Electric-field-induced phase transformation at a lead-free morphotropic phase boundary: Case study in a 93%(Bi0.5Na0.5)TiO3-7% BaTiO3 piezoelectric ceramic
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- Electric-field-induced phase transformation at a lead-free morphotropic phase boundary: Case study in a 93%(Bi0.5Na0.5)TiO3-7% BaTiO3 piezoelectric ceramic
- Daniels, John E.; Jo, Wook; Roedel, Juergen; Jones, Jacob L
- Anisotropic lattices; Domain textures; Electric-field-induced strain; High energy x-ray diffraction; Induced phase transformation; Lead-Free; Lead-free piezoelectric; Macroscopic strains; Micro-structural; Morphotropic phase boundaries; Polycrystalline ceramics; Pseudocubic; Tetragonal symmetries; TiO; Unit cells; Volumetric changes; Zero fields
- Issue Date
- AMER INST PHYSICS
- APPLIED PHYSICS LETTERS, v.95, no.3, pp. -
- The electric-field-induced strain in 93%(Bi0.5Na0.5)TiO3-7%BaTiO3 polycrystalline ceramic is shown to be the result of an electric-field-induced phase transformation from a pseudocubic to tetragonal symmetry. High-energy x-ray diffraction is used to illustrate the microstructural nature of the transformation. A combination of induced unit cell volumetric changes, domain texture, and anisotropic lattice strains are responsible for the observed macroscopic strain. This strain mechanism is not analogous to the high electric-field-induced strains observed in lead-based morphotropic phase boundary systems. Thus, systems which appear cubic under zero field should not be excluded from the search for lead-free piezoelectric compositions.
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