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    Mossbauer spectroscopy and x-ray diffraction studies of ferromanganese nodules from central Indian ocean basin

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    Date
    2017
    Author
    Ganwani, G.
    Bhatia, B.
    Jaisankar, S.
    Pattan, J.N.
    Dixit, A.
    Tripathi, R.P.
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    Abstract
    We report room temperature 57Fe Mossbauer spectroscopic and powder X-ray diffraction studies carried out on Fe-Mn nodules collected from the Central Indian Ocean Basin, to understand the oxidation state of Iron. Mossbauer spectra of all the nodules exhibit the presence of sharp quadrupole doublet, practically with identical M�ssbauer parameters inspite of the difference in Fe-Mn nodules chemical compositions. In all the Fe-Mn nodules samples quadrapole splitting (QS) values are centered around 0.5 mms1 and Isomer shift (IS) values are centered around 0.3 mms1. These values are characteristic of iron present either in Fe3%20 in paramagnetic or super paramagnetic phases. XRD studies suggest that the iron oxide phase/phases in these nodules are microcrystalline in nature. Our study indicates the presence of iron in microcrystalline ferromagnetic state which progressively has been converted to cubic spinel phases when heated at higher temperature
    URI
    http://www.appliedgeochemistsindia.org.in/abstract.html
    http://drs.nio.org/drs/handle/2264/7895
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