Bih, H. and Bih, L. and Manoun, B. and Azdouz, M. and Benmokhtar, S. and Lazor, P. (2009) Raman spectroscopic study of the phase transitions sequence in Li3Fe2(PO4)3 and Na3Fe2(PO4)3 at high temperature. Journal of Molecular Structure, 936 (1-3). pp. 147-155.

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Abstract

The phase transition properties of A3Fe2(PO4)3 (A = Li, Na) were studied by Raman spectroscopy. Several Raman bands change continuously in 25-400 °C temperature range, indicating a phase transition from the γ, β to the α-phase occurring at this range of temperature. Bands caused by vibrations of phosphate anion and different ions have been found. The spectra analysis reveals that the modes, located at low frequency range 100-400 cm-1, near 500 cm-1 at room temperature, are the most thermo-sensitive. In addition, the modes corresponding to bond valence stretching of (PO4) unit in the frequency region 970-1200 cm-1 show also evolution with temperature but less sensitive than the above ones. It is observed that phosphate groups show some ordering with temperature. According to our Raman study, we can state that each of the compounds LiFeP and NaFeP shows two reversible phase transformations in the temperature range studied. © 2009 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Bond valences; Frequency regions; High temperature; Li<sub>3</sub>Fe<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>; Low frequency range; Na<sub>3</sub>Fe<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>; Phase transition properties; Phosphate anions; Phosphate group; Raman bands; Raman spectroscopic study; Raman studies; Reversible phase transformations; Room temperature; Spectra analysis; Temperature range; Thermo sensitive, Raman scattering; Raman spectroscopy; Spectroscopic analysis, Phase transitions
Subjects: Chemistry
Divisions: SCIENTIFIC PRODUCTION > Chemistry
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:45
URI: http://eprints.umi.ac.ma/id/eprint/2016

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