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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Александров, Кирилл Сергеевич, Voronov V. N., Vtyurin A. N., Krylov A. S., Molokeev M. S., Pavlovskiy M. S., Goryainov S. V., Lihacheva A. N., Ancharov A. I.
Заглавие : Pressure-indused phase transition in cubic ScF3 crystal
Коллективы : Russia/CIS/Baltic/Japan Symposium on Ferroelectricity
Место публикации : 9th Russai/CIS/Baltic/Japan symposium on ferroelectricity: abstracts book : June 15-19, 2008, Vilnius, Lithuania. - p.116
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Молокеев, Максим Сергеевич, Атучин В. В., Кеслер В. Г., Александров, Кирилл Сергеевич
Заглавие : Химический синтез и электронная структура K3WO3F3
Коллективы : "Методы создания, исследования микро-, наносистем и экономические аспекты микро-, наноэлектроники", Всероссийская научно-техническая конференция
Место публикации : Методы создания, исследования микро-, наносистем и экономические аспекты микро-, наноэлектроники: материалы III Всероссийской научно-технической конференции, г. Пенза, 26-29 мая, 2009/ "Методы создания, исследования микро-, наносистем и экономические аспекты микро-, наноэлектроники", Всероссийская научно-техническая конференция (3 ; 2009 ; май ; Пенза). - Пенза. - С. 99-101. - ISBN 978-5-94170-385-2
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Атучин В. В. , Гаврилова Т. А., Кеслер В. Г. , Молокеев, Максим Сергеевич, Александров, Кирилл Сергеевич
Заглавие : Низкотемпературный химический синтез, морфология и электронная структура микрокристаллов K3WO3F3
Коллективы : Интитут геологии УрО РАН, Минералогическая интервенция в микро- и наномир, Российское минералогическое общество
Место публикации : Минералогическая интервенция в микро- и наномир: материалы Международного минералогического семинара, Сыктывкар, Республика Коми, Россия, 9-11 июня 2009 г. - С. 427-428. - ISBN 978-5-98491-035-4
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Абрамова, Галина Михайловна, Фрейдман, Александр Леонидович, Скоробогатов, Станислав Алексеевич, Воротынов, Александр Михайлович, Жарков, Сергей Михайлович, Молокеев, Максим Сергеевич, Панкрац, Анатолий Иванович
Заглавие : Спин-флоп-переход, индуцирующий магнитострикционные и магнитодиэлектрические аномалии в монокристалле α -MnS
Колич.характеристики :8 с
Место публикации : Журн. эксперим. и теор. физ. - 2024. - Т. 165, Вып. 3. - С. 396-403. - ISSN 00444510 (ISSN), DOI 10.31857/S004445102403009X
Примечания : Библиогр.: 41. - Авторы благодарны О. А. Баюкову и Д. А. Балаеву за плодотворное обсуждение экспериментальных результатов, а также центру коллективного пользования ФИЦ КНЦ за предоставленную возможность выполнения экспериментальных работ
Аннотация: В магнитных полях до 90 кЭ в температурном диапазоне 4.2–300 К выполнены экспериментальные исследования магнитных и магнитострикционных свойств монокристалла альфа-моносульфида марганца (α-MnS) с кубической (NaCl-типа) структурой. Обнаружены аномалии в полевых зависимостях намагниченности и продольной магнитострикции, коррелирующие с поведением диэлектрической проницаемости вещества. Установлено, что в области температур ниже 130 К при изменении магнитного поля наблюдается магнитный переход типа спин-флоп (Hsf ∼ 50 –70 кЭ), обусловленный магнитной анизотропией в плоскости легкого намагничивания. Изотермические исследования продольной магнитострикции и относительного изменения диэлектрической проницаемости при этих же температурах показали, что обе характеристики достигают значений порядка 10−3 в полях 50 –70 кЭ, испытывая аномалии при спинфлоп-переходе.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Udod L. V., Aplesnin S. S., Zelenov F. V., Sitnikov M. N., Molokeev M. S., Romanova O. B.
