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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ганженко, Игорь Михайлович, Якубайлик, Эдуард Константинович, Зарщикова Г. Г., Камалова Т. Б., Алексеева Л. А.
Заглавие : Снижение засоренности конечного концентрата на Абагурской обогатительной фабрике
Место публикации : Черная металлургия: Бюлл. науч.-тех. и экономич. информации : ЦНИИТЭИ черной металлургии, 2017. - № 3. - С. 39-44. - ISSN 0135-5910
Ключевые слова (''Своб.индексиров.''): обогатительная фабрика--мокрое обогащение--засоренность конечного концентрата--магнетитовое железо--магнитные системы сепараторов--феррит бария--неодим-железо-бор--напряженность магнитного поля--concentration plant--wet concentration--final concentrates dirtiness--magnetite iron--magnetic separator systems--barium ferrite--nd-fe-b composite--magnetic field strength
Аннотация: Приведены результаты изучения засоренности конечного концентрата Абагурской обогатительной фабрики ОАО “Евразруда”. Установлены достижимые границы разделения по содержанию магнетитового железа для сепараторов ПБМ с магнитными системами из композита Nd-Fe-B. Рекомендовано полностью заменить в магнитных системах сепараторов ПБМ феррит бария на композит неодим-железо-бор.The results of the investigation into the dirtiness of the final concentrates at the Abagurskaya Concentration Plant at the OAO “Evrazruda” have been presented. The achievable limits of the separation according to the magnetite iron content in case of the PBM separator with the magnetic systems from the Nd-Fe-B composite have been established. It has been recommended to fully replace the barium ferrite by the Nd-Fe-B composite in the magnetic systems of the PBM separators.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Aleksandrovsky A. S., Zaitsev A. I., Slabko V. V.
Заглавие : Čerenkov nonlinear diffraction in random nonlinear photonic crystal of strontium tetraborate
Место публикации : Appl. Phys. Lett.: American Institute of Physics, 2012. - Vol. 101, Is. 21. - Ст.211114. - ISSN 0003-6951, DOI 10.1063/1.4767385
Примечания : Cited References: 29. - The work was supported by RFBR through the Grant No. 12-02-31167, by the Ministry of Education and Science of Russian Federation (Contract No. 14.B37.21.0730 and Grant No. 2.1.1/3455), by RAS Projects 24.29 and 24.31, by PSB RAS Projects 2.5.2 and 3.9.5, by SB RAS Projects 43 and 101, and by SFU Grant F12.
Предметные рубрики: POLED LITHIUM-NIOBATE
2ND-HARMONIC GENERATION
BARIUM NIOBATE
PULSES
Аннотация: Čerenkov-type second harmonic generation of femtosecond pulses in random one-dimensional nonlinear photonic crystal of strontium tetraborate is investigated experimentally and theoretically. Sidebands in angular-spectral dependence of generated second harmonic were detected and found to be in perfect agreement with calculations. Spectral maximum of generated radiation experiences deviation from Čerenkov relation due to influence of nonlinear photonic crystal structure. Pulse duration and local spectrum of Čerenkov second harmonic are measured and found to be in fair agreement with each other.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Popov M. A.
Заглавие : On the coordinate of a singular point of time correlation functions for the system of nuclear magnetic moments of a crystal
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2003. - Vol. 97, Is. 1. - P78-84. - ISSN 1063-7761, DOI 10.1134/1.1600799
Примечания : Cited References: 22
Предметные рубрики: DIPOLAR FLUCTUATION SPECTRUM
FREE-INDUCTION DECAY
CROSS-RELAXATION
DOUBLE-RESONANCE
SPIN SYSTEMS
NMR-SPECTRA
LINE SHAPE
IRREVERSIBILITY
ABSORPTION
CAF2
Ключевые слова (''Своб.индексиров.''): absorption spectroscopy--barium compounds--crystallography--lattice constants--magnetic fields--nuclear magnetic resonance--absorption spectrum--dipole-dipole interaction--magnetic field directions--nuclear magnetic moments--magnetic moments
Аннотация: The hypothesis concerning the existence of singular points on the imaginary time axis for a correlation function of a system with the dipole-dipole interaction of nuclear spins of a crystal is verified. Within the framework of the self-consistent fluctuating field theory taking into account the principal corrections related to the correlation of local fields, a result for this coordinate is obtained in terms of the ratios of lattice sums. Experimental values of this coordinate are calculated from the wings of the nuclear magnetic resonance absorption spectrum of a BaF2 crystal for the magnetic field directions along the three crystallographic axes. Good agreement of the theoretical and experimental results justifies this hypothesis. (C) 2003 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhandun V. S., Zamkova N. G., Zinenko V. I.
