Martin Marietta Corporation

Audrey E Sutherland

Alex E Bailey

Andrew Paul Ritter

Stephen R Winzer

Keith Bridger

Allan S Gelb

Inam Jawed

Eric M Fiore

Julie A Christodoulou

This invention relates to new ceramic piezoelectric compositions having superior electrical properties, processes for the preparation of the new piezoelectric composition and applications for the new compositions. Specifically, a solid solution composition of 85.5-87.5 molar percent lead zinc niobate, 9.5-9.7 molar percent lead titanate and 3-5 molar percent of a barium titanate dopant or strontium titanate dopant has exhibited desirable electrical properties. This specific composition is well suited for use in a 3-1 connectivity composite, which can be used as a hydrophone. These compositions may be prepared by oxide sintering techniques utilizing extremely high purity materials, or alternatively, by a sol gel process.

Piezoelectric ceramic material including processes for preparation

A dielectric ceramic composition is disclosed comprising lead magnesium niobate and strontium titanate, barium titanate or a combination thereof. Dopants such as Ta, La, Y, Eu, Nd, Sm, Gd, W, Si, Zr and Sb may also be included in the composition. The lead magnesium niobate with strontium titanate and/or barium titanate composition has been found to possess extremely favorable properties such as high dielectric constant, low dielectric loss, high breakdown strength, low field-induced strain, high electrical resistivity and exceptionally high energy storage capacity. A process is also disclosed for the production of dielectric ceramic materials which includes the use of hot isostatic pressing in an oxygen-containing atmosphere. The disclosed dielectric compositions are useful in capacitors for many applications, including medical devices such as defibrillators and pacemakers.

High energy density lead magnesium niobate-based dielectric ceramic and

The invention relates to new ceramic electrostrictive compositions having superior electrical properties, a process for the preparation of the new electrostrictive compositions and applications for the new compositions. Specifically, a solid solution composition of lead magnesium niobate-lead titanate - (barium titanate or stronium titanate) has exhibited desirable electrostrictive properties. This composition shows a diminished dependence of dielectric constant on temperature.

Electrostrictive ceramic material including a process for the

This invention relates to new ceramic electrostrictive compositions having superior electrical properties, a process for the preparation of the new electrostrictive compositions and applications for the new compositions. Specifically, a solid solution composition of lead magnesium niobate-lead titanate--(barium titanate or stronium titanate) has exhibited desirable electrostrictive properties. This composition shows a diminished dependence of dielectric constant on temperature.

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Eldersburg, MD, United States of America

Audrey E Sutherland