Journal ArticleDOI
Dielectric properties of tetragonal lanthanum modified lead zirconate titanate ceramics
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Tetragonal La-modified lead zirconate titanate ceramics with a Zr/Ti ratio of 40/60 (x/40/60) with La contents (x) between 0 and 21 at.Abstract:
Tetragonal La‐modified lead zirconate titanate ceramics with a Zr/Ti ratio of 40/60 (x/40/60) with La contents (x) between 0 and 21 at. % were prepared by the mixed oxide method and were subsequently characterized using dielectric spectroscopy. Small La contents tended to diffuse the dielectric response in the temperature region around the phase transition, however, no distinct changes were observed in the paraelectric region. Compositions with intermediate La contents showed a thermally driven (spontaneous) transformation from a relaxor to a normal ferroelectric, i.e., micro‐macro domain switching. Materials with a high La content exhibited typical relaxor ferroelectric behavior. The relative thermodynamic stability of the ensemble of micropolar regions is then discussed in reference to that of the long‐range ferroelectric state.read more
Citations
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The relaxational properties of compositionally disordered ABO3 perovskites
TL;DR: In this article, a review of the relaxational properties of random-site electric dipoles in dielectrics is presented, including the role of pressure and applied dc biasing electric fields in understanding the physics of these materials including the R-to-FE crossover.
Journal ArticleDOI
Local Structural Heterogeneity and Electromechanical Responses of Ferroelectrics: Learning from Relaxor Ferroelectrics
Journal ArticleDOI
Structure and electrical properties of (Na0.5Bi0.5)1−xBaxTiO3 piezoelectric ceramics
TL;DR: In this article, the results of X-ray diffraction analysis revealed a MPB composition range of x ǫ = 0.06-0.10 for (Na 0.5 Bi 0.10 ) 1− x Ba x TiO 3 system at room temperature, where the relative content of the tetragonal phase is substantially higher than that of the rhombohedral phases.
Journal ArticleDOI
Spontaneous (zero‐field) relaxor–to–ferroelectric‐phase transition in disordered Pb(Sc1/2Nb1/2)O3
TL;DR: In this paper, it was shown that disordered Pb(Sc 1/2Nb1/2)O3 ceramics have a similar nature: when produced in a manner that does not eliminate lead vacancies, they exhibit normal relaxor behavior.
Journal ArticleDOI
Enhanced antiferroelectric phase stability in La-doped AgNbO3: perspectives from the microstructure to energy storage properties
Jing Gao,Yichi Zhang,Lei Zhao,Kai-Yang Lee,Qing Liu,Andrew J Studer,Manuel Hinterstein,Shujun Zhang,Jing-Feng Li +8 more
TL;DR: In this paper, the phase stability and energy storage properties of La-doped AgNbO3 lead-free ceramics were investigated, and the temperature and electric field-dependent dielectric constants showed that the antiferroelectric phase stability is enhanced via the La doping.
References
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Journal ArticleDOI
Crystal stability and the theory of ferroelectricity
TL;DR: In this article, it is shown that the parameters which determine the lattice vibrations of a diatomic ionic crystal may be chosen in such a way that the crystal will exhibit ferroelectric properties, and that anti-ferroelectric transitions may be regarded as the result of an instability of the crystal for a certain normal mode of vibration.
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
The Role of B-Site Cation Disorder in Diffuse Phase-Transition Behavior of Perovskite Ferroelectrics
Nava Setter,L. E. Cross +1 more
TL;DR: In this paper, it was shown that the degree of order in the B site Sc3+, Ta5+ cations can be controlled by suitable thermal annealing.
Journal ArticleDOI
Crystalline ferroelectrics with glassy polarization behavior
Gerald Burns,F. H. Dacol +1 more
TL;DR: In this paper, the optic index of refraction as a function of temperature was measured in the crystalline ferroelectrics having the simple perovskite structure and it was shown that these crystals possess a local, randomly oriented, nonreversible polarization below a temperature several hundred degrees above the ferroelectric phase-transition temperature.
Journal ArticleDOI
Deviation from Curie-Weiss behavior in relaxor ferroelectrics.
TL;DR: It is proposed that this deviation arises due to short-range correlations between polar regions, and that these correlations at high temperatures are the precursor to a freezing of the polarization fluctuations into a glassy state.
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