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  • 1990-1994  (9)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Low temperature CEMS determination of the morphology of rust layers on an iron plate corroded in KCl solution (1992)
    Springer
    Hyperfine interactions 69 (1992), S. 831-834 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract CEMS and X-ray diffraction of rust layers on an iron coupon corroded in a 0.02 M KCl solution show that there exists a magnetite layer below an outer lepidocrocite layer. The 10 K spectrum displays three ferric sextets in its lepidocrocite part with fields of 448, 422 and 387 kOe respectively. They are attributed to Fe3+ ions having zero, one and more Cl− ions as first nearest neighbours. The Cl− ions do not seem to be ordered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401955
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  • 2
    Electronic Resource
    Electronic Resource
    The structure of Ni(II)−Fe(III) hydroxy-chloride green rusts by Mössbauer spectroscopy and X-ray diffraction (1992)
    Springer
    Hyperfine interactions 69 (1992), S. 827-830 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The crystallographic structure of Ni(II)−Fe(III) hydroxy-chloride green rusts obtained by oxidation of a FexNi1−x(OH)2 precipitate is isomorphous with that of the ferrousferric green rust one and independent of the value of P=Fe/Ni. Mössbauer spectra exhibit two quadrupole doublets after further oxidation of the compounds which correspond to a formula (3-x)Ni(OH)2 · xFeOOH · Fe(OH)2Cl. The Fe3+ ions are found to occupy preferentially the sites close to the Cl− ions and the Ni2+ those far from them. However the ordering of the Fe3+ ions is not perfect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401954
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  • 3
    Electronic Resource
    Electronic Resource
    Mössbauer effect study and crystallographic structure of chlorinated green rust one compounds (1992)
    Springer
    Hyperfine interactions 69 (1992), S. 839-842 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer spectra of green rust one run at 78 and 4.4 K exhibit two ferrous and one ferric sites in the 2/1/1 intensity ratio. Chemical formula is set at 3Fe(OH)2, Fe(OH)2Cl, nH2O. By replacing Fe2+ with Ni2+ ions, the compound is stabilized and the structure is determined on a ABiBCiCai stacking sequence. Space group is P3121 with an hexagonal unit cell of parameters a=6.17 and c=23.5 A0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401957
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  • 4
    Electronic Resource
    Electronic Resource
    The role of Cl− ions in the oxidation of iron artifacts from chlorinated archeological environments (1992)
    Springer
    Hyperfine interactions 70 (1992), S. 997-1000 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer analysis of archeological iron artifacts allows to determine mainly the presence of the β ferric oxyhydroxide, akaganeite, in the rust products. This confirms the role of Cl− ions in the environment leading to difficult preservation in a museum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397496
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  • 5
    Electronic Resource
    Electronic Resource
    Superparamagnetic behaviour of goethite prepared in sulphated medium (1990)
    Springer
    Hyperfine interactions 57 (1990), S. 2037-2043 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The formation of goethite is simulated by stirring up in the presence of air a mixture of FeSO4, 7H2O and NaOH in the 1∶5 ratio at different initial concentrationC of ferrous ions. Mössbauer spectra of the oxidation end products display the sextet of goethite (αFeOOH) and a paramagnetic ferric doublet increasing whenC decreases; the crystal structure of goethite is also being modified. At a critical low concentration, the orthorhombic structure is no longer justified; inactive α′-FeOOH, which has a similar X-ray diffraction pattern as δ-FeOOH is obtained. All these compounds are crystallographically related.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405761
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  • 6
    Electronic Resource
    Electronic Resource
    The substitution of Fe2+ ions by Ni2+ ions in the green rust 2 compound studied by Mössbauer effect (1990)
    Springer
