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

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

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 focus...

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Veröffentlicht in:Physica status solidi. A, Applications and materials science Applications and materials science, 2013-02, Vol.210 (2), p.386-390
Hauptverfasser: Fraygola, Barbara, Mesquita, Alexandre, Coelho, Adelino A., Garcia, Ducinei, Mastelaro, Valmor R., Eiras, Jose A.
Format: Artikel
Sprache:eng
Schlagworte:
anelastic
Anelasticity
Fluctuation
Instability
Iron
Joining
Lead (metal)
multiferroics
Perovskites
PFN
PFW
Spectrum analysis
X-rays
XANES
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Zusammenfassung: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.
ISSN:1862-6300
1862-6319
DOI:10.1002/pssa.201228376