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1.
Features of electronic
paramagnetic resonance in the ErAl3(BO3)4 single crystal / V. A. Bedarev [et al.]> // Low Temp. Phys. - 2018. -
Vol. 44
,
Is. 8
. - P. 863-865,
DOI
10.1063/1.5049175. - Cited References: 12 . - ISSN 1063-777X. - ISSN 1090-6517
РУБ
Physics, Applied
Рубрики:
PHASES
Аннотация:
An additional resonance line was found in the EPR spectrum of the ErAl3(BO3)4 crystal at a temperature of 4.2 K, along with the main line. The appearance of an additional line is associated with the possible formation of magnetic clusters in the crystal.
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Публикация на русском языке
Особенности электронного парамагнитного резонанса в монокристалле ERAL3(BO3)4 [Текст] / В. А. Бедарев [и др.] // Физика низк. темп. - 2018. - Т. 44 № 8. - С. 1104-1107
Держатели документа:
Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, 47 Nauky Ave, UA-61103 Kharkov, Ukraine.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Доп.точки доступа:
Bedarev, V. A.; Merenkov, D. N.; Kobets, M. I.; Poperezhaj, S. N.; Gnatchenko, S. L.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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2.
H-2 NMR investigation
of the transition to the proton glass state in the CS5H3(SO4)(4)center dot 0.5H(2)O crystal / Y. N. Ivanov [et al.]> // Phys. Solid State. - 2007. -
Vol. 49
,
Is. 6
. - P. 1142-1148,
DOI
10.1134/S1063783407060200. - Cited References: 19 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
DIELECTRIC-RELAXATION
MAGNETIC-RESONANCE
PHASES
Аннотация:
A crystal of the CS5H3(SO4)(4) (.) xH(2)O (x approximate to 0.5) (PCHS) compound, which belongs to the family of proton conductors with a complex system of hydrogen bonds, is investigated by H-2 NMR spectroscopy. The temperature and orientation dependences of the H-2 NMR spectra are measured and analyzed. It is established that, upon transition to the glassy phase at the temperature T-g = 260 K, the parameters characterizing the proton exchange between positions in hydrogen bonds remain unchanged to within the limits of experimental error. The protons in the two-dimensional network of hydrogen bonds in the (001) plane are dynamically disordered over possible positions down to temperatures considerably lower than the glass transition point T-g. However, water molecules are fixed at particular structural positions in the phase transition range. In PCHS crystals with a nonstoichiometric water content, this circumstance can be responsible for the frustration that leads to the formation of the glassy state.
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Держатели документа:
LV Kirenskii Inst Phys, Russian Acad Sci, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Shubnikov Inst Crystallog, Moscow 119333, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow 119333, Russian Federation
Доп.точки доступа:
Ivanov, Y. N.; Иванов, Юрий Николаевич; Aleksandrova, I. P.; Александрова, Инга Петровна; Sukhovsky, A. A.; Суховский, Андрей Андреевич; Baranov, A. I.
}
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3.
High-frequency dielectric spectra
from liquid crystals of series nCB and nOCB / B. A. Belyaev [et al.]> // Tech. Phys. - 2002. -
Vol. 47
,
Is. 4
. - P. 470-473,
DOI
10.1134/1.1470597. - Cited References: 8 . - ISSN 1063-7842
РУБ
Physics, Applied
Рубрики:
DECIMETER WAVELENGTH RANGE
RELAXATION
SPECTROSCOPY
PHASES
Аннотация:
The design of a resonant frequency-tunable high-sensitivity microstrip sensor is suggested. The permittivity dispersion of liquid crystals of two homologic series, alkylcyanobiphenyls (7CB and 8CB) and alkyloxycyanobiphenyls (7OCB and 8OCB), is studied at frequencies of 100-900 MHz. The dielectric spectra are shown to be the sum of the Debye relaxation and dielectric resonances observed at f approximate to 160, 280, 360, 450, 550, and 650 MHz. The dielectric resonances are present in the spectra of all the samples in both the nematic and isotropic phase. The substitution of an oxygen atom (series nOCB) for a carbon atom (series nCB) in liquid crystal molecules has a minor effect on the dielectric resonance frequencies but changes the resonance intensities and splits some of the resonance lines. (C) 2002 MAIK "Nauka / Interperiodica".
