Cerium silicates formation from mechanically activated oxide mixtures
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Reactions of cerium silicate formation in mechanically activated oxide powders of CeO2 and SiO2 (quarz) were studied. Three different mixtures were prepared, the compositions of which corresponded to Ce2Si2O7, Ce-4.67(SiO4)(3)O and Ce2SiO5. Oxide mixtures were mechanically activated in vibratory mill up to 120 min. X-ray analysis performed on activated mixtures showed that the CeO2 crystallite size decreased with increasing activation time. However, CeO2 lattice distortions passed through a maximum after 30 min of activation. The results obtained after heating showed that reactions proceeded via formation of intermediate compounds. Evidence of the existence of a liquid phase at 1550degreesC is given. (C) 2004 Kluwer Academic Publishers.
Извор:Journal of Materials Science, 2004, 39, 16-17, 5283-5286
Напомена:4th International Conference on Mechanochemistry and Mechanical Alloying, Sep 07-11, 2003, Braunschweig, Germany
ISSN: 0022-2461 (print)