Заглавие : Enhancement of the magnetoelectric effect in the Bi2Fe4O9/BiFeO3 composite as a result of dipole and migration polarization in mullite
Колич.характеристики :13 с
Место публикации : J. Mater. Sci. - 2024. - Vol. 59, Is. 24. - P.10763-10775. - ISSN 00222461 (ISSN), DOI 10.1007/s10853-024-09885-x. - ISSN 15734803 (eISSN)
Примечания : Cited References: 55
Аннотация: The effect of the size of Bi2Fe4O9 and BiFeO3 nanoparticles on the magnetoelectric interaction in the Bi2Fe4O9/BiFeO3 composite with a percentage ratio of 67/33 has been studied. The electrostriction and electric polarization on electric and magnetic field in wide temperature range has been measured. The hysteresis of the polarization and I?V characteristics has been found. Temperature ranges with activation and hopping types of conductivity have been found. The mechanism of electric polarization and the crossover temperature from dipole polarization to migration polarization at 260 K have been established. Linear and quadratic contributions to the magnetoelectric effect have been found. Below 120 K the linear contribution is an order of magnitude greater than the quadratic contribution and above 240 K the quadratic contribution to the ME effect prevails. Models have been proposed to explain the enhancement of the magnetoelectric effect as a result of the migration polarization in mullite and linear magnetoelectric effect in bismuth ferrite. The correlation of temperatures of the extremum of the temperature coefficient of the electrical resistance and the magnetic phase transition in mullite at 260 K indicates a polaron-type conductivity and a strong electron?phonon interaction. A change in the sign of the electrostriction coefficient upon heating and the compression temperature of the composite in an electric field was found.
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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) : Grigoriev, Maxim V., Ruseikina, Anna V., Molokeev M. S., Chernyshev, Vladimir А., Aleksandrovsky A. S., Krylov A. S., Krylova S. N., Shestakov N. P., Velikanov D. A., Garmonov, Alexander A., Matigorov, Alexey V., Ostapchuk, Evgeny A., Schleid, Thomas, Safin, Damir A.
Заглавие : Elucidating elusive quaternary selenide EuCeCuSe3: Synthesis, crystal structure, properties and theoretical studies
Колич.характеристики :9 с
Место публикации : J. Rare Earths. - 2024. - Vol. 42, Is. 1. - P.163-171. - ISSN 10020721 (ISSN), DOI 10.1016/j.jre.2022.11.004. - ISSN 25094963 (eISSN)
Примечания : Cited References: 47
Аннотация: We report on the novel heterometallic quaternary selenide EuCeCuSe3, the fabrication of which has been a challenge until this work. The structure of the reported selenide was elucidated from the powder X-ray diffraction data, which revealed the formation of EuCeCuSe3 with excellent yield (96.7%) accompanied with a minor fraction of CeSe2 (3.3%), and was best solved in orthorhombic space group Pnma with the BaLaCuS3 structural type. Thus, the crystal structure of the title compound completes the row of the heterometallic quaternary selenides EuRECuSe3 (RE = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y), of which the cerium-based derivative exclusively belongs to the BaLaCuS3 structural type. The distortion of the CuSe4 polyhedron was compared for the whole series of EuRECuSe3 compounds using the τ4-descriptor for four coordinated ions, which revealed the highest degree of distortion for the Ce3+-containing selenide, followed by the La3+-based derivative. Furthermore, the crystallographic and geometrical parameters of the reported selenide were discussed in comparison to the Ce3+-based sulfides SrCeCuS3 and EuCeCuS3. Ab initio calculations of the crystal structure, a phonon spectrum and elastic constants for the crystal of EuСeCuSe3 were also performed. The types and wavenumbers of fundamental modes were determined and the involvement of ions participating in the phonon modes was assessed. The experimental IR spectrum of the reported selenide was interpreted and found to be in agreement with the calculated spectrum. The experimental direct band gap of EuCeCuSe3 was measured to be 1.36 eV that is consistent with the concept of its origin due to interband transitions between orbitals emerging mainly from 4f (valence band) and 5d (conduction band) levels of the Eu2+ cation. The dependence of the Young's modulus on the direction demonstrates the anisotropy of the elastic properties, while the Vickers hardness for EuCeCuSe3 was calculated to be 5.2 GPa. Finally, the title compound is paramagnetic above 4 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ouyang Sh., Yin J., Su L., Yao M., Wang G., Yang J., Molokeev M. S., Zhou Zh., Zhang S., Xia M.
