Publication

Dielectric response and structural features of Pb(Sc1/2Ta1/2)O-3 (PST) sol-gel derived thin films

Nava Setter, Paul Muralt, Alexander Tagantsev, Marco Cantoni
2004
Journal Articles

Abstract

Relaxor Pb(Sc-12/Ta-1/2)O-3 (PST) thin films have been prepared using mixed alkoxide and acetate precursors on TiO2/Pt/TiO2/SiO2/Si substrates. Relaxor behavior as evidenced by frequency dispersion of the permittivity as a function of temperature was observed, as well as a thickness dependence of the dielectric constant. The highest values of dielectric constant were observed for the thicker 650 nm samples displaying a room temperature dielectric constant near 2000, with a loss tangent of 0.3% at 1 kHz. The AC and DC field dependence of dielectric properties showed different signs of non-linearity, which is qualitatively explained in terms of polar region boundary movement. In addition, the measurement and analysis of pyroelectric properties under DC bias suggests the presence of polar regions in the ostensibly cubic paraelectric phase at 25degreesC.

Official source

https://infoscience.epfl.ch/entities/publication/c93bf517-2d2f-4e8e-9cb6-f08b75174222

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Nava Setter, Paul Muralt, Alexander Tagantsev, Marco Cantoni
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c93bf517-2d2f-4e8e-9cb6-f08b75174222

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.

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.

Pyroelectricity

Pyroelectricity (from the two Greek words pyr meaning fire, and electricity) is a property of certain crystals which are naturally electrically polarized and as a result contain large electric fields. Pyroelectricity can be described as the ability of certain materials to generate a temporary voltage when they are heated or cooled. The change in temperature modifies the positions of the atoms slightly within the crystal structure, so that the polarization of the material changes.

Related publications (3)

Dielectric response and structural features of Pb(Sc1/2Ta1/2)O-3 (PST) sol-gel derived thin films

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