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

Hiroshi Maiwa

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Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/61926

#### **Abstract**

The electrocaloric properties of (Pb,La)(Zr,Ti)O3 (PLZT) and BaTiO3 ceramics were inves‐ tigated 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 esti‐ mated for the (Pb,La)(Zr,Ti)O3 (PLZT)(9.1/65/35) ceramics and BaTiO3 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.

**Keywords:** Electrocaloric effect, PLZT, BaTiO3, refrigerator
