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Topotatic-like phase transformation of amorphous lead titanate to cubic lead titanate

This paper is available in a repository.
This paper is available in a repository.

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Abstract

The crystallization process of lead titanate (PT) prepared using the polymeric precursor method was investigated using X-ray diffractometry, Raman spectroscopy, electron micros- copy, and X-ray absorption spectroscopy techniques. The results showed that amorphous PT was formed by an O-Ti-O structure composed of fivefold and sixfold oxygen-coordinated titanium. The local structure of the amorphous PT phase was similar to that of the cubic PT phase, i.e., similar coordination number and similar bond lengths, leading to a topotactic-like transformation during the phase transformation from amor- phous to cubic perovskite PT. Because of the low crystalliza- tion temperature, every transformation observed during the crystallization process was associated with a short-range re- arrangement process.