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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gai S. J., Zhou C., Peng L., Wu M. H., Gao P. X., Su L. J., Molokeev M. S., Zhou Z., Xia M.
Заглавие : A novel Cr3+-doped stannate far red phosphor for plant lighting: structure evolution, broad-narrow spectrum tuning and application prospect
Место публикации : Mater. Today Chem. - 2022. - Vol. 26. - Ст.101107. - ISSN 24685194 (ISSN), DOI 10.1016/j.mtchem.2022.101107
Примечания : Cited References: 50. - The authors would like to gratefully acknowledge funds from the National Natural Science Foundation of China (Grant No. 51974123), the Distinguished Youth Foundation of Hunan Province (Grant No.2020JJ2018), the Key R & D projects in Hunan Province (2020WK2016, 2020SK2032, 2021SK2047, 2022NK2044), the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ40261), the Hunan High Level Talent Gathering Project (2019RS1077&2020RC5007), the Scientific Research Fund of Hunan Provincial Education Department (19C0903), the Natural Sciences Foundation of Hunan Agricultural University, China (Grant No. 19QN11), Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Resource Utilization Science Foundation (19KFXM12), Changsha Science and technology plan (KH2005114 and KH2201428), the Hunan Graduate Scientific Research Innovation Project (2022XC017) and the College Students' Innovative Training (S202110537012 and s202210537079x)
Аннотация: Chemical unit cosubstitution is an effective strategy to regulate the luminescence properties of phosphors, and it has attracted huge attention in the last few years. Following the design principles of the match of effective ion radius, atomic valence equilibrium and stoichiometric substitution, the local structure of crystal can be well customized, which is beneficial to develop high-performance luminescent materials. In this work, Mg2+-Sn4+ sites were cosubstituted by Zn2+-Ti4+ ion pairs in Mg2SnO4: Cr3+, respectively, and the emission spectra was successfully serially tuned from broad-band to narrow-band along with a unique variation trend of blue shift first and then slightly red shift. The photoluminescence excitation (PLE), photoluminescence (PL) spectra, lifetime decay, Raman spectra and electron paramagnetic resonance (EPR) were used to analyze the mechanism of luminescence tuning. Based on the manipulation of local structure, the as-observed distinct luminescence tuning can be well understood by the crystal field theory, nephelauxetic effect and changed Cr3+ capacity in this phosphor. Moreover, the adjusted narrow-band far-red emission spectra peak at 732 nm, matching the characteristic absorption of plant phytochrome PFR, has broad application prospects in the field of plant growth lighting. In addition, light-regulated dwarf potted tomato experiments were carried out to verify the application of far-red light in plant growth.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Novikova G. V., Tsyplenkova D. I., Kuzubov A. A., Kolenchukova O. A., Samoilo A. S., Vorobyev S. A.
Заглавие : Complex of ceftriaxone with Mg(II): Synthesis, structure, spectral and antibacterial properties
Колич.характеристики :11 с
Место публикации : J. Sib. Fed. Univ. Chem. - 2023. - Vol. 16, Is. 1. - P.5-15. - ISSN 19982836 (ISSN); Журн. СФУ. Химия. - ISSN 23136049 (eISSN)
Примечания : Cited References: 28. - The research was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, project number 20–43–240007
Аннотация: Magnesium complex of ceftriaxone was obtained and characterized by atomic-emission and elemental analysis, TGA, FTIR and Raman spectroscopy, X-ray diffraction and density functional theory calculations. Ceftriaxone was coordinated to the magnesium ion by the oxygen of the triazine cycle in the 6th position, the nitrogen of the amine group of the thiazole ring, and oxygen atoms of the lactam carbonyl and carboxylate groups. The disodium salt of ceftriaxone and magnesium complex were screened for antibacterial activity against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa.Получен и охарактеризован магниевый комплекс цефтриаксона методами атомно-эмиссионного и элементного анализов, ТГА, ИК- и КР‑спектроскопии, РФА и расчетов теории функционала плотности. Цефтриаксон координируется к иону магния через кислород триазинового цикла в шестом положении, азот аминогруппы тиазольного цикла и атомы кислорода карбоксильной и лактамной групп. Динатриевая соль цефтриаксона и комплекс магния были исследованы на антибактериальную активность в отношении Staphylococcus aureus, Escherichia coli и Pseudomonas aeruginosa.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Platunov M. S., Knyazev Yu. V., Ivanova N. B., Zubavichus Y. V., Veligzhanin A. A., Vasiliev A. D., Bezmaternykh L. N., Bayukov O. A., Arauzo A., Bartolome J., Lamonova K. V., Ovchinnikov S. G.
