Morphotropic phase boundary in (1−x)Bi0.5Na0.5TiO3–xK0.5Na0.5NbO3 lead-free piezoceramics | Zendy

Alain Brice Kounga | Zendy; ShanTao Zhang | Zendy; Wook Jo | Zendy; Torsten Granzow | Zendy; Jürgen Rödel | Zendy

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Morphotropic phase boundary in (1−x)Bi0.5Na0.5TiO3–xK0.5Na0.5NbO3 lead-free piezoceramics

Author(s) -

Alain Brice Kounga,

ShanTao Zhang,

Wook Jo,

Torsten Granzow,

Jürgen Rödel

Publication year - 2008

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.2938064

Subject(s) - phase boundary , materials science , ferroelectricity , antiferroelectricity , piezoelectricity , tetragonal crystal system , phase transition , phase (matter) , ceramic , condensed matter physics , piezoelectric coefficient , ferroelectric ceramics , solid solution , composite material , mineralogy , dielectric , metallurgy , optoelectronics , chemistry , physics , organic chemistry

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.open756

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