Enhanced Electrical Energy Storage Density in Mechanical Confined Antiferroelectric Ceramic

Abstract

This article reports the effect of compressive stresses on electrical energy storage density of Pb0.99Nb0.02 [(Zr0.57Sn0.43)0.94Ti0.06]0.98O3 (PNZST) antiferroelectric bulk ceramics. The increased energy density was obtained under uniaxial and radial compressive stresses. These have been explained in terms of dipolar reorientation associated with high field stimulus of ferroelectric materials. The polarization/depolarization and increment in energy density are found to be dependent on the crystallographic orientation, applied electric field and direction of stress. The results indicate that stress induced phase suppression can increase the storage density by ∼23% (75 MPa) and 17% (90 MPa) for uniaxial and radial compressive stresses, respectively. Maximum energy storage efficiency of ∼65% (75 MPa) and 85% (200 MPa) are observed in uniaxial and radial cases, respectively.