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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : NESTEROV A. I., Ovchinnikov S. G.
Заглавие : ACOUSTIC-WAVE AMPLIFICATION IN FAST CRYSTALLIZATION
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1988. - Vol. 30, Is. 1. - P184-186. - ISSN 0367-3294
Примечания : Cited References: 14
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Aleksandrov K. S., Tressaud A., Grannec J., Couzi M.
Заглавие : Phase transitions in elpasolites (ordered perovskites)
Место публикации : Materials Science and Engineering R: Reports. - 1998. - Vol. 24, Is. 3. - P.81-151. - ISSN 0927-796X
Примечания : Cited References: 174
Предметные рубрики: ELASTIC NEUTRON-DIFFRACTION
MII = CO
RAMAN-SCATTERING
THERMODYNAMIC PROPERTIES
CRYSTAL-STRUCTURE
SINGLE-CRYSTALS
RB2KMIIIF6 ELPASOLITES
CUBIC PEROVSKITES
TEMPERATURE FORM
HIGH-RESOLUTION
Ключевые слова (''Своб.индексиров.''): crystal atomic structure--crystal growth--crystal lattices--crystallization--crystallography--ferroelectricity--hydrostatic pressure--order disorder transitions--single crystals--thermodynamics--elpasolites--landau theory--perovskite
Аннотация: Many compounds with general chemical formula A2BB?X6 and with tolerance factor value t < 1 crystallize in the elpasolite (ordered perovskite) structure. Different preparative methods have been considered. For example, the Bridgman technique is the most suitable method of growing single crystals of halogenated elpasolites with monoatomic cations. Group-theory and symmetry analyses have allowed us to build a scheme of possible structural distortions connected with octahedral rotations and displacements of ions. Experimental observations have proven that ferroelastic phase transitions occurring most frequently in elpasolites are due to small octahedra tilts. Quantitative analysis allows the possibility of describing these transitions in the framework of the thermodynamic Landau theory. Hydrostatic pressure and the substitution of atoms in different crystallographic sites allow to change significantly the succession and the temperature of phase transitions. The hypothesis of bond stresses is able to predict the possible occurrence of a phase transition for a particular elpasolite and/or the role of the octahedra rotations in the transformation. The mechanism of phase transitions in elpasolites and related compounds has also been considered. One can assume that a displacive mechanism associated with a strong anharmonicity plays a large role in phase transitions occurring in compounds with monoatomic cations. On the other hand, for instance, in cryolites with ammonium cations, the transitions originate from an order-disorder phenomenon. В© 1998 Elsevier Science S.A. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Bykova L. E., Bondarenko G. N.
Заглавие : Multiple self-propagating high-temperature synthesis and solid-phase reactions in thin films
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 1999. - Vol. 88, Is. 5. - P963-967. - ISSN 1063-7761, DOI 10.1134/1.558878
Примечания : Cited References: 28
Предметные рубрики: DENSE BRANCHING MORPHOLOGY
SINGLE-CRYSTAL GROWTH
PATTERN-FORMATION
AL-GE
CHEMICAL-REACTIONS
CRYSTALLIZATION
SEPARATION
HEAT
Аннотация: A variety of self-propagating high-temperature synthesis in thin films has been found and investigated. This modification, called multiple self-propagating high-temperature synthesis, occurs in the solid phase and is a reversible phase transition. Multiple self-propagating high-temperature synthesis is similar in many respects to a metal-insulator phase transition. It is shown that for eutectic systems it is equivalent to a repeated transition through the eutectic temperature of bulk samples. It is inferred that multiple self-propagating high-temperature synthesis in bilayer films is governed by phase separation mechanisms that take place during eutectic solidification and eutectoid decomposition. (C) 1999 American Institute of Physics. [S1063-7761(99)01705-9].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G.
Заглавие : Oscillations of the crystallization front of adsorbed water
Место публикации : JETP Letters. - 2000. - Vol. 72, Is. 1. - P.4-6. - ISSN 0021-3640, DOI 10.1134/1.1311396
Примечания : Cited References: 25
Предметные рубрики: RAPID SOLIDIFICATION
PATTERN-FORMATION
INSTABILITIES
EQUILIBRIUM
ALLOYS
Аннотация: Relaxation oscillations of the crystallization front in a gradient temperature field have been observed for water adsorbed on a metal film deposited on a glass substrate. The metal film plays an important role in heat removal from the crystallization front and determines the existence of oscillations. A possible mechanism is proposed for the development of oscillations. It is shown that the oscillations observed are similar to the oscillations of the front of self-propagating high-temperature synthesis. (C) 2000 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zharkov S. M., Kveglis L. I.
