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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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Stabilization of the fatigue-resistant phase by CuO addition in (Bi 1/2Na 1/2)TiO 3-BaTiO 3

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Title
Stabilization of the fatigue-resistant phase by CuO addition in (Bi 1/2Na 1/2)TiO 3-BaTiO 3
Author
Ehmke, MatthiasGlaum, JuliaJo, WookGranzow, TorstenRoedel, Juergen
Keywords
Electric fatigue; Electromechanical property; Fatigue behavior; Lead-free material; Macroscopic properties; Rhombohedral phase; Symmetry changes; Symmetry consideration; TiO; Underlying mechanism
Issue Date
2011-08
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.94, no.8, pp.2473 - 2478
Abstract
Bipolar electric fatigue in the lead-free material 0.94(Bi1/2Na1/2) TiO3-0.06BaTiO(3) (BNT-BT) is investigated throughout the first 100 cycles in which a strong degradation of macroscopic electromechanical properties is observed. The addition of 1 mol% CuO successfully stabilizes the fatigue-resistant phase and retains the initial electromechanical properties. In order to explain the underlying mechanisms, two models are proposed: degradation takes place either due to (1) pinning of the domain walls by defect charges or (2) an electric field-induced symmetry change that reduces the amount of rhombohedral phase that dominates the macroscopic properties. This different approach based on symmetry considerations to explain the fatigue behavior has an impact on future fatigue studies that are concerned with novel lead-free materials on the basis of BNT-BT.
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DOI
10.1111/j.1551-2916.2010.04379.x
ISSN
0002-7820
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MSE_Journal Papers
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