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Semenov, S. V.
Temperature behavior of the magnetoresistance hysteresis in a granular high-temperature superconductor: Magnetic flux compression in the intergrain medium / S. V. Semenov, D. A. Balaev // Physica C. - 2018. - Vol. 550. - P. 19-26, DOI 10.1016/j.physc.2018.04.005. - Cited References: 56. - The work was supported by the Russian Science Foundation (Grant No. 17-72-10050 ). . - ISSN 0921-4534
Кл.слова (ненормированные):
Barium compounds -- Copper compounds -- Grain boundaries -- Hysteresis -- Magnetic flux -- Magnetic moments -- Magnetization -- Magnetoresistance -- Yttrium barium copper oxides
Аннотация: Granular high-temperature superconductors (HTSs) are characterized by the hysteretic behavior of magnetoresistance. This phenomenon is attributed to the effective field in the intergrain medium of a granular HTS. At the grain boundaries, which are, in fact, weak Josephson couplings, the dissipation is observed. The effective field in the intergrain medium is a superposition of the external field and the field induced by magnetic moments of HTS grains. Meanwhile, analysis of the field width of the R(H) magnetoresistance hysteresis ΔH = Hdec − Hinc at Hdec = const, where Hinc and Hdec are increasing and decreasing branches of the R(H) hysteretic dependence, shows that the effective field in the intergrain medium exceeds by far both the external field and the field induced by magnetic moments of HTS grains. This situation suggests the magnetic flux compression in the intergrain medium because of the small length of grain boundaries, which amounts to ∼1 nm, i.e., is comparable with the coherence length and corresponds to Josephson tunneling in HTS materials. In this work, using the previously developed approach, we examine experimental data on the magnetoresistance and magnetization hysteresis in the granular YBa2Cu3O7 HTS compound in the range from 77 K to the critical temperature. According to the results obtained, the degree of magnetic flux compression determined by the parameter α in the expression for the effective field Beff(H) = H − 4π M(H) α in the intergrain medium remains constant over the investigated temperature range. All the features of the observed evolution of the R(H) hysteretic dependences are explained well within the proposed approach when the expression for Beff(H) contains the experimental M(H) magnetization data and the parameter α of about 20–25. The latter is indicative of the dominant effect of magnetic flux compression in the intergrain medium on the transport properties of granular HTS materials.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Семенов, Сергей Васильевич
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Effect of A-site cation ordering on the thermoelectric properties of the complex cobalt oxides Gd1-xSrxCoO3-δ (x = 0.8 and 0.9) / V. A. Dudnikov [et al.] // Ceram. Int. - 2018. - Vol. 44, Is. 9. - P. 10299-10305, DOI 10.1016/j.ceramint.2018.03.037. - Cited References: 38. - This work was supported by the Russian Science Foundation , project no. 16-13-00060. . - ISSN 0272-8842
Кл.слова (ненормированные):
Substituted rare earth cobalt oxides -- Thermoelectric oxide materials -- Ordered and disordered states
Аннотация: The effect of substitution of Sr2+ ions for Gd3+ ions on the phase composition, electrical resistivity, thermoelectricity, and thermal conductivity of rare-earth cobalt oxides Gd1-xSrxCoO3-δ (x = 0.8 and 0.9) has been investigated. It has been determined that at the investigated strontium concentrations, the single-phase disordered nonstoichiometric cubic perovskites and superstructures with ordered Sr2+/Gd3+ ions and anion vacancies can be formed. The influence of ordering/disordering of Gd and Sr cations over crystal-lattice A- sites on the thermoelectric figure of merit and sample stability at high temperatures has been studied. The thermoelectric figure of merit of the disordered samples was found to exceed by far the analogous parameter of the ordered samples, which allows us to consider the disordering as a way of improving the thermoelectric parameters. Two contributions to the conductivities are discussed: high-temperature thermoactivation and low-temperatures variable range hopping. The parameters of the Mott electronic structure, including DOS N(εF), hopping energy ε (the energy of hopping conductivity activation), and hopping length Rh, have been estimated.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russian Federation
Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russian Federation