Заглавие : Electron-beam-initiated crystallization of iron-carbon films
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2004. - Vol. 46, Is. 5. - P969-974. - ISSN 1063-7834, DOI 10.1134/1.1744977
Примечания : Cited References: 34
Предметные рубрики: AMORPHOUS-GERMANIUM FILMS
EXPLOSIVE CRYSTALLIZATION
PATTERN-FORMATION
TEMPERATURE
MICROSCOPY
MECHANISM
Аннотация: A structure formed in nanocrystalline iron-carbon films exposed to an electron beam was studied. Explosive crystallization (EC) with the formation of dendrite and cellular-dendritic instabilities at a rate of up to 1 cm/s was observed. It was shown that the dependence between the growth rate of dendrite branches (or cells) during EC and the rounding radius of dendrite branch tips can be approximately described by equations used to calculate the crystal growth in supercooled melts. To explain the EC mechanism, a model of a liquid zone formed at the crystallization front was used. It was shown that the liquid zone arises due to energy accumulated in the film in the nanocrystalline state. It was assumed that this energy was accumulated due to the energy of elastic stresses. (C) 2004 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Balaev A. D., Ivanova N. B., Ovchinnikov S. G.
Заглавие : Mossbauer magnetization and resistivity studies of Fe1.91V0.09BO4
Разночтения заглавия :авие SCOPUS: Mossbauer magnetization and resistivity studies of Fe1.91V 0.09BO4
Место публикации : Physica B: ELSEVIER SCIENCE BV, 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P1324-1326. - ISSN 0921-4526, DOI 10.1016/j.physb.2005.01.396
Примечания : Cited References: 8
Предметные рубрики: FE2OBO3
Ключевые слова (''Своб.индексиров.''): mott-hubbard system--magnetism--new materials--magnetism--mott-hubbard system--new materials--crystallization--crystallography--fermi level--ferrimagnetism--magnetism--magnetization--mossbauer spectroscopy--phase transitions--single crystals--x ray diffraction analysis--charge ordering--electron-electron interactions--mott-hubbard system--new materials--iron compounds
Аннотация: Single crystals of Fe1.91V0.09BO4 were prepared by spontaneous crystallization using a solution melt technology for the first time and its structure, electronic and magnetic properties were investigated by X-ray diffraction, Mossbauer spectroscopy, magnetization and electrical measurements. Room-temperature Mossbauer measurements indicate that "localized" (Fe2+, Fe3+) and "delocalized" (Fe2.5+) states in ratio 0.31:0.345:0.345 distributed over two crystallographically non-equivalent positions exist. The results of magnetic measurements show that warwickite is a P-type ferrimagnet below T = 130 K. Resistivity measurements show a variable-range-hopping when electron-electron interactions cause a soft Coulomb gap in the density of states at the Fermi energy. (c) 2005 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kveglis L. I., Seredkin V. A., Kuzovnikov A. V.
Заглавие : Scale invariance of the structure upon explosive crystallization of amorphous films
Место публикации : JETP Letters. - 2005. - Vol. 82, Is. 1. - P.22-25. - ISSN 0021-3640, DOI 10.1134/1.2045332
Примечания : Cited References: 19
Аннотация: Experimental results that are obtained in the process of the explosive crystallization of x-ray amorphous films Fe2Tb and CoPd with magnetic anisotropy perpendicular to the film plane are reported. The internal bending of thus obtained "single crystals" reaches 100 deg/mu m. An explanation of the mechanism and kinetics of explosive crystallization in the Fe2Tb and CoPd films is proposed in the framework of the shear transformation zone theory. (C) 2005 Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bezmaternykh L. N., Temerov V. L., Gudim I. A., Stolbovaya N.A.
