Lead-free (1-x)Bi 0.5Na 0.5TiO 3-xBiCoO 3 (x=0, 0.015, 0.025, 0.03, 0.035, 0.04, and 0.06) piezoelectric ceramics have been synthesized and their structure and electric properties have been investigated systemically. The rhombohedral-tetragonal morphotropic phase boundary (MPB) locates near x=0.025-0.035. For the ceramics with x=0.025, the saturated polarization (P s), remnant polarization (P r), coercive field (E c), strain(S), piezoelectric constant (d 33), and thickness electromechanical coupling factor (k t) are 40.6μC/cm 2, 35.4 μC/cm 2, 5.25 kV/mm, 0.11%, 107pC/N, and 0.45, respectively. The low temperature humps of relative dielectric constant, which is indicative of T R-T, are becoming inconspicuous gradually with the increasing x and almost disappear at x=0.04. The depolarization temperature T d decreases first and then increases with the increasing x. Our results may be helpful for further work on Bi 0.5Na 0.5TiO 3-based lead-free piezoelectric ceramics.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)