Titanium K-edge XAS study on local structure of Pb1-xCaxTiO3 ferroelectric ceramics

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Data

2014-01-01

Autores

Mesquita, Alexandre [UNESP]
Estrada, Flávia Regina
Mastelaro, Valmor Roberto
Eiras, José Antonio
Garcia, Ducinei

Título da Revista

ISSN da Revista

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Editor

Trans Tech Publications Ltd

Resumo

In order to characterize the local structure of Pb1-xCaxTiO3 (PCT) samples, Ti K-edge XANES measurements were performed and showed that Ca incorporation to PbTiO3 structure leads to a decreasing of local distortion of Ti atoms in relation to oxygen atoms at the TiO6 octahedra. Moreover, according to EXAFS measurements, the local structure around Ti atoms exhibits tetragonal symmetry with P4mm space group for samples with x <= 0.475, whereas orthorhombic symmetry with Pbnm space group was observed for x equals to 0.50 and 0.55.

Descrição

Palavras-chave

Pb1-xCaxTiO3, Structural phase transition, XANES, EXAFS

Como citar

Electroceramics Vi. Stafa-zurich: Trans Tech Publications Ltd, v. 975, p. 29-35, 2014.