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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Potylitsyna, Arina R., Mishakov, Ilya, V, Bauman, Yury, I, Kibis, Lidia S., Shubin, Yury, V, Volochaev M. N., Melgunov, Maxim S., Vedyagin, Aleksey A.
Заглавие : Metal dusting as a key route to produce functionalized carbon nanofibers
Коллективы : Ministry of Science and Higher Education of the Russian Federation [AAAA-A21-121011390054-1, 0239-2021-0010, 121031700315-2]
Место публикации : React. Kinet. Mech. Catal. - 2022. - Vol. 135, Is. 3. - P.1387-1404. - ISSN 1878-5190, DOI 10.1007/s11144-022-02169-y. - ISSN 1878-5204(eISSN)
Примечания : Cited References: 65. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation (Project numbers AAAA-A21-121011390054-1 (ID: 0239-2021-0010) and 121031700315-2)
Предметные рубрики: CHLORINATED HYDROCARBONS
NI-CU
DECOMPOSITION
NANOTUBES
CATALYST
Аннотация: The present paper reports a new method of producing N-doped carbon nanofibers via metal dusting of a ternary NiMoW alloy in the atmosphere containing C2HCl3 and CH3CN vapors at 600 °C. The initial alloy was prepared by a co-precipitation technique. The carbon deposition was monitored gravimetrically. The early stages of the metal dusting process were studied in detail using scanning and transmission electron microscopies. It was established that the rapid disintegration of the microdispersed NiMoW alloy with the formation of nanosized particles catalyzing the growth of carbon filaments occurs within the first 5 min of the reaction. The presence of C2HCl3 vapors in the reaction medium was shown to be the urgent condition to provide efficient metal dusting. The effect of the CH3CN concentration in the trichloroethylene-containing reaction mixture on the carbon deposition is investigated. As observed, the CH3CN content noticeable affects the carbon yield (after 2 h of reaction). The dome-shaped dependence of carbon yield reaches its maximal value of ~ 200 g/g(cat) at a CH3CN concentration of 33 vol%. According to X-ray photoelectron spectroscopy, the obtained carbon filaments are functionalized with Cl (0.1–1.2 wt%), O (3–6 wt%), and N (0.5–1.3 wt%). The prepared carbon filaments possess a segmented secondary structure, which is typical for carbon nanomaterials derived via catalytic decomposition of chlorine-substituted hydrocarbons. Low-temperature nitrogen adsorption measurement revealed that the specific surface area of the N-containing samples varies in a range from 370 to 550 m2/g.
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Вид документа : Статья из журнала
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Автор(ы) : Golovnev N. N., Gerasimova M. A., Molokeev M. S., Plyaskin M. E., Baronin M. E.
Заглавие : Photoluminescence of pefloxacindi-ium manganese(II) and zinc(II) tetrahalides
Место публикации : J. Mol. Struct. - 2022. - Vol. 1248. - Ст.131468. - ISSN 00222860 (ISSN), DOI 10.1016/j.molstruc.2021.131468
Примечания : Cited References: 42. - The research was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, project number 20-43-240007. Authors thank the Centre for Equipment Joint User of School of Petroleum and Natural Gas Engineering of Siberian Federal University, Institute of Chemistry and Chemical Technology SB RAS for their technical support
Аннотация: Mn2+-based hybrid materials have become the hotspot of current research studies owing to their high photoluminescence quantum yield (PLQY), low-cost, environmental friendliness and stability. For the first time, we report the hydrothermal synthesis of two lead-free zero-dimensional luminescent organic-inorganic hybrid compounds, PefH2[MnBr4] (1) and PefH2[MnCl4] (2) (Pef = pefloxacin). They were characterized by elemental analysis, TG-DSC, single-crystal and powder XRD. Compounds 1–2 exhibit a distorted tetrahedral geometry around the manganese(II) metal center, which is isolated from the same centers by bulky pefloxacindi-ium (PefH22+) ions with a Mn···Mn distance of 7.3 Å. Their structures are stabilized by N—H···O, O—H···X (X = Br, Cl), C—H···O and C—H···X hydrogen bands and π–π stacking interaction. Thermal decomposition starts at T › 230°С for 1 and T › 210°С for 2 and proceeds for several stages. Upon UV excitation compounds exhibit a bright green emission with a moderate PLQY of 45% for 1 and 30% for 2. The influence of the halide ion and metal ion on the photoluminescence properties of isostructural compounds PefH2[MX4] (M = Mn, Zn and X = Br, Cl) is discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Павлов А. В., Квеглис, Людмила Иосифовна, Джес А. В., Сапрыкин Д. Н., Насибуллин Р. Т., Великанов, Дмитрий Анатольевич, Немцев, Иван Васильевич, Шалаев П. О.
Заглавие : Магнетизм бериллиевой керамики со структурой перовскита BeTiO3
Место публикации : Фундамент. пробл. совр. материаловед. - 2022. - Т. 19, № 1. - С. 115-124. - ISSN 1811-1416, DOI 10.25712/ASTU.1811-1416.2022.01.013; Basic Probl. Mater. Sci.
