Structure and property investigation of a Bi-based perovskite solid solution:: (1-x)Bi(Ni1/2Ti1/2)O3-xPbTiO3 -: art. no. 034108

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(Ni1/2Ti1/2)O-3-xPbTiO(3) [(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 T-C approximate to 400 degrees C. The electrical poled ceramics demonstrated piezoelectric d(33) coefficients approximate to 260 pC/N at room temperature for the MPB BNT-PT compositions. Experimental data are also given for the influence of MnO2 doping to the BNT-PT system close to the MPB compositions, noting an improvement in dielectric losses but a reduction in d(33)approximate to 180 pC/N. Tricritical behavior is also identified in the tetragonal phase field, with a T-C enhancement above T-C similar to 495 degrees C found similar to other Bi(Me'Me')O-3-PbTiO3 systems with high MPB transitions. (c) 2005 American Institute of Physics.