Results 161 to 170 of about 1,179 (218)
Some of the next articles are maybe not open access.
Applied Physics Letters, 2007
The site and charge disordered solid solution 0.8Pb(Fe1∕2Nb1∕2)O3–0.2Pb(Mg1∕2W1∕2)O3 is a magnetoelectric relaxor which shows broad and frequency dependent maxima both in the electric as well as in the magnetic susceptibilities. The Vogel-Fulcher-type electric relaxor freeze-out is accompanied by a significant magnetic anomaly demonstrating ...
A. Levstik +7 more
openaire +1 more source
The site and charge disordered solid solution 0.8Pb(Fe1∕2Nb1∕2)O3–0.2Pb(Mg1∕2W1∕2)O3 is a magnetoelectric relaxor which shows broad and frequency dependent maxima both in the electric as well as in the magnetic susceptibilities. The Vogel-Fulcher-type electric relaxor freeze-out is accompanied by a significant magnetic anomaly demonstrating ...
A. Levstik +7 more
openaire +1 more source
Applied Physics Letters, 2011
Epitaxial biferroic relaxors of formula Pb[(Zr0.53Ti0.47)0.4(Fe0.67W0.33)0.6]O3 (PZTFW) were grown by pulsed laser deposition (PLD) techniques. Raman spectra revealed a global Fm3m symmetry with two high-frequency A1g modes that imply the existence of polar nano-regions (PNRs). Near room temperature, frequency-dependent dielectric patterns follow Vogel-
Ashok Kumar, J. F. Scott, R. S. Katiyar
openaire +1 more source
Epitaxial biferroic relaxors of formula Pb[(Zr0.53Ti0.47)0.4(Fe0.67W0.33)0.6]O3 (PZTFW) were grown by pulsed laser deposition (PLD) techniques. Raman spectra revealed a global Fm3m symmetry with two high-frequency A1g modes that imply the existence of polar nano-regions (PNRs). Near room temperature, frequency-dependent dielectric patterns follow Vogel-
Ashok Kumar, J. F. Scott, R. S. Katiyar
openaire +1 more source
Dielectric relaxor and ferroelectric relaxor: Bi-doped paraelectric SrTiO3
Journal of Applied Physics, 2002In this article, we report the evolution of the dielectric behavior from a dielectric relaxor to a ferroelectric relaxor with variation of Bi concentration in (Sr1−1.5xBix)TiO3 (0⩽x⩽0.2). In the doping range 0.0005⩽x⩽0.002, two dielectric modes A and B are induced.
Chen Ang, Zhi Yu
openaire +1 more source
Lead‐Free Relaxor Ferroelectrics
Journal of the American Ceramic Society, 2011Feature size is a natural determinant of material properties. Its design offers the technological perspectives for material improvement. Grain size, crystallite size, domain width, and structural defects of different nature constitute the classical design elements.
Shvartsman, Vladimir, Lupascu, Doru C.
openaire +1 more source
Optical Properties of Relaxor Ferroelectrics
Ferroelectrics, 2004The optical absorption spectrum, luminescent emission and photoconductivity were investigated in single crystal PbMg1/3Nb2/3O3 and in the Pb0.91La0.09(Zr0.65Ti0.35)O3 ceramics in the wide temperature region. The spectrum of the luminescence correlates with spectrum of photoconductivity emission.
Zverev D. +4 more
openaire +3 more sources
AIP Conference Proceedings, 2001
A dynamic spherical random bond-random field (SRBRF) model based on the coupled polar cluster picture is formulated. Assuming stochastic flips of the cluster polarization, the Langevin equations of motion are written down, from which the linear and nonlinear dynamic dielectric permittivities are derived. A coupled SRBRF pseudospin phonon Hamiltonian is
openaire +1 more source
A dynamic spherical random bond-random field (SRBRF) model based on the coupled polar cluster picture is formulated. Assuming stochastic flips of the cluster polarization, the Langevin equations of motion are written down, from which the linear and nonlinear dynamic dielectric permittivities are derived. A coupled SRBRF pseudospin phonon Hamiltonian is
openaire +1 more source
Physical Review Letters, 2019
In ferroelectric and relaxor-ferroelectric materials, piezoelectric and dielectric properties are significantly enhanced at the morphotropic phase boundary (MPB), a boundary between different ferroelectric phases with different macroscopic symmetries. By contrast, in relaxor systems, such an MPB does not exist because relaxors of different compositions
Yang, Yang +5 more
openaire +2 more sources
In ferroelectric and relaxor-ferroelectric materials, piezoelectric and dielectric properties are significantly enhanced at the morphotropic phase boundary (MPB), a boundary between different ferroelectric phases with different macroscopic symmetries. By contrast, in relaxor systems, such an MPB does not exist because relaxors of different compositions
Yang, Yang +5 more
openaire +2 more sources
A brief review on relaxor ferroelectrics and selected issues in lead-free relaxors
Journal of the Korean Physical Society, 2016Relaxor ferroelectricity is one of the most widely investigated but the least understood material classes in the condensed matter physics. This is largely due to the lack of experimental tools that decisively confirm the existing theoretical models. In spite of the diversity in the models, they share the core idea that the observed features in relaxors
Ahn, Chang Won +10 more
openaire +2 more sources
Polaron-Related Polar Clusters in Ferroelectric Relaxors And Novel Relaxor Systems
Radiation Effects and Defects in Solids, 2003A new mechanism of freezing phenomena and dielectric losses with Vogel-Fulcher law behaviour in ferroelectric relaxors of PMN-type is proposed. New possible relaxor systems including the ferroelectric-antiferromagnetic relaxor case are discussed in this connection.
V. S. Vikhnin, S. E. Kapphan
openaire +1 more source
Photostimulated phenomena in relaxors
Journal of Experimental and Theoretical Physics Letters, 2003The action of illumination on the conducting and dielectric properties of lead magnoniobate was investigated. The photostimulated currents were examined and the spectral dependence of photoconductivity in the region of diffuse phase transition was obtained.
Mamin R. +5 more
openaire +3 more sources