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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Wannier-Stark states and topological phase transitions in tilted two-dimensional bipartite lattices
Коллективы : Controlling quantum matter: From ultracold atoms to solids, Humboldt Kolleg, Vilnius University, Lithuanian Physical Society
Место публикации : Humboldt Kolleg. Controlling quantum matter: From ultracold atoms to solids: conference materials. - 2018
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorotynov A. M., Ovchinnikov S. G., Rudenko V. V.
Заглавие : Uniaxial and basal plane anisotropy caused by Cr2+ impurity ions in CrBO3 crystals
Место публикации : J. Phys. Chem. Solids. - 2018. - Vol. 123. - P.389-392. - ISSN 00223697 (ISSN), DOI 10.1016/j.jpcs.2018.08.016
Примечания : Cited References: 14
Ключевые слова (''Своб.индексиров.''): anisotropy--chromium compounds--crystal impurities--ions--single crystals
Аннотация: IIn this study, the uniaxial and basal anisotropy governed by Cr2+ impurity ions was treated based on the Cr2+– BO3 3− ion vacancy model using single ion approximation. The anomalous behavior of the basal anisotropy at low temperatures was predicted.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen M., Xia Z., Molokeev M. S., Wang T., Liu Q.
Заглавие : Tuning of photoluminescence and local structures of substituted cations in xSr2Ca(PO4)2-(1 - x)Ca10Li(PO4)7:Eu2+ phosphors
Место публикации : Chem. Mater.: American Chemical Society, 2017. - Vol. 29, Is. 3. - P.1430-1438. - ISSN 08974756 (ISSN), DOI 10.1021/acs.chemmater.7b00006
Примечания : Cited References: 37. - The present work was supported by the National Natural Science Foundation of China (Grants 91622125 and 51572023), Natural Science Foundations of Beijing (2172036), and Fundamental Research Funds for the Central Universities (FRF-TP-15-003A2).
Ключевые слова (''Своб.индексиров.''): calcium--energy transfer--europium--light emission--lithium--luminescence--phosphors--photoionization--photoluminescence--single crystals--composition ranges--crystal-field splitting--luminescence measurements--non-linear variation--photoionization process--polyhedra distortion--rare earth doped solids--temperature dependent--solid solutions
Аннотация: Local structure modification in solid solution is an essential part of photoluminescence tuning of rare earth doped solid state phosphors. Herein we report a new solid solution phosphor of Eu2+-doped xSr2Ca(PO4)2-(1 - x)Ca10Li(PO4)7 (0 ≤ x ≤ 1), which share the same β-Ca3(PO4)2 type structure in the full composition range. Depending on the x parameter variation in xSr2Ca(PO4)2-(1 - x)Ca10Li(PO4)7:Eu2+, the vacancies generated in the M(4) site enable the nonlinear variation of cell parameters and volume, and this increases the magnitude of M(4)O6 polyhedra distortion. The local structure modulation around the Eu2+ ions causes different luminescent behaviors of the two-peak emission and induces the photoluminescence tuning. The shift of the emission peaks in the solid solution phosphors with different compositions has been discussed. It remains invariable at x ≤ 0.5, but the red-shift is observed at x 0.5 which is attributed to combined effect of the crystal field splitting, Stokes shift, and energy transfer between Eu2+ ions. The temperature-dependent luminescence measurements are also performed, and it is shown that the photoionization process is responsible for the quenching effect.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kveglis L. I., Kuzovnikov A. V., Timofeev I. V.
Заглавие : The self-organization of tetrahedrally close-packed structures in magnetic nanocrystalline Tb-Fe and Co-Pd films
Коллективы : International Conference on Mechanical Spectroscopy and Relaxation Phenomena in Solids (3; 2006; Cracow, Poland)
Место публикации : Mechanical spectroscopy III: Mechanical spectroscopy and relaxation phenomena IN SOLIDS. Ser. Solid state phenomena: Trans tech publications LTD, 2006. - Vol. 115. - P.267-273. - ISBN 1012-0394. - ISBN 3-908451-24-8
Примечания : Cited References: 19
Предметные рубрики: AMORPHOUS FILMS
Ключевые слова (''Своб.индексиров.''): dissipative structures--explosive crystallization--thermal conductivity--tb-fe films--co-pd films
Аннотация: The self-organization of an atomic structure in Tb30Fe70 and Co50Pd50 films possessing of high values of the perpendicular magnetic anisotropy (PMA) constant (K perpendicular to similar to 10(6) erg/cm(3)) is investigated by transmission electron microscopy. The crystallization of the films is realized in an explosive way with formation of different dissipative structures from the initial nanocrystalline state. In present work the structural model of a thin film in mezzo-scale and the correlation of a structure with magnetic properties are discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kovaleva E. A., Melchakova I., Mikhaleva N. S., Tomilin F. N., Ovchinnikov S. G., Baek W., Pomogaev V. A., Avramov P. V., Kuzubov A. A.
