Ceramic multilayer chip capacitor and method for making

Details Ceramic multilayer chip capacitor and method for making Ceramic multilayer chip capacitor and method for making

1990-10-18

1992-03-17

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

29 2542, 264 61, H01G 412, C04B 3546

Patent

active

050973916

ABSTRACT:
In a ceramic multilayer chip capacitor comprising alternately stacked internal electrodes of Ni or Ni alloy and dielectric layers, an oxide layer having a different composition from the dielectric layer is formed on the periphery of each internal electrode. The dielectric layer consists essentially of grains and a grain boundary phase, the percent area of the grain boundary phase being up to 2% of the area of a cross section of the dielectric layer. The capacitor is prepared by alternately stacking Ni or Ni alloy and a dielectric material in layer form, firing and then heat treating the stack under predetermined oxygen partial pressures. The dielectric material is a barium titanate base oxide material. The capacitor has a long effective life.

REFERENCES:
patent: 4097911 (1978-06-01), Dorrian
patent: 4115493 (1978-09-01), Sakabe et al.
patent: 4241378 (1980-12-01), Dorrian
patent: 4604676 (1986-08-01), Senda et al.
patent: 4612600 (1986-09-01), Hodgkins
patent: 4988650 (1991-01-01), Takagi et al.

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