Molecular structure of segnitite: A Raman spectroscopic study

Frost, Raymond; Weier, Matt L.; Martens, Wayde N.; Mills, Stuart J.

doi:10.1016/j.molstruc.2005.06.006

Cited by 19 publications

(15 citation statements)

References 40 publications

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“…With these aims, we have prepared synthetic alunite and jarosite compounds, studied them with Raman and IR vibrational spectroscopy, and characterized them by chemical analysis and X-ray diffraction (XRD). We use synthetic compounds to achieve sample purity and to control the conditions of formation, in keeping with supergroup minerals and compounds (e.g., Omori & Kerr 1963, Adler & Kerr 1965, Powers et al 1975, Serna et al 1986, Breitinger et al 1997, Sasaki et al 1998, Drouet & Navrotsky 2003, Drouet et al 2004, Bishop & Murad 2005, Frost et al 2005a, 2005b, 2005c, Savage et al 2005, Hudson-Edwards et al 2008). The rationale for these studies is that substitution in the structure of alunite and jarosite will affect the vibrational IR and Raman spectra, and the changes observed will depend both on the substituting ions and on their position within the structure, as well as on temperatures of formation.…”

Section: Background Informationmentioning

confidence: 99%

RAMAN AND IR SPECTROSCOPIC STUDIES OF ALUNITE-SUPERGROUP COMPOUNDS CONTAINING Al, Cr3+, Fe3+ AND V3+ AT THE B SITE

Murphy¹,

Smith²,

Hudson‐Edwards³

et al. 2009

The Canadian Mineralogist

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Raman and IR spectroscopies, X-ray diffraction and chemical analysis have been used to characterize synthetic compounds of the alunite supergroup of formula AB 3 (SO 4 ) 2 (OH) 6 , with A = Na + , K + , H 3 O + and B = Al, Cr 3+ , Fe 3+ , V 3+ . For each A-site cation, the proportion of B-site vacancies decreases in the same order as the effective ionic radius of the B-site cations (Al > Cr > Fe > V). Raman and IR spectra of the compounds with B = Al and Fe 3+ (alunite-and jarosite-group phases) show very close agreement with previously published spectra. The spectra for Cr-and V-based analogues show similarities to the alunite-and jarosite-group phases, and particularly the latter. The Raman and IR spectra are similar in the high-wavenumber ranges (around 3400-3500 cm -1 ), but are different in the intermediate and, particularly, the lower ranges, <700 cm -1 , probably owing to the different responses of Raman and IR to SO 4 and metal-O (M-O) group symmetries. The a parameter correlates well with n 1 SO 4 , n 2 SO 4 and n 4 SO 4 Raman and n 4 SO 4 IR wavenumbers. There are differences in the OH-stretching regions, and shifts in the main nSO 4 and M-O peaks of the alunite-group phases, and Cr-, Fe-and V-based analogues with substitution of K, Na or H 3 O at the A site in the Raman and IR spectra. Raman and IR spectroscopies are therefore useful in distinguishing these compounds. SOmmaiReNous nous sommes servis de la spectroscopie Raman, la spectroscopie infrarouge, la diffraction X et l'analyse chimique pour caractériser les composés synthétiques du supergroupe de l'alunite, dont la formule générale est AB 3 (SO 4 ) 2 (OH) 6 , avec A = Na + , K + , H 3 O + et B = Al, Cr 3+ , Fe 3+ , V 3+ . Pour chaque cation au site A, la proportion de lacunes au site B diminue dans la même séquence que le rayon ionique du cation logeant au site B (Al > Cr > Fe > V). Les spectres de Raman et IR de ces composés ayant B = Al et Fe 3+ , c'est-à-dire les composés des groupes alunite et jarosite, concordent très étroitement avec les spectres déjà §

