Phase and Structural Behaviour οf the PrAlO3-SmAlO3 System

T. Basyuka, L. Vasylechkoa, S. Fadeeva, V. Berezovetsb, D. Trotsc and R. Niewad a Lviv Polytechnic National University, 12 Bandera St., 79013 Lviv, Ukraine b Karpenko Physico-Mechanical Institute, 5 Naukova St., 79601 Lviv, Ukraine c Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany d Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany

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High resolution in situ 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 Pm3m ↔ R3c and a first-order transformation R3c ↔ Pbmn occur in the two respective phases. A sequence of low-temperature phase transformations R3c ↔ 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.

DOI: 10.12693/APhysPolA.117.98 PACS numbers: 61.05.Cp, 61.50.Ks, 81.30.Bx