Abstract
The results of a powder x-ray diffraction study of the evolutionof the crystal structure in pyrochlore-free single-phase powders of(1−x)[Pb(Fe1/2Nb1/2)]O3–xPbTiO3 (PFN–xPT)are presented. Rietveld analysis of the powder diffraction data reveals that the morphotropic phase transitionin PFN–xPT corresponds to a change of structure fromMA-type monoclinicwith Cm space groupto tetragonal with P4mm space group at 0.06<x<0.08. It is argued that this monoclinic phase persists in the entire composition range0.0≤x≤0.06, as evidenced by the presence of anomalous broadening of the 200profile. The similarity of the morphotropic phase boundary (MPB) inPFN–xPT withthat in the Pb(ZrxTi1−x)O3 (PZT) is pointed out.
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