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

Главная

Базы данных

Труды сотрудников ИФ СО РАН - результаты поиска

Вид поиска

Каталог книг и брошюр библиотеки ИФ СО РАН

Каталог журналов библиотеки ИФ СО РАН

Труды сотрудников ИФ СО РАН

Область поиска

в найденном

Найдено в других БД:

Каталог книг и брошюр библиотеки ИФ СО РАН (1)

Формат представления найденных документов:
полный	информационный	краткий

Отсортировать найденные документы по:
автору	заглавию	году издания	типу документа

Поисковый запрос: (<.>K=Sodium<.>)

Общее количество найденных документов : 31
Показаны документы с 1 по 20

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorelik V. S., Pyatyshev A. Y., Krylov A. S.
Заглавие : Raman scattering in a ferroelectric sodium nitrite crystal
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press Incorporation, 2016. - Vol. 80, Is. 9. - P.1127-1130. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873816090136
Примечания : Cited References: 25
Ключевые слова (''Своб.индексиров.''): ferroelectric devices--ferroelectricity--raman scattering--sodium--ferroelectric phase transition--overdamped--sodium nitrite--soft modes--wide spectral range--ferroelectric materials
Аннотация: Raman spectra of the ferroelectric sodium nitrite are recorded over a wide spectral range at different temperatures, including the ferroelectric phase transition interval. The room-temperature Raman spectrum reveals the overdamped А1(z) soft mode which is attributed to the ferroelectric phase transition. © 2016, Allerton Press, Inc.
Смотреть статью,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Bondarev V. S., Raevskaya S. I., Flerov I. N., Malitskaya M. A., Raevskii I. P.
Заглавие : Thermophysical study of structural phase transitions in Na0.95Li0.05NbO3 solid solution
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2016. - Vol. 80, Is. 9. - P.1046-1050. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873816090148
Примечания : Cited References: 18. - This work was supported by Southern Federal University, project no. 213.01-2014/012-VG.
Ключевые слова (''Своб.индексиров.''): niobium oxide--sodium--specific heat--temperature distribution--thermal expansion--ceramic samples--effect of heat treatments--possible mechanisms--sodium lithium niobate--structural distortions--structural phase transition--temperature dependence--temperature range--lithium
Аннотация: Temperature dependences of specific heat Cp(T) and coefficient of thermal expansion α(T) for Na0.95Li0.05NbO3 sodium-lithium niobate ceramic samples are investigated in the temperature range of 100–800 K. The Cp(T) and α(T) anomalies at T3 = 310 ± 3 K, T2 = 630 ± 8 K, and T1 = 710 ± 10 K are observed, which correspond to the sequence of phase transitions N ↔ Q ↔ S(R) ↔ T2(S). The effect of heat treatment of the samples on the sequence of structural distortions was established. It is demonstrated that annealing of the samples at 603 K leads to splitting of the anomaly corresponding to the phase transition Q → R/S in two anomalies. After sample heating to 800 K, the only anomaly is observed in both the Cp(T) and α(T) dependence. Possible mechanisms of the observed phenomena are discussed.
Смотреть статью,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Logutenko O. A., Titkov A. I., Vorob'yov A. M., Balaev D. A., Shaikhutdinov K. A., Semenov S. V., Yukhin Y. M., Lyakhov N. Z.
Заглавие : Effect of molecular weight of sodium polyacrylates on the size and morphology of nickel nanoparticles synthesized by the modified polyol method and their magnetic properties
Место публикации : Eur. Polym. J. - 2018. - Vol. 99. - P.102-110. - ISSN 00143057 (ISSN), DOI 10.1016/j.eurpolymj.2017.12.017
Примечания : Cited References: 26. - This work was supported by the Russian Science Foundation, research project No. 15-13-00113.
Ключевые слова (''Своб.индексиров.''): nickel nanoparticles--sodium polyacrylate--polyol--reduction--magnetic properties
Аннотация: Nickel nanoparticles were synthesized by the reduction of nickel chloride with hydrazine hydrate in a polyol medium in the presence of sodium polyacrylates (Na-PA) having molecular weights (Mw) of 1200, 5100 and 8000. The size and morphology of the resulting nickel nanoparticles were characterized by X-ray diffraction, scanning and transmission electron microscopy. Polymers having lower Mw values were found to be more efficient in reducing the nickel particle size. A decrease in the polymer concentrations yielded the smaller particles. Magnetic measurements showed that the as-prepared powders are ferromagnetic and their saturation magnetization and coercivity are size-dependent. Compared with bulk nickel, the nanoparticles exhibit an enhanced coercivity which is due to their small size and a decreased saturation magnetization resulted from the surface oxidation of the powder. The synthesis procedure offers a simple approach to preparing nickel nanopowders on a large scale which could be used as magnetic recording materials, including high-density memory storage devices.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorelik V. S., Pyatyshev, A. Yu., Krylov A. S.