Заглавие : Crystal and local atomic structure of MgFeBO4,Mg0.5Co0.5FeBO4, and CoFeBO4: effects of Co substitution
Место публикации : Phys. Status Solidi B. - 2015. - Vol. 252, Is. 10. - P.2245-2258. - ISSN 0370, DOI 10.1002/pssb.201552143. - ISSN 15213951 (eISSN)
Примечания : Cited References: 46. - This work has been financed by the MECOM Project MAT11/23791, and DGA IMANA project E-34, Council for Grants of the President of the Russian Federation (project nos. NSh-2886.2014.2, SP-938.2015.5), and Russian Foundation for Basic Research (project nos. 13-02-00958-a, 13-02-00358-a, 14-02-31051-mol-a). The work of one of the coauthors (M.S.P.) was supported by the program of Foundation for promoting the development of small enterprises in scientific and technical sphere ("UMNIK" program).
Предметные рубрики: SPIN-GLASS BEHAVIOR
MAGNETIC WARWICKITES
SINGLE-CRYSTALS
PHASE-RELATIONS
OXYBORATE
SYSTEM
SPECTROSCOPY
ANISOTROPY
MN2OBO3
FE2OBO3
Ключевые слова (''Своб.индексиров.''): crystal structure--xanes--exafs--magnetic semiconductor--oxyborate
Аннотация: Single-crystalline MgFeBO4, Mg0.5Co0.5FeBO4, and CoFeBO4 have been grown by the ﬂux method. The samples have been characterized by X-ray spectral analysis, X-ray diffraction, and X-ray absorption spectroscopy. The X-ray absorption near-edge structure (XANES) and extended X-ray absorption ﬁne structure (EXAFS) spectra have been measured at the Fe and Co K-edges over a wide temperature range (6.5– 300 K). The composition, the charge state, and local environ- ment of both Fe and Co atoms have been determined. The effects of Co substitution for Mg on the local structural distortions have been revealed experimentally and the M–O bond anisotropy has been found.Монокристаллические образцы CoFeBO4 были выращены раствор-расплавным методом. Образцы были охарактеризованы с помощью рентгеноспектрального анализа, рентгеновской дифракции и спектроскопии поглощения рентгеновских лучей. Спектры вблизи K-края поглощения рентгеновского излучения структуры (XANES) и далее рентгеновского поглощения тонкой структуры (EXAFS) были измерены для Fe и Co в широком диапазоне температур (6.5- 300К). Состав, состояние заряда, и локальная положение и Fe и Co атомов были определены. Эффекты замещения Co магнием Mg на местные структурные искажения были выявлены экспериментально и анизотропия связи М-О была найдена.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Мошкина, Евгения Михайловна, Гаврилова Т. П., Князев, Юрий Владимирович, Платунов, Михаил Сергеевич, Чумаков Р. Г., Бельская, Надежда Алексеевна, Чернышев А. В.
Заглавие : Cинтез катионно-упорядоченных mn-mg оксиборатов, обладающих дальним магнитным порядком [Электронный ресурс]
Коллективы : "Фундаментальные исследования молодых ученых Енисейской Сибири", отчетная конференция, Федеральный исследовательский центр "Красноярский научный центр Сибирского отделения Российской академии наук", Сибирский федеральный университет, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : II Отчетная конференция "Фундаментальные исследования молодых ученых Енисейской Сибири": сборник материалов. - 2019. - С. 52-53. - ISBN 978-5-6042995-4-8
Вид и объем ресурса: Электрон. текстовые дан.
