Multifunctional behavior of acceptor-cation substitution at higher doping concentration in PZT ceramics

Abstract

The Fe-doped PZT, Pb (Zr, Ti) 1-x Fe x O 3 , ceramics have gathered plenty of attention because of the interplay of ferroelectric and ferromagnetic properties. In the present study, we report the properties of Pb(Zr 0.52 Ti 0.48) 1-x Fe x O 3 , x = 0, 0.05, 0.10, 0.15 and 0.20, prepared by conventional solid state reaction route with varying Fe 3+ doping concentrations. Study of X-ray diffraction patterns confirmed the tetragonal crystal structure with reduction in tetragonality and unit cell size with doping. It also showed formation of secondary magneto-plumbite phase at higher doping concentrations. The SEM micrographs exhibited decrease in grain size with increase in doping concentration (for x > 0.05). The increase in oxygen vacancies and the formation of secondary magneto-plumbite phase and Fe 3+-VO 2−-Fe 3+ defect dipole complexes introduced with the acceptor (Fe 3+) doping, caused clamping of the domain walls and hence reduced the room temperature dielectric constant as the doping concentration was increased. The coexistence of electrical polarization and magnetic moment at room temperature in all PFZT compositions confirmed the multiferroic characteristic in the ceramic samples. Electric polarization (P r) and coercive fields (E c) decreased with increase in Fe 3+ concentration in PFZT sample. However, magnetization (M) and magnetic coercive fields (E c) increased with the increasing Fe 3+ concentration due to the dominant effect of F-center exchange mechanism in Fe 3+-VO 2−-Fe 3+ and formation of ferromagnetic secondary magneto-plumbite phase.

Defect engineering for reduced large AC signal dielectric loss of PZT‐based hard piezoelectric ceramics

“…This can suppress the domain wall motion and reduce the dielectric loss. 7,8 However, single Fe doping critically reduces the piezoelectric properties and additional doping agents are required. For example, Ca 2+ is an excellent isovalent-doping cation that enters the A-site to replace Pb 2+ or Sr 2+ , and can promote lattice tailoring to improve the dielectric constant ε r and piezoelectric coefficient d 33 , with no significant influence on the dielectric loss.…”

“…Preceramic polycarbosilane polymers are commonly used as precursors to make ceramic fibers 10,39 and ceramic matrix. [7][8][9]40,41 The chemical and volume changes that accompany ceramization of the polymer during pyrolysis have been documented in several studies. For example, see Refs [39][40][41][42].…”

Effect of Sr and La co-doping on structural and electrical properties of RF sputtered PZT thin films

“…The composition, near morphotropic phase boundary (MPB), is the best choice for various MEMS such as accelerometer [4], hydrophone [5], acoustic imaging [6], RF MEMS [7] etc. Improvements in piezoelectric and ferroelectric properties of PZT are reported to further enhance the performance of MEMS by adding dopants in PZT thin films [8][9][10][11][12], particularly for acoustic devices, where higher piezoelectric charge coefficient and moderate dielectric constant are essential for getting better receiving sensitivity.…”

Microstructure and Properties of PZT Films with Different PbO Content—Ionic Mechanism of Built-In Fields Formation

“…Some oxides, e.g., PbO, TiO 2 , ZrO 2 , that are part of PZT have unique electrophysical and mechanical characteristics and a nanoscale structure in the case of the formation of thin layers [5,6,7,8]. PZT is interesting because it allows almost all applications of ferroelectrics to be covered due to the fact that, depending on the composition [9] and the alloying additives [10,11], it is possible to synthesize PZT with varied physical properties and material parameters over a very wide range while adapting them to the requirements of the specific practical application. Such properties are associated with high dielectric permeability and residual polarization, a large number of transition cycles, high breakdown voltage, pyroelectric and piezoelectric effects, electro-optical phenomena, photoelectricity, etc.…”

“…The variety of studies to control the properties and the structure of PZT based films can be divided into several branches. The first is to control the properties and the structure of PZT films by manipulating their stoichiometry and impurities [10,11]. The second is the production of epitaxial films [16].…”