Заглавие : Raman light scattering in sodium nitrite crystals
Коллективы : Russian Foundation for Basic Research [12-02-00491, 13-02-00449, 13-02-90420, 14-02-00190]
Место публикации : Bull. Lebedev Phys. Inst.: Allerton Press, 2016. - Vol. 43, Is. 5. - P.167-173. - ISSN 1068-3356, DOI 10.3103/S1068335616050043. - ISSN 1934-838X(eISSN)
Примечания : Cited References:37. - This study was supported by the Russian Foundation for Basic Research, projects nos. 12-02-00491, 13-02-00449,13-02-90420, 14-02-00190.
Предметные рубрики: NANO2
PHASE
SPECTROSCOPY
PARAPHOTONS
DEPENDENCE
SPECTRUM
SEARCH
Ключевые слова (''Своб.индексиров.''): sodium nitrite--raman scattering--spectrum--polar mode--polariton--ferroelectric--dispersion curves
Аннотация: Raman light scattering spectra of a ferroelectric sodium nitrite crystal is studied in the lattice mode region as the temperature is lowered from room temperature to 123 K. The existence of a Raman satellite corresponding to the soft lattice mode, i.e., transverse polar vibration responsible for the ferroelectric phase transition, is established for the first time. It is found that the intensity of the Raman scattering by the pseudo-scalar low-frequency A (2) mode exceeds the intensity of other lattice variations by an order of magnitude.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Donkov A., Eremin I., Knolle J., Korshunov M. M.
Заглавие : Electron-Phonon Interaction and Phonon Renormalization in the Lamellar Cobaltate NaxCoO2
Разночтения заглавия :авие SCOPUS: Electron-phonon interaction and phonon renormalization in the lamellar cobaltate Na x CoO 2
Место публикации : J. Supercond. Nov. Magn.: SPRINGER, 2009. - Vol. 22: International Conference on Quantum Phenomena in Complex Matters (JUL 26-AUG 01, 2008, Erice, ITALY), Is. 1. - P37-40. - ISSN 1557-1939, DOI 10.1007/s10948-008-0372-6
Примечания : Cited References: 16
Предметные рубрики: SUPERCONDUCTIVITY
Ключевые слова (''Своб.индексиров.''): electron-phonon interaction--superconductivity--sodium cobaltate--electron-phonon interaction--sodium cobaltate--superconductivity--brillouin zones--cobaltate--conducting electrons--conduction electrons--doping dependences--feedback effects--matrix elements--phonon frequencies--phonon modes--raman experiments--renormalization--sodium cobaltate--sodium cobaltates--atoms--cobalt compounds--critical current density (superconductivity)--electric conductivity--electron-phonon interactions--electrons--flow interactions--penetration depth (superconductivity)--sodium--superconductivity--phonons
Аннотация: We study theoretically the electron-phonon interaction in NaxCoO2. For the A(1g) and E-1g phonon modes found in Raman experiments, we calculate the matrix elements of the electron-phonon interaction. Analyzing the feedback effect of the conduction electrons on the phonon frequency., we investigate the doping dependence of these two phonon modes. Due to the momentum dependence of the electron-phonon interaction, we find the strongest renormalization of the E-1g mode around the Brillouin zone boundary which should be observed in the neutron scattering. At the same time, the A(1g) mode shows the strongest coupling to the conducting electrons around the G point and reveals its doping dependence in the Raman experiments. Our results shed light on the possible importance of the electron-phonon interaction in the lamellar sodium cobaltates.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov A. K., Myslivets S. A., Gao J. Y., Zhang H. Z., Wellegehausen B.
Заглавие : Inversionless gain in a three-level system driven by a strong field and collisions
Место публикации : Chin. Phys. - 2000. - Vol. 9, Is. 2. - P.124-130. - ISSN 1009-1963
Примечания : Cited References: 45
Предметные рубрики: ELECTROMAGNETICALLY INDUCED TRANSPARENCY
POPULATION-INVERSION
LIGHT AMPLIFICATION
QUANTUM COHERENCE
REFRACTIVE-INDEX
LASER
INTERFERENCE
TRANSITIONS
SODIUM
ATOMS
Аннотация: Inversionless gain in a degenerate three-level system driven by a strong external field and by collisions with a buffer gas is investigated. The mechanism of population distribution in upper laser level, contributed by the collision transfer, as well as by relaxation, induced by pressure of a buffer gas, is discussed in detail. Explicit formulae for analysis of optimal conditions are derived. The idea developed here for the incoherent pump could be generalized to other systems.
WOS,
Читать в сети ИФ
Найти похожие

