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Mössbauer and magnetic studies of nanocomposites containing iron oxides and humic acids |
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| Authors: | N I Chistyakova A A Shapkin T V Gubaidulina M E Matsnev R R Sirazhdinov V S Rusakov |
| Institution: | 1. Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), 39100-000, Diamantina, Minas Gerais, Brazil 2. Centro para el Desarrollo de la Nanociencia y Nanotecnología (CEDENNA), Santiago, 725475, Chile 3. Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Santiago, 725475, Chile 4. Centro de Desenvolvimento da Tecnologia Nuclear, 31270-901, Belo Horizonte, Minas Gerais, Brazil 5. Instituto de Ciência, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39803-371, Teófilo Otoni, Minas Gerais, Brazil |
| Abstract: | A sample of volcanic ashes emanated from the Osorno volcano, southern Chile, was characterized with X-ray fluorescence, X-ray diffraction and 57Fe Mössbauer spectroscopy, in an attempt to identify the iron-bearing minerals of that geologically recent magmatic deposit. X-ray patterns indicated that the sample is mainly constituted of anorthite, Fe-diopside-type and Ca-magnetite. The crystallographic structures of these dominant iron minerals are proposed on basis of their chemical composition and corresponding Mössbauer data to support models refined by fitting powder X-ray diffraction data with the Rietveld algorithm. |
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