A Raman spectroscopic study of the uranyl tellurite mineral schmitterite

Abstract

Raman spectra of schmitterite measured at 298 and 77 K are presented and discussed in detail and in part in comparison with published IR spectrum of synthetic schmitterite. U-O bond lengths in uranyls, calculated with the empirical relations R U-O = f[ν 1 (UO 2 ) 2+ ] Å and R U-O = f[ν 3 (UO 2 ) 2+ ] Å, are close to those inferred from the Xray single crystal structure of synthetic schmitterite and agree also with the data for other natural and synthetic uranyl tellurites.

Raman spectroscopic study of the uranyl tellurite mineral moctezumite PbUO2(TeO3)2

“…[14,15,41] Botto [14] assigned two bands at 937 and 882 cm −1 and one band at 818 cm −1 observed in the infrared spectrum of synthetic schmitterite to the ν 3 and ν 1 (UO 2 ) 2+ , respectively. Frost et al [16] observed corresponding bands in the Raman spectrum of natural schmitterite at 876.3 and 837.6 cm −1 . It may be assumed that observed bands at 799 and/or 780 cm −1 may be also related to the ν 1 (TeO 3 ) 2− symmetric stretching vibration.…”

“…[12,13] The infrared spectrum of synthetic schmitterite was described by Botto [14] and synthetic cliffordite by Botto and Baran. [15] A Raman spectroscopic study of schmitterite was presented by Frost et al [16] The aim of this paper is to present a Raman spectroscopic study of moctezumite, Pb(UO 2 )(TeO 3 ) 2 , complemented with infrared spectroscopic measurement and to relate these spectra to the structure of the mineral. Moctezumite is a monoclinic lead uranyl tellurite mineral, P2 1 /c, with a = 7.813(5), b = 7.061(2), c = 13.775(4) Å, β = 93.7(2) • , Z = 4.…”

A SEM, EDS and vibrational spectroscopic study of the tellurite mineral: Sonoraite Fe3+Te4+O3(OH)·H2O

“…Some previous studies have been undertaken by the authors, using Raman spectroscopy to study complex secondary minerals formed by crystallization from concentrated solutions. The authors have studied sonorite using Raman spectroscopy [13] as well as other tellurite minerals [14][15][16][17][18][19]. In this work we have extending our studies of sonorite by undertaking chemical analysis and electron microscopic studies.…”