Superior Electrocaloric Performance Enabled by Highly Robust Monomorphic Ferrodistortion in NaNbO3‐Based Relaxor DOI Open Access
Feng Li, Xiaoli Ji, Xiangjian Wang

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 11, 2024

Abstract A synergistic realization of high electrocaloric effect (ECE) and excellent temperature stability in ferroelectrics are foundation for practical applications, which is, however, a major challenge ferroelectric cooling community thus far. In confront with this long‐standing issue, an emergent monomorphic ferrodistortion strategy NaNbO 3 ‐based relaxor is proposed flexible tetragonal polar nanoregions immersing short‐range oxygen octahedral tilt. This not only contributes to large quantities entities increase entropy change but also produces highly robust tilt persist ferroelectricity obstruct thermal agitations. Therefore, Δ T 0.96 K ultrawide span 110 record‐high figure merit 4.74 achieved Ta‐doped ‐BaTiO ceramics these superior EC performances present remarkable breakthrough bulks cooling. work provides innovative way utilizing ferrodistortive feature simultaneously boost value as effective develop high‐performance entropy‐change materials.

Language: Английский

Direct measurement of large electrocaloric effect in BZT-BST lead-free relaxor ferroelectrics near room temperature DOI

Yahui Tian,

Fei Xue, Li Wang

et al.

Ceramics International, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

Citations

0
Enhanced electrocaloric effect in BaTiO3‐based ceramics over a wide working temperature range by domain engineering DOI
Minghui Hao, Guanghua Wu, Ying Zheng

et al.

Journal of the American Ceramic Society, Journal Year: 2025, Volume and Issue: unknown

Published: April 11, 2025

Abstract BaTiO 3 ‐based lead‐free ferroelectric ceramics are among the most widely utilized materials in contemporary industrial applications and exhibit a high potential for large electrocaloric effect under moderate electric fields. In this study, La 3+ Nb 5+ were introduced into BaSn 0.05 Ti 0.95 O ceramics. By adding small amount of dopants, tetragonality was weakened, causing phase transition peak to shift room temperature. Simultaneously, domain structure optimized, successfully achieving concurrent existence both domains nanodomains. Thus, working temperature range ( T span ) adiabatic change (∆ effectively balanced. Finally, ∆ 1.31 K an field 50 kV/cm attained at x = 0.0125. addition, Δ /Δ E reached 0.262 × 10 −6 m/V, ≥ 0.8 max 54°C indicating that ceramic is high‐performance material solid‐state cooling applications.

Language: Английский

Citations

0
Tunable and anomalous electrocaloric behaviors in Bi0.5Na0.5TiO3-based relaxor enabled by dynamics of polar nanoregions DOI
Feng Li, Xuan Wang, Mingsheng Long

et al.

Acta Materialia, Journal Year: 2025, Volume and Issue: 293, P. 121093 - 121093

Published: April 29, 2025

Language: Английский

Citations

0
Anomalous electrocaloric behaviors in (anti)ferroelectrics: a mini-review DOI Creative Commons
Feng Li, Chunchang Wang, Lei Shan

et al.

Frontiers in Chemistry, Journal Year: 2024, Volume and Issue: 12

Published: Oct. 23, 2024

Solid-state cooling, represented by the electrocaloric effect (ECE) in (anti)ferroelectric materials, has emerged as an alternative green refrigeration technology virtue of its high efficiency and miniaturization is expected to substitute conventional vapor-compression. Significant progress been made developing high-performance EC materials since revival. However, anomalous behaviors are frequently observed, including asymmetric negative profiles, physical mechanism behind this still under debate. Its rationalization great importance full utilization could enhance strength and/or cooling capacity. This mini-review gives a brief overview research advances anomalies (anti)ferroelectrics with hope provoking thought on design reconstructed cycles superior for application solid-state devices.

Language: Английский

Citations

2
Large electrocaloric effect by disorder regulated structure in BaTiO3-based system DOI
Lei Xie, Gaochao Zhao,

Jinquan Dou

et al.

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(19)

Published: Nov. 4, 2024

We report the effects of B-site cationic size disorder (σ2) and configurational entropy (CE) on crystal structure electrocaloric (EC) effect BaTi1−x−ySnxZryO3 (BTSZ) (0.01 ≤ x 0.06) ceramics. The samples were designed to show decreased σ2 increased CE but same cation average radius tolerance factor with increasing x. tetragonal lattice distortion c/a piezoelectricity showed a minimum maximum, respectively, near = 0.04. ferroelectric Curie temperature overall from ∼358 ∼332 K 0.01 0.06. EC measured by direct method maximum an adiabatic change ∼0.80 at 60 kV/cm large in 0.04 is attributed small low energy barrier for E-induced phase transformation due combined configuration. Our results suggest close correlation between effective route improve effects.

Language: Английский

Citations

0
Temperature dependent electrocaloric performances in Pb0.97La0.02(Hf0.92Ti0.08)O3 antiferroelectric ceramic with triple phase structures DOI

Mengjiao Yu,

D. Wu,

Changshun Dai

et al.

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(22)

Published: Nov. 25, 2024

Antiferroelectric–ferroelectric phase transition in antiferroelectric (AFE) materials usually triggers high-performance electrocaloric effect (ECE), as represented by PbZrO3-based AFE. As an isostructure to PbZrO3, EC research PbHfO3-based AFE ceramics are significantly left out. In this work, temperature dependent performances Pb0.97La0.02(Hf0.92Ti0.08)O3 with typical features explored, and rhombohedral ferroelectric (FER), AFE1 (A1, Pbam), AFE2 (A2, Imma) triple phases induced increases. This leads dual coexisting regions FER-to-A1 A1-to-A2 at a of ∼20 °C ∼100 °C, respectively, where local maxima produced ΔT ∼0.06 K ∼0.16 (E = 70 kV/cm). These certified comprehensive characterizations situ x-ray diffractometer, electrical properties, Raman spectra analysis. strongly indicates that (Pbam)-to-AFE (Imma) could efficiently optimize ECE AFE, addition the conventional understandings FE–paraelectric AFE–paraelectric modulation strategy. work not only presents potential solid-state cooling applications but also serves catalyst for further seeking high-EC materials.

Language: Английский

Citations

0
Superior Electrocaloric Performance Enabled by Highly Robust Monomorphic Ferrodistortion in NaNbO3‐Based Relaxor DOI Open Access
Feng Li, Xiaoli Ji, Xiangjian Wang

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 11, 2024

Abstract A synergistic realization of high electrocaloric effect (ECE) and excellent temperature stability in ferroelectrics are foundation for practical applications, which is, however, a major challenge ferroelectric cooling community thus far. In confront with this long‐standing issue, an emergent monomorphic ferrodistortion strategy NaNbO 3 ‐based relaxor is proposed flexible tetragonal polar nanoregions immersing short‐range oxygen octahedral tilt. This not only contributes to large quantities entities increase entropy change but also produces highly robust tilt persist ferroelectricity obstruct thermal agitations. Therefore, Δ T 0.96 K ultrawide span 110 record‐high figure merit 4.74 achieved Ta‐doped ‐BaTiO ceramics these superior EC performances present remarkable breakthrough bulks cooling. work provides innovative way utilizing ferrodistortive feature simultaneously boost value as effective develop high‐performance entropy‐change materials.

Language: Английский

Citations

0