Local order of Pb1-xLaxZr0.40Ti0.60O3 ferroelectric ceramic materials probed by X-ray absorption and Raman spectroscopies

Autor(es)

Mesquita, A. ^{[1, 2, 3, 4]} ; Michalowicz, A. ^{[1, 4]} ; Pizani, P. S. ^[5] ; Provost, K. ^{[1, 4]} ; Mastelaro, V. R. ^[2]

Afiliação do(s) autor(es)

^[1] CNRS, Inst Chim & Mat Paris Est, F-94320 Thiais - France

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-05508 Sao Paulo - Brazil

^[3] Univ Estadual Paulista, Dept Fis, Inst Geociencias & Ciencias Exatas, Rio Claro, SP - Brazil

^[4] Univ Paris Est Creteil, F-94320 Thiais - France

^[5] Univ Fed Sao Carlos, Dept Fis, BR-13560 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 582, p. 680-687, JAN 5 2014.
• Citações Web of Science: 5
• Assunto(s): Materiais ferroelétricos Espectroscopia Raman

Resumo

This paper reports on the structural characterization of Pb1-xLaxZr0.40Ti0.60O3 (PLZT) ferroelectric ceramic compositions prepared by the conventional solid state reaction method. X-ray absorption spectroscopy (XAS) and Raman spectroscopy were used to probe the local structure of PLZT samples that exhibits a normal and relaxor ferroelectric behavior. From the Zr K-edge and Pb L-III-edge EXAFS spectra, a considerable dissymmetry of Zr and Pb sites was observed in all samples, including those showing a long-range order cubic symmetry and a relaxor behavior. The Raman spectroscopy results confirmed the existence of a local disorder in all PLZT samples through the observation of Raman active vibrational modes. The variation in the intensity of the E(TO3) mode in the PLZT relaxor samples indicates that the process of correlation between nanodomains stabilizes at temperatures lower than T-m. (c) 2013 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/00011-1 - Síntese e caracterização estrutural de compostos ferroelétricos relaxores Pb1-xRxZr0,40Ti0,60O3 (R = La, BA)
• Beneficiário: Alexandre Mesquita
• Modalidade de apoio: Bolsas no Brasil - Doutorado