Energy Harvesting Using PLZT and Lead-Free Ceramics and Their Piezoelectric Properties on the Nano-scale

Abstract

Vibration-electrical energy converters for energy harvesting based on the piezoelectric effect were investigated. The unimorph of PZT with a higher T c and Mndoped BaTiO 3 -based ceramics produced greater power and energy. Two unimorphs consisting of PZT (T c D 320 C) and Mn-0.2mol% doped BT ceramics produced 3493 mJ and 193 mJ. Thermal energy harvesting using nonlinear pyroelectric effects was investigated in PLZT ceramics with different T c and BT-based ceramics. PLZT(9.1/65/ 35) ceramics exhibited energy generation of 52J/L/cycle. Adiabatic temperature change (DT), due to electrocaloric effects was estimated from the polarization change. DT of 0.015 and 0.023K were estimated for BaTiO 3 and PLZT(9.1/65/35) ceramics.

Characterization of electrocaloric properties by indirect estimation and direct measurement of temperature–electric field hysteresis loops

“…The samples were cut into 3-5 mm squares, and their temperatures were changed by immersing them in a heated or cooled oil bath. 28) Strain-electric field (s-E) hysteresis loops of the samples at room temperature were measured using a combination of a programmable signal generator and a strain gauge. Triangular waves of 0.1 Hz with 30-40 kV=cm were applied to the samples in the P-E and s-E measurements.…”

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

“…BaTiO 3 ceramics were sintered from the commercial powders (Toda Kogyo). The powders were fired at 1225-1275°C for PLZT ceramics at 1300-1400°C for BaTiO 3 ceramics, respectively [20][21][22].…”

Ultra-large non-volatile modulation of magnetic moments in PbZr0.2Ti0.8O3/MgO/La0.7Sr0.3MnO3 heterostructure at room temperature via interfacial polarization mediation

“…La 0.7 Sr 0.3 MnO 3 (LSMO) is a half-metallic ferromagnetic material with a high spin polarization of nearly 100% and a high critical temperature Tc = 350 K 14 . PbZr 0.2 Ti 0.8 O 3 (PZT) is a ferroelectric material with a high remnant polarization (Pr ~ 71.9 μC/cm 2 ) 15 and a high Curie temperature (T C  = 320 °C) 16 . The ME coupling between LSMO and the PZT interface is complicated and interesting 10, 12, 17 .…”