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Drokin, N. A.; Дрокин, Николай Александрович; Shabanov, V. F.; Шабанов, Василий Филиппович; Shepov, V. N.; Шепов, Владимир Николаевич
}
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4.
Aver'yanov, E. M.
Manifestations of the higher moments of the orientation distribution function of molecules in the spectral properties of an impurity nematic / E. M. Aver'yanov, V. G. Rumyantsev> // J. Exp. Theor. Phys. - 2004. -
Vol. 98
,
Is. 6
. - P. 1146-1151,
DOI
10.1134/1.1777627. - Cited References: 15 . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
LIQUID-CRYSTAL
SCATTERING
PHASES
MATRIX
ORDER
DYES
Кл.слова (ненормированные):
Absorption
--
Band structure
--
Impurities
--
Molecular dynamics
--
Polarization
--
Spectrum analysis
--
Distribution function
--
Local field parameters
--
Splitting
--
Temperature dependence
--
Nematic liquid crystals
Аннотация:
The polarized electronic absorption spectra, orientation ordering, and the special local field features were studied for push-pull linear dye molecules with strong donor-acceptor electronic conjugation of terminal fragments in the matrix of a nematic liquid crystal. The temperature-induced inversion of the sign of the splitting of polarized impurity absorption bands was observed. This effect was shown to be caused by the statistical character of orientation ordering of impurity molecules and manifestation of the higher moments of the orientation distribution function. The dependence of local field parameters (Lorentz tensor components) of impurity molecules on their orientation ordering was established. This dependence was used to reproduce the temperature dependence of the orientation order parameter of the matrix. (C) 2004 MAIK "Nauka / Interperiodica".
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Res Inst Organ Intermediates & Dyes, Dolgoprudnyi 141700, Moscow Oblast, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Research Institute of Organic Intermediates and Dyes, Dolgoprudnyi, Moscow oblast, 141700, Russian Federation
Доп.точки доступа:
Rumyantsev, V. G.; Аверьянов, Евгений Михайлович
}
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5.
Methane oxidation over
A-site ordered and disordered Sr0.8Gd0.2CoO3−δ perovskites / S. N. Vereshchagin [et al.]> // Chem. Commun. - 2014. -
Vol. 50
,
Is. 46
. - P. 6112-6115,
DOI
10.1039/c4cc00913d. - Cited References: 20. - The authors acknowledge the financial support from SB RAS project N 38 (2012) and RFBR grant 13-02-00358. . - ISSN 1359-7345. - ISSN 1364-548X
РУБ
Chemistry, Multidisciplinary
Рубрики:
MEMBRANE REACTORS
OXYGEN
OXIDES
PERFORMANCE
COMBUSTION
FEATURES
PHASES
Аннотация:
A tetragonal phase Sr0.8Gd0.2CoO3−δ with ordered Gd3+/Sr2+ ions and oxygen vacancy sites is found to be about five times less active in the reaction of methane combustion than a quenched cubic perovskite phase with randomly distributed (disordered) Gd3+/Sr2+ ions over the A-sites of the crystal lattice.
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Держатели документа:
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660036, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Доп.точки доступа:
Vereshchagin, S. N.; Solovyov, L. A.; Соловьев, Леонид Александрович; Rabchevskii, E. V.; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Anshits, A. G.; Аншиц, Александр Георгиевич; SB RAS project [38]; RFBR [13-02-00358]
}
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6.
