scholarly journals F-center mechanism of long-term relaxation in lead zirconate-titanate-based piezoelectric ceramics. 1. After-heating relaxation

2015 ◽  
Vol 05 (04) ◽  
pp. 1550036 ◽  
Author(s):  
V. M. Ishchuk ◽  
D. V. Kuzenko
Keyword(s):  
Electric Field ◽  
Lead Zirconate Titanate ◽  
Oxygen Vacancies ◽  
External Action ◽  
Lead Zirconate ◽  
Uniaxial Pressure ◽  
Relaxation Processes ◽  
F Center ◽  
Long Time ◽  
Dc Electric Field

Results of experimental investigation of relaxation aging processes in Pb(Zr,Ti)O3-based solid solutions after termination of external actions are presented. Heating, DC electric field, uniaxial pressure and some of their combinations were taken as external actions. In the main part of the present paper, we use heating as external action. The said processes are long-time one and are described by the logarithmic function of time.Reversible and nonreversible relaxation processes take place depending on the action intensity. The relaxation rate depends on the action intensity also, and the said dependence has nonlinear and nonmonotonic form if external action leads to domain disordering.The oxygen vacancies-based model for description of the long-time relaxation processes is suggested. The model takes into account oxygen vacancies on the sample’s surface ends, their conversion into [Formula: see text]- and [Formula: see text]-centers under external effects (due to the liberation of the pyroelectric charge) and subsequent relaxation of these centers into the simple oxygen vacancies after the actions termination. The initial sample’s state is electroneutrality one. F-center formation leads to the violation of the original sample’s electroneutrality, and generates DC electric field into the sample. Relaxation of F-centers is accompanied by decreasing of electric field, induced by them, and dielectric constant relaxation as consequent effect.

scholarly journals F-centers mechanism of long-term relaxation in lead zirconate-titanate based piezoelectric ceramics. 2. After-field relaxation

2016 ◽  
Vol 06 (03) ◽  
pp. 1650019 ◽  
Author(s):  
V. M. Ishchuk ◽  
D. V. Kuzenko
Keyword(s):  
Dielectric Constant ◽  
Electric Field ◽  
Lead Zirconate Titanate ◽  
Oxygen Vacancies ◽  
Lead Zirconate ◽  
Relaxation Processes ◽  
Logarithmic Function ◽  
External Effects ◽  
Dc Electric Field

The paper presents results of experimental study of the dielectric constant relaxation during aging process in Pb(Zr,Ti)O3based solid solutions (PZT) after action of external DC electric field. The said process is a long-term one and is described by the logarithmic function of time. Reversible and nonreversible relaxation process takes place depending on the field intensity. The relaxation rate depends on the field strength also, and the said dependence has nonlinear and nonmonotonic form, if external field leads to domain disordering. The oxygen vacancies-based model for description of the long-term relaxation processes is suggested. The model takes into account the oxygen vacancies on the sample's surface ends, their conversion into [Formula: see text]- and [Formula: see text]-centers under external effects and subsequent relaxation of these centers into the simple oxygen vacancies after the action termination. [Formula: see text]-centers formation leads to the violation of the original sample's electroneutrality, and generate intrinsic DC electric field into the sample. Relaxation of [Formula: see text]-centers is accompanied by the reduction of the electric field, induced by them, and relaxation of the dielectric constant, as consequent effect.

Effect of Ferroelectric Domain on Fatigue Fracture Behavior in Piezoelectric Ceramics

2013 ◽  
Vol 566 ◽  
pp. 3-6
Author(s):  
Motonori Nakamura ◽  
Chiharu Sakaki ◽  
Masahiko Kimura ◽  
Takehiro Konoike ◽  
Hiroshi Takagi ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Electric Field ◽  
Lead Zirconate Titanate ◽  
Domain Switching ◽  
Paraelectric Phase ◽  
Lead Zirconate ◽  
Fatigue Tests ◽  
Ferroelectric Ceramics ◽  
Pzt Ceramics ◽  
Dc Electric Field

Fatigue tests on lead zirconate titanate (PZT) were performed by using single-edge-V-notched specimens under cyclic mechanical loading with or without superposition of a DC electric field. Fatigue life was prolonged by applying a DC electric field to the PZT ceramics. To estimate the domain contribution, fatigue tests on barium strontium titanate (BST) ceramics in both ferroelectric and paraelectric phase were carried out. The fatigue life of the ferroelectric phase was much shorter than that of the paraelectric phase. Comparing the fatigue lives of two PZT ceramics with different values of coercive electric field (Ec) revealed that the fatigue life of the PZT with higher Ec is about one order of magnitude longer than that with lower Ec when the stress-intensity factor of fatigue test is low. It is therefore concluded that non-180°domain switching probably deteriorates the fatigue life of ferroelectric ceramics.

Mathematical model to predict the characteristics of polarization in dielectric materials: The concept of piezoelectrcity and electrostriction

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Mathematical Model ◽  
Electric Field ◽  
Lead Zirconate Titanate ◽  
Dielectric Material ◽  
Strain Curve ◽  
Dielectric Materials ◽  
Lead Zirconate ◽  
Simulation Software ◽  
Constitutive Law ◽  
Basic Material

Model was developed for the prediction of polarization characteristics in a dielectric material exhibiting piezoelectricity and electrostriction based on mathematical equations and MATLAB computer simulation software. The model was developed based on equations of polarization and piezoelectric constitutive law and the functional coefficient of Lead Zirconate Titanate (PZT) crystal material used was 2.3×10-6 m (thickness), the model further allows the input of basic material and calculation of parameters of applied voltage levels, applied stress, pressure, dielectric material properties and so on, to generate the polarization curve, strain curve and the expected deformation change in the material length charts. The mathematical model revealed that an application of 5 volts across the terminals of a 2.3×10-6 m thick dielectric material (PZT) predicted a 1.95×10-9 m change in length of the material, which indicates piezoelectric properties. Both polarization and electric field curve as well as strain and voltage curve were also generated and the result revealed a linear proportionality of the compared parameters, indicating a resultant increase in the electric field yields higher polarization of the dielectric materials atmosphere.

Correlations Among Degradations in Lead Zirconate Titanate thin Film Capacitors

1993 ◽  
Vol 310 ◽  
Author(s):  
In K. Yoo ◽  
Seshu B. Desu ◽  
Jimmy Xing
Keyword(s):  
Thin Film ◽  
Leakage Current ◽  
Lead Zirconate Titanate ◽  
Oxygen Vacancies ◽  
Lead Zirconate ◽  
Electrical Degradation ◽  
Zirconate Titanate ◽  
Thin Film Capacitors ◽  
Pzt Thin Film ◽  
Degradation Properties

AbstractMany attempts have been made to reduce degradation properties of Lead Zirconate Titanate (PZT) thin film capacitors. Although each degradation property has been studied extensively for the sake of material improvement, it is desired that they be understood in a unified manner in order to reduce degradation properties simultaneously. This can be achieved if a common source(s) of degradations is identified and controlled. In the past it was noticed that oxygen vacancies play a key role in fatigue, leakage current, and electrical degradation/breakdown of PZT films. It is now known that space charges (oxygen vacancies, mainly) affect ageing, too. Therefore, a quantitative ageing mechanism is proposed based on oxygen vacancy migration under internal field generated by either remanent polarization or spontaneous polarization. Fatigue, leakage current, electrical degradation, and polarization reversal mechanisms are correlated with the ageing mechanism in order to establish guidelines for simultaneous degradation control of PZT thin film capacitors. In addition, the current pitfalls in the ferroelectric test circuit is discussed, which may cause false retention, imprint, and ageing.

De-aging of Fe-doped lead-zirconate-titanate ceramics by electric field cycling: 180°- vs. non-180° domain wall processes

2012 ◽  
Vol 112 (3) ◽  
pp. 034103 ◽  
Author(s):  
Julia Glaum ◽  
Yuri A. Genenko ◽  
Hans Kungl ◽  
Ljubomira Ana Schmitt ◽  
Torsten Granzow
Keyword(s):  
Domain Wall ◽  
Electric Field ◽  
Lead Zirconate Titanate ◽  
Lead Zirconate ◽  
Zirconate Titanate ◽  
Field Cycling ◽  
Titanate Ceramics

Electric field forced phase switching in La‐modified lead zirconate titanate stannate thin films

1994 ◽  
Vol 75 (3) ◽  
pp. 1699-1704 ◽  
Author(s):  
K. G. Brooks ◽  
J. Chen ◽  
K. R. Udayakumar ◽  
L. E. Cross
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Lead Zirconate Titanate ◽  
Lead Zirconate ◽  
Phase Switching ◽  
Zirconate Titanate

Unveiling Center‐Type Topological Defects on Rosettes of Lead Zirconate Titanate Associated to Oxygen Vacancies

2021 ◽  
pp. 2100219
Author(s):  
Itamar T. Neckel ◽  
Francisco M. C. da Silva ◽  
Eduardo B. Guedes ◽  
Carlos S. B. Dias ◽  
Marcio M. Soares ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
Oxygen Vacancies ◽  
Topological Defects ◽  
Lead Zirconate ◽  
Zirconate Titanate

Uniaxial Compressive Stress Dependence of the High-Field Dielectric and Piezoelectric Performance of Soft PZT Piezoceramics

2004 ◽  
Vol 19 (3) ◽  
pp. 834-842 ◽  
Author(s):  
Dayu Zhou ◽  
Marc Kamlah ◽  
Dietrich Munz
Keyword(s):  
Electric Field ◽  
Lead Zirconate Titanate ◽  
Domain Switching ◽  
Lead Zirconate ◽  
Transverse Strain ◽  
Dissipation Energy ◽  
Depolarization Effect ◽  
Uniaxial Compressive Stress ◽  
Piezoelectric Performance ◽  
Electromechanical Load

The influence of uniaxial prestress on dielectric and piezoelectric performance was studied for soft lead zirconate titanate piezoceramics. High electric field induced polarization and longitudinal/transverse strain were measured at different compression preload levels of up to −400 MPa. The parameters evaluated included polarization/strain outputs, dielectric permittivity, piezoelectric constants, and dissipation energy as a function of the mechanical preload and electric-field strength. The results indicate a significant enhancement of the dielectric and piezoelectric performance within a certain prestress loading range. At much higher stress levels, the predominant mechanical depolarization effect makes the material exhibit hardly any piezoeffect. However, the enhanced performance achieved by a small stress preload is accompanied by an unfavorable increased hysteresis, and consequently, increased energy loss, which is attributed to a larger extrinsic contribution due to more non-180° domain switching induced by the combined electromechanical load.

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