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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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Morphotropic phase boundary in (1-x)Bi0.5Na0.5TiO3-xK(0.5)Na(0.5)NbO(3) lead-free piezoceramics

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Title
Morphotropic phase boundary in (1-x)Bi0.5Na0.5TiO3-xK(0.5)Na(0.5)NbO(3) lead-free piezoceramics
Author
Kounga, Alain BriceZhang, Shan-TaoJo, WookGranzow, TorstenRoedel, Juergen
Keywords
CERAMICS
Issue Date
2008-06
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.92, no.22, pp. -
Abstract
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.
URI
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DOI
10.1063/1.2938064
ISSN
0003-6951
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MSE_Journal Papers
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