Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 11
·1777-1788
·
IF 11.534
Niu Xiang,Jian Xiaodong,Gong Weiping,Liang Wei,Gong Xuetian,Zhang Guangzu,Jiang Shenglin,Yu Kun,Zhao Xiaobo,Yao Yingbang,Tao Tao,Liang Bo,Lu Sheng-Guo
Solid-state cooling technology based on electrocaloric effect (ECE) has been advanced as an alternative to replace the vapour-compression approach to overcome the releasing of the global warming gases. However, the development in high ECE materials is still a challenge. In this work, polarization merging strategy was proposed to achieve a large ECE in x Ba(Sn 0.07 Ti 0.93 )O 3 -( 1 − x )Ba(Hf 0.1 Ti 0.9 )O 3 ferroelectric ceramics, where x = 0, 0.2, 0.4, 0.6, 0.8, and 1. Ba(Sn 0.07 Ti 0.93 )O 3 with an orthorhombic phase and Ba(Hf 0.1 Ti 0.9 )O 3 with a rhombohedral phase at room temperature were prepared beforehand as precursors, and phase-coexisted x BSnT-(1− x )BHfT ceramics were formed via a solid-state reaction approach. Phase coexisting structures were confirmed using the X-ray diffraction. The merged polarization was confirmed by the dielectric and ferroelectric properties. Optimal ECEs were obtained for 0.2BSnT-0.8BHfT ceramics, i.e., adiabatic temperature change Δ T = 2.16±0.08 K at 80 °C and 5 MV/m, and Δ T = 3.35±0.09 K at 80 °C and 7 MV/m.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-9
·
IF 17.694
Ren Qingyong,Qi Ji,Yu Dehong,Zhang Zhe,Song Ruiqi,Song Wenli,Yuan Bao,Wang Tianhao,Ren Weijun,Zhang Zhidong,Tong Xin,Li Bing
One of the greatest obstacles to the real application of solid-state refrigeration is the huge driving fields. Here, we report a giant barocaloric effect in inorganic NH 4 I with reversible entropy changes of \(\Delta {S}_{{P}_{0}\to P}^{{{\max }}}\) ∼ 71 J K −1 kg −1 around room temperature, associated with a structural phase transition. The phase transition temperature, T t , varies dramatically with pressure at a rate of d T t /d P ∼ 0.79 K MPa −1 , which leads to a very small saturation driving pressure of Δ P ∼ 40 MPa, an extremely large barocaloric strength of \(\left|\Delta {S}_{{P}_{0}\to P}^{{{\max }}}/\Delta P\right|\) ∼ 1.78 J K −1 kg −1 MPa −1 , as well as a broad temperature span of ∼ 41 K under 80 MPa. Comprehensive characterizations of the crystal structures and atomic dynamics by neutron scattering reveal that a strong reorientation-vibration coupling is responsible for the large pressure sensitivity of T t . This work is expected to advance the practical application of barocaloric refrigeration.
研究领域:
材料科学
·
热力学
·
制冷工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yanzhou Lu,Xiaofan Sun,Min Zhao,Shulin Jiao,Dong Li,Peng Chen,Wentao Zhang,Kongmeng Ye,Libo Xu,Qi You,Hong-Ling Cai,XiaoShan Wu
The electrocaloric effect (ECE) is a novel technology that offers high efficiency and environmental friendliness, making it suitable for solid-state refrigeration applications. Among the extensively studied ECE materials, lead scandium tantalate (PST) stands out for its excellent performance. However, its applications are restricted by its narrow working temperature range. To overcome this limitation, we explore the enhancement of the ECE through zirconium ion doping. We synthesized PbSc0.5–0.5xTa0.5–0.5xZrxO3 samples (x = 0, 0.025, 0.05, 0.075). The introduction of zirconium ions led to an increase in the Curie temperature from 28.9 °C (x = 0) to 55.5 °C (x = 0.075). Additionally, the relaxation factor γ of the ceramics increased from 1.40 (x = 0) to 1.59 (x = 0.075). The temperature span (Tspan) exhibited a rising trend with increasing x, reaching 10.9 K at x = 0.075. The maximum temperature change (ΔTmax) was observed at x = 0.025, with a value of 1.94 K. X-ray diffraction (XRD) patterns revealed that zirconium ion doping influenced the B-site ordering degree, thereby regulating the ECE. To further validate the results, we employed direct measurements and thermodynamic calculations. Overall, the regulation of ionic ordering through zirconium doping effectively enhances the ECE performance. These findings contribute to the development of advanced materials for solid-state refrigeration technologies.