New bismuth borophosphate
Bi4BPO10: Synthesis, crystal structure, optical and band structure analysis / N. A. Babitsky [et al.]> // Mater. Chem. Phys. - 2015. -
Vol. 163
. - P. 286-292,
DOI
10.1016/j.matchemphys.2015.07.042. - Cited References: 32. - The study was performed with the financial support of the Ministry of Science and Education of the Russian Federation, Projects 3049, 3098, item 1025, "Fund for Assistance to Small Innovative Enterprises in Science and Technology" (Grant program "UMNIK" 2013 II half GU1/2014), ICDD Grant-in-Aid, #93-10 . - ISSN 0254-0584
РУБ
Materials Science, Multidisciplinary
Рубрики:
INITIO MOLECULAR-DYNAMICS
AUGMENTED-WAVE METHOD
POWDER DATA
SYSTEM
PHASES
Кл.слова (ненормированные):
Inorganic compounds
--
Crystal growth
--
Crystal structure
--
Band-structure
Аннотация:
New bismuth borophosphate Bi4BPO10 was obtained by spontaneous crystallization from the melt of correspondent composition at 804 °C. Crystal structure with orthorhombic lattice parameters: a = 22.5731(3) Å, b = 14.0523(2) Å, c = 5.5149(1) Å, V = 1749.34(4), Z = 8, SG Pcab was determined by X-ray powder diffraction technique. The [Bi2O2]2+ -layers, which are typical for bismuth oxide compounds, transform into cationic endless strips of 4 bismuth atoms width directed along the c-axis in Bi4BPO10. The strips combining stacks are separated by flat triangle [BO3]3- -anions within stacks. Neighboring stacks are separated by tetrahedral [PO4]3--anions and shifted relatively to each other. Bismuth atoms are placed in 5-7 vertex oxygen irregular polyhedra. Bi4BPO10 is stable up to 812 °C, then melts according to the peritectic law. The absorption spectrum in the range 350-700 nm was obtained and the width of the forbidden band was estimated as 3.46 eV. The band electronic structure of Bi4BPO10 was modeled using DFT approach. The calculated band gap (3.56 eV) is in good agreement with the experimentally obtained data. © 2015 Elsevier B.V. All rights reserved.
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Держатели документа:
Siberian Federal University, 79 Svobodny Av, Krasnoyarsk, Russian Federation
Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Babitsky, N. A.; Leshok, D. Y.; Mikhaleva, N. S.; Kuzubov, A. A.; Кузубов, Александр Александрович; Zhereb, V. P.; Kirik, S. D.
}
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7.
New hexagonal perovskite
with Mn4+ and Mn5+ at distinct structural positions / N. V. Tarakina [et al.]> //
J. Phys.: Conf. Ser. - 2015. -
Vol. 644
. - Ст. UNSP 012004,
DOI
10.1088/1742-6596/644/1/012004. - Cited References:13 . - ISSN 1742-6588
Рубрики:
MAGNETIC-PROPERTIES
OXIDES
PHASES
Аннотация:
A new hexagonal perovskite, Ba7Li1.75Mn3.5O15.75, has been synthesised using microwave-assisted solid-state synthesis. Its crystal structure has elements typical for the layered hexagonal perovskites and quasi-one-dimensional oxides, hence representing a new polytype. Structural solution based on simultaneous refinement of X-ray and neutron diffraction data shows that Ba7Li1.75Mn3.5O15.75 crystallizes in a hexagonal unit cell with parameters a = 5.66274(2) Å and c = 16.7467(1) Å ( V = 465.063(4) Å3). Columns of face- shared octahedra occupied by Mn4+, Li+ cations and vacancies along the c axis are separated in the ab plane by barium atoms, so that every sixth layer, the coordination of Mn5+ and Li+ changes to tetrahedral. Separation of Mn4+ and Mn5+ cations in two distinct structural positions makes the structure unique. A scanning transmission electron microscopy study revealed the formation of a rhombohedrally centered supercell, which might be attributed to the ordering of manganese and lithium atoms among cationic sites.
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Доп.точки доступа:
Tarakina, N. V.; Tyutyunnik, A. P.; Bazuev, G. V.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Berger, I. F.; Gould, C.; Nikolaenko, I. V.; Electron Microscopy and Analysis Group Conference(2015 ; Jun 02-Jul 02 ; Manchester, England)
}
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8.
New method for
regulating the activity of ABO3 perovskite catalysts / S. N. Vereshchagin [et al.]> // Kinet. Catal. - 2015. -
Vol. 56
,
Is. 5
. - P. 640-645,
DOI
10.1134/S0023158415040199. - Cited References:23. - This work was supported in part by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (grant no. NSh-2886.2014.2). . - ISSN 0023. - ISSN 1608-3210. -
РУБ
Chemistry, Physical
Рубрики:
MEMBRANE REACTORS
METHANE COMBUSTION
OXIDATION
OXIDES
OXYGEN
PERFORMANCE
FEATURES
PHASES
CO
Кл.слова (ненормированные):
perovskite
--
cobalt
--
methane
--
deep oxidation
--
oxidative condensation
Аннотация:
A new possibility of changing the activity and selectivity of perovskite catalysts in the oxidative conversion of methane was demonstrated using the Sr x Gd1–x CoO3–δ (0.5 < x < 0.9) compounds as an example. It was established that, at the same chemical composition, the disordering of Sr2+/Gd3+ ions over the A positions of the crystal structure led to a significant increase in activity in the deep oxidation reaction of CH4, as compared with the samples with an ordered distribution of cations.
