Temperature stable monolithic capacitors and ceramic compositions for producing same

Patent · Tue Feb 19 04:00:00 EST 1985

OSTI ID:5617616

Wilson, J M

Multilayer ceramic capacitors, and in particular NPO class capacitors are produced from dielectric compositions comprising a mixture of BaO, PbO, Nd/sub 2/O/sub 3/, Bi/sub 2/O/sub 3/, TiO/sub 2/ and one of the rare earth oxides selected from the group consisting of Pr/sub 6/O/sub 11/ and Sm/sub 2/O/sub 3/, the selected rare earth oxide being present in an amount ranging from approximately 10 to 100 wt. % of the amount of Nd/sub 2/O/sub 3/ in the mixture. In one embodiment an acrylic binder is added to the mixture to produce ceramic sheets which are screen printed with a Pt-Pd-Au electrode, and then cut into thin layers, stacked, laminated, sintered and terminated to produce a multilayer capacitor having an extremely stable TC and effective dielectric constant as high as 120. A high bismuth glass frit composition may be mixed with the dielectric ceramic mixture to produce a low sintering temperature mixture which is processed as above and then screen printed with a Ag-Pd alloy and laminated to produce a multilayer capacitor which can be sintered at a temperature as low as 1100/sup 0/ C.

• Assignee: Ferro Corp.
• Patent Number(s): US 4500942
• OSTI ID: 5617616
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
42 ENGINEERING
420800* -- Engineering-- Electronic Circuits & Devices-- (-1989)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BINDERS
CAPACITORS
CERAMICS
CHALCOGENIDES
DIELECTRIC PROPERTIES
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTRODES
ELEMENTS
EQUIPMENT
FABRICATION
LEAD COMPOUNDS
LEAD OXIDES
METALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
RARE EARTH COMPOUNDS
SILVER
SINTERING
TRANSITION ELEMENTS