Investigation into the phase structures and temperature stability of BiScO 3 ‐PbTiO 3 ‐based piezoelectric ceramics

Abstract Phase structure has a strong influence on the temperature stability of ceramics; however, their influence on BiScO 3 ‐xPbTiO 3 has been neglected. To meet the requirements for practical applications, (0.98‐x)BiScO 3 ‐xPbTiO 3 ‐0.02Bi(Sn 1/3 Nb 2/3 )O 3 (BS‐xPT‐BSN, 0.59 ≤ x ≤ 0.65) polycrystalline ferroelectrics with rhombohedral phase, morphotropic phase boundary ( Cm and P4mm coexisting), and tetragonal phase has been prepared and studied. The relationship between the phase structures and temperature stability is established from the macro properties as well as the underlying domain behaviors. The results show that the tetragonal phase is not sensitive to temperature because of its stable domains, which is a positive motivator for improving the temperature stability of ceramics. This work provides a new strategy for the design of high‐temperature piezoelectric ceramics in the future.