Raman spectroscopy has been used to study hydrous sulfate minerals of importance to planetaryscience. These minerals are the mono-, tetra- andheptahydrates of ferrous sulfate and minerals of thejarosite group including Na-, K- and NH4-jarosite.Each mineral has its characteristic spectrum that canbe used for remote identification on planetarysurfaces and is important in the study ofpast geological environment. Effects from the watersof crystallization and hydrogen bonding on the Ramanspectra of ferrous sulfate hydrates have beenstudied. Structural changes and phase transitions inthese hydrates under cryogenic temperatures and highpressures have been studied. In the study ofjarosites, the variations observed in the Ramanspectra at room temperature and cryogenictemperatures are discussed in terms of changes inunit cell dimensions influenced by differentinterlayer cations. The Raman and IR spectra ofK-jarosite after heating to 230 and 400 °C showed thepresence of yavapaiite, which was also detected inthe Raman spectra of K-jarosite at room temperatureunder reduced water vapor pressure in conditions thatcan be found on the surface of Mars.
Raman Spectroscopy - a Study of Iron Sulfate Minerals
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Raman spectroscopy has been used to study hydrous sulfate minerals of importance to planetaryscience. These minerals are the mono-, tetra- andheptahydrates of ferrous sulfate and minerals of thejarosite group including Na-, K- and NH4-jarosite.Each mineral has its characteristic spectrum that canbe used for remote identification on planetarysurfaces and is important in the study ofpast geological environment. Effects from the watersof crystallization and hydrogen bonding on the Ramanspectra of ferrous sulfate hydrates have beenstudied. Structural changes and phase transitions inthese hydrates under cryogenic temperatures and highpressures have been studied. In the study ofjarosites, the variations observed in the Ramanspectra at room temperature and cryogenictemperatures are discussed in terms of changes inunit cell dimensions influenced by differentinterlayer cations. The Raman and IR spectra ofK-jarosite after heating to 230 and 400 °C showed thepresence of yavapaiite, which was also detected inthe Raman spectra of K-jarosite at room temperatureunder reduced water vapor pressure in conditions thatcan be found on the surface of Mars.
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