Заглавие : The role of strong electron correlations in determination of band structure and charge distribution of transition metal dihalide monolayers
Место публикации : J. Phys. Chem. Solids. - 2019. - Vol. 134. - P.324-332. - ISSN 00223697 (ISSN), DOI 10.1016/j.jpcs.2019.05.036
Примечания : Cited References: 44. - This work was supported by the government contract of the Ministry of Education and Science of the Russian Federation, Russia to Siberian Federal University (Grant No. 16.1455.2017/PCh ) and Russian Foundation for Basic Research (RFBR), Russia (Grant No. 16-32-60003 mol_a_dk), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project: “Quantum chemical modeling of Bychkov-Rashba interfaces based on transition metal compounds and nanoscaled organic fragments” (Project No. 18-43-243011). The authors would like to thank Joint Supercomputer Center of RAS , Moscow; Center of Equipment for Joint Use of Siberian Federal University , Krasnoyarsk; and Information Technology Center, Novosibirsk State University for providing the access to their supercomputers. N.S.M. acknowledges the financial support of the RFBR , through the research project No. 16-32-60003 mol_a_dk. E.A. Kovaleva is grateful to the Foundation for Assistance to Small Innovative Enterprises (FASIE), Russia (Project no. 0033639 ). W.B. and P.A. gratefully acknowledge the financial support of National Research Foundation of Republic of Korea under the Grant No. NRF-2017R1A2B4004440.
Аннотация: Electronic structure and magnetic properties of the family of first-row transition metal dihalides (TMHal2, TM = V, Cr, Mn, Fe, Co, Ni; H = Br, I) monolayers were studied by means of density functional theory. Strong electron correlations were taken into account by implementing Hubbard U correction in a simplified scheme proposed by Dudarev et al. (Ueff). Ueff correction essentially affects electronic structure of TMHal2 widening the band gap and witnessing their highly spin-polarized nature. Two different ligand orientations namely, H and T configurations of monolayers were considered. Unlike others, FeHal2 monolayers tend to form H structure when Ueff correction is included. © 2019 Elsevier Ltd
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Tressaud A., Durand E.
Заглавие : The p-T phase diagram of ammonium hexafluoroaluminate
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2002. - Vol. 14, Is. 25. - P6447-6453. - ISSN 0953-8984, DOI 10.1088/0953-8984/14/25/312
Примечания : Cited References: 17
Предметные рубрики: NUCLEAR MAGNETIC-RESONANCE
TRANSITIONS
MOTIONS
F-19
H-1
Ключевые слова (''Своб.индексиров.''): entropy--hydrostatic pressing--mathematical models--order disorder transitions--phase diagrams--specific heat of solids--ammonium hexafluoroaluminate--crolite--elpasolite--ammonium compounds
Аннотация: The heat capacity and the effect of hydrostatic pressure on structural phase transitions in ammonium hexafluoroaluminate, (NH4)(3)AlF6, have been studied. Two heat capacity anomalies have been found with maxima at T-1 = 218.5 +/- 0.5 K and T-2 = 179 +/- 2 K. Respective entropy changes of phase transitions are DeltaS(1) = 15.3 +/- 0.5 J mol(-1) K-1 and DeltaS(2) = 2.5 +/- 0.5 J mol(-1) K-1. It is shown that the p-T phase diagram of this compound is rather complex and contains a triple point (p(tp) = 0.12 GPa, T-tp = 221 K) and high-pressure phase. The mechanism of transformations and generalized p-T phase diagram for compounds of the (NH4)(3)(MF6)-F-III family are discussed within the framework of the rotational order-disorder model.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ronzhin N. O., Posokhina E. D., Mikhlina E. V., Shestakov N. P., Nemtsev I. V., Bondar V. S., Ryzhkov I. I.
