JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 33
·24986-24994
·
IF 2.779
Cheng Li-Qian,Jiang Guozheng,Ma Zhenhua,Xu Ze,Yu Minghao,Lu Jingtong,Chen Kai
Al-doped BaZr 0.2 Ti 0.8 O 3 (BZT20) ceramics were prepared by solid-state sintering, and the relaxation degree of phase transition was tailored effectively. The microstructure, dielectric properties, ferroelectric properties, and electrocaloric (EC) performance of Al 2 O 3 -doped BZT20 ceramics were studied, respectively. The results show that Al 2 O 3 doping induces changes in Curie temperature and dielectric properties. When the additive amount of Al 2 O 3 is 1.25 at.%, the Curie temperature drops to around room temperature (RT), and the dielectric loss is lower than that of pure BZT20 ceramics. The diffusion constant γ reaches a minimum value of 1.57 when the Al 2 O 3 content is 1.25 at.%, indicating that a relatively large latent heat would be gathered while there is a phase transition. As a result, an enhanced EC response of ∆ T max = 0.293 K near RT is obtained when the Al 2 O 3 content is 1.25 at.%, which is 1.6 times that of pure BZT20. It is also impressive that a wide working temperature range can be obtained, that is, T span = 73 K for BZT20 ceramics with 1 at.% of Al 3+ ionic content.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xiao-Dong Jian,Biao Lu,Dan-Dan Li,Ying-Bang Yao,Tao Tao,Bo Liang,Xiong-Wei Lin,Jin-Hong Guo,Yi-Jiang Zeng,Sheng-Guo Lu
Barium strontium zirconate titanate ceramics ((BaSr)(ZrTi)O3-BSZT) with Zr4+ ionic contents of 15 and 20 mol % and Sr2+ ionic contents of 15, 20, 25, and 30 mol % were prepared using a solid-state reaction approach. X-ray diffraction and scanning electron microscopy were used to characterize the lattice structure and morphologies of the ceramics. Permittivity and polarization as a function of temperature were characterized using an impedance analyzer and a Tower–Sawyer circuit. The electrocaloric effect was measured directly and calculated using the Maxwell relation (indirectly). The results indicated that the BSZT ceramics change from a normal ferroelectric to a relaxor ferroelectric with increasing Zr4+ ionic content, which can be further modified by the addition of Sr2+ ionic content. The optimized adiabatic temperature change ΔT obtained is 2.43 K in (Ba0.85Sr0.15)(Zr0.15Ti0.75)O3 ceramics, and ΔT >1.6 K over a wide temperature span of 120 °C was obtained.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiao-Dong Jian,Biao Lu,Dan-Dan Li,Ying-Bang Yao,Tao Tao,Bo Liang,Sheng-Guo Lu
Barium zirconate titanate (Ba(Zr x Ti 1-x )O 3 ) thick film ceramics were prepared using a tape-casting method. Their structures, morphologies, and electric properties were characterized using XRD , SEM and impedance analysis approaches, respectively. The electrocaloric effects (ECE), i.e., isothermal entropy changes and adiabatic temperature changes, were calculated using a Maxwell relation. It was confirmed by XRD and SEM that the obtained thick film ceramics are pure and dense perovskite structures. The dielectric analyses indicate that the Ba(Zr x Ti 1-x )O 3 thick film ceramics show characteristics of transition from normal to relaxor ferroelectrics with the increasing Zr 4+ ionic content. The polarization – electric field (P-E) hysteresis loops reveal larger polarizations and the ceramics can withstand an electric field as high as 12 MV/m. The adiabatic temperature changes ΔT calculated via the Maxwell relation and the polarization as a function of temperature, which is extracted from the P-E hysteresis loops measured at 12 MV m −1 are from 3.7 to 0.28 K with the increasing Zr 4+ ionic content.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 15
·2209181
·
IF 29.4
Peijia Bai,Quan Zhang,Heng Cui,Yiwen Bo,Ding Zhang,Wen He,Yongsheng Chen,Rujun Ma
More than 55% of electronic failures are caused by damage from localized overheating. Up to now, there is still no efficient method for targeted temperature control against localized overheating. Although some existing thermal management devices handle this issue by full coverage cooling, it generates a lot of useless energy consumption. Here, a highly efficient pixel-matrix electrocaloric (EC) cooling device is reported, which can realize a targeted and differential thermal management. The modified poly(vinylidene fluoride-tertrifluoroethylene-chlorofluoroethylene) reaches a large adiabatic temperature change of 7.8 K and is more suitable for thermal transfer and electrostatic actuation at high frequencies. All active pixels in the EC cooling device exhibit a stable temperature span of 4.6 K and a heat flux of 62 mW cm -2 , which is more than twice that of the one-layer EC device. Each refrigeration pixel can be independently controlled and effectively cooled down the localized overheating site(s) in situ. The surface temperature of the simulated central processing unit decreases by 33.2 K at 120 s after applying this EC device. Such a compact, embeddable, low cost, and active solid-state pixel-matrix cooling device has great potential for localized overheating protection in microelectronics.
