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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Vereschagin S. N., Atuchin V. V.
Заглавие : 2-Thiobarbiturate complexes of Ca(II): synthesis, crystal structure and thermal properties
Коллективы : International Conference on the Advancement of Materials and Nanotechnology (3; 2013 ; Nov. ; 19-22; Penang, Malaysia)
Место публикации : 3 Int. Conf. on the Advancement of Mater. and Nanotechn. (ICAMN 2013): Programme and abstracts book. - 2013. - P.157
Ключевые слова (''Своб.индексиров.''): calcium--2-thiobarbituric acid--crystal structure--thermal decomposition--ir spectroscopy
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Vereshchagin S. N., Atuchin V. V.
Заглавие : Calcium and strontium thiobarbiturates with discrete and polymeric structures
Место публикации : J. Coordinat. Chem.: Taylor & Francis, 2013. - Vol. 66. No. 23. - P.4119–4130. - ISSN 4119-4130, DOI 10.1080/00958972.2013.860450
Ключевые слова (''Своб.индексиров.''): calcium--2-thiobarbituric acid ir--crystal structure--thermal decomposition--strontium--ir spectroscopy
Аннотация: Three new alkaline earth metal complexes, [Ca2(H2O)8(μ2-HTBA-O,O′)2(HTBA-O)2] (1), [Ca(H2O)5(HTBA-O)2]·2H2O (2), and [Sr(H2O)4(μ2-HTBA-O,S)2]n (3) (H2TBA = 2-thiobarbituric acid, C4H4N2O2S), were synthesized and characterized by FT-IR spectroscopy, TG-DSC, and single-crystal and powder X-ray diffraction analysis. The single-crystal X-ray diffraction data revealed that 1 and 2 are discrete structures, whereas 3 is a polymer. In 1 and 2, Ca2+ is seven-coordinate and forms a monocapped trigonal prism. In 1, the prisms are pairwise connected with the assistance of two [μ2-HTBA-O,O′]− ligands. In 3, Sr2+ is coordinated by four monodentate HTBA− via S or O donors and four waters, with the formation of a distorted square antiprism. The antiprisms are connected by μ2-O,S bridging HTBA−. Hydrogen bonding involving coordinated water and π–π interactions plays an important role in construction of the supramolecular 3-D structures in 1–3. Infrared spectroscopic data supported the structural data. The thermal stability of 1–3 decreases in the order 1 2 3. Dehydration of 1–3 was a multi-step process, followed by exothermic oxidative degradation of the 2-thiobarbiturate moiety between 290 and 800 °C.
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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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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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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
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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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
Шифр издания :
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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Komogortsev S. V., Chizhik N. A., Filatov E. Yu., Korenev S. V., Shubin Yu.V., Velikanov D. A., Iskhakov R. S., Yurkin G.Yu.
Заглавие : Magnetic properties and L1 0 phase formation in CoPt nanoparticles
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.159-162. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.190.159. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): hard magnetic--magnetic anisotropy--magnetic nanoparticles--remnant magnetization--annealing time--copt nanoparticles--disorder-order--domain formation--hard magnetic--magnetic anisotropy energy--magnetic nanoparticles--phase formations--remnant magnetization--decomposition--magnetic anisotropy--magnetic materials--remanence--nanoparticles
Аннотация: The effect of the atomic disorder-order transformation on remanence, coercivity and magnetic anisotropy energy in CoPt nanoparticles prepared by thermal decomposition and annealed at 400oC for 4 and 16 hours has been studied. The observed remanence and magnetic anisotropy energy enhancement versus annealing time are discussed in the terms of ordering domain formation inside nanoparticles. В© (2012) Trans Tech Publications.
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10.

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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