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Evolution of crystal structure of Ba and Ti co-doped BiFeO3 ceramics at the morphotropic phase boundary
Authors: D.V. Karpinsky; M.V. Silibin; A.V. Trukhanov; A.L. Zhaludkevich; S.I. Latushka; D.V. Zhaludkevich; V. Sikolenko; V.A. Khomchenko
Ref.: J. Alloys Compd. 803, 1136-1140 (2019)
Abstract: Crystal structure of the Bi1-xBaxFe1-xTixO3 ceramics across the phase boundary region between the polar rhombohedral and pseudo-cubic phases has been investigated by means of X-ray and neutron diffraction, scanning electron microscopy and differential scanning calorimetry techniques. The structural measurements have revealed a decrease in the rhombohedral distortions upon increase in the dopant content followed by the stabilization of the pseudo-cubic phase at x ≥ 0.20. While temperature increase gives rise to the similar pattern of structural changes for the lightly-doped samples, an unpredictable temperature-driven strengthening of the rhombohedral distortions has been found for the compounds belonging to the phase boundary region. The study specifies the peculiarities of the temperature-driven evolution of the crystal structure depending on the structural state of the compounds at room temperature.
