Low DC Electric-Field-Induced Phase Transition in KTa_0.59Nb_0.41O₃ Crystal

Abstract

Cubic to tetragonal phase transition (P C–T) in relaxor ferroelectric KTa1–x Nb x O3 (x is the composition of Nb) occurs at room temperature and thus receives much attention due to its practical device applications. However, the mechanisms of electric-field-induced P C–T remain unclear due to the limited study and technical challenges. We study the P C–T process induced by low direct current (DC) electric field using KTa0.59Nb0.41O3 single crystal by detection of real-time Raman, relative permittivity, and ferroelectric domain. Several notable features indicating the P C–T process are observed in the Raman spectrum with application of the electric field. In addition, it is found that the electric-field-induced P C–T exists in a small temperature range, which is consistent with Landau–Devonshire (LD) phenomenological theory.

Discharge characteristics of pre‐polarized doped lead zirconate titanate under impact at room and high temperature

“…Just as relaxor ferroelectrics have Burns temperature, the ambient temperature is only 20°C higher than T c , which cannot fully satisfy depolarization condition. 27 The state changes of PZT under different temperatures and impacts can be represented by the model shown in Figure 9. The domain direction in unpolarized ferroelectric materials is chaotic.…”

Cu-Doping-Modified Order State, Ferroelectric Property, Multiscale Inhomogeneities, and Local Structure in the Relaxor KTa1–xNbxO3 Crystal

“…can reflect the static and dynamic behavior of the PNR. The dielectric permittivity stimulated by a small electric field mainly reveals the static feature of PNR motion . Further increasing the electric field, the dielectric response under a high AC electric field reflects the dynamic feature of PNR motion.…”