Combined Roles of Ion Bombardment and Electron Emission in Bias-Enhanced Diamond Nucleation on Silicon by Hot Filament Chemical Vapour Deposition
Abstract
Fresh silica gels prepared by the sol-gel route with acid catalysis display typical alterations of the X-ray diffraction (XRD) pattern, in comparison with vitreous (v) silica. