Publication

Modified Lead Calcium Titanate Ceramics with a Relatively Large Dielectric-Constant for Hydrophone Applications

Dragan Damjanovic
1994
Journal Articles

Abstract

Modified lead titanate of the base composition (Pb,Ca)Ti-(Co,W)O3 + 0.01 mol % MnO was doped with 2 to 6 mol % strontium and barium to increase the dielectric constant, K, while preserving a high piezoelectric anisotropy (d33/d31). K was increased above 500 and a d33/d31 ratio of 34/1 was achieved when the composition Pb0.65Ca0.31Sr0.04Ti0.94-(Co0.5W0.5)0.06O3 + 0.01 mol% MnO was fabricated. The large d33/d31 resulted in an impressive hydrostatic piezoelectric coefficient (d(h) = 81 X 10(-12) m2/V). The relatively low transition temperature (T(c) = 120-degrees-C) did not result in an increased aging rate when samples were tested at 40-degrees-C and 99% humidity for 120 h after poling. A small tetragonality ratio (1.008) enabled saturation of ceramic properties at poling fields as low as 30 kV/cm at 100-degrees-C.

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https://infoscience.epfl.ch/entities/publication/b9c5ed70-defb-4bbf-a5ce-32a2a08c8926

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Dragan Damjanovic
1994
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b9c5ed70-defb-4bbf-a5ce-32a2a08c8926

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.

High-κ dielectric

In the semiconductor industry, the term high-κ dielectric refers to a material with a high dielectric constant (κ, kappa), as compared to silicon dioxide. High-κ dielectrics are used in semiconductor manufacturing processes where they are usually used to replace a silicon dioxide gate dielectric or another dielectric layer of a device. The implementation of high-κ gate dielectrics is one of several strategies developed to allow further miniaturization of microelectronic components, colloquially referred to as extending Moore's Law.

Related publications (10)

Modified Lead Calcium Titanate Ceramics with a Relatively Large Dielectric-Constant for Hydrophone Applications

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