Примечания : Библиогр.: 24
Аннотация: Известно, что введение в ВеО-керамику добавки TiO2 после термообработки в восстановительной атмосфере сопровождается значительным увеличением электропроводности и способностью поглощать электромагнитное излучение в широком диапазоне частот. До сих пор механизм этого влияния до конца не установлен. С использованием методов Лоренцевой электронной микроскопии в сканирующем электронном микроскопе, а также вибрационного магнитометра, установлено проявление ферромагнетизма. Такая особенность бериллиевой керамики способствует поглощению электромагнитной энергии в объемных образцах, содержащих наночастицы TiO2. Установлено, что присутствие наночастиц способствует формированию структуры перовскита в зонах спекания BeO + TiO2. В структуре перовскита возможна поляризация молекул за счет формирования поляронов, что приводят к деформации решетки и смещению атомов. В результате такого смещения происходит изменение ближнего порядка в структуре перовскита и к образованию икосаэдрической фазы из исходной фазы со структурой кубоктаэдра. Малый размер атома бериллия позволяет организоваться тетраэдрической плотной упаковке в форме икосаэдра из атомов кислорода вокруг центрального атома бериллия. В результате повышается атомная плотность и плотность электронных состояний на уровне Ферми. Предлагаются модели для объяснения причины появления ферромагнетизма и электропроводности, которые обнаружены в бериллиевой керамике. С помощью метода спин-поляризованных электронов проведены расчеты электронной структуры нанокластеров с различным ближним порядком.It is known that the introduction of TiO2 additives into BeO ceramics after heat treatment in a reducing atmosphere is accompanied by a significant increase in electrical conductivity and the ability to absorb electromagnetic radiation in a wide frequency range. Until now, the mechanism of this influence has not been fully established. Using the methods of Lorentzian electron microscopy in a scanning electron microscope, as well as a vibration magnetometer, the manifestation of ferromagnetism was established. This feature of beryllium ceramics promotes the absorption of electromagnetic energy in bulk samples containing TiO2 nanoparticles. It was found that the presence of nanoparticles promotes the formation of the perovskite structure in the BeO + TiO2 sintering zones. In the structure of perovskite, polarization of molecules is possible due to the formation of polarons, which leads to deformation of the lattice and displacement of atoms. As a result of this displacement, a change in the short-range order in the perovskite structure occurs and to the formation of an icosahedral phase from the initial phase with a cuboctahedral structure. The small size of the beryllium atom makes it possible to organize a tetrahedral close packing in the form of an icosahedron of oxygen atoms around the central beryllium atom. As a result, the atomic density and the density of electronic states at the Fermi level increase. Models are proposed to explain the reasons for the appearance of ferromagnetism and electrical conductivity found in beryllium ceramics. Using the spin-polarized electron method, the electronic structure of nanoclusters with different short-range orders has been calculated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivantsov R. D., Lin C. -R., Chen Y. -Z., Ivanova O. S., Altunin R. R., Knyazev Yu. V., Molokeev M. S., Zharkov S. M., Shestakov N. P., Sukhachev A. L., Edelman I. S.
Заглавие : Effect of surfactants on the structure, phase composition, and magnetic properties of FexSy nanoparticles synthesized by thermal decomposition
Место публикации : Nanobiotechnol. Rep. - 2022. - Vol. 17, Is. 3. - P.336-344. - ISSN 26351676 (ISSN), DOI 10.1134/S2635167622030089
Примечания : Cited References: 27. - This study was supported by the Russian Foundation for Basic Research with Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, the research project no. 19-42-240005: “Features of the Electronic Structure, Magnetic Properties, and Optical Excitations in Nanocrystals of Multifunctional Magnetic Chalcogenides Fe3S4 and FeSe” and the Russian Foundation for Basic Research and the Ministry of Science and Technology of Taiwan, joint projects nos. 19-52-52002 and 109-2112-M-153-003 and 108-2923-M-153-001-MY3The electron-microscopy study was carried out at the Laboratory of Electron Microscopy of the Center for Collective Use of the Siberian Federal University within the state assignment of the Ministry of Science and Higher Education of the Russian Federation (research code FSRZ-2020-0011). The magnetic measurements were carried out on a vibrating sample magnetometer at the Krasnoyarsk Regional Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences
Аннотация: The effect of surfactants on the structure, morphology, and magnetic properties of FexSy iron-sulfide nanoparticles synthesized by thermal decomposition is studied. Oleylamine, hexadecylamine, and octadecylamine are used as surfactants. It is established by X-ray and electron-diffraction analysis combined with Mossbauer spectroscopy that, in samples 1 and 2 prepared using oleylamine and hexadecylamine, respectively, the Fe3S4 greigite phase dominates, with an inverse spinel structure isostructural to the iron oxide Fe3O4 magnetite with minor Fe9S11 impurities. Deviations in the distribution of iron cations over the tetrahedral and octahedral sites relative to the bulk greigite crystals are observed. The nanoparticles synthesized using octadecylamine (sample 3) are found to be multiphase with a greigite fraction of ~20%. In all three cases, as showed the results of transmission electron microscopy and Fourier transform infrared spectroscopy together with thermogravimetry analysis, the magnetic nanoparticles have an organic shell chemically bonded to their magnetic core, which prevents the agglomeration of the particles. This shell is much more massive in samples 2 and 3. The magnetization values for samples 1 and 2 are similar to those of greigite nanoparticles reported in publications, while the magnetization of sample 3 is several times lower, in accordance with the greigite fraction in it. The combination of fairly high magnetization with a massive organic shell allows one to consider hexadecylamine to be a promising surfactant for the synthesis of iron-sulfide nanoparticles protected from external impact and agglomeration.
