Complex perovskite ferroelectrics (1-x)Pb(Mg_1/3Nb_2/3)O₃-xPbTiO₃ (Abbr. PMN-PT) exhibit superior piezoelectric and electromechanical properties, which triggered an intensive interest of applications [1]. Therefore, great attention has been paid to microstructures related to special properties, of which the true symmetry is still under debate [2,3].

The transformation of spontaneous ferroelectric to relaxor (FE-R) state was evidenced as a (weak) first order phase transition in the PMN-rich side with unkown R(X) or C(X) phase [4,5] of the phase diagram associated with two branches. A detailed study at lower temperature than the transition temperature T_FE-R in the PMN-PT solid solutions was carried out using the X-ray Rietveld technique from the PMN end to PMN-PT (x=0.26), which is near the morphotropic phase boundary. A systematic structure analysis carried out for this series revealed the development of a polar state. Data analysis using Rietveld method combined with electron diffraction has been further performed for compositions falling in the region between the two temperatures which was dedicated to understand the structure changes within the phase diagram.

Keywords X-ray Rietveld method, electron diffraction, PMN-PT

References

[1] R.F.Service, Science 275, 1878, 1880 (1997).

[2] A.K. Singh, D. Pandey, O. Zaharko, Phys. Rev. B 74, 024101 (2006)

[3] B. Noheda, D.E. Cox, Phase Transit. 79, 5 (2006)

[4] G. Xu, D. Viehland, J. F. Li, P. M. Gehring, and G. Shirane, Phys. Rev. B 68, 212410 (2003).

[5] F. Bai, N. Wang, J. Li, D. Viehland, P.M. Gehring, G. Xu and G. Shirane, J. Appl. Phys. 96, 1620, (2004).

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