Crystal Structure of Birnessite From the Pacific Ocean

Chukhrov, F. V.; Sakharov, B. A.; Горшков, А. И.; Drits, Victor A.; Dikov, Yu. P.

doi:10.1080/00206818509466485

Cited by 44 publications

(48 citation statements)

References 4 publications

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“…The agreement between calculated and experimental XRD patterns was first improved using a trial-and-error procedure, as recommended by Drits and Tchoubar (1990) for defective structures. This approach was successfully applied to natural and synthetic one-layer hexagonal birnessites (Chukhrov et al 1985;Manceau et al 1997;Lanson et al 2000), as well as to four-layer monoclinic Ca-exchanged birnessite (Drits et al 1998). Details on the program used to calculate XRD patterns, as well as on the fitting procedure, are given by Drits et al (1998).…”

Section: Simulation Of Xrd Patternsmentioning

confidence: 99%

“…It can form under a variety of physico-chemical conditions and is consequently present in different geological environments such as soils (Taylor et al 1964;Chukhrov and Gorshkov 1981;Cornell and Giovanoli 1988), marine manganese nodules and micro-nodules (Burns and Burns 1976;Glover 1977;Chukhrov et al 1978Chukhrov et al , 1985Chukhrov et al , 1989Drits et al 1985), and Mn-rich ore deposits (Usui and Mita 1995). Further, birnessite possesses unique surface charge (Healy et al 1966;Murray 1974), cation exchange (Balistrieri and Murray 1982;Le Goff et al 1996), and redox (Stone et al 1994) properties, which makes it highly reactive with respect to sorption phenomena (Paterson et al 1994;Tu et al 1994).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structure of synthetic Na-birnessite: Evidence for a triclinic one-layer unit cell

Lanson

Drits

Feng

et al. 2002

American Mineralogist

162

161

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The structure of a synthetic analogue of sodium birnessite (NaBi) was studied by powder X-ray diffraction (XRD). It is shown that NaBi has a one-layer triclinic structure with sub-cell parameters a P = 2.9513(4) Å, b P = 2.9547(4) Å, c P = 7.334(1) Å, α P = 78.72(2)°, This splitting is consistent with the modulated structure of both NaBi types, which arises from the periodic displacement of interlayer species along the b axis with a periodicity λ = 6b ).3

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Section: Simulation Of Xrd Patternsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure of synthetic Na-birnessite: Evidence for a triclinic one-layer unit cell

Lanson

Drits

Feng

et al. 2002

American Mineralogist

162

161

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“…9 Layered Mn oxides have primarily edge-linked Mn octahedra and, until recently, the structures of these layered Mn oxides were unknown (Figure 2.1). 15 They have a lamellar structure of Mn octahedral layers with interlayer water and hydroxyl groups. In nature, the layered Mn oxides tend to be poorly crystalline and of small particle size but this behavior results in high surface areas per volume.…”

Section: Influence Of Mn Oxide Structurementioning

confidence: 99%

Characterization of Plutonium, Neptunium, Strontium on Manganese Solids from Permanganate Reduction

Duff¹

2003

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“…The µ-XRD patterns were simulated following the trial-and-error approach developed by Drits and Tchoubar (1990), and applied previously to natural and synthetic phyllomanganates (Chukhrov et al, 1985;Manceau et al, 1997;Drits et al, 1998;Lanson et al, 2000Lanson et al, , 2002aGaillot et al, 2003Gaillot et al, , 2005Gaillot et al, , 2007Villalobos et al, 2006). Details on the program and fitting procedure can be found in the articles by Drits et al (1998) andPlançon (2002).…”

Section: Data Processingmentioning

confidence: 99%

Formation of Zn–Ca phyllomanganate nanoparticles in grass roots

Lanson

Marcus

Fakra

et al. 2008

Geochimica et Cosmochimica Acta

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International audienceIt is now well established that a number of terrestrial and aquatic microorganisms have the capacity to oxidize and precipitate Mn as phyllomanganate. However, this biomineralization has never been shown to occur in plant tissues, nor has the structure of a natural Mn(IV) biooxide been characterized in detail. We show that the graminaceous plant Festuca rubra (red fescue) produces a Zn-rich phyllomanganate with constant Zn:Mn and Ca:Mn atomic ratios (0.46 and 0.38, respectively) when grown on a contaminated sediment. This new phase is so far the Zn-richest manganate known to form in nature (chalcophanite has a Zn:Mn ratio of 0.33) and has no synthetic equivalent. Visual examination of root fragments under a microscope shows black precipitates about ten to several tens of microns in size, and their imaging with backscattered and secondary electrons demonstrates that they are located in the root epidermis. In situ measurements by Mn and Zn K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy and X-ray diffraction (XRD) with a micro-focused beam can be quantitatively described by a single-phase model consisting of Mn(IV) octahedral layers with 22% vacant sites capped with tetrahedral and octahedral Zn in proportions of 3:1. The layer charge deficit is also partly balanced by interlayer Mn and Ca. Diffracting crystallites have a domain radius of 33 Å in the ab plane and contain only 1.2 layers (not, vert, similar8.6 Å) on average. Since this biogenic Mn oxide consists mostly of isolated layers, basal 00l reflections are essentially absent despite its lamellar structure. Individual Mn layers are probably held together in the Mn–Zn precipitates by stabilizing organic molecules. Zinc biomineralization by plants likely is a defense mechanism against toxicity induced by excess concentrations of this metal in the rhizosphere

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Crystal Structure of Birnessite From the Pacific Ocean

Cited by 44 publications

References 4 publications

Structure of synthetic Na-birnessite: Evidence for a triclinic one-layer unit cell

Structure of synthetic Na-birnessite: Evidence for a triclinic one-layer unit cell

Characterization of Plutonium, Neptunium, Strontium on Manganese Solids from Permanganate Reduction

Formation of Zn–Ca phyllomanganate nanoparticles in grass roots

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