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  • 1990-1994  (9)
  • 1985-1989  (6)
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Year
  • 11
    Electronic Resource
    Electronic Resource
    Mechanism of formation of magnetite from ferrous hydroxide in aqueous corrosion processes (1989)
    Springer
    Hyperfine interactions 46 (1989), S. 429-436 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The stoichiometric conditions for the formation of ferrous hydroxide Fe(OH)2, by mixing Fe2+ ions with caustic soda NaOH, leads by oxidation to magnetite, irrelevant of the foreign anions, e.g. Cl− or SO4 2−, as demonstrated from Mössbauer spectroscopy. The electrochemical potential Eh and pH value of the initial conditions correspond to the drastic change from basic to acidic medium, observed when varying the initial Fe2+/OH− ratio. Mössbauer analysis of the end products of oxidation at various temperatures shows that magnetite is only obtained at stoichiometry at very low temperature, but extends off stoichiometry at higher temperatures. The mechanism of formation of magnetite through an intermediate compound is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398227
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    Kinetics of formation of green rust 2 in the steady acidic sulphated medium (1990)
    Springer
    Hyperfine interactions 57 (1990), S. 2029-2035 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The kinetics of formation of green rust 2, 4Fe(OH)2.2FeOOH.FeSO4.nH2O, called “GR2, was followed by Mössbauer spectroscopy in the controlled aeration of a mixture of 0.4 M FeSO4 and 0.4 M NaOH. Mössbauer spectra run at 78 K of the reaction products taken at different time intervals display an average of seven doublets. The initial products of reaction consists of a badly crystallized ferrous hydroxide, FE(OH)2., called “FH”, which disappears first at about 1/3 of the total time of formation of GR2, and sulphated ferrous hydroxide, 4Fe(OH)2.FeSO4.nH2O, called “SFH”. The kinetics of oxidation of SFH into GR2 can be described by a linear growth reaction and the transformation is considered to be in situ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405760
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    Paper (German National Licenses)
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  • 13
    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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    Paper (German National Licenses)
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  • 14
    Electronic Resource
    Electronic Resource
    Mössbauer kinetics of formation of goethite in the basic medium: Effect of the particle size of ferrous hydroxide (1992)
    Springer
    Hyperfine interactions 69 (1992), S. 823-826 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The formation of goethite in the basic medium is simulated by stirring, in the presence of air, a mixture of FeSO4.7H2O and NaOH in the 1∶5 ratio at different initial concentration C of ferrous ions. The initial oxidation product is ferrous hydroxide and its further oxidation leads mainly to goethite through active α′-FeOOH. The kinetics of the process is studied from Mössbauer spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401953
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    Paper (German National Licenses)
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  • 15
    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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    Paper (German National Licenses)
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