Библиотека института физики им. Л.В. Киренского СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kawamata T., Sugawara N., Haidar S. M., Adachi T., Noji T., Kudo K., Kobayashi N., Fujii Yu., Kikuchi H., Chiba M., Petrakovskii G. A., Popov M. A., Bezmaternykh L. N., Koike Yo.
Заглавие : Thermal conductivity and magnetic phase diagram of CuB2O4
Место публикации : J. Phys. Soc. Jpn. - 2019. - Vol. 88, Is. 11. - Ст.114708. - ISSN 0031-9015 (ISSN), DOI 10.7566/JPSJ.88.114708. - ISSN 1347-4073 (eISSN)
Примечания : Cited References: 42. - This work was supported by a Grant-in-Aid for Scientific Research of the Ministry of Education, Culture Sports, Science and Technology, Japan, (Grant Number 17038002) and also by CREST of Japan Science and Technology Corporation.
Аннотация: We have measured temperature and magnetic field dependences of the thermal conductivity along the c-axis, κc, and that along the [110] direction, κ110, of CuB2O4 single crystals in zero field and magnetic fields along the c-axis and along the [110] direction. It has been found that the thermal conductivity is nearly isotropic and very large in zero field and that the thermal conductivity due to phonons is dominant in CuB2O4. The temperature and field dependences of κc and κ110 have markedly changed at phase boundaries in the magnetic phase diagram, which has been understood to be due to the change of the mean free path of phonons caused by the change of the phonon-spin scattering rate at the phase boundaries. It has been concluded that thermal conductivity measurements are very effective for detecting magnetic phase boundaries.
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Вид документа : Статья из журнала
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Автор(ы) : Volochaev M. N., Kalinin, Yu E., Kashirin M. A., Makagonov V. A., Pankov, S. Yu, Bassarab V. V.
Заглавие : Structure and Electrical Properties of (ZnO/SiO2)25 Thin Films
Коллективы : Ministry of Science and Higher Education of the Russian Federation [3.1867.2017/4.6]
Место публикации : Semiconductors. - 2019. - Vol. 53, Is. 11. - P.1465-1471. - ISSN 1063-7826, DOI 10.1134/S106378261911023X. - ISSN 1090-6479(eISSN)
Примечания : Cited References: 16. - This study was carried out in the framework of the state assignment of the Ministry of Science and Higher Education of the Russian Federation, project no. 3.1867.2017/4.6.
Предметные рубрики: HETEROSTRUCTURES
Аннотация: (ZnO/SiO2)25 thin-film multilayers consisting of nanocrystalline ZnO layers and amorphous SiO2 spacers with a bilayer thickness from 6 to 10 nm are synthesized in a single deposition process. An analysis of the temperature dependences of the electrical resistivity of (ZnO/SiO2)25 thin films shows that, in the temperature range of 77–300 K, the dominant conductivity mechanism successively changes from hopping conductivity with a variable hopping length in a narrow energy band near the Fermi level at temperatures of 77–250 K to thermally activated impurity conductivity around room temperature. Using the obtained temperature dependences of the electrical resistivity, the effective density of localized states at the Fermi level and the activation energy of impurity levels are estimated. The effect of heat treatment on the structure and electrical properties of the synthesized films is examined. It is established that in (ZnO/SiO2)25 thin-film systems at temperatures of 580–600°C, the ZnO and SiO2 layers chemically interact, which is accompanied by destruction of the multilayer structure and formation of the Zn2SiO4 compound with a tetragonal structure (sp. gr. I-42d).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korotkov L. N., Stekleneva L. S., Flerov I. N., Mikhaleva E. A., Rysiakiewicz-Pasek E., Molokeev M. S., Bondarev I. A., Gorev M. V., Sysoev O. I.
