Abstract
AbstractA glass melt with the composition of Ba2TiSi2O8·0.75 SiO2 was soaked at 1300°C. This did not lead to any crystallization. A current of 50 mA applied between the platinum crucible which acted as the anode and a platinum cylinder inserted to the melt as the cathode led to a potential of 1.2 V. This resulted in a crystallization of fresnoite at the cathode which continues for around 10 min until the crystallites reached the anode. The resulting glass ceramic was highly oriented and the microstructure was composed by fairly long needles consisting of fresnoite crystals. The long axis of the needles is the crystallographic c‐axis of the fresnoite. It is a polar axis and oriented parallel to the electric field. The nucleation process caused by current flow supposedly is an effect of the Ti3+ formed. Here, the viscosity should be decreased in the vicinity of the cathode and therefore the nucleation is enabled.
Published Version
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