Raman spectra in LiH2PO4 and KLi(H2PO4)2: Mode assignement

Abstract : We report and analyze Raman spectra recorded on crystals of LiH2PO4 (LDP) and KLi(H2PO4)2 (KLDP). We provide a new and complete assignment of Raman lines in both crystals from their behavior as function of temperature. Among internal vibrations, we discern the modes within PO4 tetrahedra, the modes related to Li―O bonds, and those due to the O―H vibrations. In the wavenumber range between 300 and 600 cm−1, the lines associated with O―P―O or Li―O show different temperature dependencies. The bands of PO4 are red‐shifted with increasing temperature according to thermal dilatation, whereas the positions related to Li―O are temperature independent.
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Submitted on : Thursday, November 29, 2018 - 1:50:21 PM
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Rawdha Dekhili, T.H. Kauffmann, Hassen Aroui, M.D. Fontana. Raman spectra in LiH2PO4 and KLi(H2PO4)2: Mode assignement. Journal of Raman Spectroscopy, Wiley, 2019, 50 (3), pp.447-453. ⟨10.1002/jrs.5522⟩. ⟨hal-01930469⟩

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