研究领域:
材料科学
·
固体物理
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制冷技术
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·11180
·
IF 15.7
Zhang Yibo,Ye Zhiwei,Niu Fukun,Xiong Chuanxi,Wang Wei,Fu Yuheng,Zhang Shixian,Wang Shan,Yang Quanling,Qin Hongmei,Liu Shuang,Wang Qing
Poly(vinylidene fluoride) (PVDF), the most widely used ferroelectric polymer, typically exhibits a negligible electrocaloric effect (ECE) due to its symmetrical molecular configuration and bulky ferroelectric domains. PVDF-based ferroelectric terpolymers with giant ECE are expensive and have a narrow temperature window ( T w ). Here, we report that PVDF films prepared by solid-phase pressure forming (PVDF-SPF) show a giant ECE of up to 12.8 K at 25 °C and a wide T w of 60 °C. PVDF films underwent significant plastic deformation and extensive crystal fragmentation, forming loose and tiny β crystal grains under 30 MPa solid-phase pressure. The giant ECE primarily originates from orientation entropy changes of molecular chains associated with the reversible transition between loose and compact β crystals, as well as switching entropy changes of polar dipoles in tiny grains. Given the availability of PVDF, this work opens a route for the development of scalable solid-state cooling techniques.
研究领域:
材料科学
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聚合物物理
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铁电材料
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固态制冷
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热电材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Xiaofang Zhang,Weimin Xia,Yinghui Wang,Yingjuan Yan,Xusheng Wang
The electrocaloric effect (ECE) in ferroelectric materials is considered a candidate for solid-state refrigeration technology due to its merits of environmental friendliness, high integration, and low energy consumption. Herein, a series of poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)) terpolymers are synthesized by using the hydrogenation method and are then compounded with the conductive filler graphene nanosheets (GR) to obtain GR/P(VDF-TrFE-CTFE) composites. Benefiting from the large specific surface area of GR, the interfacial polarization of GR/P(VDF-TrFE-CTFE) composite is significantly improved, contributing to a high maximum polarization (~2.35 μC/cm 2 ). As such, a maximum adiabatic temperature change (Δ T ) of ~4.22 K (at 320.6 K) is realized in GR/P(VDF-TrFE-CTFE) composite with 0.05 wt% GR at a low electric field of 50 MV/m, which is an improvement of 51.8% compared to the pure P(VDF-TrFE-CTFE) (Δ T is ~0.08 K at 320.5 K). This result indicates the latent capacity of GR fillers in increasing the ECE of ferroelectric polymer materials, providing a new approach for designing the optimal filler/polymer combination suitable for solid-state refrigeration.
研究领域:
材料科学
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高分子科学
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固态制冷
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纳米技术
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电热效应
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2021
·
IF 3.059
Dandan Zhang,Xiuli Zhang,Xingjia Li,Zhu Liang,Haisheng Xu,Zhaoyue Lv,Xiaodong Sang,Saisai Li
In recent years, compared with traditional refrigeration technology, the electrocaloric refrigeration technology has been applied in variety of green cooling devices due to its high efficiency and environmentally friendly. Recent findings reveal that the ceramic system with additives (such as, LiBiO 2 , PbO) can create large ECE under low electric field. In this work, the ternary glass BaO–CaO–SiO 2 (BCS) was used as a sintering aid to enhance the electrocaloric (EC) response of 0.2Ba(Ti 0.9 Sn 0.1 )O 3 -0.8Ba(Zr 0.18 Ti 0.82 )O 3 (BZSnT20) bulk ceramics. The EC properties of BZSnT20 could be also improved via controlling sintering temperature and the content of BCS sintering aid. It was found that BZSnT20 with 0.5 wt% BCS show the maximum EC response of 3.2 K under 7 MV/m with sintering temperature of 1262 °C. These results demonstrated that the ECE of BZSnT20 can be boosted by using appropriate additives, which provides an effective route to realize large ECE under low electric fields.
研究领域:
材料科学
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功能陶瓷
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固态制冷
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电介质物理
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无铅压电材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 23
·39700-39706
·
IF 5.2
Xinkun Liu,Ying Dai,Xinmei Pei,Wen Chen
Ferroelectric thin films with giant room-temperature electrocaloric effect (ECE) could be very useful in design of solid-state refrigeration devices. Here, lead-free Ba 0.85 Ca 0.15-x Sr x Zr 0.1 Ti 0.9 O 3 (BCZT-xSr, 0.01 ≤ x ≤ 0.10) thin films are successfully prepared on the substrates (Pt/Ti/SiO 2 /Si) via sol-gel route, and the effect of the Sr substitution on the structure, electric properties and ECE of the films were investigated. The dielectric analyses show that the rhombohedral-tetragonal phase transition temperature (T R-T ) move to a higher temperature and the tetragonal-cubic phase transition temperature (T m ) shift to a lower temperature with increasing Sr content, and finally the T R-T peaks merge into the T m peaks at room temperature. The BCZT-0.05Sr film presents a giant ECE with ΔT = 27.1 K and ΔS = 30.6 J K −1 kg −1 at 800 kV cm -1 near room temperature (301 K). The giant ΔT benefits from a multiphase coexisting region with successive R-T and T-C phase transition character near room temperature. These results indicate that the lead-free Sr-doped BCZT thin film is an attractive material for application in ECE refrigeration devices.
