期刊论文详细信息
Química Nova
Magnetic iron oxides from a tuffite from Alto Paranaíba, state of Minas Gerais, Brazil
Centro Universitário de Patos de Minas, Patos de Minas1  Universidade Federal de Minas Gerais, Belo Horizonte1  Universidade Federal de Viçosa, Viçosa1  Couceiro, Paulo Rogério da Costa1  Goulart, Antonio Taranto1  Ker, João Carlos1  Silva, Fernando Dias da1  Fabris, José Domingos1 
关键词: magnesioferrite;    Rietveld;    ;    ssbauer.;   
DOI  :  10.1590/S0100-40422005000100002
学科分类:化学(综合)
来源: Sociedade Brasileira de Quimica
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【 摘 要 】

The Mössbauer analysis along with the structural Rietveld refinement based on powder X-ray data for the magnetic fraction (saturation magnetization, s = 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 s = 17 J T-1 kg-1) and, for the first time observed in this lithodomain, magnesioferrite (characteristic s = 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】

Unknown   

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