Заглавие : Lattice dynamics, ferroelectric and antiferroeelctric instabilities, and the ferroelectric phase transition in disordered PbB(1/2)' B(1/2)'' O(3) (B ' = Ga, In, Lu; B '' = Nb, Ta) solid solutions
Разночтения заглавия :авие SCOPUS: Lattice dynamics, ferroelectric and antiferroeelctric instabilities, and the ferroelectric phase transition in disordered PbB′ 1/2B″1/2O3 (B′ = Ga, In, Lu; B″ = Nb, Ta) solid solutions
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 106, Is. 6. - P1109-1117. - ISSN 1063-7761, DOI 10.1134/S1063776108060101
Примечания : Cited References: 29
Предметные рубрики: STATISTICAL-MECHANICS
PEROVSKITES
CRYSTALS
ORDER
RELAXOR
BATIO3
PBTIO3
Ключевые слова (''Своб.индексиров.''): crystal lattices--ferroelectricity--lattice vibrations--solids--ferroelectric (barium strontium titanate)--ferroelectric phase transitions--lattice (co)--lattice dynamics--vibration spectrum--ferroelectric materials
Аннотация: The lattice vibration spectra, rf permittivity, and dynamic Born charges of disordered PbB(1/2)'B(1/2)'' O(3) (B' = Ga, In, Lu; B '' = Nb, Ta) solid solutions are calculated in terms of the generalized Gordon-Kim model. All the compounds are found to have soft modes related to the center (Gamma(15)) and boundary point R (R(15)) of the Brillouin zone; the frequencies of these modes are close. The ferroelectric phase transition temperatures and the spontaneous polarization in the ferroelectric phase are calculated for the solid solutions using a model Hamiltonian in the local mode approximation and the Monte Carlo method. These temperatures for the tantalum compounds are found to be higher than for the niobium compounds, and temperature t(s) increases with the atomic number of ion B'. A model where the antiferroelectric state is related to the condensation of modes Gamma(15) and R(15) is proposed. It is found that, for all compounds except for PbSc(1/2)Nb(1/2)O(3) and PbSc(1/2)Ta(1/2)O(3), the ferroelectric phase, which is only related to the condensation of mode R(15), and the antiferroelectric phase have similar energies. In PbIn(1/2)Ta(1/2)O(3), the antiferroelectric phase turns out to be energetically favorable.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pugachev A. M., Zaytseva I. V., Krylov A. S., Malinovsky V. K., Surovtsev N. V., Borzdov Y. M., Kovalevsky V. I.
Заглавие : Uniaxial mechanical stresses and their influence on the parameters of the ferroelectric phase transition in pressure-treated barium titanate
Место публикации : Ferroelectrics: Taylor & Francis, 2017. - Vol. 508, Is. 1. - P.161-166. - ISSN 00150193 (ISSN), DOI 10.1080/00150193.2017.1289769
Примечания : Cited References: 22
Ключевые слова (''Своб.индексиров.''): batio3--second harmonic generation--residual mechanical stresses--ferroelectric phase transition
Аннотация: The dependence of the E(TO) line in Raman spectrum of a BaTiO3 powder on applied uniaxial pressure up to 14 GPa are obtained and the values of residual mechanical stresses are evaluated. The second harmonic generation technique is used to obtain the width and temperature of the cubic-to-tetragonal phase transition in the powder treated by uniaxial pressures. The interrelations between the phase transition width, temperatures, and residual mechanical stresses are established. These interrelations differ from expectations based on known hydrostatic pressure-induced effects in BaTiO3.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A.S., Vyunishev A. M., Zaitsev A.I., Zamkov A. V., Slabko V.V.