Заглавие : X-Ray, Dielectric, and Thermophysical Studies of Rubidium Tetrachlorozincate inside Porous Glasses
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 9. - P.1072-1076. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873819090132
Примечания : Cited References: 17
Аннотация: Results are presented from studying the X-ray diffraction, heat capacities, dielectric permittivities, and coefficients of the volumetric thermal expansion of composite materials obtained by embedding of Rb2ZnCl4 salt into the porous matrices of borosilicate glass with average pore diameters of 46 and 320 nm in the temperature range of 120–350 K. The temperatures of transitions to the incommensurate and ferroelectric phases are determined, along with the freezing temperature of the mobility of domain boundaries in Rb2ZnCl4 particles. A substantial increase in their Curie temperature is observed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kiselev E. G., Kuzmin A. P., Nemtsev I. V.
Заглавие : Thermal and Mechanical Studies of Biofiller/Poly-3-Hydroxybutyrate Biocomposites
Место публикации : J. Sib. Fed. Univ. Biol. - 2019. - Vol. 12, Is. 3. - P.302-310. - ISSN 1997-1389 (ISSN), DOI 10.17516/1997-1389-0304; Журнал СФУ. Биология. - ISSN 2313-5530 (eISSN)
Примечания : Cited References: 8. - The study was performed using equipment from the Shared Instrument Facility of Federal Research Center “Krasnoyarsk Science Center SB RAS”, 43/50 Akademgorodok, Krasnoyarsk, 660036, Russia.
Аннотация: Biodegradable poly-3-hydroxybutyrate [P(3HB)] and birch wood flour (as filler) were used to prepare powdered blends and then pellets and granules. Pellets were produced by cold pressing of polymer and filler powders; granules were produced from the powders wetted with ethanol. The properties of the initial P(3HB) and filler and the blends thereof were studied using IR spectroscopy, differential scanning calorimetry, X-ray analysis, and electron microscopy. No chemical bonds between the components were revealed; the blends were physical mixtures. The degree of crystallinity of the blends was lower than that of the initial polymer, suggesting different crystallization kinetics of the blends. The introduction of increasing amounts of filler into the polymer progressively decreased the mechanical strength of the pellets, as confirmed by a decrease in Young’s modulus. The resulting composite, based on biodegradable polymers and wood flour, is a promising nontoxic material for the production of wood-based panels for the construction industry and the manufacture of furniture in place of materials produced using toxic polyester resins.Биоразлагаемый поли-3-гидроксибутират [P(3HB)] и березовые опилки (в качестве наполнителя) использованы для приготовления порошкообразных смесей с целью получения форм в виде гранул и таблеток. Таблетки получены прямым холодным прессованием порошков полимера и наполнителя, гранулы - техникой гранулирования из пасты смеси полимера с опилками, увлажненной этанолом. Свойства исходного полимера, наполнителя и полученных смесей изучены с помощью ИК-спектроскопии, дифференциальной сканирующей калориметрии, рентгенографии и электронной микроскопии. Химических связей между компонентами обнаружено не было, следовательно, эти смеси представляют собой физические смеси. Степень кристалличности смесей была ниже, чем у исходного полимера, что свидетельствует о различной кинетике кристаллизации смесей. Увеличение содержания наполнителя в полимере снижало механическую прочность. Полученный на основе биоразлагаемого полимера и опилок композит имеет перспективу в качестве нетоксичного материала для производства древесных плит для стройиндустрии и мебельной промышленности вместо материалов, изготовленных с использованием токсичных полиэфирных смол.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Thomas, Sabu, Shumilova A. A., Kiselev E. G., Baranovsky S. V., Vasiliev A. D., Nemtsev I. V., Kuzmin A. P., Sukovatyi A. G., Avinash, R. Pai, Volova T. G.
Заглавие : Thermal, mechanical and biodegradation studies of biofiller based poly-3-hydroxybutyrate biocomposites
Место публикации : Int. J. Biolog. Macromol. - 2020. - Vol. 155. - P.1373-1384. - ISSN 1879-0003, DOI 10.1016/j.ijbiomac.2019.11.112
Примечания : This study was financially supported by Project “Agropreparations of the new generation: a strategy of construction and realization” (Agreement No 074-02-2018-328) in accordance with Resolution No 220 of the Government of the Russian Federation of April 9, 2010, “On measures designed to attract leading scientists to the Russian institutions of higher learning”.
