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Synthesis and sintering at low temperature of a new nanostructured beta-Eucryptite dense compact by spark plasma sintering

AuthorsSuárez, Marta ; Fernández, Adolfo ; Díaz, Luis A. ; Sobrados, Isabel ; Sanz Lázaro, Jesús; Borrell, Amparo; Palomares, F. Javier ; Torrecillas, Ramón ; Moya, J. S.
KeywordsSpark plasma sintering
Issue Date2020
CitationCeramics International 46(11B): 18469-18477 (2020)
AbstractThe 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.
Publisher version (URL)https://doi.org/10.1016/j.ceramint.2020.04.152
Appears in Collections:(ICMM) Artículos
(CINN) Artículos
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