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Acoustooptic and elastic properties of NaBi(WO4)2 and LiBi(MoO4)2crystals / K. S. Aleksandrov [et al.] // Russ. Ultrason. - 1988. - Vol. 18, Is. 3. - P. 168-171 . - ISSN 0048-8828
Кл.слова (ненормированные):
Acoustooptical Devices--Materials -- Elasticity -- Lithium Compounds -- Sodium Compounds -- Acoustooptic Properties -- Bulk Acoustic Waves -- Elastic Properties -- Crystals
Аннотация: In recent years interest has been shown in crystals with the scheelite structure (point symmetry group 4/m) as promising materials for acoustooptic devices. However, nearly all the work done so far has been on the NaBi(MoO4)2 and PbMoO4 crystals. In this paper the authors give the results of a study of the elastic and acoustooptic properties of NaBi(WO4)2 and LiBi(MoO4)2 crystals from a series of isomorphic compounds with the scheelite structure carried out in order to determine the extent of the changes in the elastic and acoustooptic properties of this series of crystals when the structural elements are changed.

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Держатели документа:
USSR Acad of Sciences, Russian Federation

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Burkov, S. I.; Samkov, A. V.; Kholov, A.; Khafizov, S.Kh.; Shabanova, L. A.; Klevtsov, P. V.; Красноярский государственный университет
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Fedorov, A. S.
Analysis of hydrogen adsorption in the bulk and on the surface of magnesium nanoparticles / A. S. Fedorov, M. V. Serzhantova, A. A. Kuzubov // J. Exp. Theor. Phys. - 2008. - Vol. 107, Is. 1. - P. 126-132, DOI 10.1134/S1063776108070121. - Cited References: 15. - This study was supported financially by the Russian Foundation for Basic Research ( project no. 06-02-16132). The authors are also grateful to the Institute of Computer Modeling of the Siberian Branch of the Russian Academy of Science for providing a cluster computer on which all quantum-chemistry calculations were performed. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
MOLECULAR-DYNAMICS
TRANSITION
METALS
Кл.слова (ненормированные):
Adsorption -- Gas adsorption -- Hydrogen -- Light metals -- Magnesium -- Nonmetals -- Hydrogen adsorption -- Magnesium hydrides -- Magnesium printing plates
Аннотация: The stability of magnesium hydride (MgH (x) ) nanoparticles (x = 0.5,...,2) is investigated using ab initio calculations. It is shown that for a nanoparticle diameter of D similar to 5 nm, the internal pressure becomes lower than 3 kbar; for this reason, the structure of hydride nanoparticles coincides with the structure of this hydride in crystalline form. It is found that the phase of partly saturated MgH (x) hydrides (x < 2) must decompose into the phase of pure hcp magnesium and the alpha phase of MgH(2). The frequencies of jumps of hydrogen atoms within the hcp phase of magnesium and in the alpha phase of MgH(2) are calculated; it is shown that slow diffusion of hydrogen in magnesium is due to the large height of potential barriers for motion of hydrogen within MgH(2). To attain high diffusion rates, the structures of Mg(53)Sc and Mg(53)Ti crystals and their hydrides are calculated. It is found that the frequency of jumps of H atoms in Mg(53)ScH(108) near the Sc atoms does not noticeably change as compared to the frequency of jumps in the alpha phase of MgH(2), while the frequency of jumps in Mg(53)TiH(108) near Ti atoms is higher by approximately a factor of 2.5 x 10(6). This means that diffusion in manganese hydride with small admixtures of titanium atoms must be considerably eased. Chemical dissociation of hydrogen molecules on the (0001) surface of hcp magnesium, on the given surface with adjoined individual Ti atoms, and on the surface of a one-layer titanium cluster on the given surface of magnesium is investigated. It is found that dissociation of hydrogen at solitary titanium atoms, as well as on the surface of a Ti cluster, is facilitated to a considerable extent as compared to pure magnesium. This should also sharply increase the hydrogen adsorption rate in magnesium nanoparticles.