Аннотация: Biodegradable poly-3-hydroxybutyrate [P(3HB)] and natural fillers - clay, peat, and birch wood flour – were used to prepare powdered composites to form pellets and granules. Pellets were produced by cold pressing of polymer and filler powder whereas granules were produced from the powders wetted with ethanol. Characterization techniques like IR spectroscopy, differential scanning calorimetry, X-ray analysis, mechanical analysis and electron microscopy were employed to study the properties of the initial P(3HB) and fillers and the composites. Analysis of the IR spectra of the composites showed the absence of chemical bonds between the components, i.e. the composites were physical mixtures. Young's moduli of the pellets prepared from initial materials varied considerably, and the highest value was obtained for P(3HB) pellets (350 MPa). Studies of biodegradation of composite pellets and granules in the soil for 35 days showed that the residual mass of the pellets had decreased to 68% for P(3HB); 56.4% for P(3HB)/peat; 67% for P(3HB)/wood flour, and 64% for P(3HB)/clay; granules exhibited a similar mass loss, residual mass of the granules of P(3HB) was 68.4%, P(3HB)/peat 46.4%; P(3HB)/wood flour 77%, and P(3HB)/clay 74%. This shows the significance of the material as an eco-friendly composite without sacrificing its mechanical properties.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Bogdanov E. V.
Заглавие : Conversial and inversial barocaloric effects around triple points in ferroelastics (NH4)3NbOF6 and (NH4)3TiOF5
Коллективы : Journale of Thermal Analysis and Calorimetry Conference, Joint Czech-Hungarian-Polish-Slovakian) Thermoanalytical Conference
Место публикации : 2nd Journale of Thermal analysis and calorimetry conference: book of abstracts. - 2019. - P.489-490. - ISBN 978-963-454-416-6
Примечания : Cited References:. - The reported study was funded by RFBR according to the research project No 18-02-00269
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hao J., Tao M., Gao Z., Chen S., Liu Y., Wang H., Wei Y., Molokeev M. S., Li G.
Заглавие : Enhanced green emission and thermal stability of Ba3Si6O12N2:Eu2+ by Ce3+/P5+-doping: Unity energy transfer, charge compensation and lattice strain release
Место публикации : J. Lumines. - 2020. - Vol. 220. - Ст.116995. - ISSN 00222313 (ISSN), DOI 10.1016/j.jlumin.2019.116995
Примечания : Cited References: 66. - This work is financially supported by the National Natural Science Foundation of China (NSFC No. 51672259 , 51601131 ) and the Fundamental Research Fund for National Universities , China University of Geosciences (Wuhan)
Аннотация: To optimize luminescence properties of oxonitridosilicate phosphors are extremely necessary for improving lighting quality of white light-emitting diodes (WLEDs). Herein, we designed Ce3+, Eu2+ codoping and P5+-Si4+ substitution in the presentative Ba3Si6O12N2:Eu2+ green phosphor to realize an enhancement of luminescence efficiency and thermal stability. Rietveld refinement results of Ce3+, Eu2+, P5+-doped Ba3Si6O12N2 (BSON) confirmed the formation of pure trigonal phase (P-3) of Ba3Si6O12N2 and the successful doping of Ce3+, Eu2+, P5+ ions. Ce3+ and Eu2+ ions randomly occupy two Ba crystallographic sites. Interestingly, a near unity energy transfer (ET, ~100%) from Ce3+ ions to Eu2+ ions is observed. Meanwhile, the doping of P5+ ions into BSON also helps improving the luminescence efficiency and thermal stability, which should be attributed to the charge compensation and the relax of lattice strain. In addition, the white light emitting diodes (WLEDs) fabricated by employing P5+-doped BSON: Eu2+ present a better electroluminescence performance than BSON: Eu2+. This study could serve as a guide in developing optimized oxonitridosilicates phosphors with improved luminescence performances based on complete energy transfer and lattice variations in local coordination environments through cation substitutions, and the as-prepared Ce3+/P5+-codoped Ba3Si6O12N2:Eu2+ could be an excellent green-emitting phosphor for UV-to-Visible LED chips pumped WLEDs.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hu T., Molokeev M. S., Xia Z., Zhang Q.
