Abstract
A glass with the composition Ba2TiSi2.75O9.5 was crystallized by electrochemically induced nucleation. A dc-voltage (4.8 V) was attached between a platinum crucible containing the melt and a platinum wire inserted into the melt. The platinum wire was the cathode. After 2 min, crystals were formed at the cathode, which grew toward the crucible. These crystals consisted of fresnoite Ba2TiSi2O8, were highly oriented, and showed dendritic growth. These structures were characterized in detail by using electron backscatter diffraction/orientation imaging microscopy. Only a few crystals deviate from the main orientation of the respective dendrite. They were located and quantified. Intermediate areas between dendrites were analyzed, and the true boundaries of areas with homogeneous orientation are presented. The orientation is not as pronounced in the first 600 μm next to the platinum wire.
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