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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Habibullayev N. N., Burkov A. T., Novikov S. V., Yurev I. O., Aleksandrovskiy A. S., Zakharova A. D., Shulaev N. A., Denisenko Yu. G., Andreev O. V.
Заглавие : Regularity of thermal characteristics, thermoelectric properties of EuLnCuSe3 compounds (Ln = La–Lu)
Колич.характеристики :12 с
Место публикации : Eur. Phys. J. Plus. - 2024. - Vol. 139, Is. 5. - Ст.412. - ISSN 21905444 (eISSN), DOI 10.1140/epjp/s13360-024-05155-6
Примечания : Cited References: 53. - This study was funded by the Russian Science Foundation (project No. 23-23-00488 "Search for EMF generation conditions in gradient ceramics of samarium monosulfide (SmS)"). A.S.A is grateful for the state assignment funding from Kirensky Institute of Physics
Аннотация: The temperatures and enthalpies of the decomposition of EuLnCuSe3 compounds (Ln = La–Lu) are determined for the first time as functions of the Ln3+ ionic radius (rLn3+). The EuLnCuSe3 compounds with Ln = La and Ce decompose in the course of a solid-phase reaction to form EuSe, Ln2Se3, and Cu2−xSe, whereas those with Ln = Tb, Dy, Ho, Tm, and Lu melt incongruently to form EuSe and a melt, for example, Tdecay = 1175 K and ΔHdecay = 2.66 kJ/mol for EuLaCuSe3, while Tmelt = 1576 K and ΔHmelt = 2.69 kJ/mol for EuTbCuSe3. When plotted as functions of rLn3+, the temperatures of thermal effects of these compounds exhibit a periodic dependence and a tetrad effect. The temperature dependence of electrical resistivity and that of the Seebeck coefficient are measured from 300 to 600 K. It is shown that the studied compounds are p-type semiconductors with bandgaps ranging from 0.4 to ~ 1 eV.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Orlov Yu. S., Solovyov L. A., Vereshchagin S. N., Ustyuzhanin Yu. N., Zharkov S. M., Zeer G. M., Borus A. A., Bondarev V. S., Ovchinnikov S. G.
Заглавие : Crystal structure and thermoelectric properties of mechanically activated LaCoO3
Место публикации : J. Taiwan Inst. Chem. Eng. - 2024. - Vol. 162. - Ст.105560. - ISSN 18761070 (ISSN), DOI 10.1016/j.jtice.2024.105560. - ISSN 18761089 (eISSN)
Примечания : Cited References: 88. - This study was supported by the Russian Science Foundation , project no. 24-22-00091
Аннотация: Background: Crystal structure of rare-earth LaCoO3 cobalt oxide subjected to high energy mechanical activation has been studied. In the temperature range of 300–800 K, the electrical conductivity and Seebeck coefficient were measured. Thermal conductivity was measured at 300–480 K. Methods: Comparative analysis of thermoelectric properties of the samples prepared by standard solid-state reaction and using high-energy mechanical activation was carried out. Findings: It was found that the experimental X-ray diffraction patterns are best described within the model that allows the coexistence of two domains in samples with the same crystal symmetry, but different lattice a and c parameters. The percentage ratio of these domains in the samples depends significantly on the size of the initial particles in the solid-state synthesis reaction and the annealing temperature. Mechanical activation and increase of synthesis temperature result in change of Seebeck coefficient sign and significant decrease of electrical resistivity. The Seebeck coefficient of non-activated samples takes positive values over the entire temperature range and decreases monotonically with increasing temperature, in contrast to mechanically activated samples exhibiting ambipolar behavior.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Udod L. V., Aplesnin S. S., Sitnikov M. N., Romanova O. B.
