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Raman spectroscopic study of the uranyl carbonate mineral čejkaite and its comparison with synthetic trigonal Na 4 [UO 2 (CO 3 ) 3 ]

2009; Wiley; Volume: 41; Issue: 4 Linguagem: Inglês

10.1002/jrs.2349

1097-4555

Jiří Čejka, Jiří Sejkora, Jakub Plášil, Silmarilly Bahfenne, Sara J. Palmer, Ray L. Frost,

Nuclear Materials and Properties

Abstract Raman and infrared spectroscopies were used to characterise two samples of triclinic čejkaite Na 4 [UO 2 (CO 3 ) 3 ] and its synthetic trigonal analogue. The ν 3 (UO 2 ) 2+ mode is not Raman active, whereas both the ν 3 and ν 1 (UO 2 ) 2+ modes are infrared active. UO bond lengths in uranyls were calculated from the spectra obtained and compared with bond lengths derived from crystal structure analyses. From the higher number of bands related to the uranyl and carbonate vibrations, the presence of symmetrically distinct (UO 2 ) 2+ and (CO 3 ) 2− units in both structures is proposed. Copyright © 2009 John Wiley & Sons, Ltd.