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Neutron diffraction was used to study the temperature evolution of the structure of (1–x)Pb · (Fe2/3W1/3O3)–(x)PbTiO3 solid solutions of two compositions x = 0.2 and 0.3, in which the existence of the morphotropic phase boundary (MPB) is observed, in the temperature range 90–400 K. It is shown that the system is in the two-phase state, in which the cubic and the tetragonal phases coexist, even at...