Stable macro-performance at extreme cold region for KNN-based ceramics with modified phase boundary

Abstract

High performance with good stability is important for practical application of electronic devices. As abundant researches related to the stability at room temperature and above have been adopted, the characteristic at extreme cold region is little concentrated on, impeding the development of plateau section. Herein, the stability of electrical properties is emphasized on at extreme cold region for the KNN ceramics with polycrystal phase boundary. Rhombohedral-orthorhombic (R-O) phase boundary is successfully formed from extreme cold region to room temperature. Notably, stable polarization is revealed with maintained R-O phase boundary. Little changed piezoelectric response is gained with modified R-O phase boundary, indicating that abundant O and lesser R phases coexistence is beneficial of improving temperature stability at extreme cold region. Thus, this work demonstrates a tool for optimizing performance at extreme cold region of lead-free ceramics, accelerating the application of electronic devices at plateau-climate regions.