Заглавие : Tunable femtosecond frequency doubling in random domain structure of strontium tetraborate
Место публикации : Opt. Commun. - 2009. - Vol. 282, Is. 11. - P.2263-2266. - ISSN 0030-4018, DOI 10.1016/j.optcom.2009.02.070
Примечания : Cited Reference Count: 16. - Гранты: The work was supported by the RFBR Grant 09-02-00670, Grants of the President of the Russian Federation for the support of leading scientific schools (Nos. SS-1011.2008.2 and SS-3818.2008.3), Grant No. RNP.2.1.1.3455, and the Projects 2.5.2 of PSB RAS, Nos. 5 and 27.1 of SB RAS.Финансирующая организация: RFBR [09-02-00670]; President of the Russian Federation [SS-1011.2008.2, SS-3818.2008.3]; PSB RAS [2.5.2]; SB RAS [5, 27.1]; [RNP.2.1.1.3455]
Предметные рубрики: 2ND-HARMONIC GENERATION
HARMONIC-GENERATION
BARIUM NIOBATE
CRYSTAL
Ключевые слова (''Своб.индексиров.''): domain structures--femtosecond--frequency-doubling--harmonic frequencies--noncollinear--nonlinear photonic crystals--photonic structures--second harmonics--second-harmonic generations--spatial spectrum--tetraborate--harmonic generation--photonic crystals--strontium--harmonic analysis
Аннотация: Efficient tunable femtosecond phase-matched noncollinear second-harmonic generation in randomized nonlinear photonic crystal of strontium tetraborate is obtained. Spatial spectrum of nonlinear photonic structure is not flat but enables tuning of the harmonic frequency in the range from 355 to 460 nm. The narrowing of the bandwidth of second harmonic is found to be of order of 10-20%. (C) 2009 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskiy A. A., Shaykhutdinov K. A., Popkov S. I., Petrov M. I.
Заглавие : Time relaxation of residual resistance of HTSC-based composites
Место публикации : Physica C: ELSEVIER SCIENCE BV, 2007. - Vol. 460: 8th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (JUL 09-14, 2006, Dresden, GERMANY). - P1309-1310. - ISSN 0921-4534, DOI 10.1016/j.physc.2007.03.347
Примечания : Cited References: 5
Предметные рубрики: SUPERCONDUCTORS
Ключевые слова (''Своб.индексиров.''): granular htsc--resistance--relaxation--magnetic flux--granular htsc--magnetic flux--relaxation--resistance--copper oxides--crystallites--magnetic flux--magnetic relaxation--magnetization--yttrium barium copper oxides--anderson-like relaxation processes--flux trapping--residual resistance--time relaxation--josephson junction devices
Аннотация: Magnetoresistance curves R(H) and time relaxation of the residual resistance of bulk YBCO + CuO composites have been studied. These composites represent the network of Josephson junctions, where CuO acts as a barrier between YBCO grains. It has been shown that hysteresis of the R(H) dependences is related to the flux trapping within the YBCO crystallites. This flux induces magnetic field in the intergrain media. Time relaxation of the residual resistance is caused by relaxation of the magnetization of YBCO grains. The time dependence of the residual resistance obeys a logarithmic law, which describes the Anderson-like relaxation processes in the YBCO grains. (c) 2007 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Bondarev V. S., Flerov I. N., Maglione M., Simon A., Sciau P., Boulos M., Guillemet-Fritsch S.
