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

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2002-09-01

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Coorientador

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Amer Ceramic Soc

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The crystallization process of lead titanate (PT) prepared using the polymeric precursor method was investigated using X-ray diffractometry, Raman spectroscopy, electron microscopy, 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 amorphous to cubic perovskite PT. Because of the low crystallization temperature, every transformation observed during the crystallization process was associated with a short-range rearrangement process.

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Inglês

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Journal of the American Ceramic Society. Westerville: Amer Ceramic Soc, v. 85, n. 9, p. 2166-2170, 2002.

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