Enhanced electrocaloric effect in the Sm and Hf co-doped BaTiO3 ceramics

Zhang, Boyang; Lou, Xiaojie; Zheng, Kun; Xie, Xuefan; Shi, Peng; Guo, Mengyao; Zhu, Xiaoli; Gao, Yangfei; Liu, Qida; Kang, Ruirui

doi:10.1016/j.ceramint.2020.08.226

Cited by 29 publications

(7 citation statements)

References 44 publications

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“…This behavior is as per equations ( 9) and (10). ∆T and ∆S curves, which corresponds to a fixed applied electric field, exhibit a maximum around Tc due to the diffusion behavior of our sample near the ferroelectric-to-paraelectric phase transition and multiphase coexistence [47]. From equations ( 9) and (10), it is evident that materials having a more significant polarization gradient as well as a higher saturation field (E2) will show larger ∆T.…”

Section: Indirect Electrocaloric Measurementssupporting

confidence: 58%

“…Both methods show the same behavior, ΔT increase with temperature increasing, reach a maximum around Tc, and then decrease. This is due to the diffusion behavior of our sample near the ferroelectric-to-paraelectric phase transition [47] as discussed before. At room temperature, the ΔT obtained by LGD was found to be 2,33 K, which is lower than that found experimentally (2,11 K).…”

Section: Indirect Electrocaloric Measurementsmentioning

confidence: 55%

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Improved energy storage and electrocaloric properties of lead-free Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramic

Afaak

Mezzourh

Mezzane

et al. 2022

J Mater Sci: Mater Electron

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Lead-free Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) ceramic powders were synthesized using the sol-gel method. To achieve high-energy storage and large electrocaloric effect in bulk ceramics the ceramics thickness was reduced. Dielectric, ferroelectric, energy storage, and electrocaloric properties were investigated for BCZT ceramic with 400 µm. Here, pure crystalline structure and homogenous microstructure were identified by XRD analysis and SEM measurements, respectively. The dielectric measurements revealed a maximum dielectric constant associated with ferroelectric-paraelectric phase transition. The maximum of εr' was 7841 around 352 K. Furthermore, the BCZT ceramic showed improved energy storage and electrocaloric properties. A high recoverable energy density Wrec of 0.24 J/cm 3 and a total energy density Wtotal of 0.27 J/cm 3 with an efficiency coefficient of ~ 88% at 423 K under an electric field of 55 kV/cm was obtained. Besides, The maximum value of ΔT = 2.32 K, the electrocaloric responsivity ζ = 0.42 K mm/kV, the refrigeration capacity RC= 4.59 J/kg and the coefficient of performance COP = 12.38 were achieved around 384 K under 55 kV/cm. The total energy density Wtotal and the temperature change ΔT were also calculated by exploiting the Landau-Ginzburg-Devonshire (LGD) theory. The theoretical results matched the experimental findings.These results suggest that the synthesized BCZT ceramic with the reduced thickness could be a promising candidate for energy storage and electrocaloric applications.

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Section: Indirect Electrocaloric Measurementssupporting

confidence: 58%

Section: Indirect Electrocaloric Measurementsmentioning

confidence: 55%

Improved energy storage and electrocaloric properties of lead-free Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramic

Afaak

Mezzourh

Mezzane

et al. 2022

J Mater Sci: Mater Electron

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“…Figure 8A,B shows the comparison of ΔT and T span with those of other electrocaloric ceramics under the electric fields of 20-100 kV/cm, which demonstrates that the ceramics developed in the current paper possess higher ΔT and wider T span . 7,8,30,38,39,54,[56][57][58][59][60][61][62][63][64][65][66][67] Furthermore, the ΔT of BCT-0.13Sn and BCT-0.15Sn were measured by the direct method where the heat flow was under the electric fields of 10, 20, and 25 kV/cm to minimize the testing errors. Finally, the ΔQ value was subsequently determined by integrating the areas under the absorption and exothermic peaks and comparing them with the reference heat.…”

Section: Adiabatic Temperature Changementioning

confidence: 99%

“…28 Consequently, to induce structural changes conducive to application, researchers have opted to incorporate dopants with ionic radii similar to those in BT-based ceramics, such as Ca 2+ , Sr 2+ , Zr 4+ , Sn 4+ , and Hf 4+ , which facilitates the realization of their potential application. 25,[29][30][31][32][33][34] Kaddoussi et al 35 studied Ca 2+ -doped Ba(Zr 0.1 Ti 0.9 ) 0.925 Sn 0.075 O 3 ceramics and reported that doping with Ca ions into BT-based ceramics can improve the magnitude of ∆T and obtained a ∆T of 0.214 K under an electric field of 8 kV/cm. Sanlialp et al studied the electrical properties of Ba(Zr, Ti)O 3 -(Ba, Ca)TiO 3 by direct method and obtained a maximum ∆T of 0.33 K at 20 kV/cm electric field.…”

Section: Introductionmentioning

confidence: 99%

Large electrocaloric effect and wide working area in the transition from ferroelectric to nanodomains

Feng,

Hao,

et al. 2024

J Am Ceram Soc.

