Piezoelectric ceramic compositions comprising a principal component, ##EQU1## and manganese contained therein as an additive in the amount of 0.1 to 2.0 wt % of MnO.sub.2 with respect to the weight of 1 mol of the principal component. The piezoelectric ceramic compositions are suitable for use for pyroelectric...http://www.google.es/patents/US4605876?utm_source=gb-gplus-sharePatente US4605876 - Piezoelectric ceramic energy trapping electronic device
Piezoelectric ceramic energy trapping electronic device
