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dc.contributor.authorSantos, Carlos Alberto dospt_BR
dc.contributor.authorZawislak, Luci Irenept_BR
dc.contributor.authorKinast, Eder Juliopt_BR
dc.contributor.authorAntonietti, Volmirpt_BR
dc.contributor.authorCunha, Joao Batista Marimon dapt_BR
dc.date.accessioned2013-07-11T02:21:51Zpt_BR
dc.date.issued2001pt_BR
dc.identifier.issn0103-9733pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/75775pt_BR
dc.description.abstractIn this paper we review the crystal chemistry and structure data from the literature and our results reported in the last decade for natural and synthetic samples of the tantalite-columbite series. Orderdisorder transitions and oxidation reactions on the ixiolite-columbite-wodginite system are reported for one Brazilian sample. It is shown that reports on these subjects are sometimes dubious and incomplete. In addition to the reaction atmosphere (air or vacuum), order-disorder and oxidation are strongly dependent on the physical state of the samples (powdered or crystal). Structure and chemical composition have been investigated in our laboratory using X-ray di raction (XRD), electron probe microanalysis (EPMA) and Mossbauer spectroscopy (MS).en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofBrazilian journal of physics. São Paulo. Vol. 31, no. 4 (Dec. 2001), p. 616-631pt_BR
dc.rightsOpen Accessen
dc.subjectFísicapt_BR
dc.titleCrystal chemistry and structure of the orthorhombic (Fe, Mn)(Ta, Nb)/sub 2/O/sub 6/ family of compoundspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000306080pt_BR
dc.type.originNacionalpt_BR


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