Abstract
¢-eucryptite (Li2O·Al2O3·2SiO2) was prepared by mechanochemical activation followed by calcination of the powder mixture containing pyrophyllite, gibbsite and lithium carbonate. XRD and FT-IR results showed that the crystallization of ¢-eucryptite occurred from the milled mixture by calcination. Dry milling using a planetary mill promoted the amorphization of the mixture. The crystallization of ¢-eucryptite increased with increment of milling time and calcination temperature. Trace amount of undesired phases such as cristobalite and quartz disappeared completely at 950°C in the mixture milled for 120min. The thermal expansion behavior characteristics were found to be strongly influenced by the milling time of the constituent powder mixture and calcination temperature. [doi:10.2320/matertrans.M2012332]
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