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Kazak, N. V.; Казак, Наталья Валерьевна; Fedorov, A. S.; Федоров, Александр Семенович; Solov'yov, L. A.; Vereshchagin, S. N.; Burkov, A. T.; Novikov, S. V.; Gavrilkin, S. Yu.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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    Вальков, Валерий Владимирович.
    Квантовый транспорт через одномерную цепочку, согнутую в форме квадрата, при учете спин-орбитального взаимодействия Рашбы / В. В. Вальков, А. Д. Федосеев // 20-й Междунар. симп. "Порядок, беспорядок и свойства оксидов" (ODPO-20) : труды симпозиума. - 2017. - Вып. 20, Т. 1. - С. 30-34. - Библиогр.: 5 назв.
   Перевод заглавия: Quantum transport through the 1D square-shaped wire with Rashba spin-orbit coupling
Аннотация: В приближении сильной связи при использовании формализма Ландауэра-Бюттикера исследованы транспортные свойства одномерной цепочки, согнутой в форме квадрата при учете спин-орбитального взаимодействия Рашбы. Обнаружено, что такая геометрия устройства, приводит к возникновению антирезонансов Фано. Показано, что при критической величине спин-орбитального взаимодействия, когда характеристическая длина, связанная с величиной спин-орбитального взаимодействия, совпадает с длиной стороны квадрата, возникает полное отражение от устройства. При величине параметра спин-орбитального взаимодействия близкого к критическому значению прохождение электрона возможно только при энергиях, находящихся в пределах узких интервалов.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Федосеев, Александр Дмитриевич; Fedoseev, A. D.; Val'kov, V. V.; Южный федеральный университет; "Порядок, беспорядок и свойства оксидов", международный междисциплинарный симпозиум(20 ; 2017 ; 5-10 сент. / Ростов-на-Дону / Южный, Ростовская обл.); "Order, Disorder and Properties of Oxides", International meeting(20 ; 2017 г. ; sent. ; 5-10 / Rostov-on-Don / Yuzhny, Russia)
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Crystal formation of Cu-Mn-containing oxides and oxyborates in bismuth-boron fluxes diluted by MoO3 and Na2CO3 / E. Moshkina [et al.] // J. Cryst. Growth. - 2018. - Vol. 503. - P. 1-8, DOI 10.1016/j.jcrysgro.2018.09.011. - Cited References: 26. - This study was supported by Russian Foundation for Basic Research (RFBR) according to the research project No. 17-02-00953 A. . - ISSN 0022-0248
Кл.слова (ненормированные):
Characterization -- Growth from solutions -- Single crystal growth -- Manganites -- Magnetic materials
Аннотация: The high-temperature crystallizing phases of fluxes (molten solutions) based on Bi2O3:MoO3 = 1:3 and diluted by Na2CO3 and B2O3 (under varying of Na2CO3:B2O3), and by CuO and Mn2O3 (0 ≤ Mn2O3:CuO ≤ 5) are studied. The conditions of the stable crystallization of Mn2+1−xCuxMoO4, Mn23+O3, Mn2+Mn23+O4, Mn2+1−xCuxMn3+BO4 and Mn2+2−xCuxMn3+BO5 have been found. The influence of MoO3 and Na2CO3 to the crystallization processes of Mn2+- and Mn3+-containing Mn2+1−xCuxMoO4 and Mn2+Mn23+O4 and Mn23+O3 are clarified. The occurrence of the chemical bonds of these types at the crystallization of Mn-heterovalent Mn2+1−xCuxMn3+BO4 and Mn2+2−xCuxMn3+BO5 oxyborates is studied. Single crystal growth techniques of these oxyborates are suggested. The results of the structural and magnetic characterization of some discussed compounds are presented.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, 660037, Russian Federation
V.S. Sobolev Institute of Geology and Mineralogy, SB RAS, Novosibirsk, 630090, Russian Federation
Novosibirsk State University, Novosibirsk, 630090, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Seryotkin, Y.; Bovina, A. F.; Бовина, Ася Федоровна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Eremin, E. V.; Еремин, Евгений Владимирович; Belskaya, N.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
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Study of iron oxide magnetic nanoparticles obtained via pulsed laser ablation of iron in air / V. A. Svetlichnyi [et al.] // Appl. Surf. Sci. - 2018. - Vol. 462. - P. 226-236, DOI 10.1016/j.apsusc.2018.08.116. - Cited References: 29. - This study was supported by Russian Science Foundation (RSF), Project # 18-19-00268. . - ISSN 0169-4332
Кл.слова (ненормированные):
Pulsed laser ablation in air -- Iron oxides -- Nanostructures -- Magnetic properties -- Thermal transformation
Аннотация: Magnetic nanoparticles were obtained using the nanosecond pulsed laser ablation (Nd:YAG laser, 1064 nm, 7 ns) of an iron target in air at atmospheric pressure. The particles obtained were further annealed at four different temperatures. The composition, structure and properties of all obtained powders were investigated using X-ray diffraction (XRD), DSC, attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR), Raman spectroscopy, TEM, SAED and other techniques. The initial sample was found to contain monoclinic magnetite and iron nitrides. Presumably, magnetite presents in the form of spherical particles with the distribution maximum of 12–15 nm, and nitrides take the form of lamellas and rolls. Thermal treatment of the sample led to particle enlargement and phase transformations, first, to cubic magnetite, then to a Fe3O4, α-Fe2O3 and γ-Fe2O3 mixture, and finally to the pure hematite phase. Zeta-potential, BET surface area and magnetic properties changed with the annealing as well. The obtained materials exhibited different properties that make them in demand in different fields, from biomedicine to technology.

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Держатели документа:
Siberian Physical-Technical Institute of Tomsk State University, Novosobornaya sq., 1, Tomsk, 634050, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Svetlichnyi, V. A.; Shabalina, A. V.; Lapin, I. N.; Goncharova, D. A.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Sokolov, A. Е.; Соколов, Алексей Эдуардович
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Localization and transfer of charge carriers in CuO nanopowder by impedance spectroscopy / A. A. Lepeshev [et al.] // J. Mater. Sci.: Mater. Electron. - 2018. - Vol. 29, Is. 14. - P. 12118–12125, DOI 10.1007/s10854-018-9319-2. - Cited References: 26. - The work was performed with a support of the Grant of the Russian Science Foundation (Project No. 16-19-10054). . - ISSN 0957-4522
Кл.слова (ненормированные):
Copper oxides -- Electric charge -- Electric fields -- Electrodes -- Metal nanoparticles -- Permittivity -- Spectroscopy
Аннотация: Particular electro-physical characteristics of CuO nanopowder were investigated by impedance spectroscopy using a sensor based on interdigitated structure in the frequency range from 1 Hz to 100 MHz. The results of investigation were considered. Simulation of impedance spectra by equivalent electric circuits was carried out for numerical approximations of the frequency dependences of the dielectrical permittivity and conductivity. Electric charge accumulation of on the boundaries of nanoparticles and near the metal electrodes of the sensor was revealed. It was shown that a double electric layer is formed near the electrodes, which leads to the appearance of anomalously large values of dielectrical permittivity and an increase in the conductivity in the low-frequency region. The obtained results can be explained by proton conductivity in the nanopowder caused by moisture which is adsorbed on the surface of the nanoparticles. It was shown that after high-temperature annealing of CuO nanopowders, accumulation of electric charges was not observed. It was established that hopping or polaron conductivity occurs in the annealed CuO samples, which increases with increasing electric field frequency according to the power law with a fractional exponent.

