LAUSR

The phase boundaries within (Bi0.5Na0.5TiO3)x(BaTiO3)y(SrTiO3)1−x−y with x ≥ 0.68 have been outlined. This was achieved using a combinatorial sample fabrication method and scanning synchrotron X-ray diffraction to rapidly characterise crystallographic structures over a large region of phase space. A parametric refinement method was used to clearly outline the phase boundaries as a function of the composition. The pseudo-cubic structure from the high strain non-ergodic Bi0.5Na0.5TiO3-BaTiO3 composition extends into the phase diagram with doping of SrTiO3, with regions of tetragonal and rhombohedral in the BaTiO3 and Bi0.5Na0.5TiO3 ends, respectively. This information can be used in conjunction with further compositional modifications to develop high strain piezoceramics that make use of electric-field-induced phase transformations and further understand the mechanisms in ergodic vs non-ergodic relaxors.