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 Найдено в других БД:Каталог книг и брошюр библиотеки ИФ СО РАН (8)Каталог журналов библиотеки ИФ СО РАН (1)
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Общее количество найденных документов : 170
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1.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zhandun V. S., Zamkova N. G., Zinenko V. I.
Заглавие : The lattice dynamics, ferroelectric and antiferroelectric instability and ferroelectric phase transition in disorder solid solutions PbB’1/2B”1/2O3 (B’ = Ga, In, Lu; B” = Nb, Ta)
Коллективы : Russia/CIS/Baltic/Japan Symposium on Ferroelectricity
Место публикации : 9th Russai/CIS/Baltic/Japan symposium on ferroelectricity: abstracts book : June 15-19, 2008, Vilnius, Lithuania. - p.32
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2.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Flerov I. N.
Заглавие : Ferroelectric and ferroelastic phase transitions in some oxyfluorides A2AMOxF6-x with elpasolite-cryolite structure
Коллективы : Russia/CIS/Baltic/Japan Symposium on Ferroelectricity
Место публикации : 9th Russai/CIS/Baltic/Japan symposium on ferroelectricity: abstracts book : June 15-19, 2008, Vilnius, Lithuania. - p.113
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarev V. S., Mikhaleva E. A., Gorev M. V., Molokeev M. S., Bogdanov E. V., Cherepakhin A. V., Flerov I. N.
Заглавие : Phase transitions, baro- and piezocaloric effects in single crystal and ceramics of ferroelectric NH4HSeO4
Колич.характеристики :10 с
Место публикации : Solid State Sci. - 2024. - Vol. 148. - Ст.107440. - ISSN 12932558 (ISSN), DOI 10.1016/j.solidstatesciences.2024.107440. - ISSN 18733085 (eISSN)
Примечания : Cited References: 45. - The study was supported by the grant of the Russian Science Foundation No. 23-22-10014, Krasnoyarsk Regional Science Foundation, https://rscf.ru/en/project/23-22-10014/
Аннотация: A study of heat capacity, thermal dilatation and sensitivity to hydrostatic and uniaxial pressure was carried out on single-crystal and ceramic samples of NH4HSeO4. The main parameters of low-temperature successive phase transitions B2 (T1) ↔ incommensurate IC (T2) ↔ ferroelectric P1 (T3) ↔ non-ferroelectric did not depend on the type of samples. The behavior of the volumetric strain and the results of direct measurements of T3(p) contributed to the resolution of the longstanding problem associated with the ambiguity of the sign of the corresponding volumetric baric coefficient. The role of thermal expansion anisotropy in the formation of the piezocaloric effect (PCE) near the ferroelectric phase transition at T3 has been studied. Due to the strong difference in the linear baric coefficients, the main contribution to the barocaloric effect (BCE) comes from the inverse intensive and extensive PCE associated with the a-axis. Compared to a single crystal, ceramics demonstrate lower BCE values, which, however, exist in a wider temperature range, which leads to close values of integral caloric parameters. The strong decrease in both BCE and PCE at low-temperature transformations in NH4HSeO4 compared to the ferroelectrics NH4HSO4 and NH4NH4SO4 is associated with a small change in entropy during three low-temperature phase transitions, ΣΔSi = 2.52 J/mol∙K, which is a consequence of a high degree of structural ordering in selenate as a result of a high-temperature transformation at T0 between the superionic and B2 phases, accompanied by a giant change in entropy, ΔS0≈Rln21.
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Gorev M. V., Bondarev V. S., Molokeev M. S., Zaitsev A. I., Nemtsev I. V., Fokin A. V., Flerov I. N.
Заглавие : Heat capacity and thermal expansion of nanosized ferroelectric (NH4)2SO4 embedded in borosilicate glasses
Место публикации : J. Non-Cryst. Solids. - 2022. - Vol. 597. - Ст.121935. - ISSN 00223093 (ISSN), DOI 10.1016/j.jnoncrysol.2022.121935
Примечания : Cited References: 29. - The authors are grateful to Dr. Ewa Rysiakiewicz-Pasek (Wroclaw University of Science and Technology, Poland) for the preparation and characterization of borosilicate glasses. X-ray and dilatometric data were obtained using the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: The thermal properties of nanocomposites obtained by incorporating a ferroelectric (NH4)2SO4 (AS) into porous glasses (PG) was studied for the first time. X-ray diffraction studies showed a strong increase in the ratio of the size of nanocrystallites grown in glass matrices to pore size, dcryst/ dpore = 0.47→1.50→5.00, with a decrease in dpore = 320→46→7 nm. Calorimetric and dilatometric measurements showed a change from a first-order phase transition in AS single crystal to a second-order transformation in AS nanocrystallites. A restricted geometry also led to a significant decrease in the anomalous entropy in AS+PG samples compared to AS (J/mol∙K): 17.7 (AS)→12.4 (AS+PG320)→10.4 (AS+PG46)→8.1 (AS+PG7). A discussion of the nontrivial behavior of the phase transition temperature in embedded AS was carried out using the degree of PG filling, the ratio dcryst/dpore, texture, and the volumetric and linear baric coefficients for the bulk AS.