Заглавие : Thermal expansion, polarization and phase diagrams of Ba1-yBi2y/3Ti1-xZrxO3 and Ba1-yLayTi1-y/4O3 compounds
Коллективы : Russian Foundation for Basic Research [07-02-00069]; Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools [NSh-1011.2008.2]
Разночтения заглавия :авие SCOPUS: Thermal expansion, polarization and phase diagrams of Ba 1-yBi2y/3Ti1-xZrxO3 and Ba1-yLayTi1-y/4O3 compounds
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2009. - Vol. 21, Is. 7. - Ст.75902. - С. P. - ISSN 0953-8984, DOI 10.1088/0953-8984/21/7/075902
Примечания : Cited References: 28. - This work was supported by the Russian Foundation for Basic Research ( project no. 07-02-00069) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools ( project no. NSh-1011.2008.2).
Предметные рубрики: HEAT-CAPACITY
CERAMICS
BA(TI1-XZRX)O-3
FERROELECTRICS
BEHAVIOR
BATIO3
BATI0.65ZR0.35O3
CONDUCTIVITY
PEROVSKITES
CHEMISTRY
Ключевые слова (''Своб.индексиров.''): barium--dielectric properties--lanthanum--phase diagrams--polarization--thermal stress--zirconium--ceramic compositions--root mean squares--temperature ranges--temperature-dependent measurements--thermal expansion co-efficient--thermal-expansion properties--thermal expansion
Аннотация: The thermal expansion properties of the ceramic compositions Ba1-yLayTi1-y/4O3 (y = 0.0, 0.026, 0.036, 0.054) and Ba1-yBi2y/3Ti1-xZrxO3 (y = 0.10; x = 0.0, 0.04, 0.05, 0.10, 0.15) were determined in the temperature range 120-700 K. We report the temperature- dependent measurements of the strain, thermal expansion coefficient and the magnitude of root mean square polarization. The results obtained are discussed together with the data on the structure and dielectric properties.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Bondarev V. S., Maglione M., Simon A.
Заглавие : Thermal expansion and permittivity of (Ba1-xBi2x/3)TiO3 solid solutions
Разночтения заглавия :авие SCOPUS: Thermal expansion and permittivity of (Ba 1 - xBi 2x/3)TiO 3 solid solutions
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 53, Is. 10. - P2073-2079. - ISSN 1063-7834, DOI 10.1134/S1063783411100143
Примечания : Cited References: 24. - This study was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools (grant NSh-4645.2010.2).
Предметные рубрики: BARIUM-TITANATE
CERAMICS
BATIO3
BEHAVIOR
PHASE
FERROELECTRICS
Аннотация: The strain, the thermal expansion coefficient, and the permittivity of ceramic samples of (Ba1 - x Bi-2x/3)TiO3 solid solutions with x = 0, 0.01, 0.03, and 0.05 have been studied in the temperature range 120-700 K. Based on an analysis of the results, the temperature-composition phase diagram has been refined, and the temperature dependence of the polarization has been calculated.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pugachev A. M., Zaytseva, I., V, Malinovsky V. K., Surovtsev, N., V, Gorev M. V., Ivleva L. I., Lykov P. A.
Заглавие : Temperature dependence of the spontaneous polarization, acoustic and strain anomalies in strontium barium niobate crystals of different chemical compositions probed by the second harmonic generation technique
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00399, 19-42-543-016, AAAA-A17-117052410033-9]
Место публикации : Ferroelectrics. - 2020. - Vol. 560, Is. 1. - P.54-60. - ISSN 0015-0193, DOI 10.1080/00150193.2020.1722883. - ISSN 1563-5112(eISSN)
Примечания : Cited References: 19. - This work was supported by the Russian Foundation for Basic Research, projects no. 18-02-00399 and 19-42-543-016 and State assignment No AAAA-A17-117052410033-9.