Заглавие : Investigation of the magnetoelectric effect and thermoelectric power of the composite of iron-substituted bismuth pyrostannate Bi2(Sn0.7Fe0.3)2O7/Bi2Fe4O9
Колич.характеристики :7 с
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 8. - P.1305-1311. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.08.56576.83. - ISSN 10906460 (eISSN)
Примечания : Cited References: 45
Аннотация: The composite compound Bi2(Sn0.7Fe0.3)2O7/Bi2Fe4O9 in the ratio 91/9% was synthesized by the solid-phase reaction method. The current-voltage characteristics were studied in the temperature range 800–400 K. The hysteresis of the current-voltage characteristics was found. The magnetoelectric interaction and thermoelectric power have been studied. The temperatures of predominance of the even and linear functions of the magnetoelectric effect are established. The sign change of the thermopower has been found.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Vereshchagin S. N., Solovyov L. A., Borus A. A., Volochaev M. N., Nikitin A. V., Bushinsky M. V., Lanovsky R. A., Rymski G. S., Dudnikov V. A.
Заглавие : Stability and thermoelectric properties of mechano-activated solid solutions of Sr1-xLnxTiO3-δ (Ln = Nd, Gd, Dy)
Место публикации : J. Taiwan Inst. Chem. Eng. - 2022. - Vol. 138. - Ст.104449. - ISSN 18761070 (ISSN), DOI 10.1016/j.jtice.2022.104449
Примечания : Cited References: 39. - This study was supported by the Russian Foundation for Basic Research, project no. 20-52-04008 Bel_mol_a. Thermal analysis was performed within the scope of Budget Project No. 0287-2021-00-13 for the Institute of Chemistry and Chemical Technology SB RAS
Аннотация: Background: The effect of mechanochemical activation on the microstructure, morphology, and thermoelectric parameters of the materials leading to an increase in the power factor (PF) is demonstrated by the example of the Sr1-xLnxTiO3-δ (Ln = Nd, Gd, Dy; x = 0.05, 0.075, 0.1) solid solutions. Methods: The strontium titanate solid solutions have been synthesized using a conventional ceramic technology from particles of different sizes obtained by mechanical activation of annealed ceramics. Findings: It is shown that different sizes of initial particles cause the morphological and microstructural differences and significantly affect the stability and thermoelectric properties of the synthesized samples. It has been established that a decrease in the initial particle size ensures the thermal stability of the samples and leads to an increase in their electrical conductivity and PF at the minor variation in the Seebeck coefficient. The PF of the Sr0.925Nd0.075TiO3 solid solution changes by a factor of 7. It has been found that the mechanically activated samples have the much lower porosity than the nonactivated ones, which noticeably reduces the effective area of their interaction with the environment (oxygen release and absorption); therefore, all the measurement data obtained on the mechanically activated samples upon their heating and cooling are reversible.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grigoriev, Maxim V., Solovyov, Leonid A., Ruseikina, Anna V., Aleksandrovsky A. S., Chernyshev, Vladimir A., Velikanov D. A., Garmonov, Alexander A., Molokeev M. S., Oreshonkov A. S., Shestakov N. P., Matigorov, Alexey V., Volkova, Svetlana S., Ostapchuk, Evgeniy A., Kertman, Alexander V., Schleid, Thomas, Safin, Damir A.
