Abstract
Abstract Phases formed at high temperatures from ground pyrophyllite in porcelain and agate mortars have been studied by X-ray diffraction. Cordierite (2MgO.2Al 2 O 3 .5SiO 2 ) as one crystalline phase appears in ground samples in a hard porcelain mortar after being treated above 1300°C, due to the reaction of enstatite (MgO.SiO 2 ), derived from the balls used, with mullite (mainly 3Al 2 O 3 .2SiO 2 ) and cristobalite (SiO 2 ) originating from the decomposed pyrophyllite sample during heating. After milling experiments using agate mortar and balls, the formation of cristobalite at lower temperatures, in ground as opposed to unground materials in hard porcelain, is attributed to contamination resulting from the mill and balls used.
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