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A large adiabatic temperature change along with a wide operating temperature region is usually required for the electrocaloric materials to fulfill their refrigeration function. In general, doping foreign ions into BaTiO3 is the frequently utilized strategy in order to obtain excellent electrocaloric materials for the practical application. In the current paper, BaTiO3 lead‐free ferroelectric ceramics were doped by Ca2+ and Sn4+ simultaneously in order to generate a coexistence state at room temperature, where ferroelectric domains and nanodomains exit. As a result, a large polarization and a wide operating temperature range were finally induced. It is found that Ba0.9Ca0.1Ti0.85Sn0.15O3 has a maximum adiabatic temperature change of 0.85 K and an excellent working temperature region (65 K, ∆T > 90% Tmax) was achieved under an electric field of 50 kV/cm. The above phenomenon indicates that the modified BaTiO3 ceramics can be a good potential electrocaloric material in the state of cross‐existence of ferroelectric domains and nanodomains.

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“…The structure and properties of BT can further be influenced via doping at A-and B-sites with suitable elements [12,13]. A-site doping elements such as Sr [14], Ca [15], La [16], Ce [17], Ag [18] and Bsite doping elements such as Fe [19], Zr [20], Li [21], Sm [22], Mn [23] are some of the dopants of BT. These dopants cause structural distortions which strongly affect the Curie temperature (T c ) and phase transition of the resulting material [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Structural, Dielectric and Ferroelectric Characterizations of Sol-gel Prepared Ba_1-xSr_xTiO₃ Nanoceramics

Singh

Dixit

Dobal

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Ba1-xSrxTiO3 (0.0 ≤ x ≤ 0.5) nanoceramics were synthesized via sol-gel route and the structural and electric properties of the resulting compositions were investigated. revealed A tetragonal crystal structures for x = 0.0 - 0.3 and a cubic structure for x = 0.5 compositions was revealed by X-ray diffraction. The smaller ionic radii of Sr ions resulted in the lowering of c/a ratio with increasing x and a tetragonal to cubic structural transformation was observed at around x = 0.4. The average crystallite size gradually decreased with increasing x from 0 to 0.5. This trend was visible in electron micrographs. The room temperature dielectric constant in these nanoceramics increases with increasing Sr and a maximum value of 1553 was observed for x=0.3. Curie temperature (Tc ) of 125 °C was obtained for x=0.0, which shifted toward lower temperature with increasing x value. The value of Tc was observed as 100 and 75 °C for x = 0.1 and 0.3, respectively. The remnant polarization (Pr ), saturation polarization (Ps ), and coercive field (Ec ) decreased with increasing Sr concentration in BT due to the structural modifications. Value of Pr decreases from 0.637 to 0.229 μC/cm2, Ps decreases from 8.910 to 3.238 μC/cm2 and Ec decreases from 0.631 to 0.255 kV/cm with increasing x from 0 to 0.5.

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Enhanced electrocaloric effect in the Sm and Hf co-doped BaTiO3 ceramics

Cited by 29 publications

References 44 publications

Improved energy storage and electrocaloric properties of lead-free Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramic

Improved energy storage and electrocaloric properties of lead-free Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramic

Large electrocaloric effect and wide working area in the transition from ferroelectric to nanodomains

Structural, Dielectric and Ferroelectric Characterizations of Sol-gel Prepared Ba_1-xSr_xTiO₃ Nanoceramics

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Enhanced electrocaloric effect in the Sm and Hf co-doped BaTiO3 ceramics

Cited by 29 publications

References 44 publications

Improved energy storage and electrocaloric properties of lead-free Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramic

Improved energy storage and electrocaloric properties of lead-free Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramic

Large electrocaloric effect and wide working area in the transition from ferroelectric to nanodomains

Structural, Dielectric and Ferroelectric Characterizations of Sol-gel Prepared Ba1-xSrxTiO3 Nanoceramics

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Structural, Dielectric and Ferroelectric Characterizations of Sol-gel Prepared Ba_1-xSr_xTiO₃ Nanoceramics