Примечания : Библиогр.: 1
Материалы конференции,
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev, Yu. V., Kazak N. V., Platunov M. S., Ivanova N. B., Bezmaternykh L. N., Arauzo A., Bartolome J., Ovchinnikov S. G.
Заглавие : Disorder- and correlation-induced charge carriers localization in oxyborate MgFeBO4, Mg0.5Co0.5FeBO4, CoFeBO4 single crystals
Место публикации : J. Alloys Compd.: Elsevier Science, 2015. - Vol. 642. - P.232-237. - ISSN 0925, DOI 10.1016/j.jallcom.2015.04.056. - ISSN 18734669(eISSN)
Примечания : Cited References:32. - This work has been financed by Council for Grants of the President of the Russian Federation (Project Nos. NSh-2886.2014.2, SP-938.2015.5), Russian Foundation for Basic Research (Project Nos. 13-02-00958-a, 13-02-00358-a, 14-02-31051-mol-a). The work of one of coauthors (M.S.P.) was supported by the grant of KSAI "Krasnoyarsk Regional Fund of Supporting Scientific and Technological Activities'' and by the Program of Foundation for Promoting the Development of Small Enterprises in Scientific and Technical Sphere ("UMNIK'' program). Financial support from the Spanish MINECO MAT11/23791 and DGA IMANA project E-34 is acknowledged.
Предметные рубрики: WARWICKITE
Fe2OBO3
FeBO3
Ключевые слова (''Своб.индексиров.''): transition metal alloys and compounds--disordered system--semiconductors--electrical transport
Аннотация: The temperature dependence of the resistivity of single crystalline Mg1−xCoxFeBO4 samples with x = 0.0, 0.5, 1.0 is investigated for the temperature range (210–400 K). The conduction was found to be governed by Mott variable-range hopping (VRH) in the low-temperature range (T = 210–270 K) and by thermo-activation mechanism in the high-temperature range (T = 280–400 K). Microscopic electronic parameters, such as the density of the localized states near the Fermi level, localization length, the hopping length, and the activation energy have been obtained. The change of the activation energy observed at high-temperature range was attributed to local structure distortions around Fe and Co atoms. The complicated behavior of charge transfer mechanisms is discussed based on two approaches: atomic disorder and electron correlations.Температурная зависимость сопротивления монокристаллических образцов Mg1- XCoxFeBO4 с х = 0,0; 0.5, 1.0 исследована в интервале температур (210-400 К). Было установлено, что проводимость регулируется Мотт-переменной длиной прыжка (VRH) в области низких температур (T = 210-270 К) и термо-активационным механизмом в области высоких температур (Т = 280-400 К). Микроскопические электронные параметры, такие как плотность локализованных состояний вблизи уровня Ферми, длины локализации, длина прыжка, и энергия активации были получены. Изменение энергии активации наблюдается при высокой температурном Диапазоне, что было связано с локальными искажениями структуры вокруг Fe и Co атомов. Сложный механизм поведения переноса заряда обсуждается на основе двух подходов: атомный беспорядок и электронная корреляция.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Горев, Михаил Васильевич, Aleksandrov K. S., Afanasyev M. L.
