Extending the investigations on Bi-based perovskite solid solutions for high-temperature piezoelectric ceramics, this paper considers the binary solid-solution system (1-x) Bi (Ni12 Ti12) O3 -xPbTi O3 [(1-x) BNT-xPT] for 0.39≤x≤1.00. High-density polycrystalline ceramics were fabricated using conventional solid-state processing methods. These ceramics are then taken for structural and electrical properties and differential scanning calorimetry measurements. A morphotropic phase boundary (MPB) was found at the composition 0.51BNT-0.49PT, with a corresponding paraelectric-ferroelectric phase transition TC ≈400 °C. The electrical poled ceramics demonstrated piezoelectric d33 coefficients≈260 pCN at room temperature for the MPB BNT-PT compositions. Experimental data are also given for the influence of Mn O2 doping to the BNT-PT system close to the MPB compositions, noting an improvement in dielectric losses but a reduction in d33 ≈180 pCN. Tricritical behavior is also identified in the tetragonal phase field, with a TC enhancement above TC ∼495 °C found similar to other Bi (Me′ Me″) O3 -PbTi O3 systems with high MPB transitions.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)