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- W2085559095 abstract "This paper examines the role of iron in mullite nucleation and growth from kaolins. We chose two typical raw kaolins containing a reduced impurity level and characterized by very different degrees of crystallinity of the kaolinite phase. Both the structural iron in kaolinite and also some iron deposited onto phyllosilicate layers by a chemical route were considered. After firing in the 900–1100°C temperature range, the Fe environment was determined by Mössbauer spectroscopy. From X-ray spectra of samples fired at 1250°C, mullite stoichiometries were obtained by Rietveld refinements. It was shown that iron contributes to the structural reorganization stage of the material, when mullite is nucleated. Fe atoms are essentially in octahedral sites, which favors an increase of the c parameter of the orthorhombic cell. The iron quantity attains a saturation level for an Fe-to-Al ratio between 0.3 and 0.4, depending on the raw kaolinite crystallinity. Besides mullite, the excess iron associates with titanium to form a pseudobrookite phase and hematite." @default.
- W2085559095 created "2016-06-24" @default.
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- W2085559095 date "2003-01-01" @default.
- W2085559095 modified "2023-10-07" @default.
- W2085559095 title "Role of Iron in Mullite Formation from Kaolins by Mössbauer Spectroscopy and Rietveld Refinement" @default.
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- W2085559095 doi "https://doi.org/10.1111/j.1151-2916.2003.tb03289.x" @default.
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