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Держатели документа:
[Fedorov, A. S.
Kuzubov, A. A.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Serzhantova, M. V.
Kuzubov, A. A.] Siberian Fed Univ, Krasnoyarsk 660028, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Akademgorodok, Krasnoyarsk, 660028, Russian Federation

Доп.точки доступа:
Serzhantova, M. V.; Kuzubov, A. A.; Кузубов, Александр Александрович; Федоров, Александр Семенович
}
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Aplesnin, S. S.
Anomalies in magnetoresistance and in the bulk modulus for ferromagnetics with four-spin exchange interaction on the Kondo lattice / S. S. Aplesnin, N. I. Piskunova // J. Phys.: Condens. Matter. - 2006. - Vol. 18, Is. 29. - P. 6859-6868, DOI 10.1088/0953-8984/18/29/023. - Cited References: 29 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
MIXED-VALENCE MANGANITES
   PHASE-SEPARATION
   LA1-XSRXMNO3
   BEHAVIOR
   PECULIARITIES
   TRANSITION
Кл.слова (ненормированные):
Elastic moduli -- Electric resistance -- Ferromagnetism -- Function evaluation -- Paramagnetism -- Transceivers -- Adiabatic approximation -- Kondo lattice -- Paramagnetic state -- Ring exchange -- Magnetoresistance
Аннотация: The temperature dependence of resistivity and the bulk modulus are calculated on the Kondo lattice, with ring exchange between localized spins, using the spin-polaron and adiabatic approximation. Peak and zero values of the bulk modulus as functions of temperature and concentration are determined below the temperature of the transition to the paramagnetic state. The effects of the nearest order between transverse spin components and a value of the ring exchange between localized spins on magnetoresistivity are estimated.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
MF Reshetneva Aircosm Siberian State Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
L v Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
M F Reshetneva Aircosmic Siberian State University, Krasnoyarsk, 660014, Russian Federation

Доп.точки доступа:
Piskunova, N. I.; Аплеснин, Сергей Степанович
}
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Bulk acoustic waves propagation in Li2B4O7 piezoelectric crystals under the static uniaxial mechanical pressure / K. S. Aleksandrov [et al.] // Proceedings of the Annual IEEE International Frequency Control Symposium / Annual frequency control symposium (54 ; 2000 ; Jun. ; 7-9 ; Kansas, MO). - 2000. - P. 214-217. - Cited References: 8 . - ISBN 01616404
Кл.слова (ненормированные):
Acoustic wave transmission -- Acoustic wave velocity -- Elasticity -- Lithium compounds -- Mathematical models -- Permittivity -- Piezoelectricity -- Pressure effects -- Single crystals -- Electromechanical constants -- Piezoelectric crystal -- Piezoelectric materials
Аннотация: The influence of uniaxial mechanical stresses on bulk acoustic waves velocity in piezoelectric crystals Li2B4O7 has been investigated. Electromechanical constants have determined.

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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Turchin, P. P.; Sorokin, B. P.; Karpovich, A. A.; Nefedov, V. A.; Annual frequency control symposium(54 ; 2000 ; Jun. ; 7-9 ; Kansas, MO)
}
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    Bulk CoNiFe-SiB amorphous and nanostructured alloys produced by plasma spray deposition and dynamic compaction: formation of soft magnetic properties / E. A. Denisova // Phys. Procedia. - 2015. - Vol. 75. - P. 1238-1243, DOI 10.1016/j.phpro.2015.12.136. - Cited References: 9. - This work was supported by Russian Foundation of Basic Research 15-08-06673 and RFBR-KRFS 15-42-04171 . - ISSN 1875-3892
   Перевод заглавия: CoNiFe-SiB, полученные методами плазменного напыления и динамического компактирования: формирование магнитомягких свойств
Кл.слова (ненормированные):
bulk nanostructured materials -- dynamic compaction -- plasma spray deposition -- magnetic properties
Аннотация: The bulk nanostructured Co58Ni10Fe5B16Si11 alloys were prepared by dynamic compaction and plasma spray deposition techniques. The investigation of structure and magnetic properties of bulk samples was carried out by X-ray diffraction, electron microscopy and correlation magnetometry. The bulk samples produced by both methods can be characterized as a heterophase system. The highest value of permeability 20 · 103 for plasma spraying coating is achieved when volume fraction of nanocrystalline phase with Curie temperature Tc ∼ 640 K is increased to 30%. The magnetic characteristics, such as the saturation magnetization, the Bloch constant, the local magnetic anisotropy field, the ferromagnetic resonance linewidth, and the coercivity remain unchanged after both compaction techniques. It was shown that the plasma spraying method allows to obtain bulk magnetically soft materials with magnetic parameters that are not inferior to the characteristics of a thermally treated rapidly quenched ribbon with the same composition.

