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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisov V. M., Denisova L. T., Irtyugo L. A., Volkov N. V., Patrin G. S., Chumilina L. G.
Заглавие : High-temperature heat capacity of copper metaborate CuB2O4
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 10. - P.2142-2144. - ISSN 1063-7834, DOI 10.1134/S1063783412100113
Примечания : Cited References: 17
Предметные рубрики: SINGLE-CRYSTALS
MAGNETIC-PROPERTIES
SYSTEM
OXIDES
Аннотация: The heat capacity of copper metaborate CuB2O4 has been measured over a wide temperature range. A correlation between the composition of the CuO-B2O3 system and the heat capacity of the oxide compounds has been found.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisov V. M., Volkov N. V., Irtyugo L. A., Patrin G. S., Denisova L. T.
Заглавие : High-temperature heat capacity of the BiFeO3 multiferroic
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 6. - P.1312-1314. - ISSN 1063-7834, DOI 10.1134/S1063783412060108
Примечания : Cited References: 27
Предметные рубрики: STRUCTURAL-CHARACTERIZATION
SINGLE-CRYSTALS
FEATURES
SYSTEM
RANGE
Аннотация: Data on the heat capacity of the BiFeO3 multiferroic have been obtained within a broad temperature interval. Correlation has been established between the composition of the Bi2O3-Fe2O3 pseudobinary system and the specific heat capacity of the oxide compounds.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisov V. M., Irtyugo L. A., Denisova L. T., Patrin G. S., Volkov N. V.
Заглавие : Heat capacity and thermodynamic properties of GaFeO3 in the range 330-900 K
Место публикации : Inorg. Mater. - 2013. - Vol. 49, Is. 12. - P.1227-1228. - ISSN 0020-1685, DOI 10.1134/S0020168513120042
Примечания : Cited References: 10
Предметные рубрики: MULTIFERROIC GAFEO3
SINGLE-CRYSTALS
TEMPERATURE
BIFEO3
Аннотация: The heat capacity of multiferroic GaFeO3 has been measured in a wide temperature range and the results have been used to evaluate its thermodynamic functions (enthalpy increment and entropy change).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makarov I. A., Ovchinnikov S. G., Shneider E. I.
Заглавие : Dependence of the critical temperature of high-temperature cuprate superconductors on hoppings and spin correlations between CuO2 planes
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 114, Is. 2. - P.329-342. - ISSN 1063-7761, DOI 10.1134/S1063776112020264
Примечания : Cited References: 73. - This study was supported in part by the Presidium of the Russian Academy of Sciences (program "Quantum Physics of Condensed Media," project no. 18.7), jointly by the Siberian and Ural branches of the Russian Academy of Sciences (integration projects project no. 40), the Russian Foundation for Basic Research (project no. 09-02-00127), the Presidential Program in Support of Young Scientists in Russia (project no. MK-1683.2010.2), and the federal target program "Specialists" (project no. P891). One of the authors (E.I.Sh.) gratefully acknowledges support from the nonprofit Dynasty foundation.
Предметные рубрики: T-J MODEL
BAND HUBBARD-MODEL
SINGLE-CRYSTALS
TRANSITION-TEMPERATURE
FERMI-SURFACE
DOPING DEPENDENCE
THERMAL-EXPANSION
COPPER OXIDES
ANISOTROPY
LA2-XSRXCUO4
Аннотация: The influence of interlayer hoppings on the superconducting transition temperature (T c) in bilayer cuprates has been studied. The parameter of hopping between layers is expressed as t ⊥(k) = t ⊥(cos(k x ) − cos(k y ))2 and treated as a small perturbation for the states of two CuO2 planes described by the t-t′-t″-J* model. In the generalized mean field approximation for dx2−y2{d_{{x. } - {y. }}} symmetry of the superconducting gap, neither the interlayer hopping or exchange interaction, nor the pair hopping between CuO2 layers provides an additional mechanism of Cooper pair formation or an increase in T c. In the concentration dependence of T c, the bilayer splitting of the upper Hubbard band of quasi-holes is manifested as two peaks with temperatures slightly lower than the maximum T c for a single-layer cuprate. Interlayer antiferromagnetic spin correlations suppress bilayer splitting.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Gorev M. V., Molokeev M. S., Cherepakhin A. V., Kartashev A. V., Mikhashenok N. V., Sablina K. A.