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Section: Background Informationmentioning

confidence: 99%

RAMAN AND IR SPECTROSCOPIC STUDIES OF ALUNITE-SUPERGROUP COMPOUNDS CONTAINING Al, Cr3+, Fe3+ AND V3+ AT THE B SITE

Murphy¹,

Smith²,

Hudson‐Edwards³

et al. 2009

The Canadian Mineralogist

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“…A typical deposit is found in the El Jaroso ravine. A recent study characterized jarosites in terms of their UV-Visible and NIR spectroscopy [31] whereas other recent studies have characterized selected evaporate minerals by thermal analysis and Raman spectroscopic techniques [32][33][34][35]. Thus it is important to understand the NIR spectroscopy of the efflorescent sulphate minerals jarosites and halotrichites since these minerals are formed in mineral waste deposits, slag wastes and other environmental situations [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the sulphate mineral amarantite – using infrared, Raman spectroscopy and thermogravimetry

Frost

López

Scholz

et al. 2013

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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The mineral amarantite Fe2(3+)(SO4)O·7H2O has been studied using a combination of techniques including thermogravimetry, electron probe analyses and vibrational spectroscopy. Thermal analysis shows decomposition steps at 77.63, 192.2, 550 and 641.4°C. The Raman spectrum of amarantite is dominated by an intense band at 1017 cm(-1) assigned to the SO4(2-) ν1 symmetric stretching mode. Raman bands at 1039, 1054, 1098, 1131, 1195 and 1233 cm(-1) are attributed to the SO4(2-) ν3 antisymmetric stretching modes. Very intense Raman band is observed at 409 cm(-1) with shoulder bands at 399, 451 and 491 cm(-1) are assigned to the ν2 bending modes. A series of low intensity Raman bands are found at 543, 602, 622 and 650 cm(-1) are assigned to the ν4 bending modes. A very sharp Raman band at 3529 cm(-1) is assigned to the stretching vibration of OH units. A series of Raman bands observed at 3025, 3089, 3227, 3340, 3401 and 3480 cm(-1) are assigned to water bands. Vibrational spectroscopy enables aspects of the molecular structure of the mineral amarantite to be ascertained.

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“…Some previous studies have been undertaken by the authors using Raman spectroscopy to study complex secondary minerals formed by crystallisation from concentrated sulphate solutions [12][13][14][15][16][17][18][19][20][21]. Further hot stage Raman spectroscopy is most useful for the study of the thermal decomposition of minerals [22][23][24][25][26][27]. Thermal analysis has proven most useful for the analysis of the thermal decomposition of minerals [28][29][30][31][32][33][34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of smithsonite and hydrozincite

Hales

Frost

2008

J Therm Anal Calorim

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Abstract:Thermogravimetric analysis of synthetic smithsonite and hydrozincite, two secondary minerals of zinc, was used to determine their relative thermal stability. Thermal decomposition of smithsonite occurs at 293 °C and hydrozincite at 220 °C showing that the carbonate mineral is more stable than the hydroxy-carbonate mineral hydrozincite. Hot stage Raman spectroscopy confirms the decomposition of smithsonite and hydrozincite by 300 and 250 °C respectively. Thermogravimetry shows that a small amount of hydrozincite is formed during the synthesis of smithsonite. No evidence is found for the separate loss of the carbonate and hydroxyl units from hydrozincite.

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Molecular structure of segnitite: A Raman spectroscopic study

Cited by 19 publications

References 40 publications

RAMAN AND IR SPECTROSCOPIC STUDIES OF ALUNITE-SUPERGROUP COMPOUNDS CONTAINING Al, Cr3+, Fe3+ AND V3+ AT THE B SITE

RAMAN AND IR SPECTROSCOPIC STUDIES OF ALUNITE-SUPERGROUP COMPOUNDS CONTAINING Al, Cr3+, Fe3+ AND V3+ AT THE B SITE

Characterization of the sulphate mineral amarantite – using infrared, Raman spectroscopy and thermogravimetry

Thermal analysis of smithsonite and hydrozincite

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