Structure of the Fe(II-III) layered double hydroxysulphate green rust two from Rietveld analysis

Simon, Larry J.; François, Michel; Refait, Philippe; Renaudin, Guillaume; Lelaurain, M.; Génin, J.‐M. R.

doi:10.1016/s1293-2558(02)00019-5

Cited by 186 publications

(180 citation statements)

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“…[5][6][7][8][9][10][11] GR is composed of alternate layers of positively charged hydroxide layers and negatively charged interlayers composed of anions and water molecules; the GR species depends on the negatively charged interlayers and water molecules. 7,8) As GR is observed in a lower layer between the upper layer of the corrosion products and the metallic iron substrate, 3,4) GR is formed in aqueous solutions with a relatively low electrochemical potential. Thus, GR is considered to be transformed into iron oxides and oxyhydroxides through dissolution and precipitation of Fe(II) and Fe(III) ions in an aqueous solution by atmospheric oxygen.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Formation and Oxidation of Green Rust (Cl−) Suspension

et al. 2009

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Green rust (GR) containing both ferrous (Fe(II)) and ferric (Fe(III)) ions is formed in an aqueous solution with a relatively low electrochemical potential. In this study, in order to understand the formation and oxidation of GR, a suspension of GR containing chloride ions (GR(Cl Ϫ )) was synthesized and subsequently oxidized by injecting nitrogen gas containing oxygen under different conditions. X-ray diffraction (XRD) measurements were performed for identifying the solid particles formed under different conditions. The results show that the GR(Cl

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Section: Introductionmentioning

confidence: 99%

Characterization of Formation and Oxidation of Green Rust (Cl−) Suspension

et al. 2009

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“…Typically, the chemical formula of iron hydroxysulfate GR (GR2(SO 4 2À )) is determined as Fe(II) 4 Fe(III) 2 (OH) 12 Á[SO 4 2À ,8H 2 O] with a primitive hexagonal cell that includes interlayers composed of two distinct planes of water molecules and sulfate ions. 9) There are several corrosion products of iron-based alloys and steel in an aqueous solution, such as goethite (-FeOOH), akaganeite (-FeOOH), lepidocrocite (-FeOOH), and magnetite (Fe 3 O 4 ), which are iron oxyhydroxides and oxides with different structures. These corrosion products are formed by the oxidation and precipitation of ferrous ions dissolved by electrochemical reactions on steel.…”

Section: Introductionmentioning

confidence: 99%

Characteristic Behavior of Nickel Ions during Transformation of Green Rust to Ferric Oxyhydroxides in Aqueous Solution

et al. 2008

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X-ray diffraction, transmission electron microscopy, and X-ray absorption spectroscopy were used for characterizing the role of nickel in the transformation of Green Rrust 2(SO 4 2À ) (GR2). GR2(SO 4 2À ) was synthesized from the solution of ferric and ferrous sulfate and that of sodium hydroxide. The suspension containing GR2(SO 4 2À ) with and without nickel was oxidized by passing oxygen gas into the aqueous solution, in which GR2(SO 4 2À ) was transformed into ferric oxyhydroxides. The pH and oxidation reduction potential (ORP) values of the aqueous solution were monitored during the transformation of GR2(SO 4 2À ). In addition, the concentrations of iron and nickel in the solution during the transformation of GR2(SO 4 2À ) were analyzed by using inductively coupled plasma atomic emission spectroscopy. The reaction conditions of the GR2(SO 4 2À ) suspension were found to be strongly influenced by the addition of nickel. The reaction product goethite, which was transformed from GR2(SO 4 2À ), also appeared to be stabilized by the addition of nickel. These results indicate that the species of the solid particles formed in the solution are controlled by the addition of foreign elements.

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“…Details of the structure refinement strategy employed are given by Whitfield et al (2010). There have been few previous Rietveld refinements of similar materials, and these have mostly been conducted on Cl --dominant synthetic hydrotalcites (e.g., Ennadi et al 2000;Roussel et al 2000;Simon et al 2003), while Bellotto et al (1996) Note: H2 fixed at sof = 0.5. * Mg on (0,0,0).…”

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confidence: 99%

The crystal structure of stichtite, re-examination of barbertonite, and the nature of polytypism in MgCr hydrotalcites

Mills

Whitfield

Wilson

et al. 2010

American Mineralogist

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The crystal structure of stichtite, re-examination of barbertonite and the nature of polytypism in MgCr hydrotalcites Mills, Stuart J.; Whitfield, Pamela S.; Wilson, Siobhan A.; Woodhouse, Joanne N.; Dipple, Gregory M.; Raudsepp, Mati; Francis, Carl A. American Mineralogist, Volume 96, pages 179-187, 2011 AB S T R A C TStichtite, ideally Mg 6 Cr 2 CO 3 (OH) 16 •4H 2 O, from Stichtite Hill, Tasmania, Australia, and barbertonite, also ideally Mg 6 Cr 2 CO 3 (OH) 16 •4H 2 O, from the Kaapsehoop asbestos mine, South Africa, have been studied by powder X-ray diffraction and their structures have been refined using the Rietveld method. Stichtite from Stichtite Hill crystallizes in the rhombohedral space group R3m, with unitcell parameters a = 3.09575(3) and c = 23.5069(6) Å, V = 195.099(6) Å 3 , with Z = 3/8. Barbertonite from the Kaapsehoop asbestos mine crystallizes in the hexagonal space group P6 3 /mmc. The co-type specimens of barbertonite were found to be intergrown mixtures consisting of barbertonite and stichtite. Unit-cell parameters of barbertonite from the co-type specimens were a = 3.09689(6), c = 15.6193(8) Å, and V = 129.731(8) Å 3 and a = 3.09646(6), c = 15.627(1) Å V = 129.76(1) Å 3 , and Z = ¼. Rietveld refinements of both stichtite and barbertonite show that they are polytypes rather than polymorphs and do not represent distinct mineral species. Several possible nomenclature systems are discussed for the naming of hydrotalcite minerals and groups. Raman band assignments are also presented for stichtite from Stichtite Hill.Stichtite and hydrotalcite minerals make up a large proportion of the ore at the Mount Keith nickel mine in Western Australia. Bulk powder diffraction shows the ore contains 6.1 wt% stichtite and 5.6 wt% iowaite. Hydrotalcite group minerals provide an important potential reservoir of CO 2 . At Mount Keith, the amount of CO 2 mined as stichtite could exceed 45 000 metric tons per year, while exchange of Cl for CO 3 could fix in excess of 40 000 metric tons CO 2 per year if end-member iowaite is reacted to form pyaroaurite.

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Structure of the Fe(II-III) layered double hydroxysulphate green rust two from Rietveld analysis

Cited by 186 publications

References 23 publications

Characterization of Formation and Oxidation of Green Rust (Cl−) Suspension

Characterization of Formation and Oxidation of Green Rust (Cl−) Suspension

Characteristic Behavior of Nickel Ions during Transformation of Green Rust to Ferric Oxyhydroxides in Aqueous Solution

The crystal structure of stichtite, re-examination of barbertonite, and the nature of polytypism in MgCr hydrotalcites

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