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1.
Вид документа
: Статья из журнала
Шифр издания
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Автор(ы)
: Aplesnin S. S., Udod L. V., Sitnikov M. N.
Заглавие
: Electronic transition, ferroelectric and thermoelectric properties of bismuth pyrostannate Bi2(Sn0.85Cr0.15)2O7
Место публикации
: Ceram. Int. - 2018. - Vol. 44, Is. 2. - P.1614-1620. - ISSN 02728842 (ISSN),
DOI
10.1016/j.ceramint.2017.10.082
Примечания
: Cited References: 41. - The authors would like to thank M. Molokeev for the clarification of x-ray spectra. 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 № 16–52-00045 bel_a.
Ключевые слова
(''Своб.индексиров.''): dielectric properties--ferroelectric properties--impedance--
thermopower
--electrical properties
Аннотация:
The ferroelectric properties of bismuth pyrostannate Bi2(Sn0.85Cr0.15)2O7 in the high-temperature region are established. The linear thermal expansion coefficient, electrical resistance, impedance, I−V characteristics, capacitance, loss-angle tangent, charge, and
thermopower
of the investigated material are measured in the temperature range of 300−700 K at frequencies of 102−106 Hz. Anomalies of the thermal expansion coefficient and hodograph spectrum variation in the region of polymorphic phase transitions are observed. The high resistance and change of the hopping conductivity for the tunnel-emission are found. The hysteresis in the electric field dependence of polarization is established. The change in the
thermopower
sign with temperature is revealed. The obtained experimental data are explained in the framework of the model of migration polarization by charged chromium ions.
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2.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Aplesnin S. S., Kharkov A., Sitnikov M.
Заглавие
: Regulation of the
thermopower
and ultrasound by magnetic field in manganese sulfide doped with variable-valence ions
Колич.характеристики
:11 с
Место публикации
: Eur. Phys. J. Plus. - 2024. - Vol. 139, Is. 3. - Ст.247. - ISSN 21905444 (eISSN),
DOI
10.1140/epjp/s13360-024-05032-2
Примечания
: Cited References: 50. - The study was supported by a grant from the Russian Science Foundation N 23-22-10016, the Krasnoyarsk Regional Science Foundation. The investigation of microstructural properties of the samples was carried out using equipment’s (SEM and TEM) the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS». The authors are grateful to A.V. Shabanov for the scanning electron microscopy investigations
Аннотация:
The effect of cation nonstoichiometry and variable-valence samarium ions on the thermoelectric and structural characteristics of manganese sulfide is studed. Nonstoichiometry leads to a change in the
thermopower
sign in the antiferromagnetic region in a magnetic field and a decrease in the
thermopower
in the paramagnetic region. It is shown that the
thermopower
and Nernst–Ettingshausen coefficient of samarium-substituted manganese sulfide change their signs in the vicinity of structural and electronic transitions established from the thermal expansion coefficient. A decrease in the sound attenuation in a magnetic field is found. A correlation between the temperatures of the change of the sign of the Nernst–Ettingshausen effect and the change in electrosound in a magnetic field is established and explained within the model of carrier diffusion in the phase transition region. The conductivity control by the ultrasound is demonstrated.
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3.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Aplesnin S. S., Udod L. V., Sitnikov M. N., Romanova O. B.
Заглавие
: Dielectric and transport properties, electric polarization at the sequential structural phase transitions in iron-substituted bismuth pyrostannate
Место публикации
: Ceram. Int. - 2021. - Vol. 47, Is. 2. - P.1704-1711. - ISSN 02728842 (ISSN),
DOI
10.1016/j.ceramint.2020.08.287
Примечания
: Cited References: 33. - The reported study was funded by Russian Foundation for Basic Research project № 20-52-00005 Bel_a
Аннотация:
The electrical characteristics including the electrical resistance, impedance, I–V characteristics, capacitance, dissipation factor, and thermoelectric power of the Bi2Sn2-хFeхO7 (х = 0.1, 0.2) stannates have been investigated in the temperature range of 100–600 K at frequencies of 102–106 Hz. The paramagnetic contribution of electrons to the dynamic magnetic susceptibility has been established. The conductivity mechanism of the compounds has been found from the I–V characteristics and the change in the carrier sign has been determined from the thermoelectric power. The hysteresis of the I–V curves, charge transfer currents and polarization current have been observed in the Bi2Sn1·8Fe0·2O7 compound. A nonlinear field dependence of the polarization in the orthorhombic phase has been found. The correlation between the obtained characteristics and the phase structure transitions has been established. Two relaxation channels and activation energy have been found using the Debye model. The hysteretic I–V characteristics have been explained using a model of the electronic structure and the dipole and migration polarization.
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4.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Dudnikov V. A., Orlov Yu. S., Fedorov A. S., Solovyov L., Vereshchagin S., Burkov A. T., Novikov S., Ovchinnikov S. G.
Заглавие
: Effect of oxygen nonstoichiometry on electrical conductivity and
thermopower
of Gd0.2Sr0.8FeO3-δ ferrite samples
Место публикации
: Materials. - 2019. - Vol. 12, Is. 1. - Ст.74. - ISSN 19961944 (ISSN),
DOI
10.3390/ma12010074
Примечания
: Cited References: 24
Аннотация:
The behavior of the resistivity and
thermopower
of the Gd0.2Sr0.8FeO3−δ ferrite samples with a perovskite structure and the sample stability in an inert gas atmosphere in the temperature range of 300–800 K have been examined. It has been established that, in the investigated temperature range, the thermoelectric properties in the heating‒cooling mode are stabilized at δ ≥ 0.21. It is shown that the temperature dependencies of the resistivity obtained at different δ values obey the activation law up to the temperatures corresponding to the intense oxygen removal from a sample. The semiconductor‒semiconductor electronic transitions accompanied by a decrease in the activation energy have been observed with increasing temperature. It is demonstrated that the maximum thermoelectric power factor of 0.1 µW/(cm·K2) corresponds to a temperature of T = 800 K.
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5.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Makovetskii G. I., Galyas A. I., Demidenko O. F., Yanushkevich K. I., Ryabinkina L. I., Romanova O. B.
Заглавие
: Electrical Conductivity and
Thermopower
in CoxMn1-xS Sulfides
Коллективы
:
Разночтения заглавия
:авие SCOPUS: Electrical conductivity and
thermopower
in Co xMn 1 - XS sulfides
Место публикации
: Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 50, Is. 10. - P1826-1829. - ISSN 1063-7834,
DOI
10.1134/S1063783408100065
Примечания
: Cited References: 6. - This study was supported by the Russian-Belarussian Foundation for Basic Research within the framework of the joint programs RFFI-BRFFI ( project no. RFFI-BRFFI 04-02-81018-Bel-2004a and project no. BRFFI-RFFIF04R-025).
Аннотация:
This paper reports on the results of investigations into the structural, electrical, and thermoelectrical properties of sulfides CoxMn1-xS (0 0), whereas the compound with x = 0.4 exhibits metallic conduction (alpha 0). It is found that the band gap E-g of the compounds under investigation varies in the range from 1.46 eV for alpha-MnS (x
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6.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Romanova O. B., Aplesnin S. S., Sitnikov M.N., Udod L. V., Shabanov A. V., Goncharov V.S., Zhivulko A.M., Yanushkevich K.I.
Заглавие
: Kondo effects in variable-valence manganese-substituted thulium selenide
Колич.характеристики
:7 с
Место публикации
: Ceram. Int. - 2024. - Vol. 50, Is. 18, Pt. B. - P.33555-33561. - ISSN 02728842 (ISSN),
DOI
10.1016/j.ceramint.2024.06.171. - ISSN 18733956 (eISSN)
Примечания
: Cited References: 31. - The authors would like to express their deepest gratitude to the researcher A.I. Galyas from Scientific-Practical Materials Research Center NAS, Minsk for the synthesis of samples MnXTm1-XSe
Аннотация:
The MnXTm1‒XSe (0 ≤ Х ≤ 0.2) solid solutions have been first synthesized and their structural, magnetic, and transport properties have been studied in the temperature range of 80–1000 K and magnetic fields of up to 12 kOe. The surface morphology of the samples has been examined and the chemical analysis has been carried out. It is shown that the valence change with the increasing substitution concentration is accompanied by a change in the lattice parameter and a decrease in the magnetic moment of the samples. The Kondo temperatures caused by the manganese and thulium subsystem have been found in the low- and room-temperature regions. The temperature of localization of small-radius polarons has been determined. A drastic decrease in the relaxation time in the range of the manganese ion percolation through the lattice in the MnXTm1‒XSe system has been established. The change of the current carrier type upon variation in the temperature and substitution concentration was determined from the Seebeck coefficient. A high-temperature extremum of
thermopower
was revealed, which is explained within the framework of the Anderson model.
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