Extended and local structural description of a kaolinitic clay, its fired ceramics and intermediates: an XRD and XANES analysis
| Autor: | Nicolás M. Rendtorff, Gustavo Suárez, M.R. Gauna, Esteban F. Aglietti, Félix G. Requejo, María Susana Conconi, Leandro Rubén Andrini |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Recubrimientos y Películas
020101 civil engineering AL K-XANES 02 engineering and technology INGENIERÍAS Y TECNOLOGÍAS KAOLINITIC CLAY X-RAY ABSORPTION X-ray absorption 0201 civil engineering Ciencias de la Tierra y relacionadas con el Medio Ambiente Firing transformations Geochemistry and Petrology Ingeniería de los Materiales FIRING TRANSFORMATIONS Chemistry Otras Ciencias Químicas Metallurgy Ciencias Químicas Geology Química 021001 nanoscience & nanotechnology XANES Kaolinitic clay 0210 nano-technology Meteorología y Ciencias Atmosféricas Al K-XANES CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| Popis: | The thermal transformations processes of kaolinite (K) in kaolinitic clays is knownto consist of a dehydroxylation into metakaolin (MK) at ≈600 °C, followed by the formation of a spinel type aluminosilicate (SAS) at≈980 °C, and finally the development of mullite (M) at higher temperatures (1200–1300 °C). The structural characterization of thesematerials is generally based on X-ray diffraction (XRD) studies,where the XRD features of K and M are well defined due to their crystalline nature, but as consequence of the low crystallinity of MK and SAS, the precise characterization of these phases is not possible using this technique. In this study the nature of aluminum atoms in the different materials obtained by thermal treatments of a kaolinite is investigated using Al K-XANES and compared with other well-known aluminum containing materials. XRD and SEM characterization were also carried out. The results confirm the potentiality of this synchrotron based techniques for the characterization of natural materials and ceramics especially with low crystallinity. Particularly the mullite aluminums Al K-XANES spectra were not reported before. Centro de Tecnología de Recursos Minerales y Cerámica Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Facultad de Ciencias Exactas |
| Databáze: | OpenAIRE |
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