    Hyperfine interactions 57 (1990), S. 2061-2066 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Green rust 2 is usually obtained by oxidizing an initial mixture of FeSO4 and NaOH solutions and a complete oxidation leads mainly towards γ oxyhydroxide known as lepidorocite. By adding some NiSO4 one can stop at the first stage and Mössbauer spectra reveral only ferric doublets. This implies that the initial formula 4Fe(OH)2, 2FeOOH, FeSO4 of green rust 2 must be replaced byxNi(OH)2, (6−x)FeOOH, NiSO4, wherex scans from 2 to 4. It also means that all initial ferrous ions become oxidized into the ferric state leaving the Ni2+ ions unchanged. Therefore the end product of oxidation is the nickel containing green rust 2 at the place of the usual lepidocrocite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405764
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  • 7
    Electronic Resource
    Electronic Resource
    The substitution of Fe2+ ions by Ni2+ ions in green rust one compounds (1994)
    Springer
    Hyperfine interactions 90 (1994), S. 389-394 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The oxidation of Fe(OH)2 in the presence of Cl− or CO 3 2− ions leads, in the first stage of the reaction, to chloride-containing green rust one (GR1), 3Fe(OH)2· Fe(OH)2Cl·nH2O, or carbonate-containing GR1, 4Fe(OH)2·Fe2(OH)4CO3·nH2O, respectively. These GR1 compounds give the ferric oxyhydroxides by further oxidation. If a hydroxide Ni x Fe1−x (OH)2 is initially precipitated, the reaction leads to a nickelous-ferric compound isomorphous to the ferrous-ferric GR1, but stable with respect to the oxidizing action of air. Similarly, the oxidation of a nickelous-ferrous hydroxide, in the presence of excess OH− ions, leads to a nickelous-ferric GR1, a layered hydroxide with anionic interlayers made of OH− ions and water molecules. The Mössbauer spectra of these nickelousferric GR1 display two ferric doublets, D0 withIS=0.34 mm/s andQS=0.45 mm/s and D1 withIS=0.36 mm/s andQS=0.86 mm/s. The existence of a ferrous-ferric GR1 incorporating OH− ions, a compound never observed so far, is strongly suspected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069144
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  • 8
    Electronic Resource
    Electronic Resource
    The oxidation of Fe(OH)2 in the presence of carbonate ions: Structure of carbonate green rust one (1994)
    Springer
    Hyperfine interactions 90 (1994), S. 395-400 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Sodium carbonate Na2CO3 is added to a solution containing an Fe(OH)2 precipitate in order to study the influence of CO 3 2− ions on the oxidation of ferrous hydroxide. The first stage of the reaction leads to a ferrous-ferric compound, the carbonate green rust one (GR1), identified by its X-ray diffraction pattern. The Mössbauer spectrum at 78 K of this GR1 displays two ferrous doublets and one ferric doublet in the 3∶1∶2 abundance ratio. The quadrupole splittingsQS are 2.91, 2.58 and 0.42 mm/s, respectively, and the isomer shifts 75 are 1.25, 1.25 and 0.47 mm/s respectively. These values are very close to those of the three doublets of the chloride GR1, 3Fe(OH)2Cl·Fe(OH)2Cl·nH2O. This fact confirms that the crystallographic structures of these two GR1s are similar, formed by the stacking of hydroxide layers and interlayers containing the considered anions (Cl− or CO 3 2− ) and water molecules. The chemical formula of carbonate GR1 is Fe 4 (II) Fe 2 (III) (OH)12CO3·nH2O, and its standard chemical potential -853 900 cal/mol ifn=0. The second stage of the reaction is the oxidation of GR1, which leads to α-FeOOH goethite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069145
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  • 9
    Electronic Resource
    Electronic Resource
    Mechanism of formation of delta FeOOH in a basic aqueous medium (1994)
    Springer
    Hyperfine interactions 93 (1994), S. 1783-1788 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mechanism of oxidation of ferrous hydroxide precipitated by mixing FeSO4 · 7H2O and NaOH solutions depends on the ratioR=[FeSO4]/[NaOH]. The study presented here concerns values ofR ranging from 0.38 to 0.43, i.e. Fe(OH)2 is precipitated in the presence of an excess of caustic soda. The analysis made by Mössbauer spectroscopy of the final compounds of oxidation shows that the valueR=5/12 is particular. At this value, 8FeOOH is the main product of oxidation. Its formation is assumed to take place through an intermediate compound, which formula is deduced from the value R=5/12 to be: 3Fe(OH)2 · 2Fe(OH)3 ·nH2O. This compound could be considered as a green rust one compound including excess OH− ions in theAcB i BaC j CbA k stacking, whereA, B andC are the OH− planes,a, b andc the iron planes, andi, j andk layers made of the excess OH− ions and water molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02072946
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