Enhanced piezoelectric properties of Nb and Mn co-doped CaBi4Ti4O15 high temperature piezoceramics

摘要

The properties of CaBi4Ti4O15 (CBT), CaBi4Ti3.95Nb0.05O15 (CBTN) and CaBi4Ti3.95Nb0.05O15 + 0.2 wt% MnO2 (CBTN-Mn) ferroelectric ceramics with bismuth layer structure were studied. Significant enhancement of piezoelectric coefficient was obtained for CBTN-Mn ceramics (d(33) = 23 pC/N), being nearly three times that of CBT counterpart (d(33) = 8 pC/N). Together with its high Curie temperature (T-c = 790 degrees C), low dielectric loss (tan delta = 0.2%), high resistivity (rho = 4.2 x 10(6) Omega cm at 500 degrees C) and good thermal stability up to 700 degrees C, the CBTN-Mn ceramic is a potential material for high temperature piezoelectric applications.

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