Heat capacity and enthalpy of the ternary system ferrous sulfate heptahydrate, sulfuric acid, and water

Bhattacharyya, Sulapani; Bhattacharyya, Souvik

doi:10.1021/je60081a026

Cited by 38 publications

(3 citation statements)

References 5 publications

(6 reference statements)

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“…The effect of sulfuric acid in solutions with other salts is remarkable. Bhattacharyya and Bhattacharyya (1979) showed that higher concentrations of the acid (25%) in an aqueous system also containing ferrous sulfate decreased the heat capacity of the solution.…”

Section: Heat Capacity (C P )mentioning

confidence: 99%

Rheological and Thermal Properties of Icy Materials

et al. 2010

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Laboratory measurements of physical properties of planetary ices generate information for dynamical models of tectonically active icy bodies in the outer solar system. We review the methods for measuring both flow properties and thermal properties of icy planetary materials in the laboratory, and describe physical theories that are essential for intelligent extrapolation of data from laboratory to planetary conditions. This review is structured with a separate and independent section for each of the two sets of physical properties, rheological and thermal. The rheological behaviors of planetary ices are as diverse as the icy moons themselves. High-pressure water ice phases show respective viscosities that vary over four orders of magnitude. Ices of CO 2 , NH 3 , as well as clathrate hydrates of CH 4 and other gases vary in viscosity by nearly ten orders of magnitude. Heat capacity and thermal conductivity of detected/inferred compositions in outer solar system bodies have been revised. Some low-temperature phases of minerals and condensates have a deviant thermal behavior related to paramount water ice. Hydrated salts have low values of thermal conductivity and an inverse dependence of conductivity on temperature, similar to clathrate hydrates or glassy solids. This striking behavior may suit the dynamics of icy satellites.

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Section: Heat Capacity (C P )mentioning

confidence: 99%

Rheological and Thermal Properties of Icy Materials

et al. 2010

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“…Interest in such minerals and their thermal stability rests with the possible identification of these minerals and dehydrated paragenetically related minerals on planets and on Mars. There have been many studies on related minerals such as the Fe(II) and Fe(III) sulphate minerals [17][18][19][20][21][22]. The formation of these minerals can occur through microbiological reduction of pyrite [23,24].…”

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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“…There have been many studies on related minerals such as the Fe(II) and Fe(III) sulphate minerals. [11][12][13][14][15][16] The formation of these minerals can occur through microbiological reduction of pyrite. 17,18 Fe minerals such as Fe 2+ , Fe 3+ hydroxysulfate (copiapite), Fe 3+ oxyhydroxide (goethite), KFe 3+ hydroxysulfate (jarosite) and Fe 3+ hydroxysulfate (schwertmannite) may form as weathering products in a pyrite oxidation process.…”

Section: Introductionmentioning

confidence: 99%

Sulphate Efflorescent Minerals from the El Jaroso Ravine, Sierra Almagrera, Spain—A Scanning Electron Microscopic and Infrared Spectroscopic Study

Frost

Wain

Reddy

et al. 2006

Journal of Near Infrared Spectroscopy

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Near infrared (NIR) spectroscopy is a technique that can be utilised to analyse minerals remotely through a fi bre-optic cable.A suite of sulphate effl orescent minerals from the El Jaroso ravine, Sierra Almagrera, Spain have been analysed by ultraviolet, visible, NIR and mid infrared (IR) spectroscopy. Such a suite of minerals may be used to model the types of mineral deposits on Mars. The minerals were analysed by scanning electron microscopy and X-ray microanalysis (EDX) before spectroscopic analysis. Halotrichite was observed and the EDX analyses showed the mineral to be a mixture of heinrichite and pickingerite. The NIR spectrum of the efl orescencia sample showed the sulphate deposit to be composed of a mixture of jarosite and halotrichites. The 7400 to 6400 cm -1 (1351 to 1562 nm) NIR spectral region of the effl orescent sulphate minerals can be used to characterise the various sulphate deposits. The detection of a band at 8338 cm -1 (1199 nm) reveals the presence of ferrous iron in jarosite which is unusual for the jarosite minerals. This can be caused by ferric iron reduction by thermophilic iron-oxidising bacteria. Mid IR spectra showed the characteristic OH stretching bands of the jarosites and the effl orescent mixtures. The position of water stretching vibrations at 2900 cm -1 and lower shows strong hydrogen bonding as is also evidenced by water bending modes at around 1682 cm -1 .

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Heat capacity and enthalpy of the ternary system ferrous sulfate heptahydrate, sulfuric acid, and water

Cited by 38 publications

References 5 publications

Rheological and Thermal Properties of Icy Materials

Rheological and Thermal Properties of Icy Materials

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

Sulphate Efflorescent Minerals from the El Jaroso Ravine, Sierra Almagrera, Spain—A Scanning Electron Microscopic and Infrared Spectroscopic Study

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