Заглавие : Caloric characteristics of PbTiO3 in the temperature range of the ferroelectric phase transition
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 9. - P.1832-1840. - ISSN 1063-7834, DOI 10.1134/S1063783412090181
Примечания : Cited References: 31. - This study was supported by the Russian Foundation for Basic Research (project no. 12-08-00079) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4828.2012.2).
Предметные рубрики: SINGLE-CRYSTALS
LEAD TITANATE
DIELECTRIC PROPERTIES
SOLID-SOLUTIONS
PRESSURE
PEROVSKITES
DEPENDENCE
BEHAVIOR
HEAT
Аннотация: The heat capacity and thermal expansion of the PbTiO3 ceramic sample have been measured in the temperature range 80–970 K. The electrocaloric and barocaloric efficiencies of lead titanate in the ferroelectric phase transition range have been investigated by analyzing the experimental data in terms of the thermodynamic theory of phase transitions, the electrical equation of state P(T, E), the Pippard equation, and the S(T, p) diagram.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moiseev N. V., Popov P. A., Solomennik V. D., Zaitsev A. I., Cherepakhin A. V.
Заглавие : Heat capacity and thermodynamic properties of crystalline SrB4O7
Место публикации : Inorg. Mater.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 48, Is. 5. - P.504-507. - ISSN 0020-1685, DOI 10.1134/S0020168512050123
Примечания : Cited References: 24. - This work was supported in part by the RF President's Grants Council (grant no. NSh-4645.2010.2), the RF Ministry of Education and Science (analytical departmental targeted program Development of the Scientific Potential of Higher Education Institutions, grant no. RNP 2.1.1/10747), Bryansk State University (project no. 1.1.11), and the Physical Sciences Division of the Russian Academy of Sciences (Physics of Advanced Materials and Structures Program, project no. 2.5.2).
Предметные рубрики: STRONTIUM TETRABORATE
SINGLE-CRYSTALS
LUMINESCENCE
Аннотация: The heat capacity of a strontium tetraborate (SrB4O7) single crystal has been determined in the temperature range 55-300 K by adiabatic calorimetry, and its Debye characteristic temperature, entropy change, enthalpy increment, and phonon mean free path have been calculated as functions of temperature.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisov V. M., Denisova L. T., Gudim, I. A., Temerov V. L., Volkov N. V., Patrin G. S., Chumilina L. G.
Заглавие : High-temperature heat capacity of YFe3(BO3)4
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 56, Is. 2. - P.276-278. - ISSN 1063-7834, DOI 10.1134/S1063783414020085. - ISSN 1090-6460
Примечания : Cited References: 21
Предметные рубрики: SINGLE-CRYSTALS
Аннотация: The molar heat capacity of YFe3(BO3)4 has been measured using differential scanning calorimetry in the temperature range 339–1086 K. It has been found that the dependence C p = f(T) exhibits an extremum at a temperature of 401 K due to the structural transition.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zinenko V. I., Pavlovskii M. S., Krylov A. S., Gudim, I. A., Eremin E. V.
Заглавие : Vibrational spectra and elastic, piezoelectric, and magnetoelectric properties of HoFe3(BO3)(4) and HoAl3(BO3)(4) crystals
Коллективы : Russian Federation under the program "Leading Scientific Schools" [NSh 4828.12.2]; Russian Foundation for Basic Research [12-02-00025-a]; Ministry of Education and Science of the Russian Federation [8365]
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2013. - Vol. 117, Is. 6. - P.1032-1041. - ISSN 1063-7761, DOI 10.1134/S1063776113140203. - ISSN 1090-6509
Примечания : Cited References: 17. - This study was supported financially by the President of the Russian Federation under the program "Leading Scientific Schools" (grant no. NSh 4828.12.2), the Russian Foundation for Basic Research (project no. 12-02-00025-a), and the Ministry of Education and Science of the Russian Federation (contract no. 8365).
