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

Physica Status Solidi a-Applications and Materials Science Volume: 210 Issue: 2 Pages: 386-390 Published: 2013

26 de abril de 2013 CDMF Artigo 0

Temperature-dependence-of-the-magnetic-moment — (a) Temperature dependence of the magnetic moment m0 (T) (AC measurements) for Pb(Fe2/3W1/3)O3 and Pb(Fe1/2Nb1/2)O3 ceramics. Insert: zoom in the region between 200–300 K magnetic hysteresis loop at 300 K for PFN. (b) Temperature dependence of the magnetic momentM(T) (DC measurements) for Pb(Fe2/3W1/3)O3 and Pb(Fe1/2Nb1/2)O3.

Writers: Barbara Fraygola; Alexandre Mesquita; Adelino A. Coelho; Ducinei Garcia; Valmor R. Mastelaro; and Jose A. Eiras

Keywords: anelastic; multiferroics; PFN; PFW; XANES

Abstract: Lead-based multiferroics perovskites with nominal compositions Pb(Fe1/2Nb1/2)O3 and Pb(Fe2/3W1/3)O3 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 magnetoelectroelastic 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.

Sobre CDMF 591 Artigos

O CDMF é um dos Centros de Pesquisa, Inovação e Difusão (CEPID) apoiados pela FAPESP. O Centro também recebe investimento do CNPq, a partir do Instituto Nacional de Ciência e Tecnologia dos Materiais em Nanotecnologia (INCTMN).