Fe K-edge X-ray absorption spectroscopy study of Pb(Fe2/3W1/3)O-3-PbTiO3 multiferroic ceramics

Autor(es)

Mesquita, A. ^[1] ; Fraygola, B. M. ^[2] ; Mastelaro, V. R. ^[3] ; Eiras, J. A. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Inst Geociencias & Ciencias Exatas, Rio Claro, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Fis, Grp Ceram Ferroeletr, BR-13560 Sao Carlos, SP - Brazil

^[3] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Physics; v. 113, n. 11 MAR 21 2013.
• Citações Web of Science: 3

Resumo

The present paper is a comprehensive study concerning Fe K-edge X-ray absorption spectroscopy (XAS) measurements, which were performed to characterize the local structure of (1 - x) Pb(Fe-2/3 W-1/3)O-3-xPbTiO(3) samples as a function of temperature and PbTiO3 content. Results obtained by the fits of extended X-ray absorption fine structure consist with rhombohedral symmetry for Pb(Fe2/3W1/3)O-3 composition at temperatures lower than room temperature. This result is in apparent disagreement with X-ray and neutron diffraction characterization which have been reported. This apparent disagreement is related to the fact that XAS probes the short-range order, whereas X-ray diffraction provides structural information about the average structure. Moreover, as the PbTiO3 content increases, a disorder has been detected at local structure of the FeO6 octahedron. Analysis of X-ray absorption near edge structure spectra did not show modifications in intensity nor energy of transitions. (C) 2013 American Institute of Physics. {[}http://dx.doi.org/10.1063/1.4795505] (AU)

• Processo FAPESP: 08/04025-0 - Materiais multifuncionais multiferróicos nanoestruturados: síntese, propriedades, fenomenologia e aplicações
• Beneficiário: José Antonio Eiras
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 10/11187-6 - Determinação do coeficiente de acoplamento magnetoelétrico em materiais multiferróicos monofásicos
• Beneficiário: Barbara Maraston Fraygola
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado