Crystallization of amorphous bismuth titanate

We studied the transformation of amorphous bismuth titanate by heat treatments. After an as-quenched amorphous sample was annealed at 500 °C, the lowest Raman peak became intense like a boson peak for glass. This fact indicates the formation of intermediate range order. The medium range correlation...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2001-11, Vol.293, p.250-254
Main Authors: Kojima, Seiji, Hushur, Anwar, Jiang, Fuming, Hamazaki, Sinichi, Takashige, Masaaki, Jang, Min-Su, Shimada, Shiro
Format: Article
Language:English
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Summary:We studied the transformation of amorphous bismuth titanate by heat treatments. After an as-quenched amorphous sample was annealed at 500 °C, the lowest Raman peak became intense like a boson peak for glass. This fact indicates the formation of intermediate range order. The medium range correlation length of 7 nm calculated from the boson peak frequency is in agreement with the mean cluster size measured by atomic force microscopy (AFM). The differential thermal analysis (DTA) shows the two-step crystallization at 608 and 830 °C on heating. It suggests the existence of a metastable state. The samples annealed at 770 and 1000 °C are identified as the pyroclore and the layered perovskite structures, respectively. It strongly suggests that at first a three-dimensional (3D) crystalline state appears by nucleation process from a 3D amorphous state and secondly it transforms into the pseudo-2D layered perovskite structure.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(01)00828-6