Phase and Structural Behaviour of the PrAlO₃-SmAlO₃System

Abstract

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 PrAlO 3 -SmAlO 3 . Two kinds of solid solutions with rhombohedral and orthorhombic structure exist at room temperature. At elevated temperatures, a continuous phase transition P m3m ↔ R3c and a first-order transformation R3c ↔ P bmn occur in the two respective phases. A sequence of low-temperature phase transformations R3c ↔ Imma ↔ C2/m has been detected in Pr 1−x Sm x AlO 3 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 PrAlO 3 -SmAlO 3 has been constructed.

Lattice crossover and phase transitions in NdAlO3–GdAlO3 system

“…Phase and structural behaviour in the NdAlO 3 −GdAlO 3 pseudobinary system follows well the general trends observed in the related NdAlO 3 −RAlO 3 [24,31] and RAlO 3 −GdAlO 3 [15,32] [47], LaRuO 3 −SrRuO 3 [48] and PrCoO 3 −PrFeO 3 [49].…”