High frequency wave absorbing ceramics

Details High frequency wave absorbing ceramics High frequency wave absorbing ceramics

1986-03-07

1988-05-03

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

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

C04B 3526, C01G 4906

Patent

active

047420316

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 has a composition expressed by the chemical formula Pb{Fe.sub.1/2 Nb.sub.(1/2-x) Ta.sub.x }O.sub.3 where 0.1<x<0.35. The high frequency wave absorbing ceramics may be composed of a composition comprising from 30 to 80 mol % of lead iron niobate Pb(Fe.sub.1/2 Ta.sub.1/2)O.sub.3 based on the total 100 mol % of a Pb(Fe.sub.1/2 Nb.sub.1/2)O.sub.3 and from 20 to 70 mol % of lead iron tantalate composition composed of lead iron niobate Pb(Fe.sub.1/2 Nb.sub.1/2)O.sub.3 and lead iron tantalate Pb(Fe.sub.1/2 Ta.sub.1/2)O.sub.3.

REFERENCES:
patent: 813462 (1985-12-01), Ohya et al.
patent: 813780 (1985-12-01), Saburi et al.
patent: 4379319 (1985-04-01), Wilson
patent: 4555494 (1985-11-01), Nishida et al.
Ceramic Bulletin, vol. 63, No. 6 (1984), pp. 808-810 and 820.

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