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

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ID: 99805
2020
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Abstract
The electric field response of the lead-free solid solution (1-)BiNaTiO-BaTiO (BNT-BT) in the higher BT composition range with = 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 up to 10 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 T, 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.
Reference Key
lee2020electricfieldinducedmaterials Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lee, Kai-Yang;Shi, Xi;Kumar, Nitish;Hoffman, Mark;Etter, Martin;Checchia, Stefano;Winter, Jens;Lemos da Silva, Lucas;Seifert, Daniela;Hinterstein, Manuel;
Journal Materials (Basel, Switzerland)
Year 2020
DOI
E1054
URL
Keywords
piezoelectricity phase transformation bnt–bt x-ray powder diffraction actuating materials ferroelectrics lead-free piezoceramics relaxor self-heating

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