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Вид документа : Статья из журнала
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Автор(ы) : Kudashev S. V., Kondrasenko A. A., Maiulev A. N., Babkin V. A., Belousova V. S., Andreev D. S., Zheltobryukhov V. F., Kuznetsova N. V.
Заглавие : Modification of polycaproamide composites based on 1H,1H,13H-rihydroperfluorotridecan-1-ol and montmorillonite
Место публикации : Fibre Chem. - 2022. - Vol. 53, Is. 5. - P.291-295. - ISSN 00150541 (ISSN), DOI 10.1007/s10692-022-10287-5
Примечания : Cited References: 24
Аннотация: Modification of polycaproamide by 1H,1H,13H-trihydroperfluorotridecan-1-ol immobilized on montmorillonite produced an F-containing polymer composite. The structure of the resulting composite was investigated using x-ray structure analysis and solid-state 19F NMR spectroscopy. The polymorphous composition of this heterochain polymer was shown to reorganize to enhance its thermal stability and diminish its flammability. Possible mechanisms for the stabilizing effect of the used modifier that were related to the involvement of organo-clay paramagnetic centers in the binding of macroradicals formed during thermal decomposition of macromolecular chains were discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivantsov R. D., Lin C. -R., Ivanova O. S., Altunin R. R., Knyazev Yu. V., Molokeev M. S., Zharkov S. M., Chen Y. -Z., Lin E. -S., Chen B. -Y., Shestakov N. P., Edelman I. S.
Заглавие : Mossbauer and MCD spectroscopy of the Fe3S4 nanoparticles synthesized by the thermal decomposition method with two different surfactants
Место публикации : Curr. Appl. Phys. - 2021. - Vol. 25. - P.55-61. - ISSN 15671739 (ISSN), DOI 10.1016/j.cap.2021.02.013
Примечания : Cited References: 30. - The reported study was funded by Joint Research Project of Russian Foundation for Basic Research № 19-52-52002 and Ministry of Science and Technology, Taiwan MOST № 108-2923-M-153-001-MY3 and № 106-2112-M-153-001-MY3 , and by Russian Foundation for Basic Research with Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science , the research project number 19-42-240005 : “Features of the electronic structure, magnetic properties and optical excitations in nanocrystals of the multifunctional magnetic chalcogenides Fe3S4 and FeSe”. The electron microscopy and electron diffraction investigations were conducted in the SFU Joint Scientific Center supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation. The thermal-gravity measurements were carried out with the differential Scanning Calorimeter DSC 204 F-1 Phoenix (NETZSCH) in the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS»
Аннотация: Greigite (Fe3S4) nanoparticles (NPs) were fabricated by the thermal decomposition method using two different surfactants: oleylamine (OLA) and 1-hexadecylamine (HDA). In both cases, the synthesized NPs were characterized as the Fe3S4 nanocrystals with minor inclusions of Fe9S11 phase. FT-IR spectroscopy and thermo-gravimetric analysis allow concluding about OLA or HDA shells covering magnetic core of NPs. Mossbauer spectra has revealed deviations of iron ions distribution among crystal positions from that presented in literature for pure greigite. In accordance with these deviations, the pronounce changes are observed in the magnetic circular dichroism (MCD) spectra which manifest themselves as the spectrum shift to higher energies of electromagnetic waves and redistribution of the MCD maximum intensities. These effects are associated with a change in the density of electronic states in the samples due to the redistribution of iron ions between octahedral and tetrahedral positions in nanocrystals under the influence of surfactants.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivantsov R. D., Chun-Rong Lin, Knyazev Yu. V., Ying Zhen Chen, Zharkov S. M., Lin E. S., Chen B.Y., Yaw-Teng Tseng, Edelman I. S.