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.
Смотреть статью,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jiang C., Brik M. G., Li L., Li L., Peng J., Wu J., Molokeev M. S., Wong K. -L., Peng M.
Заглавие : The electronic and optical properties of a narrow-band red-emitting nanophosphor K2NaGaF6:Mn4+ for warm white light-emitting diodes
Место публикации : J. Mater. Chem. C. - 2018. - Vol. 6, Is. 12. - P.3016-3025. - ISSN 20507534 (ISSN), DOI 10.1039/c7tc05098d
Примечания : Cited References: 55. - We acknowledge the financial support received from the Program for Innovative Research Team in University of Ministry of Education of China (Grant No. IRT_17R38), the Key Program of Guangzhou Scientific Research Special Project (Grant No. 201607020009), the National Natural Science Foundation of China (Grant No. 51672085, 51322208, 3160440), and the Fundamental Research Funds for the Central Universities. M. G. Brik acknowledges the supports received from the Recruitment Program of High-end Foreign Experts (Grant No. GDW20145200225), the Programme for the Foreign Experts offered by Chongqing University of Posts and Telecommunications, Ministry of Education and Research of Estonia, (Project PUT430) and European Regional Development Fund (Project TK141), and the Guest Professorship at Kyoto University (Prof. S. Tanabe laboratory). The first-principles calculations were carried out using the resources provided by the Wroclaw centre for Networking and Supercomputing (http://wcss.pl; Grant No. WCSS#10117290).
Ключевые слова (''Своб.индексиров.''): energy efficiency--gallium compounds--light emission--light emitting diodes--manganese--manganese compounds--optical properties--phosphors--precipitation (chemical)--quenching--rietveld refinement--sodium compounds
Аннотация: Recently, as a key red component in the development of warm white light-emitting diodes (WLEDs), Recently, as a key red component in the development of warm white light-emitting diodes (WLEDs), Mn4+-doped fluorides with narrow red emission have sparked rapidly growing interest because they improve color rendition and enhance the visual energy efficiency. Herein, a red nanophosphor, K2NaGaF6:Mn4+, with a diameter of 150-250 nm has been synthesized using a simple co-precipitation method. Rietveld refinement reveals that it crystallizes in the space group Fm3m with the cell parameter a = 8.25320(4) Å. The exchange charge model (ECM) has been used to calculate the energy levels of Mn4+ ions in K2NaGaF6, which match well with the experimental spectra. The as-synthesized phosphor exhibits a narrow red emission at around 630 nm (spin-forbidden 2Eg → 4A2 transition of Mn4+ ions) when excited at 365 nm (4A2g → 4T1g) and 467 nm (4A2g → 4T2g), with a quantum efficiency (QE) of 61% and good resistance to thermal quenching. Based on the structure, the formation mechanism of ZPL has been discussed. In addition, the concentration-dependent decay curves of Mn4+ in K2NaGaF6 were fitted using the Inokuti-Hirayama model, suggesting that the dipole-dipole interactions determine the concentration quenching. Finally, encouraged by the good performance, a warm LED with a CRI of 89.4 and CCT of 3779 K was fabricated by employing the title nanophosphor as the red component. Our findings suggest that K2NaGaF6:Mn4+ can be a viable candidate for the red phosphor used in warm WLEDs.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vereshchagin S.N., Vereshchagina T.A., Solovyov L.A., Shishkina N.N., Vasilieva N.G., Anshits A.G.
Заглавие : Solid-phase transformation of Cs+- and Sr2+-bearing zeolite sorbents derived from cenospheres to mineral-like forms
Место публикации : Materials Research Society Symposium Proceedings. - 2009. - Vol. 1193: 32nd Symposium on Scientific Basis for Nuclear Waste Management (24 May 2009 through 29 May 2009, St. Petersburg, ) Conference code: 79940. - С. 87-94. - ISBN 02729172 (ISSN); 9781605111667 (ISBN)
Ключевые слова (''Своб.индексиров.''): apparent activation energy--cenospheres--crystalline minerals--crystalline phasis--crystallization temperature--higher temperatures--long-term disposal--multi phase systems--pollucites--principal components--solid-phase transformation--temperature range--thermal treatment--thermochemical transformations--transformation temperatures--xrd analysis--activation energy--atmospheric pressure--cesium--crystalline materials--crystallization--fly ash--metallic glass--radioactive waste disposal--radioactive wastes--silicate minerals--sodium--sorbents--sorption--strontium--synthesis (chemical)--waste management--atmospheric temperature
Аннотация: The paper describes the studies of the transformation of Cs+- and Sr2+-containing zeolite sorbents synthesized from fly ash cenospheres to crystalline mineral composition, suitable for the long-term disposal. Series of Cs+- and Sr2+-exchanged NaP1-containing sorbents were subjected to the thermochemical transformation in the temperature range 40-1100°C at atmospheric pressure in air and the progress of reaction was monitored by DSC and XRD analysis. It was shown that initial sodium zeolite undergoes two-step transformation at 736-785°C and 892-982°C forming nepheline as the principle product, with the conversion temperatures being dependant on the heating rate. The thermal treatment of Cs+-bearing zeolite sorbent led to formation of a complex multiphase system, the principal components of which were nepheline and pollucite. Increasing cesium content in the samples led to a monotonous shift of crystallization peak to the higher temperature range (1005-1006°C). A more complicated behavior was observed for Sr2+-containing samples, for which the crystallization temperature tends to increase (compared with NaP1) at lower Sr contents, but it starts decreasing parallel to the Sr2+ content at Sr2+ loadings 10 mg/g. The principal crystalline phases in Sr-NaP1 sample conversion were nepheline and Sr2+- containing feldspar, the quantity of which increased parallel to the increase of strontium content in zeolite. Apparent activation energies of thermochemical transformations were calculated and possible approaches to reduce transformation temperature are discussed and experimentally illustrated. © 2009 Materials Research Society.
Scopus,
eLibrary,
Источник статьи
Найти похожие

