Abstract
Lead-free Sr-and Mn-doped Ca1-xSrxBi4Ti4O15, Ca1-yMnyBi4Ti4O15 bismuth layer piezoelectric ceramics have been prepared. The microstructure and electrical properties of the products were studied by XRD, SEM and Broadband LRC digital bridge. The obtained ceramics have Bi-layer perovskite phase. The dopings do not change the crystal phase of CaBi4Ti4O15. However, the doping amounts affect the size of crystal grain and porosity of the final products. The appropriate amounts of dopings for obtaining the highest dielectric constant and the lowest dielectric loss are determined. The prepared ceramics show the largest piezoelectric constant of 5.2~5.3 pC/N with the optimal Sr-and Mn-dopings.
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