Заглавие : Morphology and magnetic properties of iron sulphides nanoparticles synthesized by the thermal decomposition method with different surfactants
Коллективы : "Новое в магнетизме и магнитных материалах", международная конференция, Научный совет по физике конденсированных сред РАН, МИРЭА - Российский технологический университет, Московский государственный университет им. М.В. Ломоносова, Магнитное общество России
Место публикации : Новое в магнетизме и магнитных материалах: сборник трудов XXIV международной конференции/ прогр. ком.: Р. С. Исхаков, С. Г. Овчинников [и др.]. - 2021. - Секция 11: Магнитные наноструктуры. - Ст.11-25-28
Примечания : Библиогр.: 4
Аннотация: Morphology, magnetic, and structural properties were investigated of the iron sulphides (FexSy) nanoparticles fabricated by the thermal decomposition method using oleylamine, 1-hexadecylamine and octadecylamine surfactants. The presence of surfactant layer is confirmed by FT-IR spectroscopy and thermo-gravimetric analysis. The structural analysis and Mцssbauer spectroscopy of synthesized nanoparticles showed in main Fe3S4 phase with inclusions of Fe9S11 in cases of OLA and HDA surfactants and significant admixture of FeS2 and even Fe2O3 in case of ODA surfactant. Deviations of iron ions distribution among crystal positions from that in bulk pure greigite and the pronounce changes in the magnetic circular dichroism (MCD) spectra are explained with the influence of surfactants on the particles formation process as well with the role of the boundary between magnetic core and organic shell.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Sedykh A. E., Basova S. A., Atuchin V. V., Molokeev M. S., Aleksandrovsky A. S., Krylov A. S., Oreshonkov A. S., Khritokhin N. A., Sal'nikova E. I., Andreev O. V., Muller-Buschbaum K.
Заглавие : Exploration of the structural, spectroscopic and thermal properties of double sulfate monohydrate NaSm(SO4)2·H2O and its thermal decomposition product NaSm(SO4)2
Место публикации : Adv. Powder Technol. - 2021. - Vol. 32, Is. 11. - P.3943-3953. - ISSN 09218831 (ISSN), DOI 10.1016/j.apt.2021.08.009
Примечания : Cited References: 81. - This work was partly supported by the Russian Science Foundation (21-19-00046) and Russian Foundation for Basic Research (Grant 19-33-90258\19). The use of the equipment of Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS” is acknowledged
Аннотация: Samarium-sodium double sulfate crystalline hydrate NaSm(SO4)2·H2O was obtained by the crystallization from an aqueous solution containing equimolar amounts of ions. The anhydrous salt of NaSm(SO4)2 was formed by a thermally induced release of the equivalent of water from NaSm(SO4)2·H2O. The kinetic parameters of thermal decomposition were determined (Ea = 102 kJ/mol, A = 9·106). The crystal structures of both compounds were refined from the X-ray powder diffraction data. Sulfate hydrate NaSm(SO4)2·H2O crystallizes in the trigonal symmetry, space group P3121 (a = 6.91820(3) and c = 12.8100(1) Å, V = 530.963(7) Å3). The anhydrous salt crystallizes in the triclinic symmetry, space group P-1 (a = 6.8816(2), b = 6.2968(2) and c = 7.0607(2) Å, α = 96.035(1), β = 99.191(1) and γ = 90.986(1)°, V = 300.17(1) Å3). The vibrational properties of compounds are mainly determined by the sulfate group deformations. The luminescence spectra of both sulfates are similar and are governed by the transitions of samarium ions 4G5/2 → 6HJ (J = 5/2, 7/2, 9/2 and 11/2). The anhydrous sulfate is stable up to 1100 K and undergoes an almost isotropic expansion when heated. After 1100 K, the compound decomposes into Sm2(SO4)3 and Na2SO4.
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Вид документа : Статья из журнала
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Автор(ы) : Golovnev N. N., Molokeev M. S., Lesnikov M. K., Samoilo A. S.
Заглавие : Hydrates of lanthanide(III) 2-thiobarbiturates: synthesis, structure, and thermal decomposition
Место публикации : Russ. J. Inorg. Chem. - 2020. - Vol. 65, Is. 7. - P.999-1005. - ISSN 00360236 (ISSN), DOI 10.1134/S0036023620070098
Примечания : Cited References: 22. - This study was financially supported by the Russian Foundation for Basic Research within scientific project no. 19-52-80003
Аннотация: The hydrates Ln(Htba)3 ∙ 3H2O (Ln = Yb (I), Er (II), Ho (III); Н2tba = 2-thiobarbituric acid), Ln(Htba)3 ∙ 2H2O and Ln(Htba)3 ∙ 8H2O were crystallized from aqueous solutions. According to single-crystal X-ray diffraction analysis data, the structure of monoclinic crystals of isostructural complexes I–III was [Ln2(H2O)6(μ2-Htba-О,O')4(Htba-О)2]n. The formation of isostructural Ln(Htba) ∙ 2H2O (Ln = La, Ce, Eu, Yb, Lu), Ln(Htba)3 ∙ 8H2O (Ln = Eu, Tb, Ho, Yb) and Y(Htba)3 ∙ nH2O (n = 2, 8) was confirmed by the comparison of X-ray diffraction patterns, and their composition was determined by elemental and thermal analyses. The stability of crystal hydrates under heating in an air atmosphere and in contact with their saturated solutions was studied.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sasmaz M., Dreist F., Iglesias I., Cakir A., Farle M., Acet M.
