10:45 AM - 11:00 AM
[15a-D62-5] Electrocaloric Properties of K(Ta,Nb)O3 Crystals and BaTiO3-based Ceramics(II)
Keywords:ferroelectroics, electrocaloric effect
Electrocaloric properties of Potassium Tantalate Niobate (KTN) crystals were investigated by indirect estimation and direct measurement of temperature–electric field (T–E) hysteresis loops. The measured T-E loops showed a similar shape to strain–electric field (s–E) loops. The adiabatic temperature change deltaT due to electrocaloric effects was estimated to be 0.49 K under a field of 20 kV/cm from the polarization change of the sample. The measured temperature changes deltaTs in these sample upon the release of the electric field from 20 kV/cm to zero were 0.42 K. Temperature dependent of electromechanical and electrocaloric properties were also measured. The maximum performance was appeared at around phase transition temperature and the properties was relatively mild temperature dependent.