10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Krylov A. S., Kokh D., Shabanova K., Molokeev M. S., Bovina A. F., Plyaskin M., Rostovtsev N., Bezmaternykh L. N.
Заглавие : Multicomponent flux growth and composition control of Cu2MnBO5:Ga ludwigites
Место публикации : CrystEngComm. - 2022. - Vol. 24, Is. 19. - P.3565-3575. - ISSN 14668033 (ISSN), DOI 10.1039/d2ce00258b
Примечания : Cited References: 26. - This study was supported by the Russian Science Foundation (Grant No. 21-72-00130). The Raman, X-ray, and EDX data were obtained using the analytical equipment of the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: To reach the concentration phase boundary between antiferromagnetic Cu2GaBO5 and ferrimagnetic Cu2MnBO5 ludwigites, solid solutions Cu2Mn1−xGaxBO5 (x = 0.05, 0.1, 0.15, 0.175) were grown by the flux technique using a multi-component solvent based on Bi2Mo3O12 with the addition of Na2B4O7 which significantly influenced the crystal formation and cation composition of the studied compounds. The content of the flux system was corrected taking into account the earlier established relationship of the partition coefficients of Mn2O3 and Ga2O3. The influence of the solvent components on the ludwigite crystallization was analyzed. The maximum size of the grown crystal was 1 × 1 × 4 mm3. The structure and cation composition of the grown compounds were studied using X-ray (X-ray diffraction, EDX (energy-dispersive X-ray spectroscopy)) and vibrational (Raman) spectroscopy techniques. The phase boundary of Cu2MnBO5–Cu2GaBO5 was found to be in the concentration range of x = 0.15–0.175, corresponding to a change in the monoclinic axis direction and a leap in the lattice parameters. The symmetry evolution of metal–oxygen octahedra for four nonequivalent cation positions was analyzed, and the unique crystal structure of Cu2MnBO5 demonstrated high rigidity relative to the introduction of Ga3+ cations. The polarized Raman spectra of monoclinic ludwigites were obtained and studied for the first time. A comparison of the spectra of the studied samples in both phases and orthorhombic ludwigites was made. A number of spectral features due to the monoclinic distortions in the crystal were found. In agreement with the Raman experiment, the concentration phase boundary was close to 0.15.
Смотреть статью,
Scopus
Найти похожие

