Óxidos de ferro magnéticos de um tufito da região do Alto Paranaíba, MG

Química Nova

Fernando Dias Da Silva²  Paulo Rogério Da Costa Couceiro²  José Domingos Fabris²  Antonio Taranto Goulart¹  João Carlos Ker¹ 

[1] ,Universidade Federal de Minas Gerais Instituto de Ciências Exatas Departamento de QuímicaBelo Horizonte MG

关键词: magnesioferrite;    Rietveld;    Mössbauer;   

DOI  :  10.1590/S0100-40422005000100002

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY-NC   
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