Crystal structure, vibrational spectra and optical properties of praseodymium cyclotriphosphate PrP{sub 3}O{sub 9}.3H{sub 2}O
- Laboratoire de Physico-Chimie des Materiaux Luminescents, UMR CNRS No. 5620, Universite Claude-Bernard Lyon 1, 69622 Villeurbanne (France)
- Laboratoire des Procedes Chimiques, Institut National de Recherche Scientifique et Technique, B.P. 95 Hammam-Lif 2050 (Tunisia)
- Centre de Diffractometrie, Universite Claude-Bernard Lyon 1, 69622 Villeurbanne (France)
- Laboratoire de Physico-Chimie Minerale, Faculte des Sciences de Bizerte, 7021 Zarzouna, Bizerte (Tunisia)
Single crystals of the trihydrated praseodymium cyclotriphosphate PrP{sub 3}O{sub 9}.3H{sub 2}O were grown for the first time, using a classical method of aqueous chemistry and characterized by single crystal X-ray diffraction. PrP{sub 3}O{sub 9}.3H{sub 2}O is isostructural with LnP{sub 3}O{sub 9}.3H{sub 2}O (Ln=La, Ce and Nd). It crystallizes in the hexagonal system with space group P{sub 6-}bar (C{sub 3h}{sup 1}), with lattice parameters: a=6.7677(4)A, b=6.7677(4)A, c=6.0501(4)A, V=239.98(3)A{sup 3}, Z=1 and D{sub x}=2.988gcm{sup -3}. The crystal structure is resolved for the first time, with final R(F{sup 2})=0.0175 and R{sub w}(F{sup 2})=0.0417 for 396 independent reflections (F{sub 0}{sup 2}>=2{sigma}(F{sub 0}{sup 2})). The P{sub 3}O{sub 9}{sup 3-} cyclic anions have a plane configuration with C{sub 3h} symmetry. The nearest neighbours of the rare earth ion are six oxygen atoms belonging to the P{sub 3}O{sub 9}{sup 3-} anions. Pr{sup 3+} ions occupy sites with C{sub 3h} symmetry. The energies of the crystal vibrational modes are obtained from infrared (IR) and Raman spectra. Optical absorption measurements and emission spectra under selective excitation in the Pr{sup 3+} (4f{sup 2}) {sup 3}P{sub J} (J=0, 1, 2) levels, at room and liquid-helium temperatures, are reported. The observed fluorescence originates mainly from {sup 3}P{sub 0} with a decay time on the order of 10ns, regardless of temperature.
- OSTI ID:
- 20895241
- Journal Information:
- Materials Research Bulletin, Vol. 41, Issue 7; Other Information: DOI: 10.1016/j.materresbull.2005.12.007; PII: S0025-5408(05)00447-2; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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