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Article Dans Une Revue Materials Année : 2020

Electric-Field-Induced Phase Transformation and Frequency-Dependent Behavior of Bismuth Sodium Titanate-Barium Titanate

Résumé

The electric field response of the lead-free solid solution (1-x)Bi0.53Na0.47TiO3-xBaTiO(3) (BNT-BT) in the higher BT composition range with x = 0.12 was investigated using in situ synchrotron X-ray powder diffraction. An introduced Bi-excess non-stoichiometry caused an extended morphotropic phase boundary, leading to an unexpected fully reversible relaxor to ferroelectric (R-FE) phase transformation behavior. By varying the field frequency in a broad range from 10(-4) up to 10(2) Hz, BNT-12BT showed a frequency-dependent gradual suppression of the field induced ferroelectric phase transformation in favor of the relaxor state. A frequency triggered self-heating within the sample was found and the temperature increase exponentially correlated with the field frequency. The effects of a lowered phase transformation temperature TR-FE, caused by the non-stoichiometric composition, were observed in the experimental setup of the freestanding sample. This frequency-dependent investigation of an R-FE phase transformation is unlike previous macroscopic studies, in which heat dissipating metal contacts are used.
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Dates et versions

hal-03727334 , version 1 (19-07-2022)

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Kai-Yang Lee, Xi Shi, Nitish Kumar, Mark Hoffman, Martin Etter, et al.. Electric-Field-Induced Phase Transformation and Frequency-Dependent Behavior of Bismuth Sodium Titanate-Barium Titanate. Materials, 2020, 13 (5), pp.1054-1-1054-14. ⟨10.3390/ma13051054⟩. ⟨hal-03727334⟩
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