The vibrational spectra and structural properties of Me7Eu2UO2(PO4)5 crystals |
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Authors: | D. S. Umreiko V. V. Syt’ko K. V. Bokit’ko |
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Affiliation: | (1) A. N. Sevchenko Scientific-Research Institute of Applied Physical Problems, 7, Kurchatova St., 220064 Minsk, Belarus;(2) F. Skorina Gomel State University, Belarus |
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Abstract: | We investigate the vibrational spectra of crystals of ternary orthophosphates Me7Eu2UO2·(PO4)5 (Me–Na, Rb, Cs) obtained by solid-phase synthesis. We show that in these materials the effect of coordination distorts the geometry of the PO 4 3− tetrahedron and decreases its symmetry. We conclude that the PO 4 3− tetrahedrons in Me7Eu2UO2(PO4)5 occupy two nonequivalent positions in the lattice. The character of manifestation and the number of oscillation frequencies observed allow the assumption that they have the C3v- and C2-symmetry. This symmetry of two crystallographically nonequivalent groups of PO 4 3− ensures a complete set of bands in the IR absorption spectra of the crystals investigated. We show that these crystals exhibit chain structural motifs. Translated from Zhurnal Prikladnoi Spektroskopii, Vol, 64, No. 4, pp. 467–470, July–August, 1997. |
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Keywords: | orthophosphates uranyl lanthanides vibrational spectra structural properties |
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