Synthesis and sintering at low temperature of a new nanostructured beta-Eucryptite dense compact by spark plasma sintering
The solid state reaction between kaolin and Li2CO3 with a 1:1 M composition has been studied in the temperature range 380°C-550 °C. The role played by Li2CO3 (basic medium) in the thermal transformation of the kaolin has been investigated by X-Ray diffraction, FESEM, TEM, MAS-NMR and XPS techniques....
| Autores: | , , , , , , , , |
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| Formato: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2020 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/219262 |
| Acesso em linha: | http://hdl.handle.net/10261/219262 |
| Access Level: | acceso abierto |
| Palavra-chave: | Spark plasma sintering Geopolymer Kaolin β-Eucryptite |
| Resumo: | The solid state reaction between kaolin and Li2CO3 with a 1:1 M composition has been studied in the temperature range 380°C-550 °C. The role played by Li2CO3 (basic medium) in the thermal transformation of the kaolin has been investigated by X-Ray diffraction, FESEM, TEM, MAS-NMR and XPS techniques. For the first time, a nanostructured high density β- Eucryptite (<10 nm) has been obtained by Spark Plasma Sintering (SPS) at 550 °C in high vacuum. The atmosphere used in sintering treatments has a determinant role in lithium migration and crystallization of β- Eucryptite. In the case of low vacuum treatments, an amorphous LiAlSiO4 geopolymer type material was obtained. Due to exclusive properties and performances of β- Eucryptite based materials, the results reported in the present investigation open new perspectives for new nanostructured and amorphous functional materials with null thermal expansion, ionic conduction and remarkable mechanical properties. |
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