Raman spectroscopic study of the multi‐anion uranyl mineral schroeckingerite

Abstract

Raman spectroscopy complemented with infrared (IR) spectroscopy has been used to study the mineral schroeckingerite. The mineral is a multi-anion mineral and has (UO 2 ) 2+ , (SO 4 ) 2− and (CO 3 ) 2− units in its structure, and bands attributed to these vibrating units are readily identified in the Raman spectra. Symmetric stretching modes at 815, 983 and 1092 cm −1 are assigned to (UO 2 ) 2+ , (SO 4 ) 2− and (CO 3 ) 2− units, respectively. The antisymmetric stretching modes of (UO 2 ) 2+ , (SO 4 ) 2− are not observed in the Raman spectra but may be readily observed in the IR spectrum at 898 and 1180 cm −1 . The antisymmetric stretching mode of (CO 3 ) 2− is observed in the Raman spectrum at 1374 cm −1 , as is also the n 4 (CO 3 ) 2− bending modes at 742 and 707 cm −1 . No n 2 (CO 3 ) 2− bending modes are observed in the Raman spectrum of schroeckingerite. All the spectroscopic evidence points to a highly ordered structure of this mineral.

Raman spectroscopic study of the hydrogen‐arsenate mineral pharmacolite Ca(AsO3OH)·2H2O—implications for aquifer and sediment remediation

“…The aim of this paper is to report the Raman and infrared spectra of pharmacolite and to relate the spectra to the molecular chemistry and the crystal chemistry of this arsenate mineral. The paper follows the systematic research of the large group of supergene minerals16–18 and especially molecular structure of minerals containing oxyanions using IR and Raman spectroscopies 19–32…”

Recent advances in linear and nonlinear Raman spectroscopy. Part IV

“…Dias et al [164] combined micro-Raman and SEM to study the etching anisotropy and thereby determine the age of zircon minerals by the FTM method. Frost et al [165] carried out a Raman spectroscopic study of the uranyl tellurite mineral moctezumite PbUO 2 (TeO 3 ) 2 . Frost and Keeffe used Raman spectroscopy to characterize the structure of the selenite minerals mandarinoite Fe 2 Se 3 O 9 ·6H 2 O [166] and ahlfeldite, NiSeO 3 2H2O.…”

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.…”