Large electromechanical response in ferroelectrics: Beyond the morphotropic phase boundary paradigm

Large Piezoelectric Response in Lead-Free (Bi0.5Na0.5)TiO3-Based Perovskite Thin Films by Ferroelastic Domain Switching: Beyond the Morphotropic Phase Boundary Paradigm

“…The thermal strain is released at the phase transition temperature through the formation of multiple domains. , The domain structure formed at the Curie temperature almost persists upon cooling down to ambient temperature; however, the thermal strain again accumulates during this process. An application of a large electric field can release the accumulated thermal strain below the Curie temperature, inducing the formation of a fine domain structure. ,, This fine domain structure allows significant mobility, enhancing electromechanical coupling. ,, This fine domain structure is recognized to be crucial to the achievement of a large piezoelectric response in bulk ceramics and single crystalline materials. − …”

Decoding the Role of Diffused Multiphase Coexistence in Potassium Sodium Niobate-Based Ceramics with Nanodomains for Enhanced Piezoelectric Devices

“…That is to say, although the domain reversal ability was improved, the number of domains that could be effectively reoriented and preserved after poling was largely reduced because of the increased random field. 53 Therefore, the lower θ and decreased P r were observed in the sample with x = 0.04. Besides, the obvious back-switching of reoriented domains was also highly anticipated because of the increased random field (Figure 7b).…”

“…Thus, although the sample with x = 0.04 possessed easier domain switching and domain wall motion, the high content of the additives largely destroyed the long-range-ordered ferroelectric domains, resulting in difficulty in reaching the full reorientation of the domains even under a much higher electric field. That is to say, although the domain reversal ability was improved, the number of domains that could be effectively reoriented and preserved after poling was largely reduced because of the increased random field . Therefore, the lower θ and decreased P r were observed in the sample with x = 0.04.…”

Energy harvesting with flexible piezocomposite fabricated from a biodegradable polymer

“…In case PT–BNZ local scale disorder hinders long range ferroelectric ordering and leads to the formation of polar nano region 41‐47 . On application of electric field, these polar domains tend to grow which is reflected in extra‐ordinary electromechanical properties 48‐51 in such disorder relaxor ferroelectrics. The piezoelectric coefficient of our biodegradable polymer‐based PCL‐BST and PCL‐PT with 50 vol% ceramic filler showed very good piezoelectric coefficient 10 and 22 pC/N, respectively, which is comparable and even better in case of PCL‐PTBNZ to composites of well‐established polymer‐like PVDF with similar filler percentage 27,28 .…”