Electrocaloric Properties of (Pb,La)(Zr,Ti)O3 and BaTiO3 Ceramics

Abstract

The electrocaloric properties of (Pb,La)(Zr,Ti)O 3 (PLZT) and BaTiO 3 ceramics were investigated by the 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 ∆T due to electrocaloric effects was estimated from the polarization change of these samples. ∆Ts of 0.58 and 0.36 K were estimated for the (Pb,La)(Zr,Ti)O 3 (PLZT)(9.1/65/35) ceramics and BaTiO 3 ceramics sintered at 1400°C, respectively. The measured temperature changes ∆Ts in these samples upon the release of the electric field from 30 kV/cm to zero were 0.26 and 0.29 K, respectively.

Temperature dependences of the electromechanical and electrocaloric properties of Ba(Zr,Ti)O3and (Ba,Sr)TiO3ceramics

“…This value is the largest among the samples we measured thus far. 20,21,39,40) This temperature corresponds to a temperature around 10 °C higher than the phase transition temperature of 19 °C.…”

Electrocaloric properties of potassium tantalate niobate crystals

“…29) The estimated ΔT values were compared with the ΔT values directly measured. [29][30][31] The relationship between temperature and electric field (T-E) was investigated. The reports on T-E loops have been limited thus far; 29,32) however, T-E measurements of various materials are important to clarify the ECE in ferroelectric materials.…”