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High resolution in situ X-ray powder diffraction applying synchrotron radiation and differential thermal analysis/scanning calorimetry methods have been used to examine the pseudo-binary system PrAlO3-SmAlO3. Two kinds of solid solutions with rhombohedral and orthorhombic structure exist at room temperature. At elevated temperatures, a continuous phase transition Pm (3) over barm <-> R (3) over barc and a first-order transformation R (3) over barc <-> Pbmn occur in the two respective phases. A sequence of low-temperature phase transformations R (3) over barc <-> Imma <-> C2/m has been detected in Pr1-xSmxAlO3 samples with x < 0.35. Based on in situ powder diffraction and differential thermal analysis/scanning calorimetry data, the phase diagram of the pseudo-binary system PrAlO3-SmAlO3 has been constructed.

Phase and Structural Behaviour of the PrAlO3-SmAlO3System

Phase and Structural Behaviour of the PrAlO₃-SmAlO₃System