Заглавие : The effect of copper and iron adsorption on the catalytic performance of alumina nanofiber / nanodiamond composite in sensing applications
Место публикации : J. Phys. Chem. Solids. - 2022. - Vol. 167. - Ст.110785. - ISSN 00223697 (ISSN), DOI 10.1016/j.jpcs.2022.110785
Примечания : Cited References: 68. - This work is supported by the Russian Foundation for Basic Research, Project 18–29–19078. The authors would like to express their special thanks to Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS» for providing the equipment to ensure the accomplishment of this project
Аннотация: Phenolic compounds are common environmental pollutants, which are used in many industries and contaminate water environment due to industrial wastewater discharge. Presently, there is an increasing demand for the development and improvement of inexpensive, easy-to-use analytical tools for in-situ detection of phenolic compounds. In this work, we investigate the effect of adsorption of Cu2+ and Fe2+ ions on the catalytic activity of a composite material based on alumina nanofibers (ANF) and detonation nanodiamonds (DND) in the co-oxidation of phenols with 4-aminoantipyrine in the presence of hydrogen peroxide. We have found more than two-fold increase of the catalytic activity for ANF + DND + Cu composite, while the activity of ANF + DND + Fe composite is found to decrease by several times in comparison with the original ANF + DND material. The results of FTIR analysis indicate that the adsorption of iron ions occurs with the formation of hydroxide surface groups and hydrogen bonds, which apparently block their catalytic activity in the Fenton redox cycle. The higher catalytic performance of AND + DND composite functionalized with copper ions makes it possible to detect two times lower concentrations of analytes (phenol and 4-chlorophenol) in comparison with the original composite. It is shown that the AND + DND + Cu composite provides a linear yield of the co-oxidation reaction product in a wide range of analyte concentrations (0.25–100 μM for phenol and 0.5–25 μM for 4-chlorophenol). Model experiments demonstrate the applicability of copper-functionalized composite as a reusable sensor for the determination of phenol in aqueous samples.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lundin A. G., Makarenko A. V., Zobov V. E.
Заглавие : The dipolar fluctuation spectrum and the shape of the wings of nuclear-magnetic-resonance absorption-spectra in solids
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 1990. - Vol. 2, Is. 50. - P.10131-10145. - ISSN 0953-8984, DOI 10.1088/0953-8984/2/50/017
Примечания : Cited References: 24
Предметные рубрики: CROSS RELAXATION
Аннотация: A theoretical approach providing the shape of the spectrum of dipolar fluctuations (Fourier transform of the longitudinal component of magnetization) and shape of the wings of NMR absorption in condensed matter has been elaborated. It is shown that the spectral contours are exponentials with the same decay constant. The results obtained explain for the first time the known experimental data and establish a connection between two groups of different experiments. The theoretical prediction is in good agreement with experimental results.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Mironov V. L., Karavaisky A. Yu.
Заглавие : Temperature dependent dielectric model at 1.4 GHz for an agricultural soil thawed and frozen
Коллективы : International Siberian Conference on Control and Communications
Место публикации : Int. Sib. Conf. on Control and Communicat. (SIBCON 2015): Proceedings: IEEE-Institute Electrical and Electronics Engineers, 2015. - P.1-4. - , DOI 10.1109/SIBCON.2015.7147092
Примечания : Cited References:9
Ключевые слова (''Своб.индексиров.''): agricultural soil--dielectric model--moisture--remote sensing--temperature--thawed and frozen soil--agriculture--frozen soils--mixing--moisture--refractive index--remote sensing--soil moisture--soils--temperature--thawing--agricultural soils--complex refractive index--dielectric measurements--dielectric modeling--measurements of--mixing models--soil solids--temperature dependent--soil surveys
Аннотация: A mono-frequency dielectric model for the agricultural soil both thawed and frozen has been developed. The model is based on the soil dielectric measurements carried out in the ranges of volumetric moisture from 0,03 to 0,51 cm3/ cm3, dry soil density from 1.12 to 1.64 g/cm3, and temperature from -30 to 25°C (heating run), at the frequency of 1.4 GHz used in the SMOS mission. To fit the results of measurements of the soil complex refractive index (CRI) as a function of soil moisture, the refractive mixing model was applied. As a result, the parameters of the refractive mixing model linked to soil solids, as well as the bound, transient, and free soil water components were derived as a function of temperature. The error of the proposed dielectric model was shown to be in the order of the dielectric measurement error itself. © 2015 IEEE.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Val'kov V. V., Dzebisashvili D. M., Korovushkin M. M., Barabanov A. F.
Заглавие : Stability of the superconducting d-wave pairing towards the Coulomb repulsions in cuprate superconductors
Коллективы : International symposium on strong nonlinear vibronic and electronic interactions in solids
Место публикации : VI International symposium on strong nonlinear vibronic and electronic interactions in solids: book of abstracts . - 2018. - P.33
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