Temperature stable monolithic capacitors and ceramic compositions for producing same
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
- Application Number:
- TRN: 85-016469
- OSTI ID:
- 5617616
- Resource Relation:
- Patent File Date: Filed date 12 Nov 1982; Other Information: PAT-APPL-440804
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CAPACITORS
FABRICATION
CERAMICS
BARIUM OXIDES
BINDERS
DIELECTRIC PROPERTIES
ELECTRODES
LEAD OXIDES
NEODYMIUM OXIDES
PALLADIUM
PLATINUM
SILVER
SINTERING
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
LEAD COMPOUNDS
METALS
NEODYMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM METALS
RARE EARTH COMPOUNDS
TRANSITION ELEMENTS
420800* - Engineering- Electronic Circuits & Devices- (-1989)
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication