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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokina T. V., Petrakovskii G. A., Molokeev M. S., Velikanov D. A.
Заглавие : Synthesis, crystal structure, and magnetic properties of the YbFeTi2O7 compound
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 3. - P.532-536. - ISSN 1063-7834, DOI 10.1134/S1063783418030095. - ISSN 1090-6460(eISSN)
Примечания : Cited References:13
Предметные рубрики: STATE
Аннотация: We report on the synthesis conductions and results of experimental investigations of the crystal structure and magnetic properties of a new magnetic compound YbFeTi2O7. According to the X-ray diffractometry data, the crystal structure of the investigated compound is described by the rhombic space group Pcnb with unit cell parameters of a = 9.8115(1) Å, b = 13.5106(2) Å, and c = 7.31302(9) Å and atomic disordering in the distribution of iron ions Fe3+ over five structural sites. The magnetic measurements in the lowtemperature region revealed a kink in the temperature dependence of the magnetic moment and its dependence on the sample magnetic prehistory. The experimental results obtained suggest that with a decrease in temperature the sample passes from the paramagnetic state to the spin-glass-like magnetic state characterized by a freezing temperature of T f = 4.5 K at the preferred antiferromagnetic exchange coupling in the sample spin system. The chemical pressure variation upon replacement of rare-earth ion R by Yb in the RFeTi2O7 system does not change the crystal lattice symmetry and magnetic state.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kirenskii L. V., Pynko V. G., Obrastsova L. M.
Заглавие : Domain structure of double layer single crystal films of iron
Место публикации : Czech. J. Phys. - 1971. - Vol. B21, no. 4-5. - P.513-515. - ISSN 0011-4626
Предметные рубрики: SPIN-PEIERLS TRANSITION
COMPOUND CUGEO3
SYSTEM CUGEO3
STATE
Аннотация: The magnetostriction of CuGcO(3) single crystals has been measured in the temperature range from 5 to 16 K in magnetic fields up to 12 T. Giant values of the magnetostrictive strains along the b-axis is observed near the phase transition from the dimerized phase to the high field magnetic phase. The field induced magnetostriction in the antiferromagnetic phase is considerably smaller than in the dimerized phase.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Arauzo A., Bartolomé J., Drokina T. V., Petrakovskii G. A., Molokeev M. S.
Заглавие : Spin glass magnetic behavior in GdFeTi2O7 compound
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.4PO-I1-34. - P.889 (Шифр 29916280)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasiliev A. D., Golovnev N. N.
Заглавие : Structure of the oxonium compound of pefloxacinium hexachloridostannate(IV)
Коллективы : Ministry of Education of the Russian Federation [4.7666.2017/BCh]; Siberian Federal University [4.7666.2017/BCh]
Место публикации : J. Struct. Chem. - 2018. - Vol. 59, Is. 3. - P.641-645. - ISSN 0022-4766, DOI 10.1134/S0022476618030198. - ISSN 1573-8779(eISSN)
Примечания : Cited References: 13. - The work was performed within the State Contact of the Ministry of Education of the Russian Federation and the Siberian Federal University in 2017-2019 (4.7666.2017/BCh)
Предметные рубрики: ANTIBACTERIAL AGENTS
QUINOLONE
Ключевые слова (''Своб.индексиров.''): pefloxacinium cation--oxonium cation--chloride ion--hexachloridostannate(iv) anion--ionic compound--crystal structure
Аннотация: The structure of tris{hexachloridostannate(IV)}-hexachloride-tetrakis(pefloxacinium)-tetraoxonium undecahydrate (CCDC 1551760) 4PefH 3 2+ , 4H3O+, 3SnCl 6 2− , 6Cl−, 11H2O (I), (PefH is pefloxacin) is determined. The I crystals are triclinic: a = 13.5474(10) Å, b = 15.2859(11) Å, c = 15.6586(11) Å, α = 94.467(1)°, β = 105.477(1)°, γ = 111.560(1)°, V = 2849.9(4) Å3, space group Pī, Z = 1. The structure is stabilized by multiple intermolecular hydrogen bonds and π–π-interactions between the PefH32+ ions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wu, Po-Chang, Chen, Hsin-Li, Rudakova, Natalya V., Timofeev I. V., Zyryanov V. Ya., Lee, Wei
Заглавие : Electro-optical and dielectric properties of polymer-stabilized blue phase liquid crystal impregnated with a fluorine-containing compound
Коллективы : Ministry of Science and Technology, Taiwan [104-2112-M-009-008-MY3, 106-2923-M-009-002-MY3]; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-240704, 17-42-240464]
Место публикации : J. Mol. Liq. - 2018. - Vol. 267. - P.138-143. - ISSN 0167-7322, DOI 10.1016/j.molliq.2017.12.062. - ISSN 1873-3166(eISSN)
Примечания : Cited References: 47. - The authors are indebted to Prof. Mon-Juan Lee of Chang-Jung Christian University for valuable discussions on photopolymerization. This work was financially supported by the Ministry of Science and Technology, Taiwan, through Grant Nos. 104-2112-M-009-008-MY3 and 106-2923-M-009-002-MY3, and by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research projects 16-42-240704 and 17-42-240464.
