Publication

High frequency dielectric relaxation in Pb(Sc1/2Ta1/2)O-3 ceramics

Nava Setter
1996
Journal Articles

Abstract

Pb(Sc1/2Ta1/2)O-3 ceramics have been characterized by dielectric measurements in a wide range of frequencies (10(2)-10(9) Hz). A strong dispersion occurs with two low and high frequency contributions below the transition temperature. Only high frequency relaxation is still observed at high temperature. A microscopic model of correlated chains was used in order to explain the latter relaxation. Dipole correlations at low temperature are responsible for the low frequency dispersion. A minimum in the high frequency relaxation appears at the transition temperature. Identical results have been observed for a Pb(Sc1/2Nb1/2)O-3 ceramic.

Official source

https://infoscience.epfl.ch/entities/publication/68fb459f-a793-4e5e-ae3c-95da90ccec2b

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Nava Setter
1996
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/68fb459f-a793-4e5e-ae3c-95da90ccec2b

About this result

Related concepts (32)

Dielectric spectroscopy

Dielectric spectroscopy (which falls in a subcategory of impedance spectroscopy) measures the dielectric properties of a medium as a function of frequency. It is based on the interaction of an external field with the electric dipole moment of the sample, often expressed by permittivity. It is also an experimental method of characterizing electrochemical systems. This technique measures the impedance of a system over a range of frequencies, and therefore the frequency response of the system, including the energy storage and dissipation properties, is revealed.

Spin–spin relaxation

In physics, the spin–spin relaxation is the mechanism by which Mxy, the transverse component of the magnetization vector, exponentially decays towards its equilibrium value in nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). It is characterized by the spin–spin relaxation time, known as T2, a time constant characterizing the signal decay. It is named in contrast to T1, the spin–lattice relaxation time.

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.

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High frequency dielectric relaxation in Pb(Sc1/2Ta1/2)O-3 ceramics

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