研究领域:
材料科学
·
凝聚态物理
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功能材料
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热电转换
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固态制冷
✓ 已验证
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Kanghua Li,Changyuan Wang,Ke Xu,Kailun Zou,Xu Wang,Junning Li,Ling Lin,Lulu Liu,Fangyuan Luo,Wenrong Xiao,Feifan Yang,Shenglin Jiang,Huan Liu,Qi Li,Rujun Ma,Yang Liu,Houbing Huang,Guangzu Zhang
While the electrocaloric effect (ECE) presents a promising approach for solid-state thermal management in integrated circuits, the development of ferroelectric materials exhibiting high ECE at elevated temperatures remains a significant bottleneck. Herein, we report multilayered ferroelectric polymer composites that demonstrate a giant ECE across a broad temperature range. By strategically tailoring the electric field distribution and optimizing polarization behavior through the controlled dispersion of ferroelectric ceramic nanofillers in the polymer matrix, as supported by phase-field modeling, the composites show a large adiabatic temperature change (ΔT) of 25.3 K and a high entropy change (ΔS) of 0.25 J cm–3 K–1 at room temperature. To further suppress electrical conduction, [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) was introduced into the polymer layers. The multilayered ferroelectric nanocomposites achieve ΔT and ΔS values exceeding 20 K and 0.18 J cm–3 K–1, respectively, over a temperature range of 0–80 °C. This work offers a promising design strategy for developing high-performance electrocaloric materials for thermal management in advanced microelectronic systems.
研究领域:
材料科学
·
铁电材料
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固态制冷
·
纳米复合材料
·
微电子系统热管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE SCIENCES
·
2025
·
IF 3.3
Li Ma,Luping Song,Zhe Zheng,Yuejing Lan,Linsen Zhou,Ruopu Liu,Yuansen Li,Zhijie Wei,Shaoyi Wu,Yan Shi,Guangkun Ren
Thermoelectric materials are widely employed in different areas, like deep space exploration for power generation and cooling in the thermal management of electronics. To obtain excellent performance in thermoelectric system, the materials are required to own great properties such as ZT at suitable temperature. Normal room-temperature materials like bismuth telluride may suffer from efficiency reduction of power generation or cooling, because of significant variation of ZT from 300K to 500K. Nowadays, it may be resolved by using another material lead telluride (PbTe) which is usually seen as a mid-temperature material in previous work. Recently, researchers have found that lead chalcogenides including PbTe can refrigerate near room temperature. Furthermore, we doped PbTe with silver (Ag) and found it possessed stable cooling efficiency owing to the smooth ZT from 300K to 523K. Through synthesizing a set of p-type Pb 1- x Ag x Te-5 at.% Te ( x = 0–0.02) samples by melting and hot-press technology in Te-rich condition, we discovered the ZT was about 0.4 at 300K along with the average one reaching 0.38 and kept stable from 300K to 523K. Besides, the virtual thermoelectric cooler consisting of the 7-pair p-n junction showed the △ T max and COP max values can reach 54.9K and 9.3 % at 300K, respectively. This investigation highlights that the PbTe-based composition with silver dopant has the potential for refrigerating devices at or near room temperature in the future.
研究领域:
材料科学
·
热电学
·
固态制冷
·
能量转换
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Li Xuexin,Li Jinglei,Li Yang,Liu Xuechen,Yang Shuai,Wu Jie,Hou Dingwei,Zhang Jinjing,Wu Haijun,Zhang Yang,Ding Xiangdong,Sun Jun,Zhang Shujun,Du Hongliang,Li Fei
Relaxor ferroelectric ceramics have emerged as promising candidates for electrocaloric cooling systems due to their relatively higher heating and cooling capacities. However, simultaneously achieving high temperature changes (Δ T ) and a wide operating temperature range remains a significant challenge, limiting their practical applications. This work proposes a synergistic strategy that involves precise compositional tuning of the BaTiO 3 - x KNbO 3 system to customize the rhombohedral-to-cubic phase boundary around room temperature, coupled with engineering grain orientation of the ceramics. Based on this approach, a maximum Δ T of 3.9 K is achieved in <111> c -texture BaTiO 3 -KNbO 3 ceramics, outperforming most environmentally friendly ceramics. Notably, the Δ T variation remains within ±10% across a temperature range of 30 °C to 80 °C, demonstrating a promising material for the design and application of electrocaloric cooling devices. This work provides new insights for the design of ceramics with optimized electrocaloric properties, offering significant potential for improving the efficiency and functionality of next-generation cooling technologies and devices.
研究领域:
材料科学
·
铁电材料
·
固态制冷
·
陶瓷工程
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）