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

Abstract:

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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.

Info:

Periodical:

Solid State Phenomena (Volumes 121-123)

Edited by:

Chunli BAI, Sishen XIE, Xing ZHU

Pages:

843-846

DOI:

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

Citation:

H. Ke et al., "Ferroelectric Phase Transition Investigated by Thermal Analysis and Raman Scattering in SrBi2Ta2O9 Nanoparticles", Solid State Phenomena, Vols. 121-123, pp. 843-846, 2007

Online since:

March 2007

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Price:

$35.00

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