Multi-layered dielectric element

Details Multi-layered dielectric element Multi-layered dielectric element

1989-04-12

1989-12-12

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

252521, 264 61, H01G 410, H01B 312, H01B 106

Patent

active

048871869

ABSTRACT:
A multi-layered dielectric element serving as a capacitor or actuator which comprises a dielectric unit including a plurality of dielectric layers made of a perovskite oxide and a plurality of internal electrode layers sandwiched between the respective dielectric layers. The internal electrodes are each made of at least one conductive composite oxide of La, Ba and Cu having a perovskite-like structure wherein the atomic ratios of the metals are such that (La+Ba)/Cu=1 and La/Ba=4, or at least one conductive composite oxide of La, Sr and Cu having a perovskite-like structure wherein the atomic ratios of the metals are such that (La+Sr)/Cu=1 and La/Sr=3 or 4. The unit is sintered at a temperature of from 900.degree. to 1100.degree. C., so that interdiffusion of metal ions between the dielectric layers and the internal electrode layers is suppressed to a significant extent.

REFERENCES:
patent: 3996168 (1976-12-01), Hoffmann et al.
patent: 4075681 (1978-02-01), Popowich
patent: 4296002 (1981-10-01), Sokoly et al.
patent: 4305848 (1981-12-01), Hikita et al.
patent: 4362637 (1982-12-01), Matsuo et al.
patent: 4799127 (1989-01-01), Ono et al.
"Electrodes for Piezoelectric Actuators" by Kenji Uchino; Ceramics, vol. 21, No. 3, Mar. 1986; published by The Ceramic Society of Japan.

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