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Держатели документа:
Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Science, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Siberian Branch, Kirensky Institute of Physics, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Lepeshev, A. A.; Drokin, N. A.; Дрокин, Николай Александрович; Ushakov, A. V.; Karpov, I. V.; Fedorov, L. Y.; Bachurina, E. P.
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    The investigation of the influence of oxygen concentration in the gas mixture on nanodispersed oxides synthesis / I. V. Karpov [et al.] // IOP Conf. Ser.: Mater. Sci. Eng. - 2017. - Vol. 255, Is. 1. - Ст. 012008, DOI 10.1088/1757-899X/255/1/012008. - Cited References: 25
   Перевод заглавия: Исследование влияния концентрации кислорода в газовой смеси на синтез нанодисперсных оксидов
Кл.слова (ненормированные):
Cathodes -- Electrodes -- Particle size -- Vacuum applications -- Average particle size -- Cathode process -- Discharge gaps -- Energy of ions -- Influence of oxygen -- Low pressure arc -- Oxides synthesis -- Superheated gas -- Gases
Аннотация: Thermal effects in cathode space of low-pressure arc discharge, which contribute to the synthesis of nanopowders with an average particle size of less than 10 nm, are considered. One of the most important parameters, characterizing the cathode processes of vacuum arc, is a voltage drop across the discharge gap. All the gases demonstrate a decrease of a voltage drop across the discharge gap under the condition ofincreasing the gas pressure in the range of p = 10-3 - 1 Pa. Dissipation of energy of ions and electrons on gas molecules causes abrupt heating of the gas. Heat, coming from gas plasma, has a significant impact on evaporating material of a cathode. It can be assumed that a microdrop fraction, formed as a result of a cathode spraying in a liquid phase, will further evaporate in a superheated gas.

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Доп.точки доступа:
Karpov, I. V.; Ushakov, A. V.; Lepeshev, A. A.; Лепешев, Анатолий Александрович; Fedorov, L. Y.; Dorozhkina, E. A.; Karpova, O. N.; Shaikhadinov, A. A.; Demin, V. G.; Bachurina, E. P.; Lichargin, D. V.; Abkaryan, A. K.; Zeer, G. M.; Зеер Г.М.; Zharkov, S. M.; Жарков, Сергей Михайлович; International Scientific Conference Reshetnev Readings(20 ; 2016 ; Nov. 9-12 ; Krasnoyarsk)
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Effect of cation ordering on a-sites on the physical properties of substituted rare-earth cobaltite oxides GD1-XSRXCOO3-Δ / V. A. Dudnikov [et al.] // Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 4PO-I-48. - P. 878

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Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Gavrilkin, S. Yu.; Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Solovyov, L. A.; Соловьев, Леонид Александрович; Vereshchagin, S. N.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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    Верещагин, С. Н.
    Изучение фазового перехода порядок-беспорядок в нестехиометрическом Sr-Gd-кобальтате методами ДСК, ТГ и РСА / С. Н. Верещагин, В. А. Дудников, Л. А. Соловьев // Журн. СФУ. Сер. "Химия". - 2016. - Т. 9, № 3. - С. 326-336 ; J. Sib. Fed. Univ. Chem., DOI 10.17516/1998-2836-2016-9-3-326-336. - Библиогр.: 26. - Исследование выполнено при финансовой поддержке Российского фонда фундаментальных исследований, Правительства Красноярского края, Красноярского краевого фонда поддержки научной и научно-технической деятельности в рамках научного проекта 16-43-240505 «р_а». . - ISSN 1998-2836. - ISSN 2313-6049
   Перевод заглавия: DSC+TG and XRD study of order-disorder transition in nonstoichiometric Sr-Gd-cobaltate
Рубрики:
PEROVSKITE-TYPE OXIDES
   PHASE-TRANSITION
   OXYGEN SORPTION
   PERFORMANCE
Кл.слова (ненормированные):
perovskite -- order-disorder -- phase transition -- DSC -- перовскит -- порядок-беспорядок -- фазовый переход -- ДСК
Аннотация: Методами термического и рентгеноструктурного анализа в интервале температур 11001473 К изучен процесс взаимопревращения тетрагонального перовскита Sr ( 0.8 ) Gd ( 0.2 ) CoO ( 3-d ) с упорядоченным расположением катионов Sr/Gd и анионных вакансий в кубическую разупорядоченную модификацию. Показано, что фазовое превращение протекает как размытый фазовый переход первого рода. Процесс разупорядочения не зависит от скорости нагрева и контролируется термодинамическими характеристиками процессов в кристалле, тогда как процесс образования упорядоченной тетрагональной структуры контролируется кинетическими факторами. Проведен количественный анализ температурной зависимости теплоемкости на основе размытых фазовых переходов.
Process of interconversion of tetragonal Sr(0.8) Gd(0.2) CoO(3-d) (with ordered Sr/Gd cations and anion vacancies) to cubic one (with disordered structure) was studied by X-ray structural and thermal analysis at 1100-1473 K. It was shown that the transformation is a first order diffuse phase transition. The ramp rate does not affect cation and anion vacancies disordering which is controlled by thermodynamic parameters of the processes in the solid whereas cubic to tetragonal transition is kinetically controlled. A theory of diffuse phase transition was applied to quantitatively analyze heat capacity temperature dependence.

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Держатели документа:
Институт химии и химической технологии СО РАН
Институт физики им. Л. В. Киренского СО РАН

Доп.точки доступа:
Дудников, Вячеслав Анатольевич; Dudnikov, V. A.; Соловьев, Леонид Александрович; Solovyov L. A.; Vereshchagin S. N.

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10.

Phase transformation behavior of Sr0.8Gd0.2CoO3-delta perovskite in the vicinity of order-disorder transition / S. N. Vereshchagin [et al.] // Thermochim. Acta. - 2017. - Vol. 655. - P. 34-41, DOI 10.10164/j.tca.2017.06.003. - Cited References:40. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project #16-43-240505 p_a and #16-02-00507A. . - ISSN 0040-6031. - ISSN 1872-762X

РУБ Thermodynamics + Chemistry, Analytical + Chemistry, Physical
Рубрики:
OXYGEN SORPTION
   OXIDES
   PERFORMANCE
   DIFFUSE
   LN
Кл.слова (ненормированные):
Perovskite -- Ruddlesden-Popper phase -- Order-disorder -- Phase transition -- DSC
Аннотация: The phase transformation behavior of a single-phase tetragonal Sr0.8Gd0.2CoO3-δ (with ordered distribution of Sr2+/Gd3+ cations and anion vacancies) was investigated by TG–DSC and XRD at 1100–1473 K and oxygen partial pressure p(O2) from 1 to 5·104 Pa. The first-order smeared order-disorder (o-d) phase transition involving heat absorption was observed at about 1383 K under O2-Ar flow with p(O2) > 2.5 kPa. The crystal structure of the high-temperature phase was found to be cubic perovskite with disordered Sr2+/Gd3+ cations and anion vacancies. The temperature of o-d transition at p(O2) > 2.5 kPa was not influenced by the heating rate or oxygen partial pressure. It was shown that at p(O2) < 2.5 kPa the o-d transition gives rise to Sr0.8Gd0.2CoO3−δ decomposition to form CoO and Sr2.4Gd0.6Co2O7-δ − Ruddlesden-Popper type phase with novel composition. The phase boundaries between the ordered tetragonal Sr0.8Gd0.2CoO3−δ, disordered cubic Sr0.8Gd0.2CoO3−δ and CoO + Sr2.4Gd0.6Co2O7-δ composite as a function of temperature and p(O2) values were determined.

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Держатели документа:
Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia.
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Vereshchagin, S. N.; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Shishkina, N. N.; Solovyov, L. A.; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-43-240505 p_a, 16-02-00507A]
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