Effects of iron addition on electrical properties and aging behavior of barium titanate ceramics

Abstract

In this study, the influences of Fe addition on phase formation and electrical properties of Ba(Ti1 - xFex)O3 with x = 0 to 0.02 were investigated. In addition, aging behavior of the ceramics was also investigated. The XRD analysis showed that the crystal structure of Ba(Ti1 - xFex)O3 changed from tetragonal to hexagonal as Fe concentration increased to x = 0.015, causing a noticeable decrease in the dielectric properties. From ferroelectric hysteresis (P-E) loops measurements, with increasing Fe content the saturation polarization decreased, while the coercive electric field increased at low concentration (x ≤ 0.01) with tetragonal structure. At x ≥ 0.015, with paraelectric hexagonal phase, no P-E hysteresis loop was observed at room temperature. Room temperature aging study showed that the ferroelectric P-E hysteresis loops became constricted loops during aging in Ba(Ti1 - xFex)O3 with ferroelectric tetragonal phase. The dielectric constant also decreased during aging. Copyright © Taylor & Francis Group, LLC.