Заглавие : Aliovalent substitution toward reinforced structural rigidity in Ce3+-doped garnet phosphors featuring improved performance
Место публикации : J. Mater. Chem. C. - 2019. - Vol. 7, Is. 46. - P.14594-14600. - ISSN 20507534 (ISSN), DOI 10.1039/c9tc05354a
Примечания : Cited References: 38. - This work was supported by the National Natural Science Foundation of China (No. 51722202 and 51972118), the Guangdong Provincial Science & Technology Project (2018A050506004) and the Fundamental Research Funds for the Central Universities (D2190980).
Аннотация: Highly efficient phosphors with thermal stability and color-tunable emission are required for the fabrication of phosphor-converted white light-emitting diodes (pc-WLEDs). Currently developed engineering strategies are generally successful in photoluminescence tuning but, unfortunately, suffer severe deterioration in emission intensity/efficiency and/or thermal stability. Herein, an efficient aliovalent substitution strategy toward reinforced structural rigidity is proposed and demonstrated experimentally. By incorporating Be2+ ion into the garnet-type Lu2SrAl4SiO12:Ce3+ phosphor, the phosphor shows enhanced internal/external quantum efficiency, from 79.2%/26.7% to 84.5%/32.9%, photoluminescence tuning from green (peaking at ∼512 nm) to yellow (peaking at ∼552 nm), and zero thermal quenching, even up to 200 °C. The Be2+ substitution at the Al2/Si2 site enables stable and rigid local surroundings around the Ce3+ activator, which is responsible for the unprecedented performance. In addition, high-quality warm WLED devices with a luminous efficiency of 158.1 lm W-1, correlated color temperature of 3858 K and high color rendering index of 81.7, are obtained by combining Lu2SrAl4SiO12:Ce3+,Be2+ as the yellow emitter, CaAlSiN3:Eu2+ as the red emitter and a blue-emitting InGaN chip. These findings highlight a new strategy for performance optimization of LED phosphors by selecting rigid covalent compounds with further reinforced structural rigidity via aliovalent substitution.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lukyanenko A. V., Tarasov A. S., Shanidze L. V., Yakovlev I. A., Zelenov F. V., Masugin A. N., Ivanov A. B., Baron F. A., Volkov N. V.
Заглавие : Synthesis and transport properties of FET based on Heusler alloy thin films formed by rapid thermal annealing
Коллективы : International School and Conference on optoelectronics, photonics, engineering and nanostructures
Место публикации : J. Phys.: Conf. Ser. - 2019. - Vol. 1410. - Ст.012017. - ISSN 1742-6588, DOI 10.1088/1742-6596/1410/1/012017. - ISSN 1742-6596 (eISSN)
Примечания : Cited References: 10. - This study was supported by the Russian Foundation for Basic Research, project no. 17-02-00302 and supported in part by the Ministry of Education and Science of the Russian Federation and the Siberian Branch of the Russian Academy of Sciences, project II.8.70, and the Presidium of the Russian Academy of Sciences, Fundamental Research Program no. 32 «Nanostructures: Physics, Chemistry, Biology, Basics of Technologies».
Аннотация: In this work we show a preparation technique of Co2FeSi full-Heusler alloy thin films on silicon-on-insulator (SOI) substrates, employing rapid thermal annealing (RTA). The films of the Co2FeSi alloy were formed by a silicidation reaction, caused by RTA, between the ultrathin SOI (001) layer and the Fe/Co layers deposited on it. It is assumed that this technology is compatible with the process of formation of a half-metal source-drain in an advanced CMOS and SOI technology and will be applicable for the manufacture of a source-drain of a field-effect transistor. Schottky barrier field-effect transistors (FET) with a back-gate, based on silicon nanowires with source and drain of a Co2FeSi film, synthesized on an SOI substrate, were manufactured. The transport properties of the device were investigated.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pogoreltsev E. I., Mel'nikova S. V., Molokeev M. S., Flerov I. N., Laptash N. M.
