой синтез красного люминофора Li2Ca2Mg2Si2N6: Eu2+, необходимого для белых светодиодов с высоким CRI, и светодиодных устройств для роста растений

РУБ Materials Science, Ceramics
Рубрики:
IN-GLASS
   LUMINESCENCE
   PERFORMANCE
   EFFICIENT
   EMISSION
   ROUTE
Кл.слова (ненормированные):
high CRI white LEDs -- Li2Ca2Mg2Si2N6:Eu2+ -- phosphor -- plant growth LED device
Аннотация: The red emission with suitable peak wavelength and narrow band is acutely required for high color rendering index (CRI) white LEDs without at the cost of the luminous efficacy. Herein, the Li2Ca2Mg2Si2N6:Eu2+ red phosphor was prepared with facile solid‐state method using Ca3N2, Mg3N2, Si3N4, Li3N, and Eu2O3 as the safety raw materials under atmospheric pressure for the first time, which shows red emission peaking at 638 nm with full width at half maximum (FWHM) of 62 nm under blue light irradiation and becomes the desired red phosphor to realize the balance between luminous efficacy and high CRI in white LEDs. The morphology, structure, luminescence properties, thermal quenching behavior, and chromaticity stability of the Li2Ca2Mg2Si2N6:Eu2+ phosphor are investigated in detail. Concentration quenching occurs when the Eu2+ content exceeds 1.0 mol%, whereas high‐temperature photoluminescent measurements show a 32% drop from the room‐temperature efficiency at 423 K. In view of the excellent luminescence performances of Li2Ca2Mg2Si2N6:Eu2+ phosphor, a white LEDs with CRI of 91 as a proof‐of‐concept experiment was fabricated by coating the title phosphor with Y3Al5O12:Ce3+ on a blue LED chip. In addition, the potential application of the title phosphor in plant growth LED device was also demonstrated. All the results indicate that Li2Ca2Mg2Si2N6:Eu2+ is a promising red‐emitting phosphor for blue LED‐based high CRI white LEDs and plant growth lighting sources.

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Держатели документа:
South China Agr Univ, Coll Hort, Guangzhou, Guangdong, Peoples R China.
South China Agr Univ, Coll Mat & Energy, Guangdong Prov Engn Technol Res Ctr Opt Agr, Guangzhou 510642, Guangdong, Peoples R China.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk, Russia.

Доп.точки доступа:
Yang, Xiang; Zhang, Y.u.; Zhang, Xuejie; Chen, Jian; Huang, Haisen; Wang, Dongsheng; Chai, Xirong; Xie, Gening; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhang, Haoran; Liu, Yingliang; Lei, Bingfu
}
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