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Nanocrystallisation of the cubic and hexagonal polymorphs of KLaF4 in a 70SiO2–7Al2O3–16K2O–7LaF3 (mol%) glass has been achieved by heat treatment above the glass transition temperature. For treatment at 580 °C, only the cubic structure crystallises, with a maximum crystallite size of ~9 nm. At higher temperatures, crystallisation of the hexagonal structure also takes place. The crystallisation process has been analysed using several thermal and structural techniques and is revealed to occur from a constant number of nuclei.

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Instituto de Cerámica y Vidrio - CSIC.  C/Kelsen 5. Campus de Cantoblanco. 28049 Madrid. webmaster@icv.csic.es