Evolution of electromechanical properties in Fe-doped (Pb,Sr)(Zr,Ti)O3 piezoceramics

Abstract

Defects in acceptor-doped perovskite piezoelectric materials have a significant impact on their electrical properties. Herein, the defect mediated evolution of piezoelectric and ferroelectric properties of Fe-doped (Pb,Sr)(Zr,Ti)O3 (PSZT-Fe) piezoceramics with different treatments, including quenching, aging, de-aging, and poling, was investigated systematically. Oxygen vacancies with a cubic symmetry are preserved in the quenched PSZT-Fe ceramics, rendering them robust ferroelectric behaviors. In the aged PSZT-Fe polycrystals, defect dipole between Fe dopant and oxygen vacancy has the same orientation with spontaneous polarization PS, which enables the reversible domain switching and hence leads to the emergence of pinched polarization hysteresis and recoverable strain effect. And the defect dipoles can be gradually disrupted by bipolar electric field cycling, once again endowing the aged materials with representative ferroelectric properties. For the poled PSZT-Fe polycrystals, the defect dipoles are reoriented to be parallel to the applied poling field, and an internal bias field aligning along the same direction emerges simultaneously, being responsible for asymmetric hysteresis loops.

Metal–Organic-Framework-Derived Ball-Flower-like Porous Co3O4/Fe2O3 Heterostructure with Enhanced Visible-Light-Driven Photocatalytic Activity

“…However, the minor peak at around 732.2 eV suggests that a little Fe 3+ was reduced to Fe 2+ along with the oxidation of Co 2+ to Co 3+ [19][20][21][22][23]. SEM images of the CF heterostructure are shown in Figure 2a-c.…”

“…It was revealed that Fe 3+ ions were still dominant, which corresponded to the Fe 2 O 3 phase. However, the minor peak at around 732.2 eV suggests that a little Fe 3+ was reduced to Fe 2+ along with the oxidation of Co 2+ to Co 3+ [ 19 , 20 , 21 , 22 , 23 ].…”

High piezoelectricity and low strain hysteresis in PMN–PT-based piezoelectric ceramics

“…Recent reports have demonstrated progress in enhancing piezoelectric properties through the introduction of rare earth elements into PMN-PT ceramics, while these results are obtained at the expense of a further reduced Curie temperature (nearly 50%) [7,9]. Soft doping promote domain wall movement and "hard" doping plays a reverse effect [30,31]. In lead-free piezoelectric ceramic systems, (Bi0.5Na0.5)ZrO3 (BNZ) has been widely adopted to regulate the MPB.…”

Dielectric, Ferroelectric, and High-Temperature Strain Behavior of Rare Earth Ce-Doped 0.67BiFeO3–0.33BaTiO3 Lead-Free Ferroelectric Ceramics

“…1 Zirconium titanate lead (PbZr 1−x Ti x O 3 ) ceramics, located at the morphotropic phase boundary (MPB), exhibit excellent piezoelectric performance and account for a significant portion of the piezoelectric market share. 2 However, lead-based piezoelectric ceramics are characterized by high toxicity, leading to environmental pollution and health risks. With increasing concern for environmental protection and health awareness, lead-based piezoelectric ceramics have been gradually replaced by leadfree alternatives.…”

“…Piezoelectric ceramics are widely used as electromechanical coupling materials in various piezoelectric devices, such as sensors, actuators, and transducers . Zirconium titanate lead (PbZr 1– x Ti x O 3 ) ceramics, located at the morphotropic phase boundary (MPB), exhibit excellent piezoelectric performance and account for a significant portion of the piezoelectric market share . However, lead-based piezoelectric ceramics are characterized by high toxicity, leading to environmental pollution and health risks.…”