Предметные рубрики: SINGLE-CRYSTALS
RELAXOR
GROWTH
Аннотация: In SrxBa1-xNb2O6 crystals (x = 0.33, 0.5, 0.61, and 0.75), temperature dependences of spontaneous polarization, strain, elastic modules, and second harmonic generation (SHG) signal are compared. It is revealed that SHG describes the temperature dependences of dipole moments in polar nanoregions in paraelectric phase. In the vicinity of the phase transition in paraelectric phase, SHG reflects the temperature behavior of relatively large and long-lived polar asymmetric regions as indicated by the presence of the intermediate temperature range on the temperature dependence of this nonlinear response.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Bezmaternykh L. N., Gudim I. A., Sheptyakov D., Bayukov O. A., Vorotynov A. M., Velikanov D. A., Bovina A. F.
Заглавие : Synthesis and properties of barium ferrigermanate Ba2Fe2GeO7
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 11. - P2114-2118. - ISSN 1063-7834
Примечания : Cited References: 14
Предметные рубрики: COPPER METABORATE
Аннотация: The magnetic susceptibility and specific heat of single crystals of the Ba2Fe2GeO7 barium ferrigermanate are investigated. It is revealed that the temperature dependence of the magnetic susceptibility exhibits a kink at a temperature T = 8.5 K. The number of nonequivalent positions of Fe3+ ions and their occupancies are determined using Mossbauer spectroscopy. It is shown that the Fe3+ ions located in tetrahedral positions T2 are ordered incompletely, which is inconsistent with the results obtained previously. An assumption is made regarding the possible ground magnetic state of the Ba2Fe2GeO7 compound. (c) 2005 Pleiades Publishing, Inc.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Khrustalev B. P., Krivomazov S. N., Петров, Михаил Иванович, Vasilyev A. D., Zwegintsev S. A.
Заглавие : Superconductivity near liquid nitrogen temperature in the Sn-Ba-Sr-Y-Cu-O system
Место публикации : Physica C-Superconductivity and its Applications. - 1989. - Vol. 161, Is. 4. - P.493-496. - ISSN 0921-4534, DOI 10.1016/0921-4534(89)90087-7
Ключевые слова (''Своб.индексиров.''): ceramic materials--tin compounds--bulk superconductivity--high temperature superconductors--oxide superconductors--tin barium strontium yttrium copper oxide--superconducting materials
Аннотация: A high-Tc phase was found in the Sn-Ba-Sr-Y-Cu-O system. DC susceptibility data of Sn2Ba2Sr0.5Y0.5Cu3Ox show a single transition to bulk superconductivity with an onset temperature of 86 K. В© 1989.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Prus A. G., Shaykhutdinov K. A., Gokhfeld D. M., Petrov M. I.
Заглавие : Study of dependence upon the magnetic field and transport current of the magnetoresistive effect in YBCO-based bulk composites
Место публикации : Supercond. Sci. Technol.: IOP PUBLISHING LTD, 2007. - Vol. 20, Is. 6. - P495-499. - ISSN 0953-2048, DOI 10.1088/0953-2048/20/6/002
Примечания : Cited References: 25
Предметные рубрики: CERAMIC SUPERCONDUCTORS
DISSIPATION
TRANSITION
SENSORS
MOTION
FILMS
Ключевые слова (''Своб.индексиров.''): current voltage characteristics--lorentz force--magnetic field effects--magnetic flux--magnetic sensors--magnetoresistance--intergrain boundaries--magnetic field sensor devices--magnetoresistance curves--magnetoresistive properties--yttrium barium copper oxides
Аннотация: The magnetoresistive properties of bulk YBCO + CuO and YBCO + BaPb0.75Sn0.25O3 composites for different orientations of external magnetic field H and macroscopic transport current j have been measured. These composites exhibit large magnetoresistance in weak magnetic fields ( 100 Oe), which makes them promising candidates for practical application in magnetic field sensor devices. The difference between.( T) dependences, magnetoresistance curves R( H) and current - voltage characteristics measured for H parallel to j and H || j is observed indicating the presence of the Lorentz- force- dependent dissipation in the composites. Angular dependences of magnetoresistance R(theta) ( where theta
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Bezmaternykh L. N., Gudim I. A., Bayukov O. A., Vorotynov A. M., Bovina A. F., Szymczak R., Baran M., Ritter C.
