The high-temperature phase transition in samarium fluoride, : structural and vibrational investigation
Year: 1998
Type: article
Abstract: (samarium fluoride) exhibits orthorhombic symmetry (space group Pnma ; type) at room temperature and rhombohedral symmetry (space group type) at high temperature. In this paper we describe a study of the structural phase transition mechanism occurring in this compound performed by means of differential thermal analysis, x-ray diffraction and Raman scattering. The transition temperature was determined to be and the first-order character of the orthorhombic-rhombohedral phase transition was confirmed. The crystal structure of was refined in the two phases using a Rietveld powder diffraction method. The correlation between the coordination polyhedra appropriate to the two structure types has been established and a proposed transition mechanism is described in this paper. Moreover, a full vibrational investigation of both phases of is presented together with a group theory analysis.
Authors: K Rotereau, Ph Daniel, A Desert, J Y Gesland
Institution: Le Mans Université
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2010846579