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Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Subsequent crystal growth leads to dendritic fresnoite structures which become increasingly finer until the mechanism changes to viscous fingering during further cooling.
In the final stages of this initial growth step, the crystal orientations of these dendrites systematically change. The results are interpreted to confirm the link between viscous fingering and dendritic growth in the case of a true crystallization process.
Recent work applying electron backscatter diffraction EBSD towards the surface crystallization of glass has provided surprising new results 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8. It was observed that the topmost crystals of some systems already show discrete orientation preferences in the information volume of EBSD. As none of the textures detected so far prevailed during growth into the bulk 1 , 2 , 3 , 4 , 5 it is justified to conclude that oriented nucleation occurs in some glasses in contrast to the traditional assumption of statistically oriented nucleation.
The latter also occurs, e. The additional SiO 2 in the glass melt is added to allow comparability to the surface crystallization experiments of barium titanium silicate BTS 1 and STS 5 and experiments concerning the electrochemically induced nucleation of fresnoite in glasses 15 , 16 , 17 , 18 , It was initially chosen to ease glass preparation and controlled crystallization as the nucleation tendency of the glass is reduced by the added SiO 2.
BTS has one of the highest nucleation rates known for glass-ceramics 20 which makes it very difficult to produce a stoichiometric glass. It was shown that adding SiO 2 to the stoichiometric BTS glass composition increases the viscosity at the respective temperature The system discussed in this article has raised questions towards the mechanism of STS-growth in glasses.