Заглавие : Crystallization of trigonal (Tb,Er)(Fe,Ga)(3)(BO3)(4) phases with hantite structure in bismuth trimolybdate-based fluxes
Место публикации : Crystallogr. Rep. - 2005. - Vol. 50. - P.S97-S99. - ISSN 1063-7745, DOI 10.1134/1.2133981
Примечания : Cited Reference Count: 8
Предметные рубрики:
Аннотация: The stability regions of the trigonal (Tb,Er)(Fe,Ga)(3)(BO3)(4) phases are established in (Bi2Mo3O12)-based fluxes. The specific features of heterogeneous nucleation and the subsequent phase transformations during transition to the equilibrium are studied in the vicinity of the boundaries. The temperature modes of single crystal growth on seeds are suggested with due regard for the "nonequilibrium effect." (C) 2005 Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fausti D., Nugroho A. A., van Loosdrecht PHM, Klimin S. A., Popova M. N., Bezmaternykh L. N.
Заглавие : Raman scattering from phonons and magnons in RFe3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Raman scattering from phonons and magnons in RFe3 (BO3) 4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2006. - Vol. 74, Is. 2. - Ст.24403. - ISSN 1098-0121, DOI 10.1103/PhysRevB.74.024403
Примечания : Cited References: 26
Предметные рубрики: IRON BORATE GDFE3(BO3)(4)
LIGHT-SCATTERING
CRYSTALS
ND
CRYSTALLIZATION
TRANSITIONS
GENERATION
LASER
Аннотация: Inelastic light scattering spectra of several members of the RFe3(BO3)(4) family reveal a cascade of phase transitions as a function of temperature, starting with a structural, weakly first-order, phase transition followed by two magnetic phase transitions. Those consist of the ordering of the Fe-spin sublattice, revealed by all the compounds, and a subsequent spin-reorientational transition for GdFe3(BO3)(4). The Raman data evidence a strong coupling between the lattice and magnetic degrees of freedom in these borates. The Fe-sublattice ordering leads to a strong suppression of the low-energy magnetic scattering, and a multiple peaked two-magnon scattering continuum is observed. Evidence for short-range correlations is found in the "paramagnetic" phase by the observation of a broad magnetic continuum in the Raman data, which persists up to surprisingly high temperatures.
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10.

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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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kveglis L. I., Zhigalov V. S.
Заглавие : Directional crystallization and self-assembling initiated by mechanical shock or electron beam in nanocrystalline Co-C and Fe-C films
Место публикации : Surface Science: Elsevier Science Publishing Company, Inc., 2007. - Т. 601, № 13. - С. 2873-2875. - ISSN 0039-6028, DOI 10.1016/j.susc.2006.12.044
ГРНТИ : 31.15
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Chukalina E. P., Stanislavchuk T. N., Malkin B. Z., Zakirov A. R., Antic-Fidancev E., Popova E. A., Bezmaternykh L. N., Temerov V. L.
Заглавие : Optical spectra, crystal-field parameters, and magnetic susceptibility of multiferroic NdFe3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Optical spectra, crystal-field parameters, and magnetic susceptibility of multiferroic Nd Fe3 (B O3) 4
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2007. - Vol. 75, Is. 22. - Ст.224435. - ISSN 1098-0121, DOI 10.1103/PhysRevB.75.224435
Примечания : Cited References: 22
Предметные рубрики: IRON BORATE GDFE3(BO3)(4)
CRYSTALLIZATION
SPECTROSCOPY
LASER
ND3+
Аннотация: We report high-resolution optical absorption spectra for NdFe3(BO3)(4) trigonal single crystal, which is known to exhibit a giant magnetoelectric effect below the temperature of magnetic ordering T-N=33 K. The analysis of the temperature-dependent polarized spectra reveals the energies and, in some cases, symmetries and exchange splittings of Nd3+ 84 Kramers doublets. We perform crystal-field calculations starting from the exchange-charge model, obtain a set of six real crystal-field parameters, and calculate wave functions and magnetic g factors. In particular, the values g(perpendicular to)=2.385 and g(parallel to)=1.376 were found for the Nd3+ ground-state doublet. We obtain B-loc=7.88 T and parallel to J(FN)parallel to=0.48 K for the values of the local effective magnetic field at liquid-helium temperatures at the Nd3+ site and the Nd-Fe exchange integral, respectively, using the experimentally measured Nd3+ ground-state splitting of 8.8 cm(-1). To check the reliability of our set of crystal-field parameters, we model the magnetic susceptibility data from literature. A dimer containing two nearest-neighbor iron ions in the spiral chain is considered to partly account for quasi-one-dimensional properties of iron borates, and then the mean-field approximation is used. The results of calculations with the exchange parameters for Fe3+ ions J(nn)=-6.25 K (intrachain interactions) and J(nnn)=-1.92 K (interchain interactions) obtained from fitting agree well with the experimental data.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Voronov V. N., Nikolayeva T. V.
