Abstract
Mullite crystals were grown from a MgO/Al2O3/TiO2/SiO2/B2O3/CaO glass melt via the method of electrochemically induced nucleation. Nucleation occurs near the cathode; the initially formed crystals are not oriented with their polar axes parallel to the electric field. The crystals showed needle-like shape. The crystal growth velocity shows a maximum at about 1260 °C and does not depend on time. The orientation distribution of the crystals in the resulting glass-ceramics was analyzed using electron backscatter diffraction (EBSD). During crystal growth, diffusion zones around the crystals are formed as shown by energy dispersive X-ray spectroscopy (EDX). These diffusion zones act as barriers which control the morphology of the formed mullite crystals.
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