High frequency wave absorbing ceramics

Details High frequency wave absorbing ceramics High frequency wave absorbing ceramics

1987-11-25

1989-06-20

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

C04B 3500

Patent

active

048409260

ABSTRACT:
A high frequency wave absorbing ceramics can be used, for example, as an EMI preventive filter for interrupting high frequency waves intruding into electronic circuits. The high frequency wave absorbing ceramics are composed of a ternary composition comprising from 55 to 85 mol % of lead iron niobate Pb(Fe.sub.1/2 Nb.sub.1/2)O.sub.3, from 10 to 40 mol % of lead iron tungstate Pb(Fe.sub.2/3 W.sub.1/3)O.sub.3 and not more than 20 mol % of lead nickel tantalate Pb(Ni.sub.1/3 Ta.sub.2/3)O.sub.3 based on the total 100 mol % of a composition composed of lead iron niobate Pb(Fe.sub.1/2 Nb.sub.1/2)O.sub.3, lead iron tungstate Pb(Fe.sub.2/3 W.sub.1/3)O.sub.3 and lead nickel tantalate Pb(Ni.sub.1/3 Ta.sub.2/3)O.sub.3.

REFERENCES:
patent: 4379319 (1983-04-01), Wilson
patent: 4555494 (1985-11-01), Nishida et al.
Ceramic Bulletin vol. 63, No. 6, pp. 808-810, 820, `Dielectric Properties in the Pb(Fe.sub.1/2 Nb.sub.1/2)O.sub.3 --Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3 Solid-Solution System` by Thomas R. Shrout et al.

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