piesoelektriliste omadustega tehnokeraamika; polükristallilisest keraamikast on tuntud nt Pb(Zr,Ti)O3, Pb(Mg1/3Nb2/3)O3 jt (vt tehnokeraamika), advanced ceramics with piezoelectric properties useful in the electrical generating devices; among the polycristalline ceramics thet display piezoelectricity, the most important are PZT /lead zirconate, Pb(Zr,Ti)O2) and PMN (lead magnesium niobate, Pb(Mg1/3,Nb2/3)O3 etc (see: engineering ceramics)