Publication

Comparison of DC and AC field effects on dielectric properties of lead magnesium niobate relaxor: Study of single crystals and ceramics

Alexander Tagantsev
1997
Journal Articles

Abstract

Dielectric permittivity of PbMg1/3Nb2/3O3 (PMN) relaxor was investigated as a function of DC bias and AC driving field. In single crystals, DC and AC field effects exhibited very different behavior, including anisotropy and sign of the effect. It was shown that the model of PMN, in which the dielectric response of the material to the AC field was controlled by a side-way motion of the interphase boundaries of the polar regions, provided a good qualitative interpretation of the observed phenomena. Comparison of the DC and AC field effects measured in ceramics and single crystals demonstrated that the data obtained for ceramics correspond to the averaging of the non-linear effects over random orientations of the grains.

Official source

https://infoscience.epfl.ch/entities/publication/e9b8ec50-0431-4e63-b301-a72264959684

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Alexander Tagantsev
1997
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e9b8ec50-0431-4e63-b301-a72264959684

About this result

Related concepts (32)

Dielectric

In electromagnetism, a dielectric (or dielectric medium) is an electrical insulator that can be polarised by an applied electric field. When a dielectric material is placed in an electric field, electric charges do not flow through the material as they do in an electrical conductor, because they have no loosely bound, or free, electrons that may drift through the material, but instead they shift, only slightly, from their average equilibrium positions, causing dielectric polarisation.

Permittivity

In electromagnetism, the absolute permittivity, often simply called permittivity and denoted by the Greek letter ε (epsilon), is a measure of the electric polarizability of a dielectric. A material with high permittivity polarizes more in response to an applied electric field than a material with low permittivity, thereby storing more energy in the material. In electrostatics, the permittivity plays an important role in determining the capacitance of a capacitor.

Relative permittivity

The relative permittivity (in older texts, dielectric constant) is the permittivity of a material expressed as a ratio with the electric permittivity of a vacuum. A dielectric is an insulating material, and the dielectric constant of an insulator measures the ability of the insulator to store electric energy in an electrical field. Permittivity is a material's property that affects the Coulomb force between two point charges in the material. Relative permittivity is the factor by which the electric field between the charges is decreased relative to vacuum.

Related publications (2)

Comparison of DC and AC field effects on dielectric properties of lead magnesium niobate relaxor: Study of single crystals and ceramics

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