Abstract
Crystal structure of the Bi1−x Pr x FeO3 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.
Highlights
Solid solutions of bismuth ferrite attract persistent scientific interest due to the multiple composition-driven structural transitions which dramatically affect the multiferroic behavior
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 data obtained for the compounds with the dopant concentrations of up to x=0.1 were described by the polar rhombohedral phase model specific to the pristine BiFeO3
Summary
Solid solutions of bismuth ferrite attract persistent scientific interest due to the multiple composition-driven structural transitions which dramatically affect the multiferroic behavior. 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.
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