Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1992-09-10
1994-08-09
Bell, Mark L.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
501136, 501137, H01G 412, C04B 3546
Patent
active
053372093
ABSTRACT:
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.
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Bailey Alex E.
Bridger Keith
Christodoulou Julie A.
Fiore Eric M.
Gelb Allan S.
Bell Mark L.
Jones Deborah
Martin Marietta Corporation
Rees Brian J.
Winchell Bruce M.
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