On lead-scandium tantalate solid solutions with high electrocaloric effect

Shebanov, L. A.; Borman, K.

doi:10.1080/00150199208223361

Cited by 55 publications

(17 citation statements)

References 3 publications

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“…Therefore, we assume that it has another origin, namely a relaxor character of compositions with x ≤ 0.37. A nonlinear EC response is typical for relaxor materials, where it is manifested in a broad maximum above the transition temperature, which becomes intensive for high fields . Shi and Soh proposed that an enhancement of the EC effect above the Curie temperature is due to a decreased dielectric stiffness and polarization correlation length in the relaxor state …”

Section: Discussionmentioning

confidence: 99%

“…A nonlinear EC response is typical for relaxor materials, where it is manifested in a broad maximum above the transition temperature, which becomes intensive for high fields. 8,9,38,39 Shi and Soh proposed that an enhancement of the EC effect above the Curie temperature is due to a decreased dielectric stiffness and polarization correlation length in the relaxor state. 40 It was shown that the studied BCT-BZT materials also manifest a relaxor behavior.…”

Section: Discussionmentioning

confidence: 99%

“…5,6 Bulk materials are of particular interest due to their large cooling capacity that is mandatory for applications. In particular, a large EC effect has been reported for some lead-based ferroelectrics, such as Pb 0.88 La 0.08 Zr 0.65 Ti 0.35 O 3 (PLZT), 7 PbSc 1/2 Ta 1/2 O 3 (PST), 8 Pb (Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 (PZN-PT), 9 PbMg 1/3 Nb 2/3 O 3 (PMN), 10 and (1Àx)Pb(Mg 1/3 Nb 2/3 )O 3 -(x)PbTiO 3 (PMN-PT), [11][12][13] for instance in PMN bulk ceramics, a DT EC~2 .5 K has been obtained. Although encouraging results have been obtained, the lead content in these materials is a serious limitation for their technological transfer into industrial applications.…”

Section: Introductionmentioning

confidence: 99%

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Electrocaloric Effect in Ba(Zr,Ti)O₃–(Ba,Ca)TiO₃ Ceramics Measured Directly

et al. 2016

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In this paper, we report on studies of the electrocaloric (EC) effect in lead‐free (1−x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 ceramics with compositions range between 0.32 ≤ x ≤ 0.45. The EC effect was measured directly using a modified differential scanning calorimeter. The maximum EC temperature change, ΔTdirect = 0.33 K under an electric field of 2 kV/mm, was observed for the composition with x = 0.32 at ~63°C. We found that the EC effect peaks not only around the Curie temperature but also at the transition between the ferroelectric phases with different symmetries. A strong discrepancy observed between the results of the direct measurements and indirect estimations points out that using Maxwell's equations is invalid for the thermodynamic nonequilibrium conditions that accompany only partial (incomplete) poling of ceramics. We also observe a nonlinearity of the EC effect above the Curie temperature and in the temperature range corresponding to the tetragonal ferroelectric phase.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrocaloric Effect in Ba(Zr,Ti)O₃–(Ba,Ca)TiO₃ Ceramics Measured Directly

et al. 2016

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“…The EC effect is the thermodynamically reverse process of pyroelectric effect due to Maxwell relationship. Thus many pyroelectrics can also be good EC materials for solid-state refrigeration, such as PZT, Ba x Sr 1-x TiO 3 (BST) and PbSc 1/2 Ta 1/2 O 3 (PScT) [5,[8][9][10][11] . Much attention has been especially paid on BST and PScT for its large pyroelectric effect near the room temperature [5,8,[10][11] .…”

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confidence: 99%

Electrocaloric Effect in Pb0.3CaxSr0.7-xTiO3 Ceramics Near Room Temperature

Han¹,

Guo²,

Yan³

et al. 2019

Journal of Inorganic Materials

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The electrocaloric (EC) effect is strongly related to interaction of polarization and temperature changes, showing great potential in high-efficient solid state refrigeration. This work focuses on the Pb 0.3 Ca x Sr 0.7-x TiO 3 (PCST(x), x = 0.00, 0.05, 0.10, 0.15) ceramics in which the influence of Ca content on dielectric and ferroelectric property under electric field was studied, and the EC temperature change was calculated through indirect method. Substitution of Ca largely modifies the diffused phase transition behaviors of PCST ceramics, which the diffusion exponent of PCST(0.05) increases with electric field up, indicating a promising wide temperature range of large electrocaloric effect. Thus, the largest adiabatic temperature change (1.71 K) is obtained near the room temperature in PCST(0.05) by indirect method. With an electric field of 8 kV/mm, PCST(0.05) ceramic shows good EC effect in a wide temperature range that the adiabatic temperature change is larger than 1 K from 5 ℃ to 70 ℃.

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“…The purpose of this is twofold: to propose a strategy to increase the magnitude of the ECE and to model the ECE of so-called relaxor ferroelectrics -a widely studied class of electrocaloric materials with diffuse phase transitions that could provide a broad temperature range of operation in a cooling device. [17][18][19][20][21][22][23][24][25][26][27][28][29] We find that the commonly observed secondary broad peak in the ECE of relaxors 20,28 is expected in any ferroelectric that is deep in the supercritical region of their phase diagram. Our results also bring into question the common practice of defining the electrocaloric strength of a material as the ratio of the entropy or temperature changes over the change in applied electric field.…”

mentioning

confidence: 99%