Предметные рубрики: HYSTERESIS
TEMPERATURE
MONOMERS
Ключевые слова (''Своб.индексиров.''): polymer-stabilized blue phase--liquid crystal--fluorine-containing--compound--operating voltage--ionic effect
Аннотация: The effects of a fluorine-containing compound (4,4′-difluorobenzophenone; DF) on the electro-optical and dielectric properties of polymer-stabilized blue phase (PSBP) liquid crystals were investigated. When a PSBP cell was driven by an in-plane electric field, the addition of DF up to 2.7 wt% effectively reduced the operation voltage by ~ 30%. Further inspection by dielectric spectroscopy indicated that the ionic concentration in PSBP decreased with increasing loading of DF. This finding can be ascribed to the complexation of impurity ions near the ketone group and carbon–fluorine bonds of the DF compound that restrained the ion transport after photopolymerization. As a result, the DF compound can be regarded as a superior ion-suppressor, enabling the reduction in the ionic effect and, in turn, the promotion of the electro-optical response of a PSBP.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zharkov S. M., Moiseenko E. T., Altunin R. R.
Заглавие : L10 ordered phase formation at solid state reactions in Cu/Au and Fe/Pd thin films
Место публикации : J. Solid State Chem. - 2019. - Vol. 269. - P.36-42. - ISSN 00224596 (ISSN) , DOI 10.1016/j.jssc.2018.09.009
Примечания : Cited References: 36. - The investigation of Cu/Au system was conducted under the financial support of the Russian Science Foundation (Grant #18-13-00080) and the investigation of Fe/Pd system was supported by the Russian Foundation for Basic Research (Grant #18-03-01173).
Ключевые слова (''Своб.индексиров.''): thin film solid state reaction--intermetallic compound--l10 type ordered structure--order/disorder transformation--in situ ed
Аннотация: To understand the mechanism of mass transfer during solid state reactions and order-disorder transitions the formation processes of CuAuI and L10-FePd ordered structures at solid state reactions in Cu/Au и Fe/Pd bilayer thin films have been carried out using the method of in situ electron diffraction (ED). The value of the long-range order (LRO) parameter has been estimated for the L10 type ordered structures being formed; the order-disorder transition temperatures have been determined. The formation mechanism of the L10 type ordered structures formed at the initial stages of the solid state reaction in the Cu/Au and Fe/Pd thin films has been suggested. In the case of Cu/Au it has been shown that the interdiffusion of copper and gold at the initial stage of the solid state reaction results in the reduced size of the grains of the initial materials, as a result, nanocrystalites of the Cu-Au solid solution are formed, and further, grains of the CuAuI ordered solid solution appear and their growth begins.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Larionov K. V., Popov Z. I., Vysotin M. A., Kvashnin D. G., Sorokin P. B.
Заглавие : Study of the new two-dimensional compound CoC
Коллективы : Russian Science Foundation [17-72-20223]; Ministry of Education and Science of the Russian Federation [14.Y26.31.0005]; Joint Supercomputer Center, Russian Academy of Sciences
Место публикации : JETP Letters. - 2018. - Vol. 108, Is. 1. - P.13-17. - ISSN 0021-3640, DOI 10.1134/S0021364018130106. - ISSN 1090-6487(eISSN)
Примечания : Cited References: 24. - We are grateful to Prof. Gotthard Seifert, Prof. B.P. Sorokin, and Prof. L.A. Chernozatonskii for the discussion of the results. This work was supported by the Russian Science Foundation (project no. 17-72-20223). The calculations were performed with the use of resources of the Computer Cluster, Materials Modeling and Development Laboratory, National University of Science and Technology MISiS (supported by the Ministry of Education and Science of the Russian Federation, project no. 14.Y26.31.0005), and the Joint Supercomputer Center, Russian Academy of Sciences.
