High-Throughput Preparation and Properties Investigation of BNT Based Lead-Free Piezoelectric Ceramics

摘要

A high-throughput (HT) bulk ceramic preparation process was applied to synthesize multi-compositional lead-free piezoelectric ceramics. The lead-free piezoelectric ceramic sample library with a chemical composition of 87Bio5Nao5Ti03-6BaTi03-7Ko5Nao5Nb03 (87BNT-6BT-7KNN) were prepared to confirm the validity of the HT preparation process. The XRD pattern and surface SEM images showed great consistency of the phase and morphology of the 16 samples in the library. The mean value of dielectric constant and piezoelectric coefficient were = 1848 and d33 = 14pC/N. Ferroelectric and strain properties also demonstrated a high consistency of Ps, Pn Ec and d33 with the mean values of 25.9 uC/cm2, 3.6 uC/cm2, 0.64 kV/mm and 290 pm/V, respectively. The corresponding Coefficient of Variance (CV) values of all these parameters are quite low, which indicate that the HT method reported in this work is feasible in the discovering of new lead-free piezoelectric materials.