Заглавие : Structural, thermal and optical properties of elpasolite-like (NH4)2KZrF7
Место публикации : J. Solid State Chem. - 2019. - Vol. 277. - P.376-380. - ISSN 00224596 (ISSN), DOI 10.1016/j.jssc.2019.06.013
Примечания : Cited References: 28. - The reported study was funded by RFBR according to the research project No. 18-02-00269 a . The authors are grateful to Krasnoyarsk Center of collective use of SB RAS for providing X-ray analytical equipment.
Аннотация: New fluoride compound (NH4)2KZrF7 with the elpasolite structure (sp. gr. Fm-3m) was synthesized by partial cationic substitution in (NH4)3ZrF7 cryolite. Due to small difference in ionic radii of K+ and NH4+, non-equivalent crystallographic positions 8c and 4b are occupied by both cations. Investigations of thermal, optical and structural properties in a wide range of temperature revealed two phase transitions Fm-3m ↔ P42/ncm ↔ P42/nmc of the first order. The results obtained are discussed in comparison with the data for the previously studied related cryolite (NH4)3ZrF7.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Udod L. V., Aplesnin S. S., Sitnikov M. N., Romanova O. B., Molokeev M. S.
Заглавие : Phase transitions in bismuth pyrostannate upon substitution of tin by iron ions
Место публикации : J. Alloys Compd. - 2019. - Vol. 804. - P.281-287. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2019.07.020
Примечания : Cited References: 44. - The reported study was funded by RFBR according to the research project № 18-52-00009 Bel_a; The reported study was funded by Russian Foundation for Basic Research , Government of Krasnoyarsk Territory , Krasnoyarsk Regional Fund of Science № 18-42-240001 r_a, to the research project: «Inversion of the sign of the components of the magnetoelectric tensor on the temperature in films of bismuth garnet ferrite replaced by neodymium». This work is part of the research program the state order № 3.5743.2017/6.7.
Аннотация: The Bi2(Sn1-хFeх)2O7 (х = 0, 0.1, 0.2) compounds have been synthesized by the solid-state reaction technique. The structure of the synthesized compounds has been investigated in the temperature range of 80–500 K using the thermal expansion and ultrasound damping coefficients and IR spectroscopy. The shift -type structural transitions for the composition with х = 0.2 in the low-temperature region has been established. The effect of iron ions on the phase boundaries of the polymorphic transitions in the Bi2Sn2O7 compound has been observed. Softening of the phonon modes near the phase transitions at different iron concentrations has been found.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kartashev A. V., Bondarev V. S., Flerov I. N., Gorev M. V., Pogorel'tsev E. I., Shabanov A. V., Molokeev M. S., Guillemet-Fritsch S., Raevskii I. P.
Заглавие : Study of the Physical Properties and Electrocaloric Effect in the BaTiO3 Nano- and Microceramics
Место публикации : Phys. Solid State. - 2019. - Vol. 61, Is. 6. - P.1052-1061. - ISSN 1063-7834, DOI 10.1134/S1063783419060088. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 38
Предметные рубрики: HEAT-CAPACITY
DIELECTRIC-PROPERTIES
THERMAL-EXPANSION
THIN-FILMS
Аннотация: The specific heat, thermal expansion, permittivity, and electrocaloric effect in bulk of BaTiO3 (BT) samples in the form of nano- (nBT-500 nm) and micro- (mBT-1200 nm) ceramics fabricated using spark plasma sintering and solid-state plasma techniques have been investigated. The size effect has been reflected, to a great extent, in the suppression of the specific heat and thermal expansion anomalies and in the changes in the temperatures and entropies of phase transitions and permittivity, and a decrease in the maximum intensive electrocaloric effect: ΔTmaxAD = 29 mK (E = 2.0 kV/cm) for nBT and ΔTmaxAD = 70 mK (E = 2.5 kV/cm) for mBT. The conductivity growth at temperatures above 360 K leads to the significant irreversible heating of the samples due to the Joule heat release in the applied electric field, which dominates over the electrocaloric effect.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Bormanis K., Kalvane A.