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Публикация на русском языке
Новый способ регулирования активности катализаторов АВО3 со структурой перовскита [Текст] / С. Н. Верещагин [и др.] // Кинетика и катализ. - М. : Наука, 2015. - Т. 56 № 5. - С. 649-664
Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.
Доп.точки доступа:
Vereshchagin, S. N.; Solov'ev, L. A.; Соловьев, Леонид Александрович; Rabchevskii, E. V.; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Anshits, A. G.; Аншиц, Александр Георгиевич; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [NSh-2886.2014.2]
}
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9.
ORBITAL POLARIZATION IN
METALLIC F-ELECTRON SYSTEMS / I. S. SANDALOV [et al.]> // Phys. Rev. B. - 1995. -
Vol. 51
,
Is. 20
. - P. 13987-14000,
DOI
10.1103/PhysRevB.51.13987. - Cited References: 28 . - ISSN 0163-1829
РУБ
Physics, Condensed Matter
Рубрики:
MOTT INSULATORS
VOLUME COLLAPSE
CERIUM
LOCALIZATION
TRANSITION
PHASES
MODEL
WOS
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Scopus
Держатели документа:
RUSSIAN ACAD SCI,KIRENSKY INST PHYS,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН
Condensed Matter Theory Group, Institute of Physics, University of Uppsala, Uppsala, Sweden
Kirensky Institute of Physics, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Доп.точки доступа:
SANDALOV, I. S.; Сандалов, Игорь Семёнович; HJORTSTAM, O.; JOHANSSON, B.; ERIKSSON, O.
}
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10.
Synthesis and crystal
structure of a new hexagonal perovskite 7H-Ba7Li1.75Mn3.5O15.75 with Mn4+/Mn5+ charge distribution / N. V. Tarakina [et al.]> // Dalton Trans. - 2015. -
Vol. 44
,
Is. 42
. - P. 18527-18535,
DOI
10.1039/c5dt01528f. - Cited References: 40. - The authors regret a spelling mistake in the surname of one of authors. The surname given as ‘Vasilev’ should be ‘Vasiliev’. - N.V.T. acknowledges funding by the Bavarian Ministry of Sciences, Research and the Arts. X-ray powder diffraction studies were carried out at the Center for collective use "X-ray structure analysis" at the Institute of Solid State Chemistry, Ural Branch of RAS (Ekaterinburg, Russia) . - ISSN 1477-9226
Перевод заглавия:
Синтез и кристаллическая структура нового гексагонального перовскита 7H-Ba7Li1.75Mn3.5O15.75 с зарядовым распределением Mn4+/Mn5+
РУБ
Chemistry, Inorganic & Nuclear
Рубрики:
Magnetic-properties
Chemistry
Phases
Аннотация:
Ba7Li1.75Mn3.5O15.75 is a new hexagonal perovskite whose crystal structure has elements typical for the layered hexagonal perovskites and quasi-one-dimensional oxides, hence representing a new polytype. It has been synthesized via a solid-state microwave route. The crystal structure was solved using a combination of X-ray and neutron diffraction data, which show that Ba7Li1.75Mn3.5O15.75 crystallizes in a hexagonal unit cell with parameters a = 5.66274(2) A and c = 16.7467(1) A (V = 465.063(4) A3), with one formula unit, and can be described as columns of face-shared octahedra occupied by Mn4+ and Li+ cations and vacancies along the c axis separated in the ab plane by barium atoms. Every sixth layer, the coordination of Mn5+ and Li+ changes to tetrahedral. Additional local ordering of manganese and lithium atoms among cationic sites leading to the formation of a rhombohedral supercell has been observed by scanning transmission electron microscopy.
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Держатели документа:
The NanoVision Centre, School of Engineering and Materials Science, Queen Mary University of London Mile End, London, United Kingdom
Experimentelle Physik III, Physikalisches Institut and Wilhelm Conrad, Rontgen-Research Centre for Complex Material Systems, Universitat Wurzburg Am Hubland, Wurzburg, Germany
Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, 91 Pervomayskaya, Ekaterinburg, Russian Federation
L.V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, 50 Akademgorodok, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Tarakina, N. V.; Tyutyunnik, A. P.; Bazuev, G. V.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Gould, C.; Nikolaenko, I. V.; Berger, I. F.
}
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