Lead-free relaxor ferroelectric ceramics with high optical transparency and energy storage ability

Abstract

We prepared highly transparent relaxor ferroelectric ceramics based on (K0.5Na0.5)NbO3 using a pressure-less solid-state sintering method without using hot isostatic pressing and spark plasma sintering.

Improved transmittance and ferroelectric properties realized in KNN ceramics via SAN modification

“…At higher values of x , the ceramics continually display reduced grain size to approximately 0.2 μm. Similar results were also reported in a series of A(B'B”)O 3 ‐modifed KNN ceramics . Although several explanations have been proposed, the origin of such submicron‐grains in A(B'B”)O 3 ‐modified KNN ceramics is still unclear.…”

Lead‐free (K,Na)NbO3‐based ceramics with high optical transparency and large energy storage ability

“…The recoverable energy storage efficiency η is equal to the ratio of W rec to W total . The energy loss density W loss and the recoverable energy storage efficiency η are calculated by using the following equations:…”

“…However, almost all the KNN‐based ferroelectric ceramics examined in previous studies do not satisfy the requirement of both high optical transmittance and high energy storage density. Tables and show the visible optical transparency and energy storage density of most KNN‐based ceramics studied during the 2014‐2017 time period . It was found that transparent ferroelectric ceramics with high energy storage densities have rarely been created in previous studies.…”

“…The DBS depends on the grain size and porosity. A smaller grain size and the lower porosity lead to a higher DBS . In addition, relaxor ferroelectrics exhibit a higher P s and lower P r , and thus have a prominent effect on the energy storage density …”

Enhanced Energy‐Storage Properties of Lanthanum‐Doped Bi0.5Na0.5TiO3‐Based Lead‐Free Ceramics

“…To meet the demands for electrical energy‐storage capacitors in the field of pulsed power applications and the increasing demands of society, dielectric capacitors for high energy‐storage density devices have been widely investigated and have played a vital role, especially in ceramic capacitors . In comparison to batteries and other energy‐storage devices, ceramic capacitors possess a faster charge–discharge rate and superior mechanical and thermal properties . Thus, ceramic dielectric materials are considered to be the best potential candidates for pulsed capacitor applications.…”