Заглавие : Crystallization and studies of A+B3+F4 compounds
Коллективы : "Advanced inorganic fluorides", International Siberian workshop
Место публикации : Advanced inorganic fluorides: the Third International Siberian workshop Intersibfluorine - 2008, September 01-06, 2008, Vladivostok, Russia : proceedings of ISIF-2008. - Vladivostok, 2008. - p.200-203. - ISBN 978-5-98128-036-8
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14.

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.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Гаврилюк, Анатолий Петрович, Исаев, Иван Леонидович, Карпов, Сергей Васильевич, Герасимов, Валерий Сергеевич
Заглавие : Электронный туннельный эффект и особенности кристаллизации наноразмерных золей металлов
Место публикации : Инженерная физика. - Москва: Общество с ограниченной ответственностью Издательство Научтехлитиздат, 2009. - № 2. - С. 51-53. - ISSN 2072-9995
Предметные рубрики:
Ключевые слова (''Своб.индексиров.''): nano particles--наночастицы--tunnel effect--bimodal bands--туннельный эффект--бимодальный ансамбль
Аннотация: Исследуются закономерности самоорганизации бимодальных ансамблей наночастиц в кристаллические структуры в лиозолях металлов (на примере органозолей золота) методом броуновской динамики. Показана возможность селективной коагуляции разно-размерных частиц вследствие асимметрии встречных туннельных электронных потоков межу частицами разных размеров и их взаимного разнополярного заряжения; исследуется кинетика этого процесса.Explored conformity to the law organizations of bimodal bands of nano particles in crystalline structures in liozole metals (for example of organozole gold) by the method of brownian dynamics. Possibility of selective coagulation of particles of different-sizes is shown because of asymmetry of meetings tunnel electronic streams boundary path by the particles of different sizes and their mutual different arctic loading; explored kinetics of this process.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I., Kliava J.
Заглавие : Oxide glasses with magnetic nanoparticles: transparent magnets (Faraday rotation and electron magnetic resonance studies)
Коллективы : RFBR-CNRS [07-02-92174]
Разночтения заглавия :авие SCOPUS: Oxide glasses with magnetic nanoparticles: Transparent magnets (Faraday rotation and electron magnetic resonance studies)
Место публикации : Phys. Status Solidi B. - 2009. - Vol. 246, Is. 10. - P.2216-2231. - ISSN 0370-1972, DOI 10.1002/pssb.200945169
Примечания : Cited References: 87. - This work is supported in part by RFBR-CNRS joint project, grant No 07-02-92174. We are grateful to E. Petrakovskaja and O. Ivanova for measuring and discussing, respectively, the EMR spectra in thermally treated samples and the FR spectral and magnetic field dependences.
Предметные рубрики: SPIN-HAMILTONIAN PARAMETERS
SINGLE-DOMAIN PARTICLES
SUPERPARAMAGNETIC RESONANCE
CRYSTALLIZATION BEHAVIOR
FERRIMAGNETIC RESONANCE
PARAMAGNETIC-RESONANCE
TEMPERATURE-DEPENDENCE
COMPUTER-SIMULATIONS
FINE PARTICLES
BORATE GLASSES
Аннотация: In the first part of this paper we outline the state of the art in the field of magnetic nanoparticles in oxide glasses. We describe the theoretical background of two complementary techniques used for the studies of the state of paramagnetic ions, clusters and magnetic particles in a diamagnetic matrix, viz., magnetooptical Faraday rotation (FR) and electron magnetic resonance (EMIR) and we overview previous results obtained with these techniques for several glass systems. In the second part, we highlight the case of potassium-alumina-borate glasses - a glassy system where doping with paramagnetic oxides results in formation of magnetic particles at very low contents of paramagnetic additions: Fe(2)O(3) and MnO. In the special case when the ratio of the iron and manganese oxides in the charge is 3/2, magnetic nanoparticles with characteristics close to those of manganese ferrite are formed already at the first stage of the glass preparation. After thermal treatment all glasses show FR and EMR spectra attesting to the presence of superparamagnetic nanoparticles, characterized by relatively broad size and shape distributions. The formation of magnetic nanoparticles confers to these glasses magnetic and magnetooptical properties typical of magnetically ordered substances. At the same time, the glasses remain transparent in a part of the visible and near infrared spectral range and display a high FR value. Such properties make them particularly interesting for use as new media for various magneto-optical devices. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavriliuk A. P., Isaev I. L., Karpov S. V., Krasnov I. V., Shaparev N. Y.
