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Dynamics of the phase transition in Bi0.5Na0.5TiO3 based on in situ Raman spectroscopy.
- Source :
- Journal of Materials Chemistry C; 10/21/2023, Vol. 11 Issue 39, p13459-13465, 7p
- Publication Year :
- 2023
-
Abstract
- This work aims to provide a thorough analysis of the phase transition dynamics in lead-free Bi<subscript>0.5</subscript>Na<subscript>0.5</subscript>TiO<subscript>3</subscript> by in situ Raman spectroscopy, which is conducted under varying temperature and electric field. All the transition points are proved by the Raman response of phonon vibration, including the depolarization temperature at ∼200 °C, potential transition at ∼280 °C, Curie temperature at ∼320 °C and tetragonal-cubic transition above ∼500 °C. The vibration of A-site ions primarily contributes to the depolarization behavior, which is also responsible for the strong polarity in Bi<subscript>0.5</subscript>Na<subscript>0.5</subscript>TiO<subscript>3</subscript>. The transitions at ∼280 °C and ∼320 °C are confirmed by the phonon vibrations of the Ti–O bonds and the TiO<subscript>6</subscript> octahedra. Meanwhile, the distortion of the Ti–O bonds and TiO<subscript>6</subscript> octahedra under an electric field results in weak polarity. The thermal hysteresis behavior is related to the dynamics of phonon thermal evolution, because of the delayed response of the vibration mode to thermal activation of Ti–O bonds and TiO<subscript>6</subscript> octahedra. The results lay a foundation for understanding the mechanism of the phase transition and polarization in Bi<subscript>0.5</subscript>Na<subscript>0.5</subscript>TiO<subscript>3</subscript>, guiding the design of functional devices for electromechanical applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507526
- Volume :
- 11
- Issue :
- 39
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry C
- Publication Type :
- Academic Journal
- Accession number :
- 172960672
- Full Text :
- https://doi.org/10.1039/d3tc02286b