Large electrocaloric effect over a wide temperature range in BaTiO<sub>3</sub>-modified lead-free ceramics

Zhao, Luo; Ke, Xiaoqin; Zhou, Zhijian; Liao, Xiaoqi; Li, Junjie; Wang, Yu; Wu, Ming; Li, Tangyuan; Bai, Yang; Ren, Xiaobing

doi:10.1039/c8tc06110f

Cited by 73 publications

(67 citation statements)

References 43 publications

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“…Therefore, lead-free ferroelectric materials have been considered as better substitute for electrocaloric refrigeration, such as BaTiO 3 (BT)-based, Na 0.5 Ba 0.5 TiO 3 (NBT)-based, and K 0.5 Na 0.5 NbO 3 (KNN)-based materials. The similar phase transition between different ferroelectric phases is also obtained in (Ba 0.87 Ca 0.13 )(Ti 0.87 Hf 0.13 )O 3 ceramic as reported by Zhao et al, 8 achieving a ΔT of 0.47 K at 60°C. 8,10,11,13 However, T C is often higher than room temperature for the current reported ferroelectric materials, which is not conducive to the application of electronic device cooling at room temperature.…”

Section: Introductionsupporting

confidence: 86%

“…8,[43][44][45][46] Hence, people attach important to the direct measurement as a more effective method to evaluate the ECE. 8,[43][44][45][46] Hence, people attach important to the direct measurement as a more effective method to evaluate the ECE.…”

Section: Resultsmentioning

confidence: 99%

“…It is observed that an exothermic peak occurs by applying an electric field, corresponding to heat be released to the environment. 8,12,50,51 The pyroelectric effect refers to the polarization change caused by temperature change, which is the reversed process of ECE. For all studied samples, the magnitude of the peaks increases with increasing electric field at a constant test temperature.…”

Section: Resultsmentioning

confidence: 99%

“…1 Thereafter, some works on large ECE have been reported in lead-based ceramics and films. 8,10,11,13 However, T C is often higher than room temperature for the current reported ferroelectric materials, which is not conducive to the application of electronic device cooling at room temperature. Therefore, lead-free ferroelectric materials have been considered as better substitute for electrocaloric refrigeration, such as BaTiO 3 (BT)-based, Na 0.5 Ba 0.5 TiO 3 (NBT)-based, and K 0.5 Na 0.5 NbO 3 (KNN)-based materials.…”

Section: Introductionmentioning

confidence: 92%

“…Many efforts have been devoted to the ECE in the last few decades, especially after the giant ECE was demonstrated in PbZr 0.95 Ti 0.05 O 3 (PZT) ferroelectric thin-films. [8][9][10][11][12] Normally, the high ECE can be achieved in the vicinity of the Curie temperature (T C ) or the polymorphic phase transition (PPT) region with different ferroelectric phases in ferroelectric materials due to the large entropy change. [2][3][4][5][6][7] Unfortunately, the PZT-based materials contain a large portion of hazardous lead substance, confronting with global restrictions.…”

Section: Introductionmentioning

confidence: 99%

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Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics

Yang

Hao

2019

J Am Ceram Soc

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The issue of how to achieve an electrocaloric effect (ECE) and pyroelectric effect in a material simultaneously remains to be a challenge for developing practical solid‐state cooling devices and RF‐detectors. Here, we structure a polymorphic phase transition (PPT) region by doping modification in KNN‐based ceramics, which are developed to achieve the ECE. The direct measured ECE and pyroelectric properties are investigated in lead‐free (1‐x)K0.5Na0.5NbO3‐xBi0.5Na0.5ZrO3 (KNN‐xBNZ) ceramics. The adiabatic temperature change (∆T) of 0.22 K at 100°C, 0.14 K at 70°C and 0.16 K at 30°C can be obtained under an electric field of 35 kV cm–1 for x = 0.03, 0.04 and 0.05, respectively. In addition, the temperature dependence of pyroelectric coefficient (p) is established for all compositions via the Byer‐Roundy method. A large p of 454.46 × 10–4 C m–2 K–1 is detected at Curie temperature (TC) in the ceramics with x = 0.03. Achieving electrocaloric effect and pyroelectric performance simultaneously may shed light and provide a feasible design scheme for developing practically useful electrocaloric and pyroelectric materials.