Заглавие : Brownian dynamic of laser cooling and crystallization of electron-ion plasma
Место публикации : Phys. Rev. E. - 2009. - Vol. 80, Is. 5. - Ст.56404. - ISSN 1539-3755, DOI 10.1103/PhysRevE.80.056404
Примечания : Cited References: 29
Предметные рубрики: ULTRACOLD NEUTRAL PLASMAS
OPTICAL MOLASSES
LIQUIDS
ATOMS
TRAP
Ключевые слова (''Своб.индексиров.''): brownian motion--laser cooling--plasma collision processes--plasma light propagation--plasma nonlinear processes--plasma simulation--plasma transport processes--brownian dynamics--brownian dynamics simulations--electron ion plasma--electron subsystem--friction force--ionic structure--nonlinear dependence--plasma cooling--brownian movement--crystallization--ions--laser cooling--lasers--cooling
Аннотация: Laser cooling and crystallization of electron-ion plasma is studied using the Brownian dynamics simulation technique and taking into consideration the interaction of ions with the electron subsystem. It has been shown that the nonlinear dependence of laser friction force on the velocity of ions has to be taken into account in order to simulate in an adequate manner the cooling dynamics and obtain a correct estimate for minimum temperatures. It has been found that times required for formation of an ordered ionic structure can be much longer than the typical plasma cooling time.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Eremin E. V., Sablina K. A., Sapronova N. V.
Заглавие : Dielectric properties of a mixed-valence Pb3Mn7O15 manganese oxide
Коллективы :
Разночтения заглавия :авие SCOPUS: Dielectric properties of a mixed-valence Pb3Mn7O 15 manganese oxide
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2010. - Vol. 22, Is. 37. - Ст.375901. - ISSN 0953-8984, DOI 10.1088/0953-8984/22/37/375901
Примечания : Cited References: 14. - This study was supported by the Russian Foundation for Basic Research 'Siberia', project No. 09-02-98003, and the Siberian Branch of the Russian Academy of Sciences, integration project No. 101.
Ключевые слова (''Своб.индексиров.''): cation--lead--manganese derivative--oxide--article--chemical model--chemistry--crystallization--electric conductivity--electronics--methodology--temperature--cations--crystallization--electric conductivity--electronics--lead--manganese compounds--models, chemical--oxides--temperature--ac electric field--analysis of resistivity--carrier hopping--charge ordering--complex dielectric constant--crystal site--debye models--dielectric constants--dielectric spectra--frequency windows--lattice sites--low frequency--manganese ions--mixed valence--mixed valence state--relaxation behaviors--temperature range--electric fields--manganese--manganese oxide--permittivity--single crystals--crystal symmetry
Аннотация: We investigated the low-frequency dielectric properties of a Pb3Mn7O15 single crystal with manganese ions in the mixed-valence state (Mn3+/Mn4+). Dielectric relaxation was found in the frequency window from 20 to 100 kHz in the temperature range 110-180 K. The dielectric spectra of the crystal were analyzed using a Debye model. Estimations made within the model and analysis of resistivity data suggest that the relaxation behavior of the dielectric constant is related to polaronic charge carrier hopping. Around 250 K, charge ordering occurs in the crystal when the Mn3+ and Mn4+ ions are arranged in a specific order among the crystal sites. With a decrease in temperature, an ac electric field can induce a charge hop between the equivalent lattice sites available, related to crystal symmetry. This hopping is equivalent to the reorientation of an electric dipole that yields Debye-type behavior of the complex dielectric constant. The observed anisotropy in the behavior of the dielectric properties and resistivity can be attributed to a pronounced two-dimensional character of the crystal structure.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Ryabinkina L. I., Romanova O. B., Har'kov A. M., Gorev M. V., Balaev A. D., Eremin E. V., Bovina A. F.
