On the stoichiometry and Pourbaix diagram of Fe(II)-Fe(III) hydroxy-sulphate or sulphate-containing green rust .2. An electrochemical and Mossbauer spectroscopy study

被引：153

作者：

Genin, JMR

Olowe, AA

Refait, P

Simon, L

机构：

[1] UNIV HENRI POINCARE,ESSTIN,DEPT MAT SCI,F-54600 VILLERS LES NANCY,FRANCE

[2] WESTERN MICHIGAN UNIV,COLL ENGN & APPL SCI,DEPT CONSTRUCT ENGN MAT ENGN & IND DESIGN,KALAMAZOO,MI 49008

来源：

CORROSION SCIENCE | 1996年 / 38卷 / 10期

关键词：

iron; thermodynamic diagrams; Pourbaix diagrams; hydroxy-sulphate; green rust; Mossbauer spectroscopy;

D O I：

10.1016/S0010-938X(96)00072-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new preparation of sulphate containing green rust 2, GR2(SO4--), is shown to reach its chemical formula at stoichiometry. It consists of mixing FeCl2 . 4H(2)O and NaOH to precipitate Fe(OH)(2) before adding immediately Na2SO4. E(h) and pH vs time curves are recorded during oxidation: the formula is established to be [Fe(II)(4) Fe(III)(2) (OH)(12)](++) . [SO4 . 2H(2)O](--). The chemical potential is determined to be mu(0)[GR2(SO4--)] = -1014500 +/- 2500 cal mol(-1) and the Pourbaix diagram of iron in sulphated aqueous media is drawn. Mossbauer spectra display two quadrupole doublets in the 2:1 intensity ratio attributed to ferrous and ferric states, respectively. The unique ferrous environment which is detected indicates that all Fe++ ions are in the first neighbourhood of one oxygen atom which belongs to a SO2-- anion or to a water molecule. Copyright (C) 1996 Elsevier Science Ltd

引用

页码：1751 / 1762

页数：12

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[2]

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[3]

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