Заглавие : Spin glass state in crystals of barium ferrigermanate Ba2Fe2GeO7
Разночтения заглавия :авие SCOPUS: Spin glass state in crystals of barium ferrigermanate Ba2Fe 2GeO7
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48, Is. 10. - P1906-1908. - ISSN 1063-7834, DOI 10.1134/S1063783406100155
Примечания : Cited References: 5
Аннотация: The temperature dependence of the magnetization and elastic neutron scattering spectra of Ba2Fe2GeO7 barium ferrigermanate polycrystals are studied. The magnetization is found to depend on the magnetic prehistory of a Ba2Fe2GeO7 sample below T = 8 K. Analysis of the neutron scattering spectra does not reveal long-range magnetic order down to 2 K. Our experimental data indicate the existence of a spin glass state in Ba2Fe2GeO7 polycrystals.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Semenov S. V., Balaev D. A.
Заглавие : Temperature behavior of the magnetoresistance hysteresis in a granular high-temperature superconductor: Magnetic flux compression in the intergrain medium
Место публикации : Physica C. - 2018. - Vol. 550. - P.19-26. - ISSN 09214534 (ISSN), DOI 10.1016/j.physc.2018.04.005
Примечания : Cited References: 56. - The work was supported by the Russian Science Foundation (Grant No. 17-72-10050 ).
Ключевые слова (''Своб.индексиров.''): 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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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shtarev, Dmitry S., Shtareva, Anna, V, Kevorkyants, Ruslan, Molokeev M. S., Serpone, Nick
Заглавие : Revisiting the BaBiO3 semiconductor photocatalyst: synthesis, characterization, electronic structure, and photocatalytic activity
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-73-10013]
Место публикации : Photochem. Photobiol. Sci. - 2021. - Vol. 20, Is. 9. - P.1147-1160. - ISSN 1474-905X, DOI 10.1007/s43630-021-00086-y. - ISSN 1474-9092(eISSN)
Примечания : Cited References: 48. - We wish to thank the Russian Science Foundation for a Grant (Project No. 19-73-10013) in support of our study. The authors are also grateful to the staff of the following Institutes/Centers for their valuable technical assistance and in providing the needed equipment: (i) the Khabarovsk Innovation and Analytical Center of the Yu. A. Kosygin Institute of Tectonics and Geophysics FEB RAS; and (ii) the Resource Centers of the Research Park at Saint-Petersburg State University, especially the Center for Physical Methods of Surface Investigation and the Nanophotonics Center. One of us (NS) is grateful to the staff of the PhotoGreen Laboratory of the University of Pavia, Italy, for their continued hospitality
Предметные рубрики: RHODAMINE-B
OXIDE
DRIVEN
SUPERCONDUCTIVITY
PSEUDOPOTENTIALS
Аннотация: This article revisits the properties of BaBiO3 examined extensively in the last two decades because of its electronic properties as a superconductor and as a semiconductor photocatalyst. Solid-state syntheses of this bismuthate have often involved BaCO3 as the barium source, which may lead to the formation of BaBiO3/BaCO3 heterostructures that could have an impact on the electronic properties and, more importantly, on the photocatalytic activity of this bismuthate. Accordingly, we synthesized BaBiO3 by a solid-state route to avoid the use of a carbonate; it was characterized by XRD, SEM, and EDX, while elemental mapping characterized the composition and the morphology of the crystalline BaBiO3 and its thin films with respect to structure, optoelectronic, and photocatalytic properties. XPS, periodic DFT calculations, and electrochemical impedance spectroscopy ascertained the electronic and electrical properties, while Raman and DRS spectroscopies assessed the relevant optical properties. The photocatalytic activity was determined via the degradation of phenol in aqueous media. Although some results accorded with earlier studies, the newer electronic structural data on this bismuthate, together with the photocatalytic experiments carried out in the presence of selective radical trapping agents, led to elucidating some of the mechanistic details of the photocatalytic processes that previous views of the BaBiO3 band structure failed to address or clarify. Analytical refinement of the XRD data inferred the as-synthesized BaBiO3 adopted the C2/m symmetry rather than the I2/m structure reported earlier, while Tauc plots from DRS spectra yielded a bandgap of 2.05 eV versus the range of 1.1–2.25 eV reported by others; the corresponding flatband potentials were 1.61 eV (EVB) and − 0.44 eV (ECB). The photocatalytic activity of BaBiO3 was somewhat greater than that of the well-known Evonik P25 TiO2 photocatalyst under comparable experimental conditions.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskiy A. A., Shaykhutdinov K. A., Popkov S. I., Petrov M. I.
