Research area | Chemistry and Materials Science and Technology |
Title | Lattice dynamics study of (Gd1-xYbx)(2)O-3(x=0.11) at high pressure |
Publication Type | Journal Article |
Publication year | 2021 |
Authors | Mari-Guaita, J, Gallego-Parra, S, Sans, JA, Velazquez, M, Veber, P, Rodriguez-Hernandez, P, Munoz, A, Manjon, FJ |
Journal | JOURNAL OF ALLOYS AND COMPOUNDS |
Volume | 871 |
Type of Article | Article |
Keywords | (Gd1-xYbx)(2)O-3, High pressure, Raman spectroscopy, Rare earth sesquioxides |
Abstract | In this study, we report an experimental investigation of (Gd1-xYbx)(2)O-3 under high pressure by means of Raman scattering measurements complemented with ab initio calculations in pure Gd2O3. Raman spec-troscopy of compressed (Gd1-xYbx)(2)O-3 (x = 0.11) revealed a first phase transition from the cubic Ia (3) over bar phase (C-type) to the monoclinic C2/m phase (B-type) at 6.2 GPa followed by a second phase transition towards the trigonal P (3) over bar m1 phase (A-type) at 9.8 GPa. This sequence of phase transitions is different to that pre-viously reported for pure Gd2O3. A phase transition from the trigonal to the monoclinic phase is observed on downstroke, so the B-type phase remains metastable at room pressure, as observed in all C-type rare earth sesquioxides. Theoretical calculations have helped to identify the different polymorphs and to assign the symmetry of the observed first-order Raman-active modes in the three phases. The pressure coefficients of the Raman-active modes of the three phases followed under pressure have been reported and compared to those of pure Gd2O3 and other rare-earth sesquioxides. |
DOI | 10.1016/j.jallcom.2021.159525} |