Electric field and temperature-induced phase transition in Mn-doped Na BiTiO-5.0 at.%BaTiO single crystals investigated by micro-Raman scattering
Applied Physics Letters, ISSN: 0003-6951, Vol: 104, Issue: 14
2014
- 39Citations
- 17Captures
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Article Description
A micro-Raman scattering technique was used to investigate the electric-field and temperature dependent phase stability of Mn-doped Na BiTiO-5.0at. %BaTiO single crystal. The Ti-O mode was found to exhibit a slight shift at a low electric field (E = 10 kV/cm) and splitting at higher electric field (E≥ 30 kV/cm), ascribed to field-induced local distortion and phase transition, respectively. The temperature-dependent Raman scattering was also measured over a wide range of 150-800 K to study the phase stability of poled samples. A new Raman mode at about 200 cm and an anomaly in intensity of the Ti-O modes were detected at 390 K, indicating a ferroelectric to antiferroelectric phase transition. The frequency shift of TiO octahedral modes implied a transition to a paraelectric state at 550 K. Furthermore, the Ti-O and TiO octahedral modes were found to be sustained in the high-temperature paraelectric state. © 2014 AIP Publishing LLC.
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