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dc.contributor.authorGanwani, G.
dc.contributor.authorBhatia, B.
dc.contributor.authorJaisankar, S.
dc.contributor.authorPattan, J.N.
dc.contributor.authorDixit, A.
dc.contributor.authorTripathi, R.P.
dc.date.accessioned18/2/2019
dc.date.accessioned2019-02-18T20:16:33Z
dc.date.available9/8/2017
dc.date.available2019-02-18T20:16:33Z
dc.date.issued2017
dc.identifier.citationJournal of Applied Geochemistry, vol.19(3); 2017; 270-276
dc.identifier.issn0972-1967
dc.identifier.urihttp://www.appliedgeochemistsindia.org.in/abstract.html
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/7895
dc.description.abstractWe 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
dc.languageen
dc.publisherIndian Society of Applied Geochemists
dc.relation.isreferencedbyNON-SCI
dc.titleMossbauer spectroscopy and x-ray diffraction studies of ferromanganese nodules from central Indian ocean basin
dc.typeJournal Article
dc.affiliation.authorInstitute for Geology, CEN, University of Hamburg, Bundesstrasse 55, 20146�Hamburg, Germany


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