Заглавие : Decomposition in Ni-Co-Mn-In functional Hensler alloys and its effect on shell-ferromagnetic and magnetocaloric effects
Коллективы : Deutsche ForschungsgemeinschaftGerman Research Foundation (DFG) [405553726-CRC/TRR 270]; Turkish Scientific and Technological Research CouncilTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [1059B191701241]; Deutsche Akademisches Austausch Dienst; Government of the Russian Federation [075-15-2019-1886]
Место публикации : Phys. Rev. B. - 2020. - Vol. 102, Is. 6. - Ст.064401. - ISSN 2469-9950, DOI 10.1103/PhysRevB.102.064401. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 38. - This work was supported by Deutsche Forschungsgemeinschaft (Project No. 405553726-CRC/TRR 270). The authors acknowledge support from the Turkish Scientific and Technological Research Council (Project No. 1059B191701241), the Deutsche Akademisches Austausch Dienst, and the Government of the Russian Federation (Grant No. 075-15-2019-1886).
Предметные рубрики: FIELD-INDUCED STRAIN
MAGNETIC-FIELD
MARTENSITIC-TRANSFORMATION
Аннотация: Ni-Co-Mn-In Heusler-based compounds are interesting for their magnetocaloric properties and have been widely investigated for this purpose. For Co compositions more than 5 at% in (Ni100-xCox)50Mn25+yIn25-y the material is no longer single phase, and for y 25, shell-ferromagnetic precipitation occurs. Our study is twofold: First we study here the shell-ferromagnetic properties of these systems and show that their ferromagnetic exchange can be strengthened by introducing Co into the precipitate. Second, we further show that both the multiphase character and shell-ferromagnetic precipitation have strong implications on the magnetocaloric properties.
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11.

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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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Lesnikov M. K.
Заглавие : Structure of potassium and cesium barbiturates
Коллективы : Ministry of Education and Science [4.7666.2017/BCh]
Место публикации : Russ. J. Inorg. Chem. - 2018. - Vol. 63, Is. 10. - P.1315-1321. - ISSN 0036-0236, DOI 10.1134/S0036023618100078. - ISSN 1531-8613(eISSN)
Примечания : Cited References: 25. - This work was performed within the state task from the Ministry of Education and Science to the Siberian Federal University in 2017-2019 (4.7666.2017/BCh).
Предметные рубрики: CRYSTAL-STRUCTURE
THERMAL-PROPERTIES
1,3-DIETHYL-2-THIOBARBITURATE
Ключевые слова (''Своб.индексиров.''): potassium and cesium barbiturates--synthesis--structure--thermal decomposition
Аннотация: The structures of catena-[K(μ6-Hba−O,O,O,O′,O′,O″)] (I) and catena-[Cs(μ6-Hba–O,O,O′,O′,O″,O″)] (II), where Н2ba is barbituric acid C4H4N2O3, were characterized by powder X-ray diffraction. Crystallographic data: a = 14.1603 (4) Å, b = 3.68977 (9) Å, c = 10.9508 (3) Å, β = 82.226 (1)°, V = 566.90 (3) Å3, space group P21/n, Z = 4 for I; a = 14.652 (1) Å, b = 11.7275 (7) Å, c = 3.8098 (3) Å, β = 79.140 (6)°, V = 642.90 (8) Å3, space group C2/m, Z = 4 for II. The structural topologies of alkali metal complexes with barbituric acid and some its derivatives were compared. The thermal stability of complexes I and II in an air atmosphere was studied.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Sterkhova I. V., Lesnikov M. K.
Заглавие : Two novel mixed-ligand Ni(II) and Co(II) complexes with 1,10-phenanthroline: Synthesis, structural characterization, and thermal stability
Место публикации : Chem. Phys. Lett. - 2018. - Vol. 708. - P.11-16. - ISSN 00092614 (ISSN), DOI 10.1016/j.cplett.2018.07.058
Примечания : Cited References: 29. - 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 were obtained with use the analytical equipment of Baikal Center of collective use of SB RAS and with use the analytical equipment of Krasnoyarsk Center of collective use of SB RAS.
Ключевые слова (''Своб.индексиров.''): barbituric acid--1,10-phenanthroline complexes--x-ray diffraction--thermal decomposition--infrared spectroscopy
Аннотация: Two nickel(II) and cobalt(II) complexes with phenanthroline, [Ni(Phen)(H2O)3Br]Br (1) and [Co(Phen)2(H2O)2](Hba)2·2H2O (2), Phen = 1,10-phenanthroline and Hba− = barbiturate anion, were synthesized and characterized by powder XRD, TGA and FT-IR. Their structures were determined by single crystal X-ray diffraction techniques. The Ni2+ ion is coordinated by two N atoms of Phen molecule, Br− ion and three H2O molecules forming an octahedron. Uncoordinated and coordinated Br− ions are connected with water molecules by OH⋯Br intermolecular hydrogen bonds with the formation of a 2D plane network which is extended into a 3D network by π−π stacking interactions. The [Co(Phen)2(H2O)2]2+ cation contains a six-coordinated cobalt atom chelated by two Phen ligands and two aqua ligands in the cis arrangement. NH⋯O, OH⋯O and CH⋯O intermolecular hydrogen bonds form a 3D net. NH⋯O hydrogen bonds form the infinite chains of Hba–. In addition, coordinated Phen molecules and lattice water molecules are linked via CH⋯OW hydrogen bonds to form infinite zigzag chains. These different chains are connected by OWH⋯O hydrogen bonds. π−π interaction plays an important role in the stabilization of structures 1–2. FT-IR, TGA, the diffuse reflectance, and UV–Vis spectra were also used to characterize these compounds.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Zharkov S. M., Pankrats A. I., Vorotynov A. M., Tugarinov V. I., Ivantsov R. D., Petrov D. A., Velikanov D. A., Lin C. -R., Chen C. -C., Tseng Y. -T., Hsu H. -S.