Предметные рубрики: TOTAL-ENERGY CALCULATIONS
WAVE BASIS-SET
AB-INITIO
DYNAMICS
Аннотация: A novel quasi-two-dimensional monolayer structure with orthorhombic symmetry based on cobalt carbide, o-CoC, has been considered. This structure supplements a recently discovered family of quasi-two-dimensional compounds based on transition metals. The dynamic stability of a monolayer has been demonstrated. Its mechanical and electronic characteristics have been studied.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Semenov S. V., Gokhfeld D. M., Balaev D. A., Yakimov I. S., Petrov M. I.
Заглавие : Tuning the peak effect by in Y1-xNdxBa2Cu3O7-δ compound by Nd doping
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.3PO-I-19. - P.576
Примечания : Библиогр.: 4
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Sterkhova, Irina V., Atuchin V. V., Sidorenko, Maxim Y.
Заглавие : Hydrates [Na2(H2O)x](2-thiobarbiturate)2 (x = 3, 4, 5): crystal structure, spectroscopic and thermal properties
Коллективы : Ministry of Education and Science of the Russian Federation [3049]
Место публикации : J. Coord. Chem.: Taylor & Francis, 2016. - Vol. 69, Is. 21. - P.3219-3230. - ISSN 0095-8972, DOI 10.1080/00958972.2016.1228914. - ISSN 1029-0389(eISSN)
Примечания : Cited References:33. - This work was supported by the the Ministry of Education and Science of the Russian Federation for research engineering of the Siberian Federal University [grant number 3049].
Предметные рубрики: 2-THIOBARBITURIC ACID
COMPLEXES
1,3-DIETHYL-2-THIOBARBITURATE
TRANSFORMATION
CESIUM
Na
Li
Ключевые слова (''Своб.индексиров.''): 2-thiobarbituric acid--sodium--coordination compound--x-ray diffraction--infrared spectroscopy--thermal analysis
Аннотация: The hydrates [Na2(H2O)3(Htba)2] (1) and [Na2(H2O)4(Htba)2] (2), where H2tba is 2-thiobarbituric acid, were obtained under different thermal conditions from aqueous solutions and were structurally characterized. The molecular and supramolecular structures were compared to the known structure of [Na2(H2O)5(Htba)2] (3). In polymeric 1–3, the Htba− ions are linked to Na+ through O and S forming octahedra. The decrease of the number of coordination water molecules led to an increase of the total number of bridge ligands (μ2-H2O, Htba−) and a change of the Htba− coordination. These factors induced higher distortion of the octahedra. It was assumed that hydrates, with a different number of coordinated water molecules, are more probable when the central metal has weaker bonds with O water molecules and with other ligands. The net topologies of 1–3 were compared. Thermal decomposition and IR spectra were analyzed for 1 and 2.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokina T. V., Petrakovskii G. A., Bayukov O. A., Vorotynov A. M., Velikanov D. A., Molokeev M. S.
Заглавие : Synthesis and structural, magnetic, and resonance properties of the LiCuFe2(VO4)3 compound
Место публикации : Phys. Solid State: Maik Nauka-Interperiodica Publishing, 2016. - Vol. 58, Is. 10. - P.1981-1988. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416100139
Примечания : Cited References: 15
Аннотация: Complex studies have been performed for the structural, static magnetic, and resonance properties of a new magnet LiCuFe2(VO4)3 prepared by solid-phase synthesis. The temperature dependence of the susceptibility has an anomaly at temperature Tmax = 9.6 K. At high temperatures, the LiCuFe2(VO4)3 sample is in the paramagnetic state described by the Curie–Weiss law at T 50 K and mainly determined by iron ions with effective magnetic moment μeff(exp) = 8.6μB per formula unit. At low temperatures, a long-range magnetic order is observed in the magnetic subsystem of the sample; the order is predominantly characterized by the antiferromagnetic exchange interaction and high frustration level. The exchange interaction parameters are estimated in a six-sublattice representation of the LiCuFe2(VO4)3 magnet. It is shown that the LiCuFe2(VO4)3 compound is an antiferromagnet with strong intrachain and frustrating interchain exchange interactions.
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