The Electrocaloric Effect in BaTiO3 Thick Film Multilayer Structure at High Electric Field
We demonstrated the superior electrocaloric effect (ECE) in BaTiO3 multilayer structure.The sample fabricated by tape-casting process has 120 effective ferroelectric layers with average layer thickness of 1.7 μm.The ferroelectric hysteresis loops were measured in the temperature range from 30 to 180 ℃,and then the temperature dependences of ECE adiabatic temperature change and heat absorption were obtained according to Maxwell relation.A peak ECE adiabatic temperature change of 0.027 K/V and heat absorption of 0.36 J/g were observed near the ferroelectric phase transition at 125 ℃ under Vmax=25 V.The BaTiO3 thick film can sustain an external electric field (>500 kV/cm) several times higher than bulk ferroelectric ceramics (~30 kV/cm).Although the EC coefficient of BaTiO3 is much lower than lead-based ferroelectric ceramics,the ultrahigh working electric field endows it a large ECE,higher than that of most reported lead-based ferroelectric ceramics.In addition,the lead-flee composition provides it a promising future in solid-state cooling technology.
Ferroelectric ceramics Electrocaloric effect Thick film
Yang Bai Kai Ding Guang-Ping Zheng San-Qiang Shi Liejie Qiao Dong Guo
Key Laboratory of Environmental Fracture(Ministry of Education),University of Science and Technology Key Laboratory of Environmental Fracture(Ministry of Education),University of Science and Technology Department of Mechanical Engineering,Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong Institute of Acoustics,Chinese Academy of Sciences,Beijing,China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
1304-1307
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）