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要旨:
Crystal structure of the Bi1-xPrxFeO3 ceramics of the compositions corresponding
to the threshold concentrations separating the polar rhombohedral
(R3c) and anti-polar orthorhombic (Pbam) phases has been investigated with
X-ray diffraction, transmission electron microscopy and differential scanning
calorimetry measurements performed in a broad temperature range. The
structural study specifies the peculiarities of the temperature-driven transition
into the non-polar orthorhombic (Pnma) phase depending on the structural state
of the compounds at room temperature. The crystal structure analysis reveals
the revival of the anti-polar orthorhombic phase upon the temperature-induced
transition, thus assuming that it can be considered as the bridge phase between
the polar rhombohedral and the non-polar orthorhombic phases.