Заглавие : Electron spin resonance in Cu1−xFexCr2Se4 nanoparticles synthesized with the thermal decomposition method
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2017. - Vol. 436. - P.21-30. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2017.04.006
Примечания : Cited References: 34. - The paper was partially supported by the President of Russia (Grant #NSh-7559.2016.2). We also thank the Ministry of Science and Technology of Taiwan, Taiwan, and the Siberian Branch of RAS, Russian Federation (MOST 102-2112-M-153-002-MY3) for the financial support.
Ключевые слова (''Своб.индексиров.''): anisotropy--association reactions--chromium compounds--decomposition--electrospinning--inorganic compounds--magnetic moments--magnetocrystalline anisotropy--nanoparticles--plates (structural components)--resonance--spin dynamics--synthesis (chemical)--temperature distribution--thermolysis--inter-particle interaction--nanoparticle (nps)--resonance spectrum--single-crystalline--temperature behavior--temperature decrease--temperature dependence--thermal decomposition methods--electron spin resonance spectroscopy
Аннотация: IIn this paper, we present a study of the electron spin resonance (ESR) of nanoparticles (NPs) of Cu1−xFexCr2Se4 chalcogenides with x = 0, 0.2, and 0.4. NPs were synthesized via the thermal decomposition of metal chloride salts and selenium powder in a high-temperature organic solvent. According to the XRD and HRTEM data, the NPs were single crystalline nearly hexagonal plates with the structure close to CuCr2Se4 (Fd-3m, a = 10.337 Å). For x = 0 and 0.2, the NPs tend to form long stacks consisting of the plates “face to face” attached to each other due to the magnetostatic interparticle interaction. Only separate NPs were observed in the case of x = 0.4. Peculiarities were revealed in the ESR temperature behavior for the NPs with x = 0 and 0.2 consistent with the features in the temperature dependences of the NPs magnetization. The non-monotonous dependence of the resonance field Hres on the temperature with a kink near 130 K and the energy gap in the resonance spectrum depending on the type of nanoparticle compacting are the distinct peculiarities. One of the main factors is discussed in order to explain the peculiarities: the coexistence of two types of anisotropy in the Cu1−xFexCr2Se4 NPs, in-plain shape anisotropy and magnetocrystalline anisotropy with four easy axes, which increases strongly with the temperature decrease.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Sterkhova I. V., Vereshchagin S. N., Golovneva I. I.
Заглавие : Crystal structure and properties of polymeric hexaaqua-hexakis-(2-thiobarbiturato)-disamarium(III)
Место публикации : J. Struct. Chem. - 2017. - Vol. 58, Is. 3. - P.539-543. - ISSN 00224766 (ISSN), DOI 10.1134/S0022476617030155
Примечания : Cited References: 17
Ключевые слова (''Своб.индексиров.''): structure--synthesis--complex--2-thiobarbituric acid--samarium(iii)--thermal decomposition--ir spectrum
Аннотация: The structure (CIF file CCDC No. 1401886) of the hexaaqua-hexakis(2-thiobarbiturato)-disamarium [Sm2(H2O)6(HTBA)6]n polymeric complex (I), where H2ТВА is 2-thiobarbituric acid, is determined; its thermal decomposition and IR spectrum are studied. The crystals of I are monoclinic: a = 14.072(1) Å, b = 10.0842(6) Å, c = 15.323(1) Å, β = 110.408(2)°, V = 2037.9(2) Å3, space group P2/n, Z = 2. All three independent thiobarbiturate anions HTBA– coordinate to Sm3+ through oxygen atoms. To one of independent Sm3+ ions six (two terminal and four bridging) HTBA– ions and two water molecules are coordinated; the second is bonded with four bridging HTBA– and four water molecules, forming square antiprisms. The bridging HТВА–anions arrange antiprisms in layers. The structure is stabilized by hydrogen bonds and a π–π interaction between the HТВА– ions. The topology of the polymer network of I is analyzed.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Xia Z., Liu G., Wen J., Mei Z., Balasubramanian M., Molokeev M. S., Peng L., Gu L., Miller D. J., Liu Q., Poeppelmeier K. R.
