Field-induced phase transition in Bi1/2Na1/2TiO3-based lead-free piezoelectric ceramics
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- Field-induced phase transition in Bi1/2Na1/2TiO3-based lead-free piezoelectric ceramics
- Hinterstein, Manuel; Knapp, Michael; Hoelzel, Markus; Jo, Wook; Cervellino, Antonio; Ehrenberg, Helmut; Fuess, Hartmut
- field-induced phase transitions; piezoelectric ceramics
- Issue Date
- JOURNAL OF APPLIED CRYSTALLOGRAPHY, v.43, no., pp.1314 - 1321
- The origin of the electric field-induced strain in the polycrystalline ceramic 0.92Bi(1/2)Na(1/2)TiO(3)-0.06BaTiO(3)-0.02K(1/2)Na(1/2)NbO(3) was investigated using in situ high-resolution X-ray and neutron diffraction techniques. The initially existing tetragonal phase with pseudocubic lattice undergoes a reversible phase transition to a significantly distorted rhombohedral phase under electric field, accompanied by a change in the oxygen octahedral tilting from a 0 a 0 c + to a - a - a - and in the tilting angle. The polarization values for the tetragonal and rhombohedral phases were calculated based on the structural information from Rietveld refinements. The large recoverable electric field-induced strain is a consequence of a reversible electric field-induced phase transition from an almost nonpolar tetragonal phase to a ferroelectrically active rhombohedral phase.
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