Заглавие : The magnetoelastic effect in CoxMn1-xS solid solutions
Коллективы :
Разночтения заглавия :авие SCOPUS: The magnetoelastic effect in Cox Mn1 - x S solid solutions
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 2010. - Vol. 150, Is. 13-14. - P564-567. - ISSN 0038-1098, DOI 10.1016/j.ssc.2010.01.009
Примечания : Cited References: 13. - This work was supported by the Russian Foundation for Basic Research projects no. 08-02-00364-a, no. 08-02-90031, no. F08037, F08-229, and no. 09-02-00554-a.
Предметные рубрики: YVO3 SINGLE-CRYSTAL
SPIN-STATE
TRANSITION
TRANSPORT
PHYSICS
LACOO3
Ключевые слова (''Своб.индексиров.''): semiconductors--x-ray scattering--galvanomagnetic effects--thermal expansion--semiconductors--x-ray scattering--galvanomagnetic effects--thermal expansion--semiconductors--x-ray scattering--coefficient of thermal expansion--magnetoelastic effects--orbital ordering--temperature hysteresis--temperature range--zero magnetic fields--crystallization--electric resistance--magnetic field effects--magnetoresistance--manganese--manganese compounds--neon--organic polymers--scattering--semiconductor quantum dots--solid solutions--solidification--thermal stress--x ray scattering--thermal expansion
Аннотация: The magnetization of cation-substituted CoxMn(1-x)S sulfides upon cooling in zero magnetic field and in a field in the temperature range 4-300 K has been measured and the resistance versus magnetic field (up to 10 kOe) dependences have been obtained. Magnetoresistance and temperature hysteresis of magnetization versus prehistory are found at the magnetic field H 0.1 T and at T 240 K. The interrelation between the magnetic and elastic subsystems of the CoxMn1-xS solid solutions has been established. A jump in the coefficient of thermal expansion is observed at the Neel temperature. The features of the physical properties are explained by orbital ordering. (C) 2010 Elsevier Ltd. All rights reserved.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Romanova O. B., Ryabinkina L. I., Sokolov V. V., Pichugin A. Y., Velikanov D. A., Balaev D. A., Galyas A. I., Demidenko O. F., Makovetskii G. I., Yanushkevich K. I.
Заглавие : Magnetic properties and the metal-insulator transition in GdXMn1-XS solid solutions
Коллективы :
Разночтения заглавия :авие SCOPUS: Magnetic properties and the metal-insulator transition in GdX Mn1 - X S solid solutions
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 2010. - Vol. 150, Is. 13-14. - P602-604. - ISSN 0038-1098, DOI 10.1016/j.ssc.2009.12.042
Примечания : Cited References: 13. - This study was supported by the Russian Foundation for Basic Research project No. 09-02-00554_a; No. 09-02-92001-NNS_a; No. 08-02-90031 Bel_a and Belarus Foundation for Basic Research project No. F04-182; ADTF "Development of scientific potential of the higher school" No. 2.1.1/401.
Ключевые слова (''Своб.индексиров.''): insulator--metals--crystal growth--phase transitions--insulator--metals--crystal growth--phase transitions--insulator--metals--antiferromagnetic semiconductors--crystal growth--cubic lattice--metal-insulator phase transition--orders of magnitude--p-type--temperature range--thermoelectric properties--thermopowers--antiferromagnetic materials--antiferromagnetism--crystal growth--crystallization--electric properties--gadolinium--grain boundaries--magnetic fields--magnetic properties--manganese--manganese compounds--metal insulator boundaries--metals--semiconductor growth--semiconductor insulator boundaries--sodium chloride--solid solutions--solidification--metal insulator transition
Аннотация: The structural, magnetic, electrical, and thermoelectric properties of GdXMn1-XS (0.01
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