Raman spectroscopic investigation on Jarosite-Yavapaiite stability.
The stability of synthetic Jarosite (KFe(3)(SO(4))(2)(OH)(6)) at low temperature and reduced atmospheric pressure has been studied by Raman spectroscopy. Jarosite remains stable between 8 and 295 K, provided that the sample is not exposed to reduced atmospheric pressure. When exposed to reduced atmospheric pressure (2.0x10(-2) Torr), however, the conversion of Jarosite into a different mineral is readily detected at room temperature by the appearance of a new Raman peak. The Raman shift of this peak (1032 cm(-1)) matches with that of Yavapaiite (KFe(SO(4))(2)), which can be obtained by thermal decomposition of Jarosite above 473 K. These studies provide a better understanding of the stability of Jarosite subjected to conditions similar to that on the surface of Mars.
Chio
Chi Hong
CH
Department of Chemistry, University of Hawaii, Honolulu, HI 96822, USA.
Sharma
Shiv K
SK
Ming
Li-Chung
LC
Muenow
David W
DW
D001274:Atmospheric Pressure; D018559:Exobiology; D005118:Extraterrestrial Environment / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry; D011188:Potassium / Q000737:chemistry*; D018561:Space Simulation; D013059:Spectrum Analysis, Raman; D013431:Sulfates / Q000737:chemistry*; D013696:Temperature; D014867:Water / Q000737:chemistry
D005290:Ferric Compounds; D013431:Sulfates; C492331:jarosite; D014867:Water; D011188:Potassium