Заглавие : Highly efficient and thermostable far-red phosphor for promoting root growth in plants
Колич.характеристики :8 с
Место публикации : J. Mater. Chem. C. - 2024. - Vol. 12, Is. 9. - P.3272-3279. - ISSN 20507526 (ISSN), DOI 10.1039/D3TC02823B. - ISSN 20507534 (eISSN)
Примечания : Cited References: 59. - The authors would like to gratefully acknowledge funds from the National Natural Science Foundation of China (Grant No. 51974123), the Key R&D Projects in Hunan Province (2021SK2047, 2022NK2044), the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ40261), the Wangcheng Science and Technology Plan (KJ221017), the Science and Technology Innovation Program of Hunan Province (2022WZ1022) and Superior Youth Project of the Science Research Project of Hunan Provincial Department of Education, (22B0211) and the Russian Federation as part of World-class Research Center Program: "Advanced Digital Technologies", contract no. 075-15-2020-935
Аннотация: Phytochrome PFR plays a key role in plant photomorphogenesis, and its perception of far-red light is essential, but how to obtain an efficient far-red phosphor to achieve accurate light filling remains a huge challenge. In this study, Gd1−y−zAl3−x(BO3)4:xCr3+,yLu3+,zSm3+ (GAB:xCr3+,yLu3+,zSm3+) series phosphors were synthesized by a high-temperature solid-state method. By doping Lu3+, the emission intensity of Cr3+ could increase as high as 20%. With the introduction of Sm3+, the emission intensity of Cr3+ was further increased by 29%. Particularly, the emission spectra can be tuned by varying the concentration ratio of Sm3+ and Cr3+, more suitable for the absorption spectrum of PFR. Moreover, the internal quantum yield and external quantum yield of GL0.1AB:0.03Cr3+ and GL0.1AB:0.03Cr3+,0.003Sm3+ were 83.1% and 24.7% and 78.1% and 26.3%, respectively. There were high anti-thermal quenching properties in the prepared phosphors at 423 K, with 107.6% (GAB:0.03Cr3+), 103.1% (GL0.1AB:0.03Cr3+), and 102.7% (GL0.1AB:0.003Sm3+,0.03Cr3+). Finally, the phosphors were made into pc-LED devices, which can realize the adjustable orange-red and far-red luminescence and meet the needs of plant lighting applications. In the light-regulated plant growth experiment, compared with the control group, far-red light promoted root growth in plants, confirming the application potential of the prepared phosphors in indoor plant cultivation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dai X., Zou X., Zhang H., Chen W., Yang C., Molokeev M. S., Xia Z., Liu Y., Zhang X., Zheng M., Lei B.
Заглавие : Novel Cr3+-doped garnet phosphor with broadband efficient far-red emission for photochrome matching plant-lighting
Колич.характеристики :9 с
Место публикации : Adv. Opt. Mater. - 2024. - Vol. 12, Is. 11. - Ст.2302380. - ISSN 21951071 (eISSN), DOI 10.1002/adom.202302380
Примечания : Cited References: 54. - 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: Cr3+-doped phosphors are highly recognized in various fields for their remarkable luminous efficiency and spectral flexibility, including modern agriculture and horticulture. However, the shortage of suitable Cr3+-doped phosphors for far-red LED devices has inhibited their popularization in plant lighting. Herein, an innovative Cr3+-doped phosphor Ca2YAl3Ge2O12:Cr3+ (CYAG:Cr3+), achieving a broad far-red emission at 770 nm upon 450 nm blue light excitation is designed. The optimal CYAG:Cr3+ phosphor exhibits a high internal quantum yield of 78.2% and low thermal-quenching behavior of 85%@373 K. Thus, the fabricated phosphor-converted LEDs (pc-LEDs) for plant far-red lighting have a high output power of 33.3 mW and photovoltaic conversion efficiency of 11.5% at 100 mA. The potential of CYAG:Cr3+ in plant lighting is assessed by supplementing the far-red lighting of Italian lettuce with fabricated pc-LEDs, and the biomass of Italian lettuce is significantly increased by 33%. The successful development of CYAG:Cr3+ phosphors provides a high-quality option for plant far-red light devices and further stimulates the development of new Cr3+-doped plant-lighting phosphors.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tikhomirov A. A., Molokeev M. S., Velichko V. V.
Заглавие : Photo-biological effectiveness of PAR for radish plant communities irradiated using an LED source with an adjustable spectrum
Колич.характеристики :8 с
Место публикации : Light Eng. - 2024. - Vol. 32, Is. 2. - P.70–77. - ISSN 02362945 (ISSN), DOI 10.33383/2023-063. - ISSN 25419935 (eISSN)
Примечания : Cited References: 15. - The study was carried out with financial support within the framework of State Assignment 121101300066-7 of the Ministry of Education and Science and the Strategic Academic Leadership Program "Priority-2030" for the Siberian Federal University
Аннотация: The aim of the current study was to find the most effective spectral modes of irradiation of short-season plants (for example, radish) using a fluorescent LED irradiator with a variable spectrum. The research methodology was based on the species-specific response of plants to the spectral composition of light. Photo-biological experiments were carried out to find effective spectral composition of PAR for cultivating radish communities under stable and variable irradiation modes of electrical lighting. It was shown that under stable irradiation modes, the highest productivity of economically useful radish biomass had been achieved at spectral composition with a maximum of 60 % radiation in the (600–700) nm region in a variable spectral irradiation mode. The variable spectral irradiation mode turned out to be the most effective when the spectral composition with the dominance of red rays was changed to the spectral composition with the dominance of blue rays. There were no significant differences between the best production parameters for stable and variable modes of irradiation of radish plants, which indicates the expediency of choosing the stable spectral mode of irradiation of radish plants as a short-season crop under electrical illumination. The results obtained can be used to select spectral irradiation modes for short-season plants grown under electrical lighting in northern regions and in isolated rooms in various climatic zones using "City-farm" technologies.
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