Phase transition and chemical order in the ferroelectric perovskite (1-x)Bi(Mg3/4W1/4)O3-xPbTiO3 solid solution system -: art. no. 024101

Building on the ferroelectric family based on the Bi(Me+3)O-3-PbTiO3 solid solutions, the complex solid solution (1-x)Bi(Mg3/4W1/4)O-3-xPbTiO(3) [(1-x)BMW-xPT] was investigated. This system was found to exhibit a broad morphotropic phase boundary at xsimilar to0.48 mol % PbTiO3 with a corresponding Curie temperature of 205 degreesC separating pseudocubic and tetragonal ferroelectric phases. Based on dielectric, x-ray diffraction (XRD), and calorimetric data, a simple dielectric phase field diagram was established. On further structural analysis with diffraction contrast transmission electron microscopy along with XRD, evidence of B-site chemical ordering was found for the (1-x)Bi((MeMe')-Me-')O-3-xPbTiO(3) perovskite family. (C) 2005 American Institute of Physics.