Заглавие : Effect of hydrostatic pressure on phase transitions in ABF 6.6H2 crystals (A identical to Zn,Co,Mg,Mn,Fe:B identical to Ti,Si)
Место публикации : Journal of Physics: Condensed Matter. - 1992. - Vol. 4, Is. 1. - Ст.020. - P.91-99. - ISSN 0953-8984, DOI 10.1088/0953-8984/4/1/020
Аннотация: The effect of hydrostatic pressure on structural phase transitions in some fluorotitanates and fluorosilicates of the ABF6.6H2O family is studied. It is shown that it is possible to divide the crystals of this family into two groups differing from each other in their values of entropy change and shifts of the phase transition temperature T0 under pressure. In some compounds the high-pressure phases and triple points were established. The phase diagram for FeSiF6.6H2O can be considered as a unified diagram describing the possible phase transitions in the crystals studied. The effect of deuteration is investigated in different phases.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yang, Xiang, Zhang, Y.u., Zhang, Xuejie, Chen, Jian, Huang, Haisen, Wang, Dongsheng, Chai, Xirong, Xie, Gening, Molokeev M. S., Zhang, Haoran, Liu, Yingliang, Lei, Bingfu
Заглавие : Facile synthesis of the desired red phosphor Li2Ca2Mg2Si2N6:Eu2+ for high CRI white LEDs and plant growth LED device
Место публикации : J. Am. Ceram. Soc. - 2020. - Vol. 103, Is. 3. - P.1773-1781. - ISSN 0002-7820, DOI 10.1111/jace.16858. - ISSN 1551-2916(eISSN)
Примечания : 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
Предметные рубрики: IN-GLASS
LUMINESCENCE
PERFORMANCE
EFFICIENT
EMISSION
ROUTE
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Leano J. L., Lin S. -Y., Lazarowska A., Mahlik S., Grinberg M., Liang C., Zhou W., Molokeev M. S., Atuchin V. V., Tsai Y. -T., Lin C. C., Sheu H. -S., Liu R. -S.
Заглавие : Green light-excitable Ce-doped nitridomagnesoaluminate Sr[Mg2Al2N4] phosphor for white light-emitting diodes
Место публикации : Chem. Mater.: American Chemical Society, 2016. - Vol. 28, Is. 19. - P.6822-6825. - ISSN 08974756 (ISSN), DOI 10.1021/acs.chemmater.6b03442
Примечания : Cited References: 11. - This work was supported by the Ministry of Science and Technology of Taiwan (Contract Nos. MOST 104-2113-M-002-012-MY3, MOST 104-2119-M-002-027-MY3, MOST 104-2923-M-002-007-MY3); the National Center for Research and Development Poland Grant (No. PL-TW2/8/2015). The contribution of S.M. was supported by the grant “Iuventus Plus” 0271/IP3/2015/73 from Ministry of Science and Higher Education, Poland, and the Russian Foundation for Basic Research (15-52-53080). We also acknowledge the financial support from the Epistar Company. Further details of the crystal structure may be obtained from Fachinformationszentrum Karlsruhe, 76344 Eggenstein-Leopoldshafen, Germany (Fax: (+49)7247-808-666; E-mail: crystdata@fiz-karlsruhe.de; http://www.fiz-karlsruhe.de/request_for_deposited_data.html on quoting the deposition number: CSD-431335.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grossman V. G., Molokeev M. S., Bazarova J. G., Bazarov B. G.
Заглавие : High ionic conductivity of K5-xTlx(Mg0.5Hf1.5)(MoO4)6 (0 ≤ х ≤ 5) solid solutions
Место публикации : Solid State Sci. - 2022. - Vol. 134. - Ст.107027. - ISSN 12932558 (ISSN), DOI 10.1016/j.solidstatesciences.2022.107027
Примечания : Cited References: 39. - The work was supported by Basic Project of BINM SB RAS №0273-2021-0008. Structural analysis of materials in this study was partly supported by the Research Grant No. 075-15-2019-1886 from the Government of the Russian Federation . X-ray powder diffraction and thermal analysis were obtained using the equipment of the Collective Use Center BINM SB RAS
Аннотация: Novel K5-xTlx(Mg0.5Hf1.5)(MoO4)6 (0 ≤ х ≤ 5) oxides were successfully synthesized by solid state reaction. The results indicate the formation of a continuous series of solid solutions with the NASICON-like structure (sp. gr. R3¯c) in the composition range 0 x 5. The unit-cell parameters of the solid solutions increase linearly with composition, as a consequence of thallium substitution for potassium. The cation conductivity of Tl5Mg0.5Hf1.5(MoO4)6 has been shown to exceed the conductivity of the parent potassium magnesium hafnium molybdate. The highest total conductivity of 2.49 × 10−3 S/cm was found at 831 K for Tl5Mg0.5Hf1.5(MoO4)6.
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