A Raman spectroscopic study of the uranyl selenite mineral haynesite

✍ Scribed by Ray L. Frost; Matt L. Weier; B. Jagannadha Reddy; Jiří Čejka

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 261 KB
• Volume: 37
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/jrs.1508

✦ Synopsis

The mineral haynesite, a uranyl selenite, has been characterised by Raman spectroscopy at 298 and 77 K. Two bands at 811.5 and 800.2 cm -1 are assigned to the symmetric stretching modes of the (UO 2 / 2+ and (SeO 3 / 2-units respectively. These values give calculated U-O bond lengths of 1.799 and/or 1.801 Å. The broad band at 861.8 cm -1 is assigned to the n 3 antisymmetric stretching mode of the (UO 2 / 2+ (calculated U-O bond length 1.813 Å). Additional bands are observed in the 77 K spectrum. In the spectroscopy of selenite compounds, the position of the antisymmetric stretching vibration occurs at lower wavenumbers than the symmetric stretching mode and thus the band at 740.5 cm -1 is attributed to the n 3 antisymmetric stretching vibration of the (SeO 3 / 2-units. The n 4 and the n 2 vibrational modes of the (SeO 3 / 2-units are observed at 418.5 and 472.1 cm -1 . Bands observed at 278.3, 257.3 and 218.8 cm -1 are assigned to OUO bending vibrations.