Polarization switching dynamics and switchable diode effect in hybrid improper ferroelectric Ca3Ti2O7 ceramics

Published: February 08, 2019

Author(s)

Baoyuan Tong, Shouyu Wang, Winnie K. Wong-Ng, Xiongnan Zhang, Cong Hang, Hui Zhao, Weifang Liu

Abstract

Hybrid improper ferroelectricity (HIF) Ca3Ti2O7 (CTO) ceramics were synthesized by a solid- state reaction method. Their polarization switching currents, dynamic processes of polarization- switching, and leakage current properties were investigated. It was found that the dynamic polarization curves of CTO ceramics exhibit obvious dependence on the frequency of the driving electric fields. Moreover, CTO ceramics show a switchable diode effect. The underlying mechanism for the observed effects were proposed based on the interplaying between mobile charged defects and bound charges. The charged defects also lead to a decrease of the band gap of the CTO ceramic, as revealed by absorption spectrum analysis.
Citation: Journal of the American Ceramic Society
Volume: 102
Pub Type: Journals

Keywords

hybrid improper ferroelectric Ca3Ti2O7 ceramics, polarization-switching, polarization- switching, switchable diode effect, resistive switching mechanism
Created February 08, 2019, Updated March 25, 2019