11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylova S. N., Xu W.-J., Rocha J., Kholkin A.
Заглавие : Structural, electronic, and optical properties of ferroelectric hybrid (Me2NH2)[NaFe(CN)5(NO)] crystal: Density functional theory simulation
Колич.характеристики :9 с
Место публикации : Mater. Today Commun. - 2024. - Vol. 40. - Ст.109623. - ISSN 23524928 (eISSN), DOI 10.1016/j.mtcomm.2024.109623
Примечания : Cited References: 50. - This work was developed within the scope of the project CICECOAveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020), UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) and LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020), financed by national funds through the FCT/MCTES (PIDDAC). W-JX, JR, and AK were supported by the Fundação para a Ciência e a Tecnologia (FCT) through the project ‘‘PhotoMultiFerro’’ (PTDC/CTM-CTM/4044). SK acknowledges the support by the state assignment of the Kirensky Institute of Physics FRC KSC SB RAS. We would like to express our gratitude to Prof. Pierre Cazade for the valuable insights and constructive discussions he has provided
Аннотация: Utilizing density functional theory (DFT), we embarked on a comprehensive investigation of the structural, electronic, and optical properties characteristic of the ferroelectric hybrid (Me2NH2)[NaFe(CN)5(NO)] crystal. The geometry of the crystal structure in the Pna21 phase was optimized. We simulated the electronic band structure within the first Brillouin zone. The calculated band gap for the indirect U-X transition is 2.401 eV, indicative of a wide band gap semiconductors. We also simulated the density of electronic states across the Brillouin zone. The simulation of the electronic structure revealed that the crystal comprises both ionic and covalent bonds. We accurately predicted various optical parameters including the dielectric function, conductivity, reflectivity, loss function, absorption, and refractive index. The reflectivity of the crystal does not exceed 21 percent. All calculated optical properties of the (Me2NH2)[NaFe(CN)5(NO)] crystal are anisotropic.
Смотреть статью
Найти похожие