Заглавие : Tuning of photoluminescence by cation nanosegregation in the (CaMg)x(NaSc)1-xSi2O6 solid solution
Место публикации : J. Am. Chem. Soc.: American Chemical Society, 2016. - Vol. 138, Is. 4. - P.1158-1161. - ISSN 00027863 (ISSN), DOI 10.1021/jacs.5b12788
Примечания : Cited References: 23. - Work performed by Z.X. and Q.L. was supported by the National Natural Science Foundation of China (51272242 and 51572023), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), and the Beijing Nova Program (Z131103000413047). Work performed by G.L., J.W., Z.M., M.B., and D.J.M. at Argonne National Laboratory was supported by the Office of Basic Energy Sciences of the U.S. Department of Energy (DOE) through Grant DE-AC02-06CH11357 for research on heavy elements chemistry and materials sciences. TEM was accomplished in part at the Center for Nanoscale Materials, a DOE Office of Science User Facility under Contract DE-AC02-06CH11357. Sector 20 operations at APS are supported by DOE and the Canadian Light Source, with additional support from the University of Washington. G.L. acknowledges travel support from the CAS/SAFEA International Partnership Program for Creative Research Teams. K.R.P. gratefully acknowledges support from the National Science Foundation (DMR-1307698).
Предметные рубрики: SPINODAL DECOMPOSITION
ENERGY-TRANSFER
EXSOLUTION
CLINOPYROXEN
NANOCRYSTALS
SEGREGATION
MECHANISMS
PYROXENESS
JERVISITE
PHOSPHORS
Аннотация: Controlled photoluminescence tuning is important for the optimization and modification of phosphor materials. Herein we report an isostructural solid solution of (CaMg)x(NaSc)1-xSi2O6 (0 < x < 1) in which cation nanosegregation leads to the presence of two dilute Eu2+ centers. The distinct nanodomains of isostructural (CaMg)Si2O6 and (NaSc)Si2O6 contain a proportional number of Eu2+ ions with unique, independent spectroscopic signatures. Density functional theory calculations provided a theoretical understanding of the nanosegregation and indicated that the homogeneous solid solution is energetically unstable. It is shown that nanosegregation allows predictive control of color rendering and therefore provides a new method of phosphor development. © 2016 American Chemical Society.
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17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Likhacheva A. Y., Prasad P. S. R., Vtyurin A. N.
Заглавие : Raman study of thaumasite and its decomposition at simultaneously high P-T parameters
Коллективы : "GeoRaman", International conference, Российская академия наук, Сибирское отделение РАН, Институт геологии и минералогии им. В.С. Соболева Сибирского отделения РАН
Место публикации : XII Int. conf. "GeoRaman-2016": abstract volume/ compiled and edited by T.A. Alifirova, S.V. Rashchenko, A.V. Korsakov. - Novosibirsk: Офсет, 2016. - P.22. - ISBN 978-5-85957-124-6
Примечания : References: 1. - This work was supported by the Russian Foundation for Basic Research (projects No. 14-05-00616 and 15-55-45070-IND) and the Russian Science Foundation (project No. 15-17-30012).
Аннотация: Thaumasite Ca3Si(OH)6(SO4)(CO3)12H2O is extraordinary mineral that possibly plays particular role in silicate-sulfate-carbonate balance of the Earth‟s interiors. High pressure behavior of thaumasite was studied only in He medium at room T [1]. We present Raman spectroscopy study of thaumasite compressed in water at simultaneously high P-T conditions up to ~300 °C and ~2 GPa, in order to elucidate possible non-quenchable states (polymorphism, overhydration, reversible amorphization and dehydration), as well as its decomposition. Raman bands of thaumasite diminish in intensity and widen in the range of 200-300 °C (Fig. 1). Thaumasite crystals are partly dissolved in water. After the release of high P-T, strong band at 991 cm–1 shifts to 985 cm –1, corresponding to partly disordered thaumasite. The stability range of thaumasite is extended up to ~250 °C at ~2 GPa. At 300 °C and ~2 GPa, thaumasite is decomposed to aragonite, gypsum and partly amorphous silicate within 30 min.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova T. G., Vinogradova O. N., Zhila N. O., Peterson I. V., Kiselev E. G., Vasiliev A. D., Sukovatiy A. G., Shishatskaya E. I.
Заглавие : Properties of a novel quaterpolymer P(3HB/4HB/3HV/3HHx)
Место публикации : Polymer: Elsevier, 2016. - Vol. 101. - P.67-74. - ISSN 00323861 (ISSN), DOI 10.1016/j.polymer.2016.08.048
Ключевые слова (''Своб.индексиров.''): physicochemical and mechanical properties--polyhydroxyalkanoates--quaterpolymers--biocompatibility--cell culture--chain length--chains--decomposition--3-hydroxyhexanoate--degrees of crystallinity--elongation at break--physico-chemical and mechanical properties--polyhydroxyalkanoates--quaterpolymers--short chain lengths--thermal decomposition temperature--film preparation
Аннотация: Cupriavidus eutrophus В10646 was used to synthesize a series of polyhydroxyalkanoate (PHA) quaterpolymers composed of the short-chain-length 3-hydroxybutyrate (3HB), 4-hydroxybutyrate (4HB), and 3-hydroxyvalerate (3HV) and the medium-chain-length 3-hydroxyhexanoate (3HHx). The molar fraction of 3HB in the quaterpolymers varied between 63.5 and 93.1 mol.%, 3HV – between 1.1 and 24.6 mol.%, 4HB – between 2.4 and 15.6 mol.%, and 3HHx – between 0.4 and 4.8 mol.%. The properties of PHA quaterpolymers were significantly different from those of the P(3HB) homopolymer: they had much lower degrees of crystallinity (up to 30–45%), and lower melting points and thermal decomposition temperatures, with the interval between these temperatures remaining practically unchanged. Films prepared from PHA quaterpolymers were rougher and more porous than P(3HB) films; they showed higher values of elongation at break (up to 6–113%), i.e. were more elastic. Films prepared from PHA quaterpolymers were biocompatible and had no toxic effect on mouse fibroblast NIH 3T3 cells. © 2016 Elsevier Ltd
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Vereshchagin S. N., Atuchin V. V.
