Abstract
A sol-gel process was used to produce glasses of the composition (wt.%) 66% SiO 2-18%B 2O 3-7%Al 2O 3-3%BaO-6%Na 2O. Monolithic samples of this composition were made by gelling concentrated solutions (12% equivalent oxides). Thin films were prepared by dipping soda-lime glass substrates into dilute solutions (2%) equivalent oxides). The densification of both the monolithic gels and the thin films was investigated by thermal gravimetric analysis combined with dilatometry (monoliths) and ellipsometry (films). The pore structures and refractive indices of both films and monoliths were also investigated as functions of the gel-to-glass conversion temperature. Although for the same heat treatment most film properties showed trends similar to those for monolithic samples, film properties generally exhibited values which corresponded to a more compact structure, i.e. higher density, lower surface area and higher refractive index.
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