12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov, Sergey, V, Krylova S. N., Borodina, Ulyana O., Krylov A. S.
Заглавие : Dynamical immiscibility of aqueous carbonate fluid in the shortite-water system at high-pressure-temperature conditions
Коллективы : RFBRRussian Foundation for Basic Research (RFBR); DFGGerman Research Foundation (DFG)European Commission [21-52-12018]; Ministry of Science and Higher EducationMinistry of Science and Higher Education, PolandEuropean Commission
Место публикации : J. Phys. Chem. C. - 2021. - Vol. 125, Is. 33. - P.18501-18509. - ISSN 1932-7447, DOI 10.1021/acs.jpcc.1c05077. - ISSN 1932-7455(eISSN)
Примечания : Cited References: 47. - The reported study was funded by the RFBR and DFG, project number 21-52-12018. Work is done on the state assignment of the Sobolev Institute of Geology and Mineralogy, Kirensky Institute of Physics SB RAS, Equipment of Federal Research Center of Krasnoyarsk Science Center SB RAS, and supported by the Ministry of Science and Higher Education. Authors thank A.N. Vtyurin, A.G. Sokol, A.Yu. Likhacheva, and A.F. Shatskiy for fruitful discussion
Предметные рубрики: SIMULTANEOUSLY HIGH-PRESSURE
SODIUM FORMATE
RAMAN-SPECTRA
Аннотация: Anhydrous carbonate shortite, Na2Ca2(CO3)3, compressed in water at high pressure–temperature (up to 5 GPa, 350 °C) was studied by Raman spectroscopy. At 3.2 GPa and 250 °C, shortite begins to dissolve, followed by crystallization of aragonite and aragonite’. The unusual behavior of aqueous carbonate fluid was observed at 4.8 GPa and 300–350 °C. This process is characterized by the active formation of microbubbles within 2–60 s that are inserted one into another. Microbubbles are considered to be a result of the two immiscible fluid stratification. This dynamical immiscibility of the fluid accompanies the appearance of several crystalline carbonates and organic molecular crystals. Na-formate and some polymorphs of Ca-formate were observed.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dzebisashvili D. M., Klyuchantsev, Andrey B.
Заглавие : London Penetration Depth as a Test of Order Parameter Symmetry in Sodium Cobaltate Superconductors
Коллективы : Russian Foundation for Basic Research (RFBR) [18-02-00837]; Presidium of the Russian Academy of Sciences [12]
Место публикации : Symmetry-Basel. - 2019. - Vol. 11, Is. 5. - Ст.633. - ISSN 2073-8994, DOI 10.3390/sym11050633
Примечания : Cited References: 43. - The work was financially supported by the Russian Foundation for Basic Research (RFBR) (project no. 18-02-00837) and by the program of the Presidium of the Russian Academy of Sciences No. 12 "Fundamental problems of high-temperature superconductivity".
Предметные рубрики: SPIN
DEPENDENCE
POWDER
CHARGE
PHASE
GAP
Аннотация: Temperature dependence of the magnetic field penetration depth λ was calculated for water intercalated sodium cobaltate superconductor NaxCoO2⋅yH2O. Assuming that the system is in the chiral d+id–wave superconducting state, it was shown that the shifting of the excitation spectrum nodal points off the normal phase Fermi surface due to variation of the sodium content x changes the functional form of the temperature dependence of λ−2 from exponential to linear in the low temperatures region. It is argued that this change in the functional form of T–dependence of the λ−2 can serve as a proof for the chiral symmetry of the superconducting order parameter in the sodium cobaltate.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokina T. V., Petrakovskii G. A., Bayukov O. A., Molokeev M. S., Vorotynov A. M., Popkov S. I., Velikanov D. A.
Заглавие : Physical properties of a frustrated uasi-one-dimensional NaCuFe2(VO4)3 magnet and effect of chemical pressure induced by the substitution of sodium for lithium
Место публикации : Phys. Solid State. - 2020. - Vol. 62, Is. 2. - P.297-307. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783420020122
Примечания : Cited References: 22
Аннотация: The structural, thermal, static magnetic, and resonance properties of the low-dimensional NaCuFe2(VO4)3 compound obtained by the solid-phase synthesis have been investigated. In the temperature range of 110–300 K, the electron spin resonance in the X band with a g factor of 2.008 has been detected. The magnetic properties of a sample with a high frustration level in the paramagnetic, antiferromagnetic, and disordered states have been examined. A shift of the Neel temperature to the high-temperature region in an external magnetic field has been observed. The origin of the disordered magnetism in NaCuFe2(VO4)3 are discussed. The features of substitution of sodium for lithium on the physical properties of the ACuFe2(VO4)3 (A = Na, Li) system have been established. It is shown that the chemical pressure changes the crystal lattice parameters, spacings between magnetic ions, and crystallite size, which is reflected in the physical properties of the material.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Huang J., Su B., Song E., Molokeev M. S., Xia Z.
Заглавие : Ultra-broad-band-excitable Cu(I)-based organometallic halide with near-unity emission for light-emitting diode applications
Место публикации : Chem. Mater. - 2021. - Vol. 33, Is. 12. - P.4382-4389. - ISSN 08974756 (ISSN), DOI 10.1021/acs.chemmater.1c00085
Примечания : Cited References: 43. - This research was supported by the National Natural Science Foundation of China (Grant Nos. 51961145101 and 51972118), the Fundamental Research Funds for the Central Universities (D2190980), the Guangzhou Science and Technology Project (202007020005), International Cooperation Project of National Key Research and Development Program of China (2021YFE0105700), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). The reported study was also funded by RFBR according to research project no. 19-52-80003
Аннотация: Low-dimensional hybrid metal halides demonstrate broad-band emission and high photoluminescence quantum yield (PLQY) acting as excellent candidates for a new generation of luminescent materials in lighting fields. However, most luminescent metal halides can only be excited by ultraviolet radiation, and the discovery of high-efficient emitters with broad-band excitation characteristics, especially upon efficient blue light irradiation, is a challenge. Herein, a zero-dimensional (0D) Cu(I)-based organometallic halide (18-crown-6)2Na2(H2O)3Cu4I6 (CNCI) was prepared with a green emission band centered at 536 nm and a near-unity PLQY (91.8%) upon excitation of 450 nm. Importantly, the ultrabroad excitation band covering a 300-500 nm range was observed in CNCI, and the luminescence mechanism has been discussed in detail. A white light-emitting diode (WLED) was fabricated with high luminous efficiency of 156 lm/W and a high color rendering index of 89.6. This work provides guidance for designing high-performance luminescent metal halides with suitable excitation characteristics and also promotes the application prospects of such materials in WLED fields.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedotov A. P., Shabanov V. F.
Заглавие : Deuteron dynamics in crystal of sodium trideuterium selenite
Место публикации : Phys. Status Solidi B. - 1983. - Vol. 118, Is. 1. - P.345-351. - ISSN 0370-1972, DOI 10.1002/pssb.2221180140
Примечания : Cited References: 16
WOS
Найти похожие

