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- W1549082624 abstract "In this study, the evolution of field induced mechanisms in lead-free piezoelectric ceramics (1−x)Bi1/2Na1/2TiO3-xBaTiO3 with x = 0.06 and 0.07 was investigated by transmission electron microscopy, neutron, and X-ray diffraction. Preliminary investigations revealed a strong degradation of macroscopic electromechanical properties within the first 100 bipolar electric cycles. Therefore, this structural investigation focuses on a comparative diffraction study of freshly prepared, poled, and fatigued specimens. Transmission electron microscopy and neutron diffraction of the initial specimens reveal the coexistence of a rhombohedral and a tetragonal phase with space group R3c and P4bm, respectively. In situ electric field X-ray diffraction reveals a pronounced field induced phase transition from a pseudocubic state to a phase composition of significantly distorted phases upon poling with an external electric field of 4 kV/mm. Although the structures of the two compositions are pseudocubic and almost indistinguishable in the unpoled virgin state, the electric field response shows significant differences depending on composition. For both compositions, the application of an electric field results in a field induced phase transition in the direction of the minority phase. Electric cycling has an opposite effect on the phase composition and results in a decreased phase fraction of the minority phase in the fatigued remanent state at 0 kV/mm." @default.
- W1549082624 created "2016-06-24" @default.
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- W1549082624 date "2015-06-01" @default.
- W1549082624 modified "2023-10-17" @default.
- W1549082624 title "Cyclic electric field response of morphotropic Bi1/2Na1/2TiO3-BaTiO3 piezoceramics" @default.
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- W1549082624 doi "https://doi.org/10.1063/1.4922145" @default.
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