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Dielectric non-linearity and the nature of polarization response of PbMg1/3Nb2/3O3 relaxor ferroelectric

Related publications (36)

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Strong ferroelectric domain-wall pinning in BiFeO3 ceramics

Nava Setter, Dragan Damjanovic, Marija Kosec

We have studied the polarization-electric-field hysteresis, the dielectric permittivity dispersion, the piezoelectric properties, the electric-field-induced strain, and the interrelations between these properties for bismuth ferrite (BiFeO3) ceramics. The ...

American Institute of Physics2010

Evidence for dielectric aging due to progressive 180 degrees domain wall pinning in polydomain Pb(Zr0.45Ti0.55)O-3 thin films

Nava Setter, Alexander Tagantsev, Dragan Damjanovic, Igor Stolichnov, Pavel Mokry

An evidence that the dielectric aging in the polydomain Pb(Zr0.45Ti0.55)O-3 thin films is controlled by progressive pinning of 180 degrees domain walls is presented. To provide such a conclusion, we use a general method, which is based on the study of the ...

2009

Hyper-Raman spectrum of vitreous silica from first principles

Alfredo Pasquarello

We introduce a scheme for the calculation of nonresonant hyper-Raman spectra of vitreous materials within a density-functional formulation. Hyper-Raman tensors are obtained through the application of finite electric fields and explicitly account for the no ...

2007

Theory of atomic-scale dielectric permittivity at insulator interfaces

Alfredo Pasquarello

We develop a theory for investigating atomic-scale dielectric permittivity profiles across interfaces between insulators. A local susceptibility chi(x;omega) is introduced to describe variations of the dielectric response over length scales of the order of ...

2005

Dielectric response of periodic systems from quantum Monte Carlo calculations

Nicola Marzari, Giulia Galli Gygi

We present a novel approach that allows us to calculate the dielectric response of periodic systems in the quantum Monte Carlo formalism. We employ a many-body generalization for the electric-enthalpy functional, where the coupling with the field is expres ...

2005

We study the infrared properties of the Si-SiO2 interface within a first-principles approach. In order to provide an atomic-scale description of the dielectric permittivity (both high-frequency and static) and of the infrared absorption at the interface, w ...

EPFL2005

Hysteretic and nonlinear dielectric behaviour in ferroelectric ceramics has been of interest since 1950s, when these materials found application in various electronic devices. Presently, these phenomena concern with important areas of science, technology a ...

EPFL2005

Nonlinear dielectric response of soft and hard PZT is experimentally studied at subswitching conditions. The correlations between defect disordering and parameters of nonlinear dielectric response and hysteresis are demonstrated and discussed. (c) 2005 Els ...

2005

Dielectric susceptibility of dipolar molecular liquids by ab initio molecular dynamics: application to liquid HCl

Alfredo Pasquarello

We study the dielectric susceptibility of liquid hydrogen chloride at a temperature of 313 K using ab initio molecular dynamics evolving, in a homogeneous electric field. For an evolution in absence of electric field, the calculated neutron structure facto ...

2004

Ferroelectric thin films are widely studied nowadays as potential replacements for semiconductors in modern tunable microwave devices such as tunable filters, phase-shifters, frequency mixers, power dividers, etc. Recent progress in the deposition of compl ...

EPFL2004