Заглавие : Synthesis and thermal transformation of a neodymium(III) complex [Nd(HTBA)2(C2H3O2)(H2O)2]·2H2O to non-centrosymmetric oxosulfate Nd2O2SO4
Коллективы : Ministry of Education and Science of the Russian Federation
Место публикации : J. Coord. Chem.: Taylor & Francis, 2015. - Vol. 68, Is. 11. - P.1865-1877. - ISSN 0095, DOI 10.1080/00958972.2015.1031119. - ISSN 10290389(eISSN)
Примечания : Cited References:59. - The study was carried out within the public task of the Ministry of Education and Science of the Russian Federation for research engineering at the Siberian Federal University in 2014. V.V.A. is grateful to the Ministry of Education and Science of the Russian Federation for the financial support of this investigation.Cover image: Artwork representing main idea of this article
Предметные рубрики: THIOBARBITURIC ACID COMPLEXES
TRANSITION-METAL-COMPLEXES
Ключевые слова (''Своб.индексиров.''): neodymium--2-thiobarbituric acid--crystal structure--thermal--decomposition--ir spectroscopy
Аннотация: Neodymium complex [Nd(HTBA)2(C2H3O2)(H2O)2]n·2nH2O (1) (H2TBA = 2-thiobarbituric acid, C4H4N2O2S) has been synthesized in an aqueous solution at 80–90 °C. The crystal structure of 1 has been determined by the Rietveld method in space group P21/n, a = 8.5939(2), b = 22.9953(5), c = 10.1832(2) Å, β = 112.838(1)°, Z = 4, and R = 0.0181. In 1, the Nd(III) is coordinated by four μ2-HTBA– ions through O, three oxygens from two μ2-η2 : η1-bridging CH3COO– anions, and two terminal waters with a tri-capped trigonal prism structure. The prisms form an edge-contact pair through two O from two acetates. The pairs are connected by HTBA– and form a 3-D framework. The principle product of thermal decomposition of 1 at 750 °C is Nd2O2SO4 (2). The crystal structure of 2 has been obtained in space group I222, a = 4.1199(4), b = 4.2233(4), c = 13.3490(12) Å, Z = 2, and R = 0.0246. The structure is related to an orthorhombic structure type of M2O2SO4 (M = Ln) compounds. In 2, the Nd3+ is coordinated by six oxygens in a trigonal prism. Each NdO6 prism links with two SO4 tetrahedra by nodes, with four other NdO6 prisms by edges, and with four other NdO6 prisms by nodes, and the units form the 3-D frame. In the frame, the layers of SO4 tetrahedra are alternated by two NdO6 prism layers.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Li, Oksana A., Lin, Chun-Rong, Chen, Hung-Yi, Hsu, Hua-Shu, Wu, Kai-Wun, Tseng, Yaw-Teng, Bayukov O. A., Edelman I. S., Ovchinnikov S. G., Shih, Kun-Yauh
Заглавие : Structural and magnetic properties of Fe1−xCoxSe1.09 nanoparticles obtained by thermal decomposition
Место публикации : Mater. Res. Express: IOP Publishing, 2015. - Vol. 2, No. 12. - Ст.126501. - ISSN 2053-1591, DOI 10.1088/2053-1591/2/12/126501
Примечания : Cited References: 30. - This work is supported by the Ministry of Science and Technology of Taiwan (MOST103-2811-M-153 -001 and MOST102-2112-M-153 -002 -MY3).
Предметные рубрики: X-RAY-DIFFRACTION
MOSSBAUER-SPECTROSCOPY
CRYSTAL-STRUCTURES
IRON SELENIDES
SUPERCONDUCTIVITY
FeSe
MARCASITE
PYRITE
Ключевые слова (''Своб.индексиров.''): nanoparticles--chalcogenide--iron-cobalt selenide--ferrimagnetism--paramagnetism--mossbauer spectroscopy
Аннотация: A series of Fe1−xCoxSe1.09 (x = 0 to ) nanoparticles were synthesized by thermal decomposition method. Particles in composition range Fe0.5Co0.5Se1.09 to CoSe1.09 crystallized in monoclinic structure of Co6.8Se8 , while FeSe1.09 crystallized in hexagonal structure of FeSe achavalite. Magnetization dependences on temperature and external magnetic field reveal complicated magnetic behavior and correspond to the sum of paramagnetic and superparamagnetic response. Mössbauer spectra contain several paramagnetic doublets with parameters corresponding to nonequivalent positions of divalent and trivalent iron cations with low spin. The nonequivalent positions appeared due to inhomogeneous distribution of Co ions or metal vacancies in iron surrounding.
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