TY - GEN
T1 - The electrocaloric effect in BaTiO3thick film multilayer structure at high electric field
AU - Bai, Yang
AU - Ding, Kai
AU - Zheng, Guangping
AU - Shi, San-Qiang
AU - Qiao, Liejie
AU - Guo, Dong
PY - 2012/6/29
Y1 - 2012/6/29
N2 - We demonstrated the superior electrocaloric effect (ECE) in BaTiO3multilayer 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 °C, 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 °C under Vmax=25 V. The BaTiO3thick 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 BaTiO3is 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-free composition provides it a promising future in solid-state cooling technology.
AB - We demonstrated the superior electrocaloric effect (ECE) in BaTiO3multilayer 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 °C, 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 °C under Vmax=25 V. The BaTiO3thick 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 BaTiO3is 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-free composition provides it a promising future in solid-state cooling technology.
KW - Electrocaloric effect
KW - Ferroelectric ceramics
KW - Thick film
UR - http://www.scopus.com/inward/record.url?scp=84862737453&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.512-515.1304
DO - 10.4028/www.scientific.net/KEM.512-515.1304
M3 - Conference article published in proceeding or book
SN - 9783037854259
T3 - Key Engineering Materials
SP - 1304
EP - 1307
BT - High-Performance Ceramics VII
T2 - 7th China International Conference on High-Performance Ceramics, CICC-7
Y2 - 4 November 2011 through 7 November 2011
ER -