Química Nova | |
Óxidos de ferro magnéticos de um tufito da região do Alto Paranaíba, MG | |
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
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
【 预 览 】
Files | Size | Format | View |
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RO202005130061503ZK.pdf | 791KB | download |