Effect of Co3+ on structure and electrical properties of Na0.5Bi2.5Nb2O9 ceramics

Na0.5Bi2.5Nb2-xCoxO9 (NBNC-x, x = 0.00, 0.02, 0.05, 0.07, 0.09) bismuth layered piezoelectric ceramics were synthesized by the traditional solid-state method. The microstructure, piezoelectric, dielectric and ferroelectric properties of Co3+ doped NBNC-x ceramics were systematically investigated. The XRD results showed all ceramics possess bismuth layered structure. The Curie temperature (T-c) gradually enhanced from 778 to 793 degrees C with the addition of Co3+ content. Moreover, the Co3+ doping significantly enhance piezoactivity (d(33)) and ferroelectricity (P-r), and reduce dielectric loss (tan delta). The Na0.5Bi2.5Nb1.93Co0.07O9 ceramic had optimum combinations of electrical properties (e.g., d(33) similar to 20.1 pC/N, P-r similar to 4.22 mu C cm(-2), tan delta similar to 0.31%, Q(m) similar to 3405). These results indicate that the Co3+ doped Na0.5Bi2.5Nb2O9 ceramics has potential application in the high-temperature field.

Automated summary

By doping with Co3+, the Na0.5Bi2.5Nb2-xCoxO9 ceramics showed enhanced piezoelectric, dielectric, and ferroelectric properties, making them potential candidates for high-temperature applications.