Заглавие : Quaternary selenides EuLnCuSe3: Synthesis, structures, properties and in silico studies
Место публикации : Int. J. Mol. Sci. - 2022. - Vol. 23, Is. 3. - Ст.1503. - ISSN 1422-0067(eISSN), DOI 10.3390/ijms23031503
Примечания : Cited References: 90
Предметные рубрики: RARE-EARTH
CRYSTAL-STRUCTURES
MAGNETIC-PROPERTIES
THERMOELECTRIC PERFORMANCE
Аннотация: In this work, we report on the synthesis, in-depth crystal structure studies as well as optical and magnetic properties of newly synthesized heterometallic quaternary selenides of the Eu+2Ln+3Cu+1Se3 composition. Crystal structures of the obtained compounds were refined by the derivative difference minimization (DDM) method from the powder X-ray diffraction data. The structures are found to belong to orthorhombic space groups Pnma (structure type Ba2MnS3 for EuLaCuSe3 and structure type Eu2CuS3 for EuLnCuSe3, where Ln = Sm, Gd, Tb, Dy, Ho and Y) and Cmcm (structure type KZrCuS3 for EuLnCuSe3, where Ln = Tm, Yb and Lu). Space groups Pnma and Cmcm were delimited based on the tolerance factor t’, and vibrational spectroscopy additionally confirmed the formation of three structural types. With a decrease in the ionic radius of Ln3+ in the reported structures, the distortion of the (LnCuSe3) layers decreases, and a gradual formation of the more symmetric structure occurs in the sequence Ba2MnS3 → Eu2CuS3 → KZrCuS3. According to magnetic studies, compounds EuLnCuSe3 (Ln = Tb, Dy, Ho and Tm) each exhibit ferrimagnetic properties with transition temperatures ranging from 4.7 to 6.3 K. A negative magnetization effect is observed for compound EuHoCuSe3 at temperatures below 4.8 K. The magnetic properties of the discussed selenides and isostructural sulfides were compared. The direct optical band gaps for EuLnCuSe3, subtracted from the corresponding diffuse reflectance spectra, were found to be 1.87–2.09 eV. Deviation between experimental and calculated band gaps is ascribed to lower d states of Eu2+ in the crystal field of EuLnCuSe3, while anomalous narrowing of the band gap of EuYbCuSe3 is explained by the low-lying charge-transfer state. Ab initio calculations of the crystal structures, elastic properties and phonon spectra of the reported compounds were performed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zavjalov A. P., Lyubas G. A., Sharafutdinov M. R., Tarasov I. A., Belov A. A., Shichalin O. O., Papynov E. K., Kriventsov V. V., Kosyanov D. Y.
Заглавие : Fabrication and thermoelectric properties of SrTiO3–TiO2 composite ceramics
Место публикации : Ceram. Int. - 2022. - Vol. 48, Is. 24. - P.36500-36514. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2022.08.210. - ISSN 18733956 (eISSN)
Примечания : Cited References: 55. - This work was supported by the Russian Foundation for Basic Research (Project No. 18-29-11044). A.P.Z. appreciate the support from the Ministry of Science and Higher Education of the Russian Federation within the governmental order for the Institute of Solid State Chemistry and Mechanochemistry of SB RAS (project No. FWUS-2021-0004). D.Yu.K. is grateful to the Council on grants of the President of the Russian Federation (scholarship No. SP-3221.2022.1) for supporting the studies devoted to obtaining advanced ceramic materials. A.A.B. O.O.Sh. and E.K.P. grateful to the State Assignment of the Ministry of Science and Higher Education of the Russian Federation (topic No. 00657-2020-0006) for supporting the SEM images obtaining. The work was partially done at the shared research center SSTRC on the basis of the VEPP-4–VEPP-2000 complex at Budker Institute of Nuclear Physics of Siberian Branch of Russian Academy of Sciences
Аннотация: The paper presents the results of preparing biphase SrTiO3–TiO2 ceramics as a promising system for n-type thermoelectrics using the features of a two-dimensional electron gas. Ceramics was obtained by reactive spark plasma sintering of SrCO3 and TiO2. The dynamics of phase transformations are shown; it is clarified that phase transformations are not the driving force of sintering. The mutual stabilization of the SrTiO3 and TiO2 phases is shown. Unique data on the assessment of the temperature gradient in the system have been obtained. A comparison of the thermoelectric characteristics of biphasic ceramics and its constituent phases allows concluding that the role of the two-dimensional electron gas is reduced to modulating the properties of bulk phases. Clear signs of size quantization were detected by the X-ray luminescence method, which is expressed in the blueshift of the luminescence spectrum by 22.3 ± 0.8 meV.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Cheng Y., Yang J., Luo Y., Li W., Vtyurin A. N., Jiang Q., Dunn S., Yan H.
