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Crystallographic, Mössbauer and electrokinetic study of synthetic lipscombite

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Abstract

The transformation of vivianite and the direct synthesis starting from pure chemicals lead to the formation of lipscombite {Fe 2+x Fe 3+3−x [(OH)3−x/(PO4)2]} with varying Fe2+/Fe3+ molar ratios. The influence of this ratio on the Mössbauer spectra, solubility, electrokinetic potential and infrared spectra has been studied. By means of Mössbauer spectroscopy, the distribution of the Fe2+ and Fe3+ ions between the octahedral sites I and II has been investigated.

The unit cell dimensions have been determined from Guinier-Hägg X-ray diffraction patterns. The crystal system is tetragonal for synthetic lipscombite with a=5.3020±0.0005 Å and c=12.8800±0.0005 Å.

Lipscombite has been found to show a negative and time-dependent zeta-potential which, moreover, is influenced by the pH of the suspension and the Fe2+/Fe3+ molar ratio. An explanation of the time-dependence of the zeta-potential on variations of solubility is proposed.

Infrared absorption spectrum only is characterized by two absorption bands: v OH(3,500 cm−1) and v P−O(1,100-960 cm−1). The density at 25° C is determined in toluene as 3.36±0.01 g·cm−3.

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Authors and Affiliations

  1. Laboratory for Chemical and Physical Mineralogy, University of Antwerpen, Middelheimlaan 1, 2020, Antwerpen, Belgium

    R. Vochten

  2. Laboratory for Magnetism, State University of Gent, Proeftuinstraat 86, 9000, Gent, Belgium

    E. De Grave

Authors
  1. R. Vochten
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  2. E. De Grave
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Vochten, R., De Grave, E. Crystallographic, Mössbauer and electrokinetic study of synthetic lipscombite. Phys Chem Minerals 7, 197–203 (1981). https://doi.org/10.1007/BF00311889

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  • DOI: https://doi.org/10.1007/BF00311889

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