Abstract.
Raman spectroscopy was used to investigate the lattice dynamics and structural transformations in bismuth titanate (Bi4Ti3O12) nanocrystals prepared by a chemical coprecipitation technique. The crystal structure of the samples of different grain sizes was determined by X-ray-diffraction analysis. The evolution of the Raman spectrum with grain size was characterized by an intensity decrease, a broadening of the line width, a frequency shift, and the disappearance of the Raman mode. The results revealed the appearance of a size-driven phase transition from orthorhombic to tetragonal phases at a critical size of 44 nm. This result is quite consistent with the X-ray-diffraction measurement and differential thermal analysis. The origin was attributed to the grain-size effect and explained by the surface-energy mechanism.
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Received: 26 June 2002 / Accepted: 18 August 2002 / Published online: 15 January 2003
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Du, Y., Zhang, M., Chen, Q. et al. Investigation of size-driven phase transition in bismuth titanate nanocrystals by Raman spectroscopy . Appl Phys A 76, 1099–1103 (2003). https://doi.org/10.1007/s00339-002-1950-2
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DOI: https://doi.org/10.1007/s00339-002-1950-2