Phase transformations in LiH2PO4 (LDP) revealed by Raman spectroscopy

Rawdha Dekhili (1, 2, 3) , T.H. Kauffmann (1) , Hassen Aroui (2, 3) , Marc D. Fontana (1)

1 LMOPS - Laboratoire Matériaux Optiques, Photonique et Systèmes
2 UTM - Université de Tunis El Manar
3 Laboratoire Dynamique Moléculaire et Matériaux Photoniques [Tunis]

We investigate Raman scattering measurements on polycrystalline LiH2PO 4 (LDP) between 30 and 240°C, in order to detect phase transformations. The thermal behavior of main lines in different wavenumber ranges is discussed and analyzed. Raman spectra show two anomalies at 176°C and 210°C, reflecting changes in chemical bonds, and are attributed to progressive polymerization, in agreement with earlier electrical measurements.

Mots clés: Raman spectroscopy; vibrational modes; phosphate compounds; phase transformations

Domaines: Optique / photonique; Chimie

Rawdha Dekhili, T.H. Kauffmann, Hassen Aroui, Marc D. Fontana. Phase transformations in LiH2PO4 (LDP) revealed by Raman spectroscopy. Solid State Communications, 2018, 279, pp.22-26. ⟨10.1016/j.ssc.2018.04.016⟩. ⟨hal-01803857⟩