Предметные рубрики: MAGNETOELASTIC PROPERTIES
SINGLE-CRYSTALS
FERROBORATE
Аннотация: Raman spectra of light are obtained for HoFe3(BO3)(4) and HoAl3(BO3)(4) crystals at various temperatures and are used for determining the frequencies of crystal lattice vibrations at the center of the Brillouin zone. It is also found that the HoFe3(BO3)(4) crystal exhibits a phase transition at T (c) a parts per thousand 366 K. The magnetoelectric effect in the paramagnetic phase of these compounds is studied experimentally. The lattice vibration frequencies, elastic and piezoelectric moduli, Born dynamic charges, and the high-frequency permittivity are calculated using the density functional method. A peculiar behavior of the transverse acoustic vibration branch is observed in the I" - Z direction of the Brillouin zone of the HoFe3(BO3)(4) crystal. The electric polarization induced by an external field is estimated using the calculated values of piezoelectric moduli and experimental values of magnetostriction.Спектры КР света получены для HoFe3 (BO3) 4 и HoAl3 (BO3) 4 кристаллы при различных температурах и используются для определения частоты колебаний кристаллической решетки в центре зоны Бриллюэна. Также обнаружено, что HoFe3 (BO3) 4 демонстрирует фазовый переход при Tc ≈ 366 К. Магнитоэлектрический эффект в парамагнитной фазе этих соединений экспериментально исследован. Частоты колебаний решетки, упругие и пьезоэлектрические модули, Борновские динамические заряды, и высокочастотная проницаемость рассчитываются с использованием метода функционала плотности. Своеобразное поведение поперечной ветви акустических колебаний наблюдается в направлении Γ Z зоны Бриллюэна в HoFe3 (BO3) 4.Электрическая поляризация индуцированная внешним полем оценивается с помощью расчетные значения пьезомодулей и экспериментальных значений магнитострикции.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sokolov A. E., Edelman I. S., Zabluda V. N., Petrakovskaya E. A., Aleksandrovsky A. S., Shubin A. A., Trukhan S. N., Mart'yanov O. N.
Заглавие : Magneto-optical activity of crude oil and its heavy fractions
Место публикации : Opt. Spectrosc.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 112, Is. 5. - P.755-762. - ISSN 0030-400X, DOI 10.1134/S0030400X12050165
Примечания : Cited References: 18. - This work was performed under Interdisciplinary Integration Project no. 118 of the Siberian Branch of the Russian Academy of Sciences (2009-2011).
Предметные рубрики: MAGNETIC CIRCULAR-DICHROISM
SINGLE-CRYSTALS
SPECTROSCOPY
EPR
ABSORBENCY
PORPHYRIN
SYSTEMS
Аннотация: We have experimentally studied optical and magneto-optical spectra of solutions of crude oils of different origin and their heavy fractions in the visible spectral range. Magnetic circular dichroism of oil in the wavelength range similar to 550 nm has been revealed. We show that the shape of the spectra of this dichroism depends on the origin of crude oil, with the magnetic dichroism magnitude being proportional to the concentration of the oil in the solution. A comparison of the data of magneto-optical spectroscopy with electron paramagnetic resonance spectra and chemical composition of samples has allowed us to conclude that the observed magneto-optical activity is determined by the occurrence of VO2+ complexes in the oil samples. The revealed magneto-optical activity of crude oil can form the basis of a unique method of analysis of the composition and properties of oils of different origin and heavy fractions thereof.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Bondarev V. S., Raevskaya S. I., Ivliev M. P., Raevskii I. P., Flerov I. N.
Заглавие : Studies of the heat capacity and thermal expansion of the Na0.95K0.05NbO3 solid solution
Коллективы : Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation [NSh-4828.2012.2]; Russian Foundation for Basic Research [12-02-31799 mol_a]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 56, Is. 2. - P.367-372. - ISSN 1063-7834, DOI 10.1134/S1063783414020115. - ISSN 1090-6460
Примечания : Cited References: 27. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4828.2012.2) and the Russian Foundation for Basic Research (project no. 12-02-31799 mol_a).
Предметные рубрики: SODIUM NIOBATE
PHASE-TRANSITIONS
TEMPERATURE-RANGE
SINGLE-CRYSTALS
KNBO3
FERROELECTRICS
DIFFRACTION
OCTAHEDRA
Аннотация: The heat capacity and thermal expansion of ceramic samples of the Na0.95K0.05NbO3 solid solution have been investigated over a wide temperature range of 100-750 K. The observed anomalies in the heat capacity and thermal expansion at T (4) = 297 K, T (3) = 535 K, T (2) = 665 K, and T (1) a parts per thousand 710 K correspond to the sequences of phase transitions N - Q - G - S - T1. It has been shown that, as a result of the phase transitions, the unit cell volume at T (4) and T (2) decreases, and at T (3) and T (1), increases with increasing temperature. The directions of the shift of the phase transition temperatures induced by hydrostatic pressure have been determined. It has been established that all structural transformations are accompanied by relatively small variations in the entropy. Different mechanisms of the structural distortions have been discussed.
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