scholarly journals Dielectric relaxation and charged domain walls in (K,Na)NbO3-based ferroelectric ceramics

2017 ◽  
Vol 121 (7) ◽  
pp. 074101 ◽  
Author(s):  
A. A. Esin ◽  
D. O. Alikin ◽  
A. P. Turygin ◽  
A. S. Abramov ◽  
J. Hreščak ◽  
...  
Keyword(s):  
Dielectric Relaxation ◽  
Domain Walls ◽  
Ferroelectric Ceramics

scholarly journals Piezoelectric Properties of SrBi4Ti4O15 Ferroelectric Ceramics

2002 ◽  
Vol 17 (6) ◽  
pp. 1376-1384 ◽  
Author(s):  
Marlyse Demartin Maeder ◽  
Dragan Damjanovic ◽  
Cyril Voisard ◽  
Nava Setter
Keyword(s):  
Piezoelectric Coefficient ◽  
Domain Walls ◽  
High Pressures ◽  
Elevated Temperatures ◽  
Piezoelectric Properties ◽  
Ferroelectric Ceramics ◽  
Piezoelectric Response ◽  
Low Frequencies ◽  
Sintering Conditions ◽  
Weak Fields

The dynamic piezoelectric response of SrBi4Ti4O15 ceramics with Aurivillius structure was investigated at high alternating stress, low frequencies (0.01 to 100 Hz), and temperatures from 20 to 200 °C. The piezoelectric nonlinearity, observed only at high pressures (>10 MPa) and elevated temperatures (>150 °C), is interpreted in terms of contributions from non-180° domain walls. At weak fields, the frequency dependence of the longitudinal piezoelectric coefficient was explained in terms of Maxwell–Wagner piezoelectric relaxation. The Maxwell–Wagner units are identified as colonies that consist of highly anisotropic grains which sinter together, and whose distribution in the ceramic is strongly dependent on sintering conditions.

Ferroelectric polarization and domain walls in orthorhombic (K1−xNax)NbO3 lead-free ferroelectric ceramics

2010 ◽  
Vol 96 (22) ◽  
pp. 221905 ◽  
Author(s):  
Ning Lu ◽  
Rong Yu ◽  
Zhiying Cheng ◽  
Yejing Dai ◽  
Xiaowen Zhang ◽  
...  
Keyword(s):  
Domain Walls ◽  
Lead Free ◽  
Ferroelectric Ceramics ◽  
Ferroelectric Polarization

scholarly journals Piezoelectric Nonlinearity and Hysteresis Arising from Dynamics of Electrically Conducting Domain Walls

2021 ◽  
Author(s):  
Tadej Rojac
Keyword(s):  
Experimental Data ◽  
Domain Walls ◽  
Ferroelectric Materials ◽  
Ferroelectric Ceramics ◽  
Bulk Conductivity ◽  
Electrically Conducting ◽  
Local Conductivity ◽  
External Stimuli ◽  
Complex Manner

Macroscopic nonlinearity and hysteresis observed in the piezoelectric and dielectric responses of ferroelectric materials to external stimuli are commonly attributed to localized displacements of domain walls (DWs). The link between the macroscopic response and microscopic DW dynamics is provided by the well-known Rayleigh relations, extensively used to quantify the electrical and electromechanical behavior of ferroelectric ceramics and thin films under subswitching conditions. In this chapter, I will present an intriguing case where DWs exhibit enhanced electrical conductivity with respect to the bulk conductivity. By combining experimental data and modeling, it will be shown that the local conductivity, related to accumulation of charged points defect at DWs, does not only affect DW dynamics through DW-defect pinning interactions, as we may expect, but goes beyond it by affecting the macroscopic nonlinearity and hysteresis in a more complex manner. The major characteristics and implications of the underlying nonlinear Maxwell-Wagner piezoelectric relaxation, triggered by the presence and dynamics of conducting DWs, will be presented, reviewed and discussed in the framework of systematic multiscale analyses on BiFeO3 ceramics. The result may have implications in the development of promising BiFeO3-based compositions for high-temperature piezoelectric applications.

Development of a Material Constitutive Model and Simulation Technique to Predict Nonlinearities in Piezoelectric Materials under Weak Electric Fields

2017 ◽  
pp. 271-303
Author(s):  
M. K. Samal
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Lead Zirconate Titanate ◽  
Domain Walls ◽  
Piezoelectric Materials ◽  
Experimental Results ◽  
Ferroelectric Ceramics ◽  
Rayleigh Law ◽  
Model And Simulation ◽  
Near Resonance

Piezoceramic materials exhibit different types of nonlinearities depending upon the magnitude of the mechanical and electric field strength in the continuum. Some of the nonlinearities observed under weak electric fields are: presence of superharmonics in the response spectra and jump phenomena etc. especially if the system is excited near resonance. It has also been observed by many researchers that, at weak alternating stress fields, the relationship between the piezoelectrically induced charge and applied stress in ferroelectric ceramics, has the same form as the Rayleigh law (for magnetization versus magnetic field) in ferromagnetic materials. Applicability of the Rayleigh law to the piezoelectric effect has been demonstrated for Lead Zirconate Titanate ceramics by many researchers and their experimental results indicate that the dominant mechanism responsible for piezoelectric hysteresis and the dependence of the piezoelectric coefficient on the applied alternating stress is the pinning of non-180° domain walls. In this chapter, the Rayleigh law for ferromagnetic hysteresis has been modified and incorporated in a nonlinear electric enthalpy function and then applied in the analysis of hysteresis behavior of piezoelectric continua. Analytical solutions have been derived for a cantilever beam actuated by two piezo-patches attached to the top and bottom of the beam and excited by opposite electric fields. Analysis has been carried out at different electric field excitations of varying amplitude and frequencies and the results have been compared with the available experimental results from literature.

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