研究领域:
材料科学
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电子工程
·
热能工程
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 4
·1302-1312
·
IF 8.067
Hui Tang,Xiang Niu,Peng-Fei Zhao,Xin-Gui Tang,Xiao-Dong Jian,Xian-Yi Chen,Xiao-Cao Peng,Zhi-Peng Yang,Sheng-Guo Lu
xBiFeO3–(1 − x)BaTiO3 relaxor ferroelectric ceramics were synthesized via the high-temperature solid-state reaction process. The X-ray diffraction patterns of xBiFeO3–(1 − x)BaTiO3 showed that the structure of samples was transformed from the tetragonal phase to the pseudo-cubic phase when x ≥ 0.025. The calculated universal Curie–Weiss constants and slim shape of the polarization-electric field hysteresis loops indicated that xBiFeO3–(1 − x)BaTiO3 ceramic was converted from a normal ferroelectric to a relaxor ferroelectric. The energy-storage properties of 0.1BiFeO3–0.9BaTiO3 were also measured at room temperature. The maximum discharged energy density and efficiency procured were 1.22 J cm−3 and 85.98%, respectively. The electric field-dependent energy-storage density was fitted using an exponential function of En, and it was found that n < 2. It was worth noting that the positive electrocaloric effect (ECE) was observed in xBiFeO3–(1 − x)BaTiO3 bulk ceramics, no matter when directly measured using a thermocouple or indirectly calculated using the Maxwell relation. Also, a ΔTmax of 1.55 K was indirectly calculated from the temperature-dependent P–E hysteresis loops for 0.05BiFeO3–0.95BaTiO3; while a ΔTmax of 2.20 K was directly obtained using the thermocouple. The positive ECE means that the xBiFeO3–(1 − x)BaTiO3 is a conventional ferroelectric or relaxor ferroelectric. Finally, the electrocaloric strengths measured were considered with the equation dT/dE obtained by Lu et al.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chengwen Bin,Xu Hou,Zeqing Yu,Luocheng Liao,Han Yang,Yunya Liu,Jie Wang
Flexible ferroelectric films with high polarization hold great promise for energy storage and electrocaloric (EC) refrigeration. Herein, we fabricate a lead-free Mn-modified 0.75 Bi(Mg0.5Ti0.5)O3–0.25 BaTiO3 (BMT–BTO) thin film based on a flexible mica substrate. Excellent EC performance with maximum adiabatic temperature change (ΔT ∼23.5 K) and isothermal entropy change (ΔS ∼33.1 J K–1 kg–1) is achieved in the flexible BMT–BTO film, which is attributed to the local structural transition and lattice disorder near 90 °C. Meanwhile, a good energy storage density of ∼70.6 J cm–3 and a quite high efficiency of ∼82% are realized in the same ferroelectric film, accompanied by excellent stability of frequency and electric fatigue (500–10 kHz and 108 cycles). Furthermore, there is no apparent variation in performance under different bending strains. These prominent properties indicate that the multifunctional BMT–BTO ferroelectric film is a promising candidate for applications of flexible energy storage and EC refrigeration.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 9
·12001-12016
·
IF 2.478
Qian Guoming,Zhu Kongjun,Li Xia,Yan Kang,Wang Jing,Liu Jinsong,Huang Weiqing
Pb 0.8 Ba 0.2 ZrO 3 (PBZ) nanofibers were prepared through electrospinning and mixed at a volume composite ratio of 0–6% with polyvinylidene fluoride (PVDF) dissolved in an organic solvent, and the PBZ/PVDF composite film was prepared through casting. The nanocomposites with PBZ nanofibers of 3 vol% showed the best ferroelectric performance in this work, and the maximum polarization value and breakdown field strength were 9.69 μC/cm 2 and 420 MV/m, respectively. The dielectric constant and dielectric loss at a depolarization temperature of 285 K were 6.13 and 0.21, respectively. The performance of the electrocaloric effect was studied using the direct method near room temperature. Under 150 MV/m and − 30 °C, the △ T and Δ S of the composite film were 13.99 K and 52.70 J/kg K, respectively. When the temperature increased to 70 °C, △ T and Δ S become 5.08 K and 13.56 J/kg K, respectively. The simulation results and experiments indicate that the incorporation of nanofibers can increase the interface polarization with higher polarization value and improve the ferroelectric performance than pure PVDF.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Bangxian Xie,Yingzhi Meng,Mingmei Lin,Hongle Fan,Renjun Xu,Chunming Chen,Dingyuan Wang,Biaolin Peng,Zhihong Luo,Laijun Liu
The electrocaloric effect (ECE) is an emerging green refrigeration technology that demonstrates significant potential for solid-state cooling applications due to its high energy efficiency and environmental friendliness. Pb(Sc 0.5 Ta 0.5 )O 3 (PST) ceramics exhibit excellent electrocaloric effect performance at room temperature, but its phase transition range is relatively narrow. Therefore, achieving a broad operating temperature range ( T span ) while maintaining a high adiabatic temperature change (Δ T ) remains challenging. In this work, the ECE performance of PST ceramics is enhanced across a wide temperature range from 30 °C to 150 °C via a compositionally-induced disorder transition strategy by preparing (1- x )Pb(Sc 0.5 Ta 0.5 )O 3 - x PbTiO 3 ( x = 0.00, 0.05, 0.10, 0.15, and 0.20). The optimal composition ( x = 0.10) exhibits a maximum Δ T of 2.34 K and maintains Δ T > 1.38 K over a broad temperature range from 30 °C to 150 °C. Meanwhile, the T span (Δ T > 80 % Δ T max ) increased from 33 K ( x = 0.00) to 66 K ( x = 0.10). This outstanding electrocaloric performance positions it as a promising candidate for practical applications from room temperature to elevated temperatures, contributing to the advancement of next-generation solid-state refrigeration technology.
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产品关联
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Changhong Yang,Chao Feng,Panpan Lv,Jin Qian,Yajie Han,Xiujuan Lin,Shifeng Huang,Xin Cheng,Zhenxiang Cheng
The solid-state cooling technique utilizing electrocaloric (EC) materials is an alternative approach to tackle the greenhouse effect caused by traditional vapor-compression refrigeration. However, such a promising technique is severely hampered by the lack of proper materials considering that most existing EC materials with a single positive/negative EC effect exhibit a limited cooling effect. Here, the coexistence of a positive and negative EC effects has been achieved in a lead-free Na 0.5 Bi 0.5 (Ti 0.97 W 0.01 Fe 0.02 )O 3 ferroelectric film . A state-of-the-art positive adiabatic temperature change (Δ T ) of ~56 K accompanied by an isothermal entropy change (Δ S ) of ~64 J K −1 kg −1 at 143 °C and a large negative Δ T of ~ − 17 K with a Δ S of ~ − 24 J K −1 kg −1 at 55 °C are obtained under a strong electric field strength of 2692 kV cm −1 . Oxygen vacancy-related defect dipoles play a critical role in the negative EC effect at lower temperatures, while the phase transition is responsible for the positive EC effect at higher temperatures. Meanwhile, the film exhibits a high EC strength with a maximum Δ T /Δ E of 0.021 K cm kV −1 , together with a Δ S /Δ E of 0.024 J cm K −1 kg −1 kV −1 . This work ensures a giant total temperature change by utilizing and combining both the negative and positive EC effects in a dual cooling process.
研究领域:
材料科学
·
物理学
✓ 已验证
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
·
功能陶瓷
·
固态制冷
·
电介质物理
·
无铅压电材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 2
·117852
·
IF 6.2
Ying Zheng,Yifei Liang,Huanhuan Li,Quan Li,Yan Yan,Hua Tan,Haibo Zhang,Shenglin Jiang,Gang Liu
Electrocaloric cooling, a solid-state refrigeration technology utilizing the electrocaloric effect (ECE), enables miniaturized cooling systems. However, its practical application is constrained by limited adiabatic temperature change (Δ T ), restricted operating temperature span ( T span ), and the fact that peak performance typically occurs at elevated temperatures. To overcome this, (1-x)Ba₀.₇₆Sr₀.₂₄TiO₃-xCa(Ti₀.₉Sn₀.₁)O₃ (BST-CS) lead-free ferroelectric ceramics were synthesized via solid-state reaction, enhancing Δ T and T span through multi-ion doping. XRD and Raman spectroscopy confirmed tetragonal (T) and pseudo-cubic (PC) phase coexistence, with the PC phase increasing with doping. Temperature-dependent Raman and dielectric spectra revealed a tetragonal-cubic transition near the Curie temperature, contributing to the ECE. The optimized composition ( x = 0.14) achieved Δ T = 1.74 K and T span = 52 K (40–90°C, Δ T ≥ 80 % of Δ T max ) under 50 kV·cm −1 . Phase coexistence lowers polarization barriers, while grain refinement improves breakdown strength. This work advances eco-friendly microelectronics cooling by balancing performance and practicality.
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产品关联
DOI
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
·
高分子科学
·
固态制冷
·
纳米技术
·
电热效应
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）