Enhanced ferroelectric properties and thermal stability of Mn‐doped 0.96(Bi_0.5 Na_0.5)TiO₃‐0.04BiAlO₃ ceramics

Abstract

(Bi0.5Na0.5)TiO3–BiAlO3 lead‐free materials exhibit excellent ferroelectric properties, but its depolarization temperature is relatively low which is the major obstacle limiting the material's practical application. In this study, the effects of Manganese (Mn) modification on the microstructure, ferroelectric properties and depolarization behavior of 0.96(Bi0.5Na0.5)(Ti1−xMnx)O3–0.04BiAlO3 ceramics were investigated. It was found that the average grain size was enlarged and ferroelectric properties were enhanced with small Mn addition, meanwhile the tangent loss decreased. The remnant polarization (Pr) of the samples reached an optimal value (~41 μC/cm2) as Mn content increased up to 0.7 mol%, whereas further addition resulted in the decrease in Pr. Moreover, appropriate Mn addition (x=0.7%) can improve the depolarization temperature from 140°C to 161°C determined from thermally stimulated depolarization currents measurement.

Enhanced pyroelectric properties in (Bi0.5Na0.5)TiO3–BiAlO3–NaNbO3 ternary system lead‐free ceramics

“…The patterns reveal that all the samples are crystallized into a pure perovskite structure. A small reflection peak can be noted around 2θ = 38.5°, which should be attributed to a superlattice refraction induced by oxygen octahedral tilting . To clearly present the effect of NN addition on the phase structure of ceramics, the enlarged patterns of (111) and (200) peaks are given in Figure B and C, respectively.…”

“…can be noted around 2h = 38.5°, which should be attributed to a superlattice refraction induced by oxygen octahedral tilting. 33 To clearly present the effect of NN addition on the phase structure of ceramics, the enlarged patterns of (111) and (200) peaks are given in Figure 1B and C, respectively. The split (111) peak and the single (200) peak indicate the nature of the rhombohedral phase.…”

Structure variation and energy storage properties of acceptor‐modified PBLZST antiferroelectric ceramics

“…For the peak at 653.4 eV, it is coincident with Mn 2+ 2p1/2 and Mn 3+ 2p1/2. The radii of Mn ions vary with different valence states: Mn 4+ (0.53/0.54), Mn 3+ (0.62/0.65/0.65), Mn 2+ (0.83/0.72), while the radii of Zr 4+ (0.79), Sn 4+ (0.71), Ti 4+ (0.605/0.61) differ . The calculated values of lattice parameters a, b and c are listed in Table .…”

High performance Bi0.5Na0.5TiO3-BiAlO3-K0.5Na0.5NbO3 lead-free pyroelectric ceramics for thermal detectors

“…26 As temperature increases, three anomalies can be detected, similar to previous reports. 27 The first characteristic temperature T F-R can be determined by the frequency-independent dielectric loss peak and dielectric constant inflection point at 118 C, which denotes the transition from ferroelectric to the ergodic relaxor (FE-ER) phase with increasing temperature, as supported by the temperature dependent polarization hysteresis measurements in Fig. 2(b) and the TEM study.…”