17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasiliev A. D., Laptash N. M.
Заглавие : Polymorphism of KNaNbOF5 crystals
Место публикации : J. Struct. Chem.: Springer, 2012. - Vol. 53, Is. 5. - P.902-906. - ISSN 0022-4766, DOI 10.1134/S0022476612050101
Примечания : Cited References: 11. - The work was supported by RFBR (grant No. 09-02-00062).
Предметные рубрики: OXIDE FLUORIDE ANIONS
Ключевые слова (''Своб.индексиров.''): potassium-sodium oxopentafluoroniobate--crystal structure--o/f order--concomitant polymorphism
Аннотация: X-ray crystallography is used to analyze the concomitant polymorphism of KNaNbOF5 crystals. The second beta-modification of the compound, crystallizing in the tetragonal crystal system is found for the first time: space group P4/nmm, a = 5.9352(2) , c =8.5487(5) , V = 301.14(2) (3), Z = 2, R1 = 0.0095. Parameters of the orthorhombic noncentrosymmetric structure of the alpha-phase, previously described by Poeppelmeier et al. (J. Am. Chem. Soc., 129, 13963-13969 (2007)), are refined and a comparative analysis of both structures is performed. The structures are characterized by the complete ordering of oxygen and fluorine atoms, the Nb-O distance in the alpha-phase (1.738(1) ) being noticeably longer than that in the beta-phase (1.709(2) ). In beta-KNaNbOF5, alternating NbOF5 and NaOF5 octahedra share vertices, while in alpha-KNaNbOF5, they share both vertices and edges. The existence of the non-polar centrosymmetric beta-modification of KNaNbOF5 cancels the assumption of the substantial contribution of potassium cations to the polar structure of alpha-KNaNbOF5.
Смотреть статью,
Scopus,
WoS,
Читать в сети ИФ
Найти похожие

