| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1740700 | Progress in Nuclear Energy | 2014 | 7 Pages |
•Systematic spectroscopic investigations of the lanthanide orthophosphates.•Improvement of expected linear correlation of infrared wavenumbers versus ionic radii.•Crystal str. D6 of hydrated LnPO4 is challenged: existence of weak ν1 in IR spectra.•Discrete fluorescence bands observed in EuPO4 Raman spectrum.
Raman and infrared spectroscopic investigations were performed on synthetic lanthanide orthophosphates (LnPO4) within this study. Seven monoclinic monazite-type phosphates (Ln = La–Gd) were synthesised via precipitation route in aqueous solution at room temperature. Linear correlation between Raman band positions and the effective cationic radii of the Ln3+ was observed. New infrared spectroscopic data confirmed the expected steady increase of the LnPO4 wavenumbers regarding the Ln atomic number.
