Raman spectroscopic investigation on Jarosite-Yavapaiite stability

被引：22
作者：
Chio, Chi Hong [2 ]
Sharma, Shiv K. [1 ]
Ming, Li-Chung [1 ]
Muenow, David W. [2 ]
机构：
[1] Univ Hawaii, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA
[2] Univ Hawaii, Dept Chem, Honolulu, HI 96822 USA
来源：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2010年 / 75卷 / 01期
关键词：
Jarosite; Yavapaiite; Raman spectroscopy; Infrared spectroscopy; X-ray diffraction; CRYSTAL-STRUCTURE; MERIDIANI-PLANUM; HYDRONIUM JAROSITE; ALUNITE; SPECTRA;
D O I：
10.1016/j.saa.2009.10.006
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
The stability of synthetic Jarosite (KFe3(SO4)(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 (2.0 x 10(-2) Tort), 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(SO4)(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. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：162 / 171
页数：10
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