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Доп.точки доступа:
Denisova, E. A.; Денисова, Елена Александровна; Kuzovnikova, L. A.; Кузовникова, Людмила Александровна; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Kuzovnikov, A.; Lepeshev, A. A.; Nemtsev, I. V.; Немцев, Иван Васильевич; Saunin, V. N.; Telegin, S. V.; Bondarenko, G. N.; Mal'tsev, V. K.; Мальцев, Вадим Константинович; International Conference on Magnetism(20 ; 2015 ; Jul ; 5-10 ; Barselona, Spain)
}
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    Bulk CoNiFe-SiB amorphous and nanostructured alloys produced by plasma spray deposition and dynamic compaction: formation of soft magnetic properties / E. A. Denisova [et al.] // 20th Int. Conf. on Magnetism (ICM-2015) : book of abstracts. - 2015. - Ст. TU.H-P55
   Перевод заглавия: Объемные аморфные и наноструктурированные сплавы CoNiFe-SiB, полученные плазменным напылением и динамическим компактированием: формирование магнитомягких свойств.

Материалы конференции

Доп.точки доступа:
Denisova, E. A.; Денисова, Елена Александровна; Kuzovnikova, L. A.; Кузовникова, Людмила Александровна; Kuzovnikov, A. A.; Кузовников А. А.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Lepeshev, A. A.; Лепешев, Анатолий Александрович; Nemtsev, I. V.; Немцев, Иван Васильевич; Saunin, V. N.; Telegin, S. V.; International Conference on Magnetism(20 ; 2015 ; Jul ; 5-10 ; Barselona, Spain)
}
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Bulk nanostructured materials produced by dynamic compaction of composite Co-P/Cu and Al2O3/Co-P core-shell particles / L. A. Kuzovnikova [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P10.19. - P. 487. - This work was supported by Russian Foundation of Basic Research 15-08-06673, 16-03-00256, 16-03-00969 and RFBR-KRFS 15-42-04171 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
dynamic compaction -- nanostructured materials -- magnetic properties

Доп.точки доступа:
Kuzovnikova, L. A.; Denisova, E. A.; Денисова, Елена Александровна; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Kuzovnikov, A. A.; Nemtsev, I. V.; Немцев, Иван Васильевич; Mal'tsev, V. K.; Мальцев, Вадим Константинович; Институт физики им. Л.В. Киренского Сибирского отделения РАН

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Mankov, Yu. I.
Bulk plasma waves in a randomly inhomogeneous conductor / Yu. I. Mankov // Phys. Solid State. - 2012. - Vol. 54, Is. 7. - P. 1323-1331, DOI 10.1134/S1063783412070268. - Cited References: 27 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
VOLUME PLASMONS
   DISPERSION
   PLASMAVERLUSTES
   SURFACE
Аннотация: The modification of the spectrum and damping of bulk plasma waves due to three-dimensional random inhomogeneities of the density of a degenerate electron gas in a conductor have been investigated using the averaged Green’s function method. The dependences of the frequency and damping of the averaged plasma waves, as well as the position ν m and width Δν of the peak of the imaginary part of the Fourier trans-form of the averaged Green’s function, on the wave vector k have been determined in the self-consistent approximation, which makes it possible to take into account multiple scattering of plasma waves by inhomogeneities. It has been found that, in the long-wavelength region of the spectrum, the decrease revealed in the frequency of the plasma waves is caused by the inhomogeneities, which agrees qualitatively with the behavior of the position of the peak ν m . In the range of large values of the correlation length of inhomogeneities and small values of k, the damping of the plasma waves tends to zero, whereas the width of the peak Δν remains finite, which is due to the nonuniform broadening. A comparison with the data of numerical calculations has been performed.

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Публикация на русском языке Маньков, Юрий Иннокентьевич. Объемные плазменные волны в случайно-неоднородном проводнике [Текст] / Ю. И. Маньков // Физ. тверд. тела : Физико-технический институт им. А.Ф.Иоффе РАН, 2012. - Т. 54 Вып. 7. - С. 1249-1255

Доп.точки доступа:
Маньков, Юрий Иннокентьевич
}
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Cobalt-based bulk nanostructured materials prepared via the dynamic compacting of core–shell composite particles / E. A. Denisova [et al.] // Bull. Russ. Acad. Sci. Phys. - 2016. - Vol. 80, Is. 11. - P. 1377-1380, DOI 10.3103/S1062873816110198. - Cited References: 12. - This work was supported by the Russian Foundation for Basic Research, project nos. 15-08-06673, 16-03-00969, and RFBR and KRFS 15-42-04171. . - ISSN 1062-8738
Кл.слова (ненормированные):
Composite materials -- Bulk nanostructured materials -- Chemical deposition -- Cobalt-based -- Composite particles -- Dynamic compaction -- Magnetic characteristic -- Nano-structured -- Structural and magnetic characteristics -- Powders
Аннотация: Bulk nanostructured Co–P/Cu and Al2O3/Co–P composites are fabricated via dynamic compaction. The initial core–shell particles are synthesized by means of chemical deposition. Structural and magnetic characteristics of the composites are investigated. It is shown that the use of composite particles allows homogeneous compacts with the structure and magnetic characteristics of initial powders to be obtained. © 2016, Allerton Press, Inc.

