Synthesis and sintering at low temperature of a new nanostructured beta-Eucryptite dense compact by spark plasma sintering
- Suárez, Marta
- Fernández, Adolfo
- Díaz, Luis A.
- Sobrados, Isabel
- Sanz Lázaro, Jesús
- Borrell, Amparo
- Palomares, F. Javier
- Torrecillas, Ramón
- Moya, J. S.
DOIAbstract
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 materia...
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