The transformation of mackinawite into greigite studied by Raman spectroscopy
The transformation of mackinawite into greigite studied by Raman spectroscopy
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DOI：
10.1002/jrs.2729
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发表时间：
2011-03-01
影响因子：
2.5
通讯作者：
Refait, Philippe
中科院分区：
文献类型：
--
作者：
Bourdoiseau, Jacques-Andre;Jeannin, Marc;Refait, Philippe
本研究利用拉曼光谱对麦基那维(FeS)的氧化机理进行了较为准确的研究。考虑了两种实验条件：(1)在室温空气中的氧化和(2)在80℃的酸性缺氧溶液中的氧化。在这两种情况下，氧化过程都是从Mackinawite晶体结构中的Fe(II)离子的原位氧化开始的，并导致含Fe(III)的Mackinawite，(Fe1-3xFe2xS)-Fe-II-S-III。空气中的氧化最终生成Fe(III)氧氢氧化物和单质硫-α-S-8，而云母(Fe_3S_4)是中间化合物。在低氧酸性溶液中，氧化产物与Fe/S浓度比有关。当Fe/S=3/4时，云母是唯一的产物，这使我们能够明确地测定该化合物的拉曼光谱。当Fe/S=1/2时，反应生成黄铁矿FeS_2。版权所有(C)2010 John Wiley&Sons，Ltd.
In this study, Raman spectroscopy was used to precisely understand the mechanisms of oxidation of mackinawite (FeS). Two experimental conditions were considered: (1) oxidation in air at room temperature and (2) oxidation in acidic anoxic solutions at 80 degrees C. In both cases, the oxidation process began by the in situ oxidation of Fe(II) cations inside the crystal structure of mackinawite and led to Fe(III)-containing mackinawite, (Fe1-3xFe2xS)-Fe-II-S-III. The oxidation in air finally led to Fe(III) oxyhydroxides and elemental sulfur alpha-S-8, but greigite (Fe3S4) was observed as an intermediate compound. In anoxic acidic solutions, the product of the oxidation was proved to depend on the Fe/S concentration ratio. For Fe/S = 3/4, greigite was the only product obtained, and this allowed us to determine unambiguously the Raman spectrum of this compound. For Fe/S = 1/2, the reaction led to pyrite FeS2. Copyright (C) 2010 John Wiley & Sons, Ltd.