Fe valence fluctuations and magnetoelastic coupling in Pb-based multiferroics perovskites

Autor(es)

Fraygola, Barbara ^[1] ; Mesquita, Alexandre ^[1] ; Coelho, Adelino A. ^[2] ; Garcia, Ducinei ^[1] ; Mastelaro, Valmor R. ^[3] ; Eiras, Jose A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dpto Fis, Grp Ceram Ferroeletr GCFerr, BR-13565670 Sao Carlos, SP - Brazil

^[2] Univ Estadual Campinas, IFGW, LPCM DFA, Campinas, SP - Brazil

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

• Tipo de documento: Artigo Científico
• Fonte: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE; v. 210, n. 2, p. 386-390, FEB 2013.
• Citações Web of Science: 7

Resumo

Lead-based multiferroics perovskites with nominal compositions Pb(Fe1/2Nb1/2)O-3 and Pb(Fe2/3W1/3)O-3 were synthesized following a two-stage method. Magnetic proprieties were investigated and correlated to anelastic proprieties, measured by the conventional pulse-echo method. The discussions are focused in the region around 250 K, where magnetoelectroe-lastic instabilities have been observed. X-ray absorption near-edge structure (XANES) study further indicates that the edge position varies with temperature revealing a fluctuation on the valence of iron ions with the temperature, which can be related to a variation in anelastic and magnetic proprieties. (C) 2012 WILEY-VCH Verlag GmbH \& Co. KGaA, Weinheim (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