Ferroelectric Phase Transition Investigated by Thermal Analysis and Raman Scattering in SrBi2Ta2O9 Nanoparticles

Hua Ke; De Chang Jia; Wen Wang; Yu Zhou

doi:10.4028/www.scientific.net/SSP.121-123.843

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HomeSolid State PhenomenaSolid State Phenomena Vols. 121-123Ferroelectric Phase Transition Investigated by...

Ferroelectric Phase Transition Investigated by Thermal Analysis and Raman Scattering in SrBi₂Ta₂O₉ Nanoparticles

Abstract:

Thermal analysis and Raman spectra were carried out in SrBi2Ta2O9 (SBT) nanoparticles to investigate phase transitions. Two anomalies have been observed in temperature dependence of specific heat for SBT nanoparticles. Under the combination with Raman spectra, it indicates that there exists a new ferroelectric intermediate phase in the phase-transition sequence. So we can conclude that the phase-transition sequence in SBT nanoparticles should be ferroelectric-ferroelectric-paraelectric. Moreover, the size effect was discussed in consideration of inner compressive stress in nanoparticles for this special transition behavior. The calculated results show that the SBT nanoparticles keep the ferroelectricity until the particle size is decreased to 4.2 nm.

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Solid State Phenomena (Volumes 121-123)

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843-846

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https://doi.org/10.4028/www.scientific.net/SSP.121-123.843

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March 2007

Authors:

Hua Ke, De Chang Jia, Wen Wang, Yu Zhou

Keywords:

Compressive Stress, Phase Transition, Soft Mode, SrBi₂Ta₂O₉

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