Заглавие : Thermal expansion and polarization of (1-x)PNN-xPT solid solutions
Коллективы : International Scientific Conference on Functional Materials and Nanotechnologies
Место публикации : Integr. Ferroelectr. - 2019. - Vol. 196, Is. 1. - P.60-63. - ISSN 1058-4587, DOI 10.1080/10584587.2019.1591957. - ISSN 1607-8489(eISSN)
Примечания : Cited References: 6
Предметные рубрики: BEHAVIOR
Аннотация: The paper presents the results of detailed studies of the thermal expansion of (1-x)he paper presents the results of detailed studies of the thermal expansion of (1-x)PbNi1/3Nb2/3O3-xPbTiO3 solid solutions with x = 0-0.8. The anomalous and lattice contributions to deformation and the thermal expansion coefficient are analyzed and the mean square polarization Pd is determined. The results obtained are discussed within the framework of the thermodynamic theory and the Landau 2-4-6 coefficients for solid solutions are estimated.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Kartashev A. V., Pogorel'tsev E. I., Laptash N. M.
Заглавие : Heat capacity, thermal expansion and barocaloric effect in fluoride K2TaF7
Место публикации : J. Mater. Sci. - 2019. - Vol. 54, Is. 23. - P.14287–14295. - ISSN 00222461 (ISSN), DOI 10.1007/s10853-019-03924-8
Примечания : Cited References: 20. - The reported study was funded by RFBR according to the research Project No. 18-02-00269_a.
Аннотация: The heat capacity and thermal expansion of potassium heptafluorotantalate were studied. The room temperature phase P21/c is stable at least to 4 K. The strong first-order phase transition P21/c−Pnma at T0=486.2K is accompanied by giant changes in the entropy, ΔS0=22.3J(molK)−1, and volume strain, δV0/V=−3.6%. A rather high sensitivity of K2TaF7 to pressure was found, dT0/dp=−220KGPa−1. Significant extensive and intensive barocaloric effects are found at low pressure. The possibility of improving the barocaloric properties is discussed.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Lesnikov M. K.
Заглавие : Three isomers in a (hydrogen L-Cysteinato)-thallium(I): Crystal structure, spectroscopic and thermal properties
Место публикации : Polyhedron. - 2019. - Vol. 173. - Ст.114141. - ISSN 02775387 (ISSN) , DOI 10.1016/j.poly.2019.114141
Примечания : Cited References: 37. - The study was carried out within the public task of the Ministry of Education and Science of the Russian Federation to the Siberian Federal University (4.7666.2017/BP) in 2017–2019. X-ray data from single crystals and powder pattern were obtained with use the analytical equipment of Krasnoyarsk Center of collective use of SB RAS.