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Публикация на русском языке Объемные наноструктурированные материалы на основе кобальта, полученные динамическим компактированием композиционных частиц “ядро–оболочка” [Текст] / Е. А. Денисова [и др.] // Изв. РАН. Сер. физич. - 2016. - Т. 80 № 11. - С. 1555-1558

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Krasnoyarsk Institute of Railway Engineering, Krasnoyarsk, Russian Federation
ZAO Pulsed Technologies, Krasnoyarsk, Russian Federation
Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Denisova, E. A.; Денисова, Елена Александровна; Kuzovnikova, L. A.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Kuzovnikov, A. A.; Nemtsev, I. V.; Mal'tsev, V. K.; Мальцев, Вадим Константинович
}
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10.

Contributions from Inter-grain Boundaries to the Magneto-resistive Effect in Polycrystalline High-T (C) Superconductors. The Underlying Reason of Different Behavior for YBCO and BSCCO Systems / D. A. Balaev [et al.] // J. Supercond. Nov. Magn. - 2011. - Vol. 24, Is. 7. - P. 2129-2136, DOI 10.1007/s10948-011-1166-9. - Cited References: 30. - This work is supported by program N5 of RAS, project N7. . - ISSN 1557-1939

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   PHASE-SLIP
   TRANSPORT-PROPERTIES
   TRANSITION
   FIELD
   COMPOSITES
   BULK
   TAPES
   YBA2CU3O7-DELTA
   DISSIPATION
Кл.слова (ненормированные):
BSCCO -- YBCO -- Intergrain boundaries -- Magnetoresistance -- BSCCO -- Intergrain boundaries -- Magnetoresistance -- YBCO -- BSCCO -- BSCCO system -- Comparative studies -- High Tc superconductors -- High-field -- Inter-grain -- Irreversibility lines -- Magneto-resistive effect -- Polycrystalline -- Resistive transition -- Standard measurements -- Weak pinning -- YBCO -- Bismuth -- Electric resistance -- Grain boundaries -- High temperature superconductors -- Lead -- Magnetic fields -- Magnetoelectronics -- Magnetoresistance -- Magnetos -- Superconductivity -- Yttrium barium copper oxides -- Semiconductor metal boundaries
Аннотация: In order to clarify the mechanisms in charge of broadening of resistive transition R(T) in magnetic fields of bismuth-based polycrystalline high-T (C) superconductor (HTSC), a comparative study of Bi1.8Pb0.3Sr1.9Ca2Cu3O (x) (BSCCO) and YBa2Cu3O7-delta (YBCO) have been performed. Magnetoresistive effects and irreversibility line obtained from magnetic measurements have been studied. It was established that (1) for YBCO, the smooth part of R(T) dependence unambiguously corresponds to dissipation in the intergrain boundaries for arbitrary magnetic fields; (2) for polycrystalline BSCCO, the smooth part of R(T) dependences correspond to dissipation within intergrain boundary subsystem in the field range H <10(2) Oe only, while standard measurements of R(T) dependences in magnetic field range H > 10(2) Oe reflect the dissipation processes occurring both in intergrain boundary and HTSC grain subsystems; (3) for the high-field range, the contribution from intergrain boundaries of BSCCO can be distinguished from magnetoresistance R(H) dependences obtained at high enough current density on textured samples. It is proposed that various magneto-resistive properties of these classical HTSC systems are due comparatively weak pinning in BSCCO.

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Держатели документа:
[Balaev, D. A.
Popkov, S. I.
Semenov, S. V.
Bykov, A. A.
Dubrovskiy, A. A.
Shaikhutdinov, K. A.
Petrov, M. I.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Balaev, D. A.
Popkov, S. I.
Sabitova, E. I.
Dubrovskiy, A. A.
Shaikhutdinov, K. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Semenov, S. V.; Семенов, Сергей Васильевич; Bykov, A. A.; Быков, Алексей Анатольевич; Sabitova, E. I.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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