Electric-field-induced antiferroelectric to ferroelectric phase transition in mechanically confinedPb0.99Nb0.02[(

Abstract

Electric-field-induced antiferroelectric to ferroelectric phase transition in mechanically confined Pb0.99Nb0.02[(Zr0.57Sn0.43)0.94Ti0.06]0.98O3 AbstractThe electric-field-induced phase transition was investigated under mechanical confinements in bulk samples of an antiferroelectric perovskite oxide at room temperature. Profound impacts of mechanical confinements on the phase transition are observed due to the interplay of ferroelasticity and the volume expansion at the transition. The uniaxial compressive prestress delays while the radial compressive prestress suppresses it. The difference is rationalized with a phenomenological model of the phase transition accounting for the mechanical confinement. Keywords Aerospace Engineering Disciplines Ceramic Materials | Materials Science and Engineering | Structures and Materials CommentsThis article is from Physical Review B 81 (2010) The electric-field-induced phase transition was investigated under mechanical confinements in bulk samples of an antiferroelectric perovskite oxide at room temperature. Profound impacts of mechanical confinements on the phase transition are observed due to the interplay of ferroelasticity and the volume expansion at the transition. The uniaxial compressive prestress delays while the radial compressive prestress suppresses it. The difference is rationalized with a phenomenological model of the phase transition accounting for the mechanical confinement.

High temperature stress-induced “double loop-like” phase transitions in Bi-based perovskites

“…31 A characterizing parameter in antiferroelectricity is the critical electric field for induced ferroelectricity, which depends on composition, 32 temperature, 33 and stress state. 9 However, the electric field required for an AFE-FE phase transition in PZ increases with decreasing temperature leading to the classical double loop polarization-electric field loop only below the AFE-FE phase transition temperature, the opposite of that observed in BNT-6BT.…”

“…7 In the work by Takenaka et al, 4 the appearance of a pinched polarization-electric field hysteresis loop observed in polycrystalline BNT-5BT at elevated temperatures was taken to be the result of a FE-AFE transformation. However, considering that the pinching in polarization hysteresis can be caused by many different mechanisms such as relaxor to FE transition, 8 AFE to FE transition, 9 or severe aging in FEs, 10 the identity of the high temperature phase in the BNT− 100xBT system remains unclear.…”

Mechanical self-confinement to enhance energy storage density of antiferroelectric capacitors

“…12 Recently, the critical electric fields, E F for the antiferroelectric-to-ferroelectric phase transition and E A for the reverse transition, have been shown experimentally to be shifted to higher levels by uniaxial as well as radial compressive stresses in the ceramic composition system Pb 0.99 Nb 0.02 [(Zr 0.57 Sn 0.43 ) 1Ày Ti y ] 0.98 O 3 with y ¼ 0.06. 13 The increase in E F and E A corresponds to an increase in the energy storage density in antiferroelectric capacitors. 3,4 Therefore, mechanical confinements in the form of compressive stresses are beneficial where the energy density of antiferroelectric dielectrics is concerned.…”

“…However, the apparatuses that generate the mechanical stresses are too complicated to be directly implemented in real energy storage capacitors. [13][14][15][16] In this study, a simple scheme, termed selfconfinement, is proposed and tested for applying compressive stresses and increasing energy storage density.…”

Thermal analysis of phase transitions in perovskite electroceramics

“…Of all the antiferroelectric ceramics the most widely studied compositions are lead zirconate titanate stannate doped with minor amounts of niobium or lanthanum [5][6][7][8][9][10][11]. In particular, Pb 0.99 Nb 0.02 [(Zr 0.57 Sn 0.43 ) 1-y Ti y ] 0.98 O 3 (PNZST43/100y/2) shows promise for applications in high energy density capacitors because its antiferroelectric-ferroelectric transition can be easily manipulated and tuned [12,13].…”