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Section: Introductionsupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics

Yang

Hao

2019

J Am Ceram Soc

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Room‐Temperature Symmetric Giant Positive and Negative Electrocaloric Effect in PbMg_0.5W_0.5O₃ Antiferroelectric Ceramic

et al. 2021

Adv Funct Materials

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As an emerging solid‐state refrigeration technology with zero‐emission and high energy conversion efficiency, there is a compelling need for ferroelectric materials with giant electrocaloric effects (ECEs) at room temperature suitable for refrigeration applications. The complex perovskite antiferroelectric (AFE), PbMg0.5W0.5O3, containing non‐equivalent B‐site ions with a symmetric giant positive and negative ECE near room temperature is presented. At the Curie temperature of 36 °C, the first‐order AFE–paraelectric phase transition gives rise to a large enthalpy change of 3.92 J g−1, more than four times that of BaTiO3. This leads to a significant ECE under the influence of an electric field. The direct electrocaloric characterization shows that the adiabatic temperature change, ΔT, exhibits symmetric peaks with a giant positive maximum of 1.79 K (ΔS = 1.68 J kg−1 K−1) at 36 °C and a negative maximum of −2.02 K (ΔS = −1.93 J kg−1 K−1) at 34 °C. The ultrahigh magnitude of ΔT near room temperature makes PbMg0.5W0.5O3 a superior electrocaloric material far beyond traditional PbZrO3‐based AFEs. The coexistence of symmetric giant positive and negative ΔT to further improve cooling efficiency is expected. In addition, the good reversibility and negligible leakage current should pave the way for practical applications.

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Emergent Enhanced Electrocaloric Effect within Wide Temperature Span in Laminated Composite Ceramics

Yin

et al. 2021

Adv Funct Materials

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An outstanding challenge for high‐efficient and zero‐emissions ferroelectric refrigeration is to maintain a large adiabatic temperature change (ΔT) over a wide temperature span (Tspan) resulting from the electrocaloric effect (ECE). A multilayer ferroelectric structure with interlayer synergistic phase transitions as a means to address this problem is proposed. BaTi0.89Sn0.11O3, BaTi0.85Zr0.15O3, and BaTi0.89Hf0.11O3 were selected as the components of each layer, the compositions of which are fixed at the tricritical point (TP) in each system and where the transition temperatures increase sequentially. Ferroelectrics near TP have a high sensitivity to external fields and the good co‐firing adhesion leads to strong electrical and stress interface coupling between adjacent layers. The electric‐field‐induced phase transition in one layer then synergistically induces a phase transition in the near interface part of the adjacent layer, which is close to but is not at the transition point yet. As a result, the enhanced ECE performance, including both a large ΔTmax = 0.63 K and a wide Tspan = 57 °C (ΔT ≥ 80% ΔTmax), exceeds that associated with the sum of the individual components. An efficient composite materials design strategy to develop high‐performance electrocaloric materials with excellent ECE properties for practical refrigeration applications is thus proposed.

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Large electrocaloric effect over a wide temperature range in BaTiO₃-modified lead-free ceramics

Abstract: BT-13CH exhibits a large electrocaloric effect over a broad temperature range because of multiphase coexistence (MPC) with diffuse phase transition (DPT) character.

Cited by 73 publications

References 43 publications

Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics

Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics

Room‐Temperature Symmetric Giant Positive and Negative Electrocaloric Effect in PbMg_0.5W_0.5O₃ Antiferroelectric Ceramic

Emergent Enhanced Electrocaloric Effect within Wide Temperature Span in Laminated Composite Ceramics

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Large electrocaloric effect over a wide temperature range in BaTiO3-modified lead-free ceramics

Abstract: BT-13CH exhibits a large electrocaloric effect over a broad temperature range because of multiphase coexistence (MPC) with diffuse phase transition (DPT) character.

Cited by 73 publications

References 43 publications

Electrocaloric effect and pyroelectric performance in (K,Na)NbO3‐based lead‐free ceramics

Electrocaloric effect and pyroelectric performance in (K,Na)NbO3‐based lead‐free ceramics

Room‐Temperature Symmetric Giant Positive and Negative Electrocaloric Effect in PbMg0.5W0.5O3 Antiferroelectric Ceramic

Emergent Enhanced Electrocaloric Effect within Wide Temperature Span in Laminated Composite Ceramics

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Resources

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Large electrocaloric effect over a wide temperature range in BaTiO₃-modified lead-free ceramics

Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics

Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics

Room‐Temperature Symmetric Giant Positive and Negative Electrocaloric Effect in PbMg_0.5W_0.5O₃ Antiferroelectric Ceramic