Kind of Piezoelectric Materials Rochelle salt Potassiumsodium tartrate is a double salt first prepared ... It is slightly soluble in alnate titanate (Pb[ZrxTi1−x]O3 0 x 1) Potassiumniobate (KNbO3) Lithium niobate ... Sorrite (BiFeO3) Kind of Piezoelectric Materials SodiumpotassiumniobateSodiumpotassiumniobate (KNN