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5.

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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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fokina V. D., Bondarev V. S., Pogoreltsev E. I., Flerov I. N.
Заглавие : Efficiency of energy harvesting and storage using a multilayer capacitor based on BaTi0.86Sn0.14O3 ferroelectric lead-free ceramics
Место публикации : Ceram. Int. - 2022. - Vol. 48, Is. 22. - P.32966-32972. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2022.07.227
Примечания : Cited References: 45
Аннотация: The study of the parameters of energy harvesting and storage in the lead-free solid solution BaTi0.86Sn0.14O3 (BTSnO) was performed. The permittivity shows the behavior similar to a diffuse phase transition with the critical exponent γ = 1.84, which is close to the value characteristic of relaxors. Large values of the recoverable energy density, Wrec=(5.8–7.0)∙104 J/m3, and the energy storage efficiency coefficient, η=(82–94) %, are implemented in a wide temperature range, 30–87°С, at a low electric field, E = 18.5 kV/cm. For the first time, the analysis of the Olsen cycle was performed using two phase diagrams: polarization – electric field and entropy – temperature. A fairly good agreement was found between the values of the energy conversion density, ND ≈ 0.15 J/cm3, which was determined using two approaches. A universal parameter is proposed for comparing the energy harvesting density for the materials studied in different ranges of temperature and electric fields.
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7.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Prishchepa O. O., Krakhalev M. N., Rudyak V. Yu., Sutormin V. S., Zyryanov V. Ya.
Заглавие : Periodic structures of linear defects in cholesteric layer with conical-planar anchoring under electric field
Коллективы : "Polarity and Chirality in Soft Matter", International Conference on Ferroelectric Liquid Crystal
Место публикации : 18th International conference on ferroelectric liquid crystals: book of abstracts. - 2021. - Ст.O25
Примечания : Cited References: 4. - This work was supported by the Russian Science Foundation (No. 18-72-10036)
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8.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Gorev M. V., Bondarev V. S., Bogdanov E. V., Flerov I. N.
Заглавие : Comparative analysis of elastocaloric and barocaloric effects in single-crystal and ceramic ferroelectric (NH4)2SO4
Место публикации : Scripta Mater. - 2021. - Vol. 191. - P.149-154. - ISSN 13596462 (ISSN), DOI 10.1016/j.scriptamat.2020.09.030
Примечания : Cited References: 47. - The reported study was supported by the Russian Science Foundation (project no. 19-72-00023 ). X-ray and dilatometric data were obtained using the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: We report the influence of anisotropy and texture on elasto(ElCE)- and baro(BCE)-caloric effects in single-crystal and ceramic (NH4)2SO4. Inverse extensive and intensive ElCE in ceramics, (ΔSElCE)cer = 87 J/kg·K; ΔTAD = - 11.6 K), as well as in a single crystal along the ferroelectric axis a, (ΔSElCE)a = 115 J/kg·K; (ΔTAD)a = - 16 K, significantly exceed BCE, ΔSBCE = 75 J/kg·K; ΔTAD = - 9.8 K, even at low pressure ~ 0.3 GPa. Caloric parameters of ammonium sulphate are comparable with those for promising solid-state refrigerants.
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9.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Timofeev I. V., Bikbaev R. G., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Polarization rotation by cholesteric layers with tangential-conical boundary conditions
Коллективы : "Polarity and Chirality in Soft Matter", International Conference on Ferroelectric Liquid Crystal
Место публикации : 18th International conference on ferroelectric liquid crystals: book of abstracts. - 2021. - Ст.P18
Примечания : Cited References: 2. - This work was supported by the Russian Science Foundation (No. 18-72-10036)
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Gorev M. V., Bondarev I. A., Bogdanov E. V.
Заглавие : Features of the behavior of the barocaloric effect near ferroelectric phase transition close to the tricritical point
Место публикации : Crystals. - 2020. - Vol. 10, Is. 1. - Ст.51. - ISSN 2073-4352, DOI 10.3390/cryst10010051
Примечания : Cited References: 28. - The reported study was supported by the Russian Science Foundation (project no. 19-72-00023)
Аннотация: A detailed study of the effect of temperature and pressure on heat capacity, entropy and hysteresis phenomena near the ferroelectric phase transition in ammonium sulfate (AS) was performed. An analysis of experimental results within the framework of the phenomenological theory showed that taking into account the temperature-dependent part of the anomalous entropy leads to a significant increase in the barocaloric effect (BCE). The maximum values of extensive and intensive BCE near the tricritical point are outstanding: ΔSmaxBCE≈85 J/kgK, ΔTmaxAD≈12 K and can be achieved at low pressure ∼0.5 GPa.
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