Article
Chemistry, Physical
V. S. Bondarev, E. A. Mikhaleva, M. V. Gorev, I. N. Flerov
Summary: The study found that the sensitivity of phase transition temperature to electric field in (NH4)(2)SO4 is very low, leading to a low maximum value of electrocaloric effect. However, the extensive electrocaloric response was relatively large, as shown by the analysis of the entropy-temperature-electric field phase diagram.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Multidisciplinary
Evgeniy Dul'kin, Antoni Kania, Michael Roth
Summary: (1-x)PbMg1/3Nb2/3O3-xPbTiO(3), [100]-oriented relaxor ferroelectric crystals were studied with dielectric and acoustic emission methods under high temperature and electric field conditions, successfully detecting phase transitions and revealing different temperature-field dependencies.
Article
Physics, Applied
A. P. Moina
Summary: Using a previously developed model, the study explores the electrocaloric effect (ECE) in antiferroelectric crystals of squaric acid, which undergoes a two-stage process with an intermediate ferrielectric phase during low-temperature polarization reorientation induced by an external electric field. The T-E landscape of the model entropy is analyzed. The ECE is found to be negative in the antiferroelectric phase, positive at low fields in the ferrielectric phase, and positive at all temperatures and fields in the ferroelectric phase. A negative EC temperature shift ΔT of approximately -2.7 K at 200 kV/cm is predicted. The supercritical behavior of the Gruneisen parameter in the crossover region between two bicritical end points is also studied.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Xiaolin Huang, Peng Tan, Yu Wang, Yao Zhang, Xing Wen, Guanchao Wang, Zhongxiang Zhou, Hao Tian
Summary: This study provides an effective approach to improving the EC performance of ferroelectrics with pronounced anisotropy by investigating the impact of anisotropic domain responses on the electrocaloric effect.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Physical
Yun Ou, Chihou Lei, Dongliang Shan
Summary: This study investigates the electrocaloric effect of BaZr0.15Ti0.85O3 single crystals with different orientations using entropy analysis and nonlinear thermodynamic approach. The results show that (111)-oriented crystals exhibit a more significant electrocaloric response, leading to a larger electrocaloric effect in a wider temperature range. These findings provide insights for enhancing the electrocaloric response of ferroelectric single crystals.
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)
Article
Materials Science, Multidisciplinary
Zhijun Jiang, Bin Xu, Sergey Prosandeev, Yousra Nahas, Sergei Prokhorenko, Jorge Iniguez, L. Bellaiche
Summary: An atomistic effective Hamiltonian is applied to calculate electrocaloric effects in rare-earth-substituted BiFeO3 multiferroics, followed by the development of a phenomenological model to interpret these calculations. The model suggests that the electrocaloric coefficient is determined by two terms involving electric quantities and the antiferromagnetic order parameter.
Article
Chemistry, Physical
Yueping Wang, Cong Liu, Honglin Wang, Zongbin Li, Jinwei Li, Bo Yang, Haile Yan, Liang Zuo
Summary: This study systematically investigated the orientation dependence of superelasticity and elastocaloric effect in a Cu71.3Al17.5Mn11.2 single crystal. The results showed that the <001>(A) orientation can yield the largest transformation strain, the lowest transformation stress, and the most remarkable elastocaloric response.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Magdalena Krupska-Klimczak, Irena Jankowska-Sumara, Przemyslaw Gwizd, Marceli Koralewski, Andrzej Soszynski
Summary: In this study, the ferroelectric properties of Pb5Ge3O11 single crystals modified by Ba ions were investigated. The measurements showed that Ba doping significantly affected all the measured parameters, resulting in the lowering of Curie temperature, gradual diffusion of phase transition, and decrease in polarization values and coercive field. The overall electrocaloric effect (ECE) decreased due to the reduction in polarization. However, the expanded range of phase transition occurrence (up to 30 K) could be beneficial for applications.
Article
Materials Science, Multidisciplinary
I. N. Zakharchenko, M. V. Talanov
Summary: Multicomponent ceramics based on the PbMg1/3Nb2/3O3-PbTiO3 system were studied using X-ray diffraction at high electric fields. It was found that a phase transition from a pseudocubic phase to a tetragonal phase occurs at electric fields higher than 5 kV/cm. Analysis of the X-ray peak intensities revealed the parameters of the tetragonal unit cell and the degree of domain orientation at a specific electric field. The results of X-ray diffraction studies were consistent with the macroscopic responses observed in strain, polarization, and dielectric permittivity.
Article
Chemistry, Multidisciplinary
Junjie Li, Hong-Hui Wu, Jianting Li, Xiaopo Su, Ruowei Yin, Shiqiang Qin, Dong Guo, Yanjing Su, Lijie Qiao, Turab Lookman, Yang Bai
Summary: The study presents a complex perovskite antiferroelectric material, PbMg0.5W0.5O3, with giant positive and negative electrocaloric effects near room temperature, suitable for refrigeration applications. This material exhibits large enthalpy change and symmetric peaks of ΔT at 36 degrees Celsius, showing potential for improved cooling efficiency and practical applications.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Ceramics
Ning Xu, Qi Liu, Zixiong Sun, Jiahui Ma, Yuxin Luo, Yongping Pu
Summary: The doping of La3+ improves the temperature stability of Ba1-xLaxTi0.9Sn0.1O3 ceramics near room temperature, enhances diffuse phase transition, and boosts the performance of ECE.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Kailun Zou, Cancan Shao, Peijia Bai, Chao Zhang, Ying Yang, Rundong Guo, Houbing Huang, Wei Luo, Rujun Ma, Yong Cao, Aixiang Sun, Guangzu Zhang, Shenglin Jiang
Summary: Cooling based on the electrocaloric effect (ECE) is a promising solution to environmental and energy efficiency problems in vapor-compression refrigeration. In this study, the orientation of Ba0.67Sr0.33TiO3 nanofibers (BST nfs) in a ferroelectric polymer-ceramics nanocomposite was adjusted to achieve a large EC effect. The results showed that the EC strength of the blends surpassed advanced nano-composites and was comparable to ferroelectric ceramics.
Article
Engineering, Electrical & Electronic
Li-Qian Cheng, Guozheng Jiang, Zhenhua Ma, Ze Xu, Minghao Yu, Jingtong Lu, Kai Chen
Summary: Al-doped BaZr0.2Ti0.8O3 ceramics with tailored phase transition relaxation were prepared. Al2O3 doping induced changes in Curie temperature and dielectric properties. Enhanced electrocaloric response and wide working temperature range were achieved with specific Al2O3 doping.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Junjie Li, Zhonghua Li, Jingjin He, Yuxuan Hou, Yanjing Su, Lijie Qiao, Yang Bai
Summary: This study focuses on the phase transition and ferroelectric properties in -oriented barium titanate single crystal, demonstrating promising applications in practical electrocaloric effect. The first-order ferroelectric-ferroelectric phase transition plays a key role in enhancing the electrocaloric effect for solid-state refrigeration near room temperature.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
