TY - GEN
T1 - Ferroelectric-to-ferroelectric phase transition induced electro-caloric energy conversion in barium titanate at room temperature
AU - Ding, K.
AU - Zheng, Guangping
AU - Shen, Y.
PY - 2012/11/1
Y1 - 2012/11/1
N2 - The electro-caloric (EC) energy conversions in single-crystal and polycrystalline barium titanate samples are investigated using differential scanning calorimetry (DSC). The DSC measurement reveals a refrigeration effect of 0.1 J/g under an electric field of 15 kV/cm at T=17.5 °C, which is related with the ferroelectric-to-ferroelectric transition in barium titanate. The thermodynamics calculation based on Maxwell's relations leads to similar conclusion. Such EC effect shows relaxation with the heat release process more significant than the heat adsorption process when the applied field is switched, which is different with those occur near the ferroelectric- to-paraelectric transition temperatures. Furthermore, the electro-caloric energy conversion relation or the scaling relation between the maximum refrigeration effect ΔHmaxand the applied field E, is found to follow a power law ΔHmax∼Ebwith b=1.72, which is significantly larger than those for EC effects related with the ferroelectric-to-paraelectric transitions.
AB - The electro-caloric (EC) energy conversions in single-crystal and polycrystalline barium titanate samples are investigated using differential scanning calorimetry (DSC). The DSC measurement reveals a refrigeration effect of 0.1 J/g under an electric field of 15 kV/cm at T=17.5 °C, which is related with the ferroelectric-to-ferroelectric transition in barium titanate. The thermodynamics calculation based on Maxwell's relations leads to similar conclusion. Such EC effect shows relaxation with the heat release process more significant than the heat adsorption process when the applied field is switched, which is different with those occur near the ferroelectric- to-paraelectric transition temperatures. Furthermore, the electro-caloric energy conversion relation or the scaling relation between the maximum refrigeration effect ΔHmaxand the applied field E, is found to follow a power law ΔHmax∼Ebwith b=1.72, which is significantly larger than those for EC effects related with the ferroelectric-to-paraelectric transitions.
KW - Calorimetry
KW - Electro-caloric effect
KW - Energy conversion
KW - Lead-free ferroelectrics
UR - http://www.scopus.com/inward/record.url?scp=84867977141&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.519.10
DO - 10.4028/www.scientific.net/KEM.519.10
M3 - Conference article published in proceeding or book
SN - 9783037854617
T3 - Key Engineering Materials
SP - 10
EP - 13
BT - Materials for Energy Conversion and Storage
T2 - 2012 International Workshop on Materials for Energy Conversion and Storage
Y2 - 23 March 2012 through 25 March 2012
ER -