Journal ArticleDOI
Coercive force and 90° domain wall motion in ferroelectric PLZT ceramics with square hysteresis loops
TLDR
In this article, a reported theory originally derived for rhombohedral-phase PLZT 6/65/35 ceramics is shown to be applicable to tetragonal-phase polyhedral-plzT 6.1/35 (PLZT6/65)/35 (P6/35)-ceramics also by introducing the remanent degree of 90° domain alignment γ90.Abstract:
The polarization reversal of some tetragonal-phase PLZT ceramics is studied. The results are explained in terms of 90° domain wall motions. A reported theory originally derived for rhombohedral-phase PLZT 6/65/35 ceramics is shown to be applicable to tetragonal-phase PLZT ceramics also by introducing the remanent degree of 90° domain alignment γ90. As a result, the calculation of coercive force is possible for various PLZT compositions considering the interaction of 90° domain wall motions and reacting forces established by the internal stress state of ferroelectric ceramics. The frequency dependence of coercive force and measurements of switching strain, including depolarization data obtained from either mechanically or electrically produced external forces, confirm the interpretation of predominantly occuring 90° reorientations and are consistent with the extended theory.read more
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Giant electric-field-induced strains in lead-free ceramics for actuator applications – status and perspective
Wook Jo,Robert Dittmer,Matias Acosta,Jiadong Zang,Claudia Groh,Eva Sapper,Ke Wang,Jürgen Rödel +7 more
TL;DR: In this paper, the status and perspectives of this new class of actuator ceramics are presented, aiming at covering a wide spectrum of topics, i.e., from fundamentals to practice, and a recent discovery has greatly extended our tool box for material design by furnishing (Bi 1/2Na1/2)TiO3-based (PZT) with a reversible phase transition between an ergodic relaxor state and a ferroelectric with the application of electric field.
Journal ArticleDOI
Thermodynamical formulation for coupled electromechanical hysteresis effects—I. Basic equations
TL;DR: In this paper, a thermodynamic phenomenological formulation of a theory capable of displaying electromechanical hysteresis effects in continous media, which should apply to ferroelectric ceramics, is presented.
Journal ArticleDOI
Characterization of the effective electrostriction coefficients in ferroelectric thin films
TL;DR: In this article, the electrostriction coefficients of a number of ferroelectric films including PbZrxTi1-xO3(PZT), 0.9PbMg(1/3)Nb(2/3)-O(3)-0.1PbTiO(4), and SrBi2Ta2O9(SBT) are investigated using laser interferometry combined with conventional dielectric measurements.
Journal ArticleDOI
90° domain wall relaxation and frequency dependence of the coercive field in the ferroelectric switching process
TL;DR: In this paper, the authors investigated the mechanisms involved in the polarization switching process in soft and hard Pb(Zr53,Ti47)O3 bulk ceramics through the dependency of the hysteresis loop on the frequency.
Journal ArticleDOI
Thermodynamical formulation for coupled electromechanical hysteresis effects. III: Parameter identification
E. Bassiouny,Gérard A. Maugin +1 more
TL;DR: In this article, the main arguments which are necessary to construct the electric hysteresis loop are discussed, and the effects of different types of couplings with the stress (e.g. piezoelectric and electrostrictive) on the overall shape of the electric hydresis curve and the coercive field are discussed.
References
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Journal ArticleDOI
Hot‐Pressed (Pb,La)(Zr,Ti)O3 Ferroelectric Ceramics for Electrooptic Applications
G. H. Haertling,Cecil E. Land +1 more
TL;DR: In this paper, transparent ferroelectric ceramic materials suitable for a variety of electrooptic applications were found in the quaternary (Pb,La,Zr,Ti)O3 system.
Journal ArticleDOI
XCVI. Theory of barium titanate
TL;DR: In this article, the theory of the dielectric and crystallographic properties of barium titanate is considered, and the free energy as a function of polarization and strain and making reasonable assumptions about the coefficients is found possible to account for the various crystal transitions.
Journal ArticleDOI
Double Hysteresis Loop of BaTi O 3 at the Curie Point
TL;DR: In this paper, it is shown that the shape of the hysteresis loop at temperatures slightly above the Curie point corresponds to the paraelectric state of BaTi.
Journal ArticleDOI
Atomic Displacement Relationship to Curie Temperature and Spontaneous Polarization in Displacive Ferroelectrics
TL;DR: In this paper, a least square fit was performed on displacive ferroelectrics in which atomic positions have been determined and it was shown that a fundamental relationship exists between the Curie temperature and the displacement of certain atoms from their higher-temperature symmetry positions.
Journal ArticleDOI
Domain Processes in Lead Titanate Zirconate and Barium Titanate Ceramics
TL;DR: In this paper, the authors measured the amount of 90° reorientation during poling from mechanical strains measured during the poling process and showed that very high compressive stress parallel to the polar axis causes 90° switching of nearly all aligned domains, and, therefore, removes virtually all polarization.
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