LETTER TO THE EDITOR: Novel behaviour and structure of new glasses of the type Ba Al O and Ba Al Ti O produced by aerodynamic levitation and laser heating
Abstract
Novel barium aluminate (BaAl2O4) and barium alumino-titanate (BaAl2TiO6) glasses have been produced by aerodynamic levitation and laser heating. BaAl2O4 forms a clear and colourless glass under containerless and rapid quenching conditions. Under similar rapid quenching conditions BaAl2TiO6 forms an opaque and black glass, while under slower and controlled quenching conditions it is possible to form a clear and colourless glass. The formation of the opaque or clear glass is reversible and purely dependent on the quench rate used. By slowing the quench rate further, it is possible to produce a milky glass suggestive of liquid-liquid phase separation in the liquid before glassification. High-energy x-ray diffraction experiments confirm the glassy state of these materials and show coordination structures and bond distances similar to their crystalline analogues.
- Publication:
-
Journal of Physics Condensed Matter
- Pub Date:
- August 2006
- DOI:
- 10.1088/0953-8984/18/32/L01
- Bibcode:
- 2006JPCM...18L.407S