High frequency wave absorbing ceramics

摘要

A high frequency wave absorbing ceramics can be used, for example, as an EMI preventive filter for interrupting high frequency wave intruding into electronic circuits. The high frequency wave absorbing ceramics are composed of a ternary composition comprising from 50 to 82.5 mol % of lead iron niobate Pb(Fe1/2Nb1/2)O3, from 17.5 to 40 mol % of lead iron tungstate Pb(Fe2/3W1/3)O3 and not more than 25 mole % of lead cobalt niobate Pb(Co1/3Nb2/3)O3 based on the total 100 mol % of a composition composed of lead iron niobate Pb(Fe1/2Nb1/2)O3, lead iron tungstate Pb(Fe2/3W1/3)O3 and lead cobalt niobate Pb(Co1/3Nb2/3)O3.