Заглавие : Enhancement of thermoelectric performance in Bi0.5Sb1.5Te3 particulate composites including ferroelectric BaTiO3 nanodots
Место публикации : ACS Appl. Mater. Interfaces. - 2022. - Vol. 14, Is. 32. - P.37204-37212. - ISSN 19448244 (ISSN), DOI 10.1021/acsami.2c10424
Примечания : Cited References: 40. - This work was supported by the National Natural Science Foundation of China (51772019, 51572098, and 51632006) and the NSFC-Royal Society joint project (51811530307 and IEC\NSFC\170290)
Аннотация: An increasing number of studies have reported producing composite structures by combining thermoelectric and functional materials. However, combining energy filtering and ferroelectric polarization to enhance the dimensionless figure of merit thermoelectric ZT remains elusive. Here we report a composite that contains nanostructured BaTiO3 embedded in a Bi0.5Sb1.5Te3 matrix. We show that ferroelectric BaTiO3 particles are evenly composited with Bi0.5Sb1.5Te3 grains reducing the concentration of free charge carriers with increasing BaTiO3 content. Additionally, as a result of the energy-filtering effect and ferroelectric polarization, the Seebeck coefficient was improved by ∼10% with a ∼10% improvement in power factors. The BaTiO3 phase can effectively scatters phonons reducing lattice thermal conductivity κl (0.5 W m–1 K–1) and increasing ZT to 1.31 at 363 K in Bi0.5Sb1.5Te3 composites with 2 vol % BaTiO3 content giving an improvement of ∼25% over pure Bi0.5Sb1.5Te3. Our work indicates that the introduction of ferroelectric nanoparticles is an effective method for optimizing the ZT of Bi0.5Sb1.5Te3-based thermoelectric materials.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Orlov Yu. S., Solovyov L. A., Vereshchagin S. N., Gavrilkin S. Y.
Заглавие : The Sr2.4Dy0.6Co2O7-δ Ruddlesden‒Popper Phase: Structural, thermoelectric, and magnetic properties
Место публикации : Ceram. Int. - 2021. - Vol. 47, Is. 7, Part A. - P.9068-9074. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2020.12.030
Примечания : Cited References: 39. - The study was supported by the Russian Foundation for Basic Research , project no. 19-03-00017 and the budget project #АААА-А17-117021310222-4 for the Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences
Аннотация: A new anion-deficient Sr2.4Dy0.6Co2O7‒δ (δ = 0.33–1.1) perovskite phase with a structure of the A3B2O7 Raddlesden‒Popper homologous series has been obtained by the solid-state synthesis in the reducing/oxidizing atmosphere and its structural characterization has been performed by the Rietveld refinement of the X-ray powder diffraction data. It has been stablished that the Sr2.4Dy0.6Co2O7‒δ compound (sp. gr. I4/mmm) has parameters of a = b = 3.8526(1) and c = 19.9431(7) Å in the reduced form (δ = 1.1) and a = b = 3.8086(1) and c = 19.9190(6) Å in the oxidized form (δ ≈ 0.33) and oxygen vacancies occupy mainly the sites linking CoO5 polyhedra inside two perovskite layers. It has been established using differential scanning calorimetry and thermogravimetry that, at T 530 K, the synthesized phase is stable against the inert and oxidizing atmosphere; at higher temperatures, the Sr2.4Dy0.6Co2O7-δ compound can reversibly absorb/release oxygen. The magnetic properties of the Sr2.4Dy0.6Co2O6.09 compound have been investigated in the temperature range of 10–400 K and described in terms of the formation of dimers, in which the Co3+‒Co3+ and Co2+‒Co2+ ion pairs antiferromagnetically interact and are in the nonmagnetic ground state. The electrical conductivity and the Seebeck coefficient have been measured in air in the temperature range from 300 to 800 K. An observed sharp decrease in the Seebeck coefficient of the Sr2.4Dy0.6Co2O7-δ compound and the change in its sign near 700 K have been attributed to the transition of cobalt ions to the Co3+ state and the charge disproportionation of Co3+ ions to Co2+ and Co4+ ones.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Vereshchagin S. N., Novikov, S., V, Burkov A. T., Borus A. A., Sitnikov, M., V, Solovyov L. A., Volochaev M. N., Dudnikov V. A.
