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Evidence for a monoclinic MA to tetragonal morphotropic phase transition in (1−x)[Pb(Fe1/2Nb1/2)O3]–xPbTiO3 ceramics

The results of a powder x-ray diffraction study of the evolution of 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 transition in PFN–xPT corresponds to a change of structure from MA-type monoclinic with Cm space group to tetragonal with P4mm space group at 0.06<x<0.08. It is argued that this monoclinic phase persists in the entire composition range 0.0≤x≤0.06, as evidenced by the presence of anomalous broadening of the 200 profile. The similarity of the morphotropic phase boundary (MPB) in PFN–xPT with that in the Pb(ZrxTi1−x)O3 (PZT) is pointed out.