Заглавие : Peculiarities of the time evolution of magnetoresistance of granular HTSC in a constant applied magnetic field
Коллективы :
Место публикации : Solid State Commun. - 2008. - Vol. 147, Is. 7-8. - P.284-287. - ISSN 0038-1098, DOI 10.1016/j.ssc.2008.05.044
Примечания : Cited References: 17. - This work was Supported by program "Quantum macrophysics" No. 3.4 of RAS and integration project No. 3.4 of SB RAS and in part by KSF, grant 18G011. D.A.B. and A.A.D. acknowledge the Russian Science Support Foundation.
Предметные рубрики: CRITICAL-STATE
SUPERCONDUCTORS
COMPOSITES
HYSTERESIS
RESISTANCE
Ключевые слова (''Своб.индексиров.''): superconductors--flux pinning and creep--tunneling--superconductors--flux pinning and creep--tunneling--agricultural products--carbon fiber reinforced plastics--copper oxides--electric conductivity--electric resistance--evolutionary algorithms--ferromagnetism--galvanomagnetic effects--grain (agricultural product)--health--hysteresis--magnetic devices--magnetic field effects--magnetic field measurement--magnetic fields--magnetic materials--magnetoelectronics--magnetoresistance--semiconductor metal boundaries--superconducting magnets--superconductivity--yttrium barium copper oxides--p ,p ,t measurements--applied (co)--applied magnetic fields--constant magnetic field (cmf)--elsevier (co)--evolution (co)--external fields--field induced--flux creep--hysteretic behavior--josephson couplings--low magnetic fields--magnetic (ce)--poly crystalline--superconducting grains--time evolutions--time relaxation--magnetism
Аннотация: The time evolution of the magnetoresistance of bulk YBCO + CuO composites at T = 4.2 K in constant applied magnetic fields was studied to clarify the mechanism of hysteretic behavior of magnetoresistance R(H) of granular HTSC. The composites represent "model" granular HTSC with weakened Josephson coupling between superconducting (YBCO) crystallites. It was found for the first time that on the ascending branch of R(H) dependence, the resistance at H = const decreased with time while on the descending branch, the resistance increased with time in ail applied constant magnetic field. In the range of low magnetic fields (below the minimum point of the descending branch of the R(H) dependence), the resistance at H const decreased again. Similar measurements performed oil pure polycrystalline YBCO at T = 77.4 K have shown that the behavior of evolution of resistance with time is similar to that observed for the composite. This proves the peculiarity of time evolution of maignetoresistance to be a common feature of granular HTSCs. The behavior revealed is well described by the model Of granular HTSC, where the intergrain media is in an effective magnetic field which is the superposition of the external field and the field induced by superconducting grains. The time evolution of resistance reflects the time relaxation of magnetization of HTSC grains due to the intragrain flux Creep Processes. (C) 2008 Elsevier Ltd. All rights reserved.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Vasilyev A. D., Zwegintsev S. A., Петров, Михаил Иванович, Khrustalev B. P.
