Óxidos de ferro magnéticos de um tufito da região do Alto Paranaíba, MG
Data(s) |
01/02/2005
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Resumo |
The Mössbauer analysis along with the structural Rietveld refinement based on powder X-ray data for the magnetic fraction (saturation magnetization, sigma = 19 J T-1 kg-1) separated from a tuffite material from Alto Paranaíba, state of Minas Gerais, Brazil, reveal that a (Ti, Mg)-rich maghemite (deduced sigma = 17 J T-1 kg-1) and, for the first time observed in this lithodomain, magnesioferrite (characteristic sigma = 21 J T-1 kg-1) respond for the magnetization of the rock material. Consistent models for the ionic distribution in these iron-rich spinel structures are proposed. |
Formato |
text/html |
Identificador |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000100002 |
Idioma(s) |
pt |
Publicador |
Sociedade Brasileira de Química |
Fonte |
Química Nova v.28 n.1 2005 |
Palavras-Chave | #magnesioferrite #Rietveld #Mössbauer |
Tipo |
journal article |