Аннотация: The isolation of thallium(I) complexes [Tl2(HCys)2]n (1) and [Tl4(HCys)4]n (2) {H2Cys = l-Cysteine} from aqueous solution by means of crystallization is reported herein. Polar crystals of 1 and 2 were crystallized in P21 and P212121 space groups respectively. Elemental analysis, XRD, IR, UV–Vis, TG-DSC and a single crystal X-ray diffraction were applied for characterizing the compounds. Linkage isomers 1 and 2 have 1D and 2D coordination polymeric structures respectively. The lone pair electrons of thallium(I) in 1–2 are stereo-chemically active. In 1, each of two independent Tl+ ions is coordinated by three HCys− ions forming TlS3O irregular polyhedron that is linked to each other by vertexes in an infinite chain. In 2, four independent Tl+ ions are coordinated by HCys− ions through S and O atoms, forming Tl1S3O2, Tl2S4, Tl3S3, Tl4S3 irregular polyhedrons. The crystallographic independent HCys− ions are linked to the metal ion differently, two are μ3-S,S,S-, one is μ4-O,S,S,S-, and one is μ4-O,O',S,S,S-coordinated ligands. The amine group of compounds 1 and 2 is in the form of an ammonium ion (–NH3+). The structures of 1–2 are stabilized by NH⋯O hydrogen bonds, thallophilic Tl⋯Tl and anagostic Tl⋯HC interactions. The spectroscopic and thermal properties of compounds were analyzed.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Sterkhova, I., V
Заглавие : Structure and Thermal Decomposition of Nd(III), Gd(III) and Tb(III) 2-Thiobarbiturates
Коллективы : Ministry of Education and Science of the Russian FederationMinistry of Education and Science, Russian Federation [4.7666.2017/BCh]
Место публикации : Russ. J. Inorg. Chem. - 2019. - Vol. 64, Is. 9. - P.1146-1151. - ISSN 0036-0236, DOI 10.1134/S0036023619090134. - ISSN 1531-8613(eISSN)
Примечания : Cited References: 21. - The work was performed as part of the State Assignment of the Ministry of Education and Science of the Russian Federation to the Siberian Federal University in 2017-2019. (4.7666.2017/BCh). The powder X-ray diffraction studies were performed using the equipment at the Baikal and Krasnoyarsk Centers for Collective Use of the Siberian Branch of the Russian Academy of Sciences.
Предметные рубрики: CRYSTAL-STRUCTURE
TRANSFORMATION
Аннотация: Complexes [Ln2(H2O)6(μ2-Htba−O,O')4(Htba−O)2]n (Ln = Tb (I), Gd (II), Nd (III); and H2tba is thiobarbituric acid) have been synthesized. According to single-crystal X-ray diffraction, monoclinic crystals of I–III are isostructural. They contain three independent Htba– ions (one terminal and two bridging) and two independent Ln3+ ions. Six Htba– ligands (two terminal and four O,O'-bridging) and two water molecules are coordinated to one Ln3+ ion, and four O,O'-bridging Htba– ions and four water molecules are coordinated to the other Ln3+ ion to form square antiprisms. The antiprisms are bound by Htba– bridging ions into layers. Numerous hydrogen bonds and π–π interactions stabilize the structures of the compounds. Thermal decomposition of complexes I and II performed in air results in mixtures of oxides and oxysulfates, whereas complex III forms Nd2O2SO4.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Molokeev M. S., Krylov A. S., Aleksandrovsky A. S., Oreshonkov A. S., Atuchin V. V., Azarapin N. O., Plyusnin P. E., Sal'nikova E. I., Andreev O. V.
Заглавие : High-temperature oxidation of europium (II) sulfide
Место публикации : J. Ind. Eng. Chem. - 2019. - Vol. 79. - P.62-70. - ISSN 1226086X (ISSN) , DOI 10.1016/j.jiec.2019.05.006
Примечания : Cited References: 68. - The authors are grateful for the support from RFBR ( 18-02-00754 , 18-08-00985 , and 18-32-20011 ). This study was also supported by the Russian Science Foundation (project 19-42-02003 , in part of conceptualization).
Аннотация: The process of high-temperature oxidation of EuS in the air was explored in the temperature range of 500–1000 °C. The oxidation reaction enthalpy was determined (ΔH0exp = −1718.5 kJ/mol). The study of oxidation products allowed to establish the mechanism of EuS oxidation with oxygen. At 500–600 °C, EuS is oxidized to a mixture of Eu3+-containing compounds (Eu3S4, Eu2O2S). In the range of 700–1000 °C, only europium oxysulfate Eu2O2SO4 is formed. The structure refinement for Eu2O2SO4 was performed by the Rietveld method. The luminescence intensity of europium oxysulfate Eu2O2SO4 with characteristic 4f-4f transitions from the 5D0 state was investigated as a function of oxidation temperature.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Su, Binbin, Molokeev M. S., Xia, Zhiguo
Заглавие : Mn2+-Based narrow-band green-emitting Cs3MnBr5 phosphor and the performance optimization by Zn2+ alloying
Место публикации : J. Mater. Chem. C. - 2019. - Vol. 7, Is. 36. - P.11220-11226. - ISSN 2050-7526, DOI 10.1039/c9tc04127c. - ISSN 2050-7534(eISSN)
Примечания : Cited References: 24. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51722202, 51972118 and 51572023), Natural Science Foundations of Beijing (2172036) and the Guangdong Provincial Science & Technology Project (no. 2018A050506004).