Заглавие : Effect of mechanical activation on the thermoelectric properties of Sr1-xSmxTiO3 ceramics
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-72-00097]
Место публикации : Ceram. Int. - 2021. - Vol. 47, Is. 20. - P.28992-28999. - ISSN 0272-8842, DOI 10.1016/j.ceramint.2021.07.060. - ISSN 1873-3956(eISSN)
Примечания : Cited References: 31. - This study was supported by the Russian Science Foundation, project no. 19-72-00097
Предметные рубрики: SRTIO3
LA
MICROSTRUCTURE
CONDUCTIVITY
PERFORMANCE
FIGURE
MERIT
Аннотация: The Sr1-xSmxTiO3 (х = 0.025, 0.05, 0.075, 0.1, 0.2) strontium titanate solid solutions were prepared from oxides and carbonates using a conventional ceramic technology based on the mechanochemical activation. The electrical conductivity and Seebeck coefficient of the synthesized compounds were measured in the temperature range from 300 to 800 K. We found that the properties of the samples significantly depend on the preliminary mechanochemical activation. The thermoelectric power factor attains maximum value in the hydrogen reduced samples with concentration of х = 0.05 and 0.075 obtained from nanoparticles: 5.5 μW/(cm · K2) for Sr0.95Sm0.05TiO3 (580 K) and 4.10 μW/(cm · K2) for Sr0.925Sm0.075TiO3 (650 K). An increase in the annealing temperature of mechanically activated samples leads to an even greater increase in electrical conductivity and power factor: 9.2 μW/(cm · K2) for Sr0.925Sm0.075TiO3 (650 K).
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10.

Вид документа : Статья из журнала
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Автор(ы) : Tambasov I. A., Voronin A. S., Evsevskaya N. P., Kuznetsov, Yu M., Luk'yanenko A. V., Tambasova E. V., Gornakov M. O., Dorokhin, M., V, Loginov, Yu Yu
Заглавие : Experimental study of the thermal conductivity of single-walled carbon nanotube-based thin films
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk Territory; Krasnoyarsk Territorial Foundation for Support of Scientific and RD Activity [18-42-243010]; Russian FederationRussian Federation [SP-2235.2019.1]
Место публикации : Phys. Solid State. - 2020. - Vol. 62, Is. 6. - P.1090-1094. - ISSN 1063-7834, DOI 10.1134/S1063783420060311. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 21. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project Study of the Thermal Conductivity and Structural Features in Nanostructured Oxide Thin Films Promising for Thermoelectric Applications no. 18-42-243010 and the Scholarships of the President of the Russian Federation (SP-2235.2019.1).
Предметные рубрики: THERMOELECTRIC PROPERTIES
TRANSPORT-PROPERTIES
Аннотация: The single-walled carbon nanotube-based thin films with a thickness from 11 ± 3 to 157 ± 18 nm have been formed using vacuum filtration. The thermal conductivity of the thin films as a function of thickness and temperature up to 450 K has been studied by the 3ω technique. It has been found that, in the region of 49 nm, the supplied heat from a gold strip started propagating with the high efficiency to the thin film plane. The thermal conductivity of the thin films with a thickness of 49 ± 8 nm was measured using the 3ω technique for bulk samples. It has been found that the thermal conductivity of the single-walled carbon nanotube-based thin films strongly depends on their thickness and temperature. The thermal conductivity sharply (by a factor of ~60) increases with an increase in thickness from 11 ± 3 to 65 ± 4 nm. In addition, it has been observed that the thermal conductivity of the thin film with a thickness of 157 ± 18 nm rapidly decreases from 211 ± 11 to 27.5 ± 1.4 W m–1 K–1 at 300 and 450 K, respectively.
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