Engineered domain configuration and piezoelectric energy harvesting in 0.7Pb(Mg1/3Nb2/3)O-3-0.3PbTiO(3) single crystals

Abstract

The performance of cantilever piezoelectric energy harvesters using three types of piezoelectric materials, relaxor ferroelectric 0.7Pb(Mg1/3Nb2/3)O-3-0.3PbTiO(3) (PMN-PT) single crystals oriented along the aOE (c) 110 > and aOE (c) 001 > directions, and a PZT-based ceramic, were investigated. The aOE (c) 110 > and aOE (c) 001 > oriented PMN-PT single crystals, which have a rhombohedral phase and spontaneous polarization along the aOE (c) 111 > direction, presented electromechanical coupling factor k (31)'s of 0.78 and 0.42, respectively. The cantilever-type energy harvester operated by 31 resonance mode generated a larger output power of 1.07 mW for the aOE (c) 110 > oriented PMN-PT single crystal compared to those of the other materials. The effective electromechanical coupling factor of the piezoelectric energy harvester with the aOE (c) 110 > oriented crystal also reached 0.25, not achievable with the other piezoelectric materials. These results demonstrate that the domain engineering of the piezoelectric single crystals can provide higher design flexibility for a tiny energy harvester.