Предметные рубрики: THERMAL-STABILITY
BACKLIGHT
EMISSION
Аннотация: To discover new narrow-band green-emitting phosphors is a challenge for backlighting light-emitting diodes (LEDs) used in liquid crystal displays (LCDs). The synthesis and optical properties of Cs3MnBr5 are demonstrated herein. The intrinsic Mn2+ luminescence without concentration quenching leads to intense green emission at 520 nm with narrow full width at half maximum of 42 nm and high photoluminescence quantum yield (PLQY) of 49% under the excitation at 460 nm. When a small amount of Zn2+ is introduced into Cs3MnBr5, the luminescence intensity decreases slightly. However, the thermal stability of Cs3MnBr5 is improved from 82% to 87% with the intensity values at 423 K compared to that at 298 K. The white LED device fabricated using Cs3Mn0.96Zn0.04Br5 (green) and K2SiF6:Mn4+ (red) phosphors with a blue LED chip exhibit a high luminous efficiency (107.76 lm W-1) and wide color gamut (101% National Television System Committee standard (NTSC) in Commission Internationale de L'Eclairage (CIE) 1931 color space), demonstrating its potential application in wide color gamut LCD backlights.
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19.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Tkachenko V. A., Tsipotan A. S., Aleksandrovsky A. S., Slabko V. V.
Заглавие : Thermal influence in the process of self-assembly of quantum dots by quasi-resonant laser radiation
Коллективы : Федеральный исследовательский центр "Красноярский научный центр Сибирского отделения Российской академии наук", Институт физики им. Л.В. Киренского Сибирского отделения РАН, Сибирский федеральный университет, "Енисейская фотоника", Всероссийская научная конференция с международным участием
Место публикации : Енисейская фотоника-2020: тезисы докладов. - Красноярск: ИФ СО РАН, 2020. - P.94. - ISBN 978-5-6042995-8-6 (Шифр В34/Е 63-418308835)
Примечания : Cited References: 3
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu, Youquan, Mei, Dajiang, Wang, Naizheng, Molokeev M. S., Jiang, Xingxing, Lin, Zheshuai
Заглавие : Intrinsic isotropic near-zero thermal expansion in Zn4B6O12X (X = O, S, Se)
Место публикации : ACS Appl. Mater. Interfaces. - 2020. - Vol. 12, Is. 34. - P.38435-38440. - ISSN 1944-8244, DOI 10.1021/acsami.0c12351. - ISSN 1944-8252(eISSN)
Примечания : Cited References: 43. - This work was supported by the National Scientific Foundations of China (Grants 51872297, 51702330, 11974360, 51972208, 51890864, and 51802321), Russian Foundation for Basic Research (Grant 17-52-53031), and Fujian Institute of Innovation (FJCXY18010201) in CAS. X.J. acknowledges the support from the Youth Innovation Promotion Association in CAS (Grant 2017035) and Youth Talent Promotion Project from China Association for Science and Technology
Предметные рубрики: CRYSTAL
Аннотация: Zero thermal expansion (ZTE) materials, keeping size constant as temperature varies, are valuable for resisting the deterioration of the performance from environmental temperature fluctuation, but they are rarely discovered due to the counterintuitive temperature-size effect. Herein, we demonstrate that a family of borates with sodalite cage structure, Zn4B6O12X (X = O, S, Se), exhibits intrinsic isotropic near-ZTE behaviors from 5 to 300 K. The very low thermal expansion is mainly owing to the coupling rotation of [BO4] rigid groups constrained by the bonds between Zn and cage-edged O atoms, while the central atoms in the cage have a negligible contribution. Our study has significant implications on the understanding of the ZTE mechanism and exploration of new ZTE materials.
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