Заглавие : Peculiarities of the resistive state of the (Y,Lu)1Ba2Cu3O7-δ superconducting ceramics
Место публикации : Physica C. - 1988. - Vol. 156, Is. 2. - P.249-250. - ISSN 0921-4534
Ключевые слова (''Своб.индексиров.''): ceramic materials--oxides--current voltage characteristics--yttrium barium copper oxides--superconducting materials
Аннотация: The resistive state of the high-Tc superconducting ceramics (Y, Lu)1Ba2Cu3O7-δ has been investigated, a hysteresis instability has been discovered in the current-voltage characteristics (CVC) under a current density j ≈ 1.7 kA cm-2. © 1988.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Slabko V. V., Baturin I. S., Akhmatkhanov A. R., Shur V. Y.
Заглавие : Nonlinear Raman-Nath diffraction of femtosecond laser pulses
Коллективы : Russian Federation [MK-250.2013.2]; Krasnoyarsk Regional Fund for Science and Technical Activity Support; RAS grant [24.31]; Ural Federal University Development Program
Место публикации : Opt. Lett.: Optical Society of America, 2014. - Vol. 39, Is. 14. - P.4231-4234. - ISSN 0146-9592, DOI 10.1364/OL.39.004231. - ISSN 1539-4794
Примечания : Cited References: 22. - This work was partially supported by the Grant of the President of the Russian Federation MK-250.2013.2, Krasnoyarsk Regional Fund for Science and Technical Activity Support and by the RAS grant no. 24.31. A. A. acknowledges the financial support of young scientists through the Ural Federal University Development Program. The authors thank A. S. Chirkin and I. V. Timofeev for fruitful discussions and A. V. Barannik for optical microscopy of the samples.
Предметные рубрики: STRONTIUM BARIUM NIOBATE
2nd-HARMONIC GENERATION
PHOTONIC STRUCTURES
DOMAIN-STRUCTURE
LITHIUM-NIOBATE
CRYSTAL
Аннотация: We study the nonlinear Raman–Nath diffraction (NRND) of femtosecond laser pulses in a 1D periodic nonlinear photonic structure. The calculated second-harmonic spectra represent frequency combs for different orders of transverse phase matching. These frequency combs are in close analogy with the well-known spectral Maker fringes observed in single crystals. The spectral intensity of the second harmonic experiences a redshift with a propagation angle, which is opposite the case of Čerenkov nonlinear diffraction. We analyze how NRND is affected by the group-velocity mismatch between fundamental and second-harmonic pulses and by the parameters of the structure. Our experimental results prove the theoretical predictions.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov M. A., Zavislyak I. V., Movchan N. N., Gudim, I. A., Srinivasan G.
Заглавие : Mode splitting in 37-42 GHz barium hexaferrite resonator: Theory and device applications
Место публикации : IEEE Trans. Magn.: IEEE-Institute Electrical and Electronics Engineers, 2014. - Vol. 50, Is. 6. - Ст.4004507. - ISSN 0018-9464, DOI 10.1109/TMAG.2014.2298498. - ISSN 1941-0069
Примечания : Cited References: 34
Предметные рубрики: MILLIMETER-WAVE APPLICATIONS
GUIDE JUNCTION CIRCULATORS
FERRITE
MICROWAVE
PROPAGATION
CYLINDERS
Ключевые слова (''Своб.индексиров.''): dielectric resonance--ferromagnetic resonance (fmr)--hexagonal ferrite--isolator--phase shifter
Аннотация: Dielectric resonances in the 37-42 GHz frequency band in the single crystal barium hexaferrite that occur well below the ferromagnetic resonance (FMR) have been investigated. Sample dimensions have been chosen so that the mode frequency is lower than the spin-wave excitation (in this case, the natural domain resonance) frequency. Such dielectric mode frequencies, being a function of both permittivity and permeability, are magnetic field H tunable. Here, we report on below-FMR magnetodielectric resonance (MDR) axially magnetized barium hexaferrites and their H-tuning characteristics. Our studies reveal H-tuning by up to 2.5 GHz and the tuning is the largest when the ferrite is in a magnetically unsaturated state. A theory for the MDR is presented and a fairly good agreement between experimental data and theory has been obtained. Tunable millimeter wave phase shifters and isolators utilizing the below-FMR dielectric resonances have been demonstrated.
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