Titania-silica glasses of 3.1 to 8.5 wt% titania were prepared by sintering alkoxide synthesized colloidal powders. The process capitalizes on the advantages of sol-gel chemistry for powder synthesis while circumventing the problem of drying gels. Green bodies formed by colloidal gelation, uniaxial dry pressing and tape casting were sintered from 1200 to 1500°C to yield crystallite-free glasses. Complete solution of up to 8.5 wt% titania was inferred from TEM and FTIR analysis. Thermal expansion coefficients ranged from 2.6 × 10-7 to -0.38 × 10-7/°C between 25 and 700°C for glasses containing 3.1 to 8.5% TiO2, respectively.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry