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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 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.