Original paper
An infrared spectroscopic study of the some Autunite minerals
Frost, Ray L.
Neues Jahrbuch für Mineralogie - Monatshefte Jg. 2004 Heft 4 (2004), p. 145 - 162
28 references
published: Mar 31, 2004
DOI: 10.1127/0028-3649/2004/2004-0145
ArtNo. ESP156200404001, Price: 29.00 €
Abstract
A series of selected autunites with phosphate as the anion have been studied using infrared spectroscopy. Each autunite mineral has its own characteristic spectrum. The spectra for different autunites with the same composition are different. It is proposed that this difference is due to the structure of water and hydrated cations in the interlayer region between the uranyl phosphate sheets. This structure is different for different autunites. The position of the water hydroxyl stretching bands is related to the strength of the hydrogen bonds as determined by hydrogen bond distance. The highly ordered structure of water is also observed in the water HOH bending modes where a high wavenumber bands are observed. The phosphate and uranyl stretching vibrations overlap and are obtained by curve resolution.
Keywords
autunite • metautunite • arsenate • phosphate • vanadate • Raman spectroscopy