Journal ArticleDOI
Entropy‐change measurement of electrocaloric effect of BaTiO3 single crystal
Reads0
Chats0
TLDR
In this paper, a characterization method of entropy-change measurement for the study of the electrocaloric effect (ECE) was demonstrated, after the specific heat capacity was measured under different applied fields using a differential scanning calorimeter (DSC) accompanied with DC power supply.Abstract:
We demonstrated a characterization method of entropy-change measurement for the study of the electrocaloric effect (ECE). After the specific heat capacity was measured under different applied fields using a differential scanning calorimeter (DSC) accompanied with DC power supply, the electrocaloric ΔS was calculated from the temperature integral of specific heat capacities based on the basic definition of entropy. The ΔS–T curve of BaTiO3 single crystal showed a sharp peak around Tc, which increased gradually and shifted to higher temperature with the rise of applied field. A high ECE with ΔS = 1.9 J/kg K and ΔT = 1.6 K is achieved under a quite low field of 10 kV/cm. The results agreed with the thermodynamic calculation. It provides a direct, precise, and time-efficient method for the electrocaloric studies.read more
Citations
More filters
Journal ArticleDOI
Caloric materials near ferroic phase transitions
TL;DR: The resulting magnetocaloric, electrocaloric and mechanocaloric effects are compared here in terms of history, experimental method, performance and prospective cooling applications.
Journal ArticleDOI
Giant Electrocaloric Strength in Single-Crystal BaTiO3
Xavier Moya,Enric Stern-Taulats,S. Crossley,David González-Alonso,Sohini Kar-Narayan,Antoni Planes,Lluís Mañosa,Neil D. Mathur +7 more
TL;DR: Direct measurements of heat Q and temperature change Δ T are presented in single-crystal BaTiO 3 (BTO) near the ferroelectric phase transition at Curie temperature T C to address giant EC effects near nominally second-order transitions that are reversible at any temperature above the hysteretic transition regime.
Journal ArticleDOI
Giant Electrocaloric Response Over A Broad Temperature Range in Modified BaTiO3 Ceramics
Xiaoshi Qian,Hui-Jian Ye,Hui-Jian Ye,Ying Tang Zhang,Ying Tang Zhang,Haiming Gu,Xinyu Li,Clive A. Randall,Qiming Zhang,Qiming Zhang +9 more
TL;DR: In this article, a giant electrocaloric effect (ECE) near room temperature is reported in a lead-free bulk inorganic material, which exhibits relaxor ferroelectric response to near the invariant critical point.
Journal ArticleDOI
Electrocaloric Cooling Materials and Devices for Zero-Global-Warming-Potential, High-Efficiency Refrigeration
Junye Shi,Han Donglin,Li Zichao,Lu Yang,Sheng-Guo Lu,Zhifeng Zhong,Jiangping Chen,Qiming Zhang,Xiaoshi Qian +8 more
TL;DR: In this article, the authors present the recent advances in electrocaloric cooling technologies, from material improvements to device demonstrations, and evaluate the environmental impact and energy efficiency of the technology by the total effective warming impact and the material COP, respectively.
Journal ArticleDOI
Large room-temperature electrocaloric effect in lead-free BaHfxTi1−xO3 ceramics under low electric field
TL;DR: In this paper, the phase diagram of lead-free BaHf x Ti 1−x O 3 (BHT) ferroelectric ceramics was established, and the electrocaloric efficiency (ΔT/ΔE ǫ = 0.35°C under 10kV/cm) was reported.
References
More filters
Journal ArticleDOI
Giant Electrocaloric Effect in Thin-Film PbZr0.95Ti0.05O3
A. S. Mischenko,A. S. Mischenko,Qiming Zhang,Qiming Zhang,James F. Scott,James F. Scott,Roger W. Whatmore,Roger W. Whatmore,Neil D. Mathur,Neil D. Mathur +9 more
TL;DR: A giant electrocaloric effect is demonstrated in 350-nanometer PbZr0.95Ti0.05O3 films near the ferroelectric Curie temperature of 222°C, which may find application in electrical refrigeration.
Journal ArticleDOI
Large electrocaloric effect in ferroelectric polymers near room temperature.
TL;DR: It was determined that a large ECE can be realized in the ferroelectric poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] copolymer at temperatures above the feroelectric-paraelectric transition (above 70°C), where an isothermal entropy change of more than 55 joules per kilogram per kelvin degree and adiabatic temperature change were observed.
Journal ArticleDOI
Magnetic heat pumping near room temperature
TL;DR: In this article, it is shown that magnetic heat pumping can be made practical at room temperature by using a ferromagnetic material with a Curie point at or near operating temperature and an appropriate regenerative thermodynamic cycle.
Journal ArticleDOI
Electrocaloric Materials for Solid‐State Refrigeration
Sheng-Guo Lu,Qiming Zhang +1 more
TL;DR: The electrocaloric effect (ECE) in dielectric materials has great potential in realizing solid-state cooling devices with compact size and high efficiency, which are highly desirable for a broad range of applications as mentioned in this paper.
Journal ArticleDOI
Giant electrocaloric effect in the thin film relaxor ferroelectric 0.9 PbMg(1/3)Nb(2/3)O(3)-0.1 PbTiO(3) near room temperature
TL;DR: In this paper, the authors demonstrate a giant electrocaloric effect (5K in 25V) in 260nm sol-gel films of the relaxor ferroelectric 0.9PbMg1∕3Nb2∕ 3O3-0.1PbTiO3 near the Curie temperature of 60°C.