Abstract
Thermal energy harvesting using non-linear pyroelectric effects in PZT with different Tc, PLZT, Ba(Zr0.2Ti0.8)O3 and (Ba0.8Sr0.2)TiO3 ceramics, and PMN-PT crystals were investigated. PLZT ceramics with Tc of 140°C exhibited large energy generation of 54.8 J/L/cycle with temperature variations from 30°C to 200°C and field variations from 0 to 20 kV/cm. Ba(Zr0.2Ti0.8)O3 ceramics with Tc of 40°C exhibited energy generation of 58.6 J/L/cycle with temperature variations from 30°C to 125°C and field variations from 0 to 20 kV/cm. The electrocaloric temperature changes ΔT due to applied ΔE were measured. PLZT(7/65/35) ceramics exhibited ΔT of 0.2 K at room temperature under a bipolar switching field of 20 kV/cm.
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