Ferroelectric and Piezoelectric Properties of BiFeO₃‐Based Piezoelectric Ceramics

Abstract

Bismuth ferrite‐based bulk ceramics (1–x)Bi0.97Sm0.08FeO3–xBaTiO3 (BSF–xBT with x = 0.00 FC, x = 0.00 WQ, x = 0.01 WQ, x = 0.03 WQ, and x = 0.05 WQ, where FC is the furnace cooled and WQ is the water quenched) are synthesized by a conventional solid‐state reaction method followed by WQ process. The WQ procedure (compared with FC) dramatically improves the remnant polarization (Pr) of x = 0.00 ceramic from 11 to 21 μC cm−2. BT incorporation gradually reduces the coercive field (Ec) and Pr significantly enhances to 28.5 μC cm−2 (at x = 0.03) with fully saturated P–E hysteresis loops. The temperature‐dependent ferroelectric properties reveal that the corresponding Pr values improve with the rising temperature; this behavior may be related to the thermally activated domain walls motion. Symmetric and closed electromechanical strain–electric field (S–E) curves are obtained with a maximum strain of Smax = 0.05% for an optimum composition together with high charge sensor constant (d33 = 56 pC N−1). The structural and electrical properties of the investigated ceramics are presented in detail.

Influence of Various Physiochemical Parameters of AFeO3 (A = Bi, Er, Ga, La, Sm, Y) Fillers on the Dielectric, Ferroelectric, Energy Storage, and Mechanical Energy Harvesting Performance of PVDF

“…On the other hand, the obtained loops also suggested the ferroelectric nature of BFO and GFO, which supports previous literatures. [20,21]…”

Effect of Cooling Rate on the Crystalline Morphology of Bi2O3‐Fe2O3 Pseudo‐Binary System

“…Besides that, the phase formation and thermodynamics of BiFeO 3 crystals from the Bi 2 O 3 -Fe 2 O 3 pseudo-binary system have been extensively studied. [19][20][21][22][23] Meanwhile, the research on the morphological evolution of iron-sillenite Bi 25 FeO 40 single crystal from the Bi 2 O 3 -Fe 2 O 3 melt is still scarce. Therefore, investigating the growth mechanism to achieve high-quality single crystals is of great significance.…”

Lanthanum‐Induced Morphotropic Phase Boundary in BiFeO3–BaTiO3‐Based Lead‐Free Piezoelectric Ceramics

“…Therefore, in recent years, considerable efforts have been made by many researchers to develop lead-free high-temperature piezoelectric materials, especially those with relatively inexpensive raw materials, such as BiFeO 3 -BaTiO 3 (BF-BT)-based ceramics. [10][11][12][13][14] Regrettably, the practical use of BF-BT-based ceramics is hindered by low DC resistivity as well as poor piezoelectricity, although they possess an extremely high Curie temperature (T C ¼ 619 C). [15] It is found that both MnO 2 doping and Bi excess can raise the resistance of BF-BT, thereby making it polarizable.…”