Morphotropic phase boundary in (1-x)Bi0.5Na0.5TiO3-xK(0.5)Na(0.5)NbO(3) lead-free piezoceramics
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- Morphotropic phase boundary in (1-x)Bi0.5Na0.5TiO3-xK(0.5)Na(0.5)NbO(3) lead-free piezoceramics
- Kounga, Alain Brice; Zhang, Shan-Tao; Jo, Wook; Granzow, Torsten; Roedel, Juergen
- Issue Date
- AMER INST PHYSICS
- APPLIED PHYSICS LETTERS, v.92, no.22, pp. -
- The electromechanical behavior of (1-x)Bi0.5Na0.5TiO3-xK(0.5)Na(0.5)NbO(3) (BNT-KNN) lead free piezoelectric ceramics is investigated for 0 <= x <= 0.12 to gain insight into the antiferroelectric-ferroelectric (AFE-FE) phase transition on the basis of the giant strain recently observed in BNT-based systems. At x approximate to 0.07, a morphotropic phase boundary (MPB) between a rhombohedral FE phase and a tetragonal AFE phase is found. While the piezoelectric coefficient is largest at this MPB, the total strain further increases with increasing KNN content, indicating the field-induced AFE-FE transition as the main reason for the large strain.
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