18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Bondarev V. S., Raevskaya S. I., Ivliev M. P., Raevskii I. P., Flerov I. N.
Заглавие : Studies of the heat capacity and thermal expansion of the Na0.95K0.05NbO3 solid solution
Коллективы : Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation [NSh-4828.2012.2]; Russian Foundation for Basic Research [12-02-31799 mol_a]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 56, Is. 2. - P.367-372. - ISSN 1063-7834, DOI 10.1134/S1063783414020115. - ISSN 1090-6460
Примечания : Cited References: 27. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4828.2012.2) and the Russian Foundation for Basic Research (project no. 12-02-31799 mol_a).
Предметные рубрики: SODIUM NIOBATE
PHASE-TRANSITIONS
TEMPERATURE-RANGE
SINGLE-CRYSTALS
KNBO3
FERROELECTRICS
DIFFRACTION
OCTAHEDRA
Аннотация: The heat capacity and thermal expansion of ceramic samples of the Na0.95K0.05NbO3 solid solution have been investigated over a wide temperature range of 100-750 K. The observed anomalies in the heat capacity and thermal expansion at T (4) = 297 K, T (3) = 535 K, T (2) = 665 K, and T (1) a parts per thousand 710 K correspond to the sequences of phase transitions N - Q - G - S - T1. It has been shown that, as a result of the phase transitions, the unit cell volume at T (4) and T (2) decreases, and at T (3) and T (1), increases with increasing temperature. The directions of the shift of the phase transition temperatures induced by hydrostatic pressure have been determined. It has been established that all structural transformations are accompanied by relatively small variations in the entropy. Different mechanisms of the structural distortions have been discussed.
Смотреть статью,
Scopus,
WoS,
Читать в сети ИФ
Найти похожие

19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yaroslavtsev R. N., Chekanova L. A., Komogortsev S. V., Iskhakov R. S.
Заглавие : Effect of sodium hypophosphite content to the deposition rate, structure and magnetic properties of electroless deposited Ni-P alloy
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: S. G. Ovchinnikov, A. Samardak: Trans Tech Publications, 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P.237-241. - ISSN 978-303835054-5, DOI 10.4028/www.scientific.net/SSP.215.237. - ISSN 1662-9779
Примечания : Cited References: 15
Ключевые слова (''Своб.индексиров.''): electroless coatings--nickel-phosphorus alloy
Аннотация: The deposition kinetics, structure and magnetic properties of electroless deposited films Ni-P were investigated depending on the amount of sodium hypophosphite in the electroless bath. It was found that the film deposition rate is linear and unambiguously varies with the hypophosphite content from 2 to 13 g/l and from 23 to 25 g/l. The deposition rate varies widely in the hypophosphite concentration range from 13 to 23 g/l. The films are composed of amorphous Ni-P phase and fcc Ni-P solid solution with phosphorus content from 1 to 4 at.% P according to X-ray diffraction. The partial amount of amorphous phase is increased with concentration of sodium hypophosphite. The ferromagnetic resonance field is independent on the concentration of sodium hypophosphite, which assumes to be result from the laminated allocation of the amorphous and fcc phases in the film. © (2014) Trans Tech Publications, Switzerland.
Читать в сети ИФ
Найти похожие

20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov E. A., Kotlyarskii M. M., Edelman I. S.
Заглавие : Temperature and field dependence of exciton-magnon absorption of NaMnCl//3.
Место публикации : Physica Status Solidi B - Basic Research. - 1985. - Vol. 132, Is. 2. - P.465-470. - ISSN 0370-1972
Ключевые слова (''Своб.индексиров.''): band structure--light - absorption--sodium compounds - optical properties--exciton-magnon absorption--sodium manganese chloride--magnetic materials
Аннотация: The behaviour of the optical absorption bands of NaMnCl//3 is experimentally studied in the region of the **6A//1//g to **4A//1//g, **4E//g(**4G) transition of the Mn**2** plus ion in the temperature range 1. 8 to 20 K and in magnetic fields up to 20 T. Exciton and its 'hot' magnon sidebands are observed in the spectrum. The anomalous temperature dependence of the exciton-magnon bands intensity is explained by participation of magnons with wave vector K does not equal 0 in absorption. The low energy exciton-magnon band is supposed to be due to simultaneous creation of an exciton and annihilation of three thermally created magnons.
Scopus
Найти похожие