Article
Nanoscience & Nanotechnology
Chao Zhang, Zhanming Dou, Shizhi Zeng, Kanghua Li, Fangfang Zeng, Wenrong Xiao, Shiyong Qiu, Guifen Fan, Shenglin Jiang, Wei Luo, Qiuyun Fu, Guangzu Zhang
Summary: This study introduces low-radius Li+ into BaZr0.2Ti0.8O3 (BZT) through ion substitution engineering, leading to a change in internal lattice stress and a significant enhancement of the ferroelectric properties in BZT ceramics. Under the conditions of 333 K and 70 kV cm-1, the adiabatic temperature change of 5.7 mol% Li2CO3-doped BZT is 1.37 K, which is higher than that of pure BZT ceramics (0.61 K). Therefore, this work provides a simple but effective approach to design high-performance electrocaloric materials for next-generation refrigeration.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Le Van Lich, Xu Hou, Manh-Huong Phan, Tinh Quoc Bui, Jie Wang, Takahiro Shimada, Takayuki Kitamura, Van-Hai Dinh
Summary: By controlling the compositional gradient in thin films, the electrocaloric effect near room temperature can be improved, leading to different domain structure transitions at different temperatures and achieving enhanced performance. This study provides a new pathway for designing ferroelectric thin films with enhanced electrocaloric properties.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Qi Liu, Ying Dai, Xinkun Liu, Xinmei Pei, Wen Chen
Summary: The study enhanced the electrocaloric effect at room temperature in thin films containing iron, confirming the presence of an orthorhombic phase in the Fe-doped films and showing the highest relative content of the orthorhombic phase at x = 0.0075. The BZT-0.32BCT-xFe thin film exhibited superior properties at x = 0.0075, with a giant electrocaloric effect.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Xinkun Liu, Ying Dai, Xinmei Pei, Wen Chen
Summary: Lead-free Sr-doped BCZT thin films were successfully prepared and their structure, electric properties and ECE were investigated. The results show that the phase transition temperatures of the films change with increasing Sr content and merge at room temperature. The BCZT-0.05Sr film exhibits a giant ECE near room temperature.
CERAMICS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Jin Qian, Guohui Li, Kun Zhu, Guanglong Ge, Cheng Shi, Yang Liu, Fei Yan, Yanxia Li, Bo Shen, Jiwei Zhai, Zhenxiang Cheng
Summary: This study fabricates a series of ferroelectric thin films with unique polarization behavior, and the polarization behavior and phase transition temperature can be adjusted by doping with BZT. These thin films exhibit excellent performances in energy storage and electrocaloric refrigeration.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Deng Zou, Shiyuan Liu, Chao Zhang, Ying Hong, Guangzu Zhang, Zhengbao Yang
Summary: The study focused on the performance of compositionally graded PZT thin films in flexible piezoelectric nanogenerators, showing that upgraded PZT films outperform downgraded films in terms of voltage response and current density.
Article
Chemistry, Physical
Xian-Xiong Huang, Peng-Zu Ge, Tian -Fu Zhang, Qiu-Xiang Liu, Yan-Ping Jiang, Zhen-Hua Tang, Xiao-Bin Guo, Xin-Gui Tang
Summary: More and more researchers are studying the electrocaloric temperature change in polar materials caused by an applied electric field. This study focuses on Ba-doped PbHfO3 (PBH) films prepared by sol-gel method and investigates their components, microstructures, dielectric polarization, and electro-caloric effects (ECEs). The addition of Ba2+ transforms the PBH films from antiferroelectric (AFE) to ferroelectric (FE) and shifts their dielectric peaks towards lower temperatures. The maximum Delta T obtained in the Pb0.8Ba0.2HfO3 FE film is 41.1 K, an order of magnitude larger than the PbHfO3 film and Pb0.9Ba0.1HfO3 film. The Landau-Devonshire theory is employed to explain this phenomenon, suggesting that the rapid variation of energy barrier height near the phase transition temperature is beneficial for achieving large polarization change and high oT in solid-state cooling devices.
JOURNAL OF MATERIOMICS
(2023)
Article
Multidisciplinary Sciences
Xitao Liu, Zhenyue Wu, Tong Guan, Haidong Jiang, Peiqing Long, Xiaoqi Li, Chengmin Ji, Shuang Chen, Zhihua Sun, Junhua Luo
Summary: Most known electrocaloric materials exhibit poor cooling performance near room temperature, limiting their applications. The emerging family of hybrid perovskite ferroelectrics shows superior performance, offering an ideal platform for achieving room temperature solid-state refrigeration with large electrocaloric effects.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
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
Summary: By doping with zirconium ions, the performance of the electrocaloric effect (ECE) has been enhanced, thereby expanding its working temperature range, which is of great significance for the development of solid-state refrigeration technologies.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Wenyue Zhao, Ze Li, Zhao Wang, Yazhou Peng, Lei Shi, Wenjing Hua, Jie Wang, Lidong Wang, Wei-Dong Fei, Yu Zhao
Summary: In this study, large and regulable electrocaloric effects at room temperature are achieved in PbZrO3/Ca3Mn2O7 bilayer films based on PbZrO3 phase transition, and the sign of adiabatic temperature change, ΔT, is determined by Ca3Mn2O7 thickness. The formed PbZrO3-Ca3Mn2O7 heterojunction reduces the carrier concentration of the film and establishes a built-in electric field, greatly enhancing the withstanding voltage of the bilayer films. A maximum positive ΔT of 66.5 K is obtained in the bilayer film with a thin Ca3Mn2O7 layer, while a negative ΔT of -9.9 K is obtained with a thick Ca3Mn2O7 layer, both near room temperature. This work presents a simple and effective approach to designing huge electrocaloric effects based on antiferroelectric-containing multilayers near room temperature.
Article
Materials Science, Multidisciplinary
Zhonghua Li, Hong-Hui Wu, Junjie Li, Shihan Wang, Shiqiang Qin, Jingjin He, Chuanbao Liu, Yanjing Su, Lijie Qiao, Turab Lookman, Yang Bai
Summary: Hysteresis has an influence on the electrocaloric effect (ECE), affecting the reversibility of the ECE. In first-order phase transitions with hysteresis regions, a large ECE occurs, but the temperature span under zero field decreases with increasing electric field. In continuous electric field cycles, the thermal response of irreversible ECE decreases with subsequent changes in field, and electrical hysteresis loss leads to an increase in temperature.
Article
Materials Science, Ceramics
Hanting Dong, Jiangfeng Mao, Xiangjun Hui, Haiqing Du, Maojun Chen, Qi Ding
Summary: The dielectric properties of compositionally-graded BST thin films vary significantly depending on the substrate material, with films on Ti plates showing higher dielectric constant and tunability compared to those on stainless steel plates. Additionally, the gradient of the BST films also plays a crucial role in influencing their tunability, with up-graded films exhibiting higher tunability on Ti substrates. The results suggest that adjusting the compositional gradient can effectively modify the dielectric behavior of ferroelectric films.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Jie Chen, Biaolin Peng, Wenhong Sun
Summary: This study demonstrates that the negative EC effect of Mn-BTO thin films can be significantly improved by constructing nano-scaled rhombohedral phases. The use of SiN/p-GaN composite substrates instead of traditional Pt(111)/TiOx/SiO2/Si(100) substrates enhances the negative EC effect.
Article
Materials Science, Ceramics
Xiyu Ma, Wenjing Shi, Yule Yang, D. O. Alikin, Y. Ya Shur, Jinghui Gao, Xiaoyong Wei, Gang Liu, Hongliang Du, Li Jin
Summary: Electrocaloric refrigeration is an emerging solid-state technology with advantages of high efficiency, miniaturization, eco-friendliness, and low cost. This paper investigates Ba(Ti1-xSnx)O-3 ceramics and reveals their structural, dielectric, ferroelectric, electrocaloric, and electrostrictive characteristics. The results show that increasing Sn4+ concentration leads to lower dielectric peaks and a phase diagram is constructed based on dielectric characteristics. The study also demonstrates a giant adiabatic temperature change of 6.36 K in the x = 0.04 ceramic sample and temperature and composition-insensitive electrostrictive behavior.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Ruowei Yin, Junjie Li, Xiaopo Su, Shiqiang Qin, Chengye Yu, Yuxuan Hou, Chuanbao Liu, Yanjing Su, Lijie Qiao, Turab Lookman, Yang Bai
Summary: A multilayer ferroelectric structure with interlayer synergistic phase transitions is proposed to enhance the electrocaloric effect in ferroelectric materials, resulting in improved cooling performance for practical refrigeration applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
