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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

On the crystallization of gel-derived albite (NaAlSi3O8): the most stable oxide glass

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Siqueira, Renato Luiz ; Peitl, Oscar ; Zanotto, Edgar Dutra
Total Authors: 3
Document type: Journal article
Source: Journal of Sol-Gel Science and Technology; v. 80, n. 3, p. 619-625, DEC 2016.
Web of Science Citations: 2

Some glass-forming oxides, such as unseeded B2O3 and albite (NaAlSi3O8), exhibit outstandingly high resistance to devitrification and have never been crystallized at ambient pressure. For instance, a classical study reported that an albite glass produced by melting was held at 1025 A degrees C (close to the maximum growth rate predicted by a theoretical model) for 5 years without crystallizing. In this study, we tested the crystallization behavior of gel-derived albite glasses synthesized through two distinct and original routes and compared them with a melt-quenched sample because sol-gel glasses normally crystallize much faster than isochemical melt-derived glasses. Not only the melt-derived glass but also one of the gel samples (which contained much more OH- than its melted counterpart) remained amorphous in a differential scanning calorimetry experiment and after 12 h of heat treatment at 1000 and 1030 A degrees C. The other gel-derived material contained residual carbon partially crystallized during the same thermal treatment at 1000 and 1030 A degrees C. Therefore, in the absence of a suitable nucleating agent, crystallization does not occur, even in gel-derived albite glass with a high OH- content. {[}GRAPHICS] . (AU)

FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC