Journal ArticleDOI
Spontaneous Trasition between Relaxor and Ferroelectric States in Lanthanum-Modified Lead Zirconate Titanate (6–7)/65/35
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TLDR
A relaxor-ferroelectric phase transition takes place in PLZT (6-7)/65/35 at temperature lower than the temperature of the dispersive dielectric constant maximum.Abstract:
Dielectric and light scattering measurements are performed in lanthanum modified lead zirconate titanate (PLZT) (6–8)/65/35 hot-pressed ceramics in order to refine the phase diagram. A relaxor-ferroelectric phase transition takes place in PLZT (6–7)/65/35 at temperature lower than the temperature of the dispersive dielectric constant maximum. At this temperature the size of polar regions "a" essentially increases up to a>λ (=0.63 µ m). The appearence of ferroelectric long-range order in PLZT with decreased concentration of La ions is explained by larger coupling between ferroelectrically active BO6 octahedrons due to the smaller concentration of defects and higher dielectric constant.read more
Citations
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Journal ArticleDOI
Recent progress in relaxor ferroelectrics with perovskite structure
Alexei A. Bokov,Zuo-Guang Ye +1 more
TL;DR: In this article, the lattice dynamics and the peculiar dielectric relaxation in relaxors are discussed, and theoretical models for the mechanisms of PNR formation and freezing into nonergodic glassy state are also presented.
Journal ArticleDOI
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
Electron emission from ferroelectrics
TL;DR: The electron emission from ferroelectrics (FEE) is an unconventional electron emission effect as discussed by the authors, which is a tunneling emission current which screens uncompensated polarization charges, generated by a deviation of macroscopic spontaneous polarization from its equilibrium state under pyroelectric effect, piezoelectric effect, or polarization switching.
Journal ArticleDOI
Dielectric dispersion of the relaxor PLZT ceramics in the frequency range 20 Hz-100 THz
Stanislav Kamba,Viktor Bovtun,Jan Petzelt,I. Rychetsky,R. Mizaras,A. Brilingas,Juras Banys,Jonas Grigas,M. Kosec +8 more
TL;DR: In this paper, the dielectric dispersion of the transparent relaxor ferroelectric ceramics PLZT 8/65/35 and 9.5/35 was determined in a wide frequency range including the microwave and infrared range.
Book ChapterDOI
Ferroelectricity revisited—Advances in materials and physics
TL;DR: In this paper, a review of the phenomenological, soft mode, and first-principles theories of ferroelectrics is presented, which deals with selected salient properties and associated physics.
References
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Journal ArticleDOI
Glassy polarization behavior of relaxor ferroelectrics
TL;DR: The polarization behavior of La-modified lead zirconate titanate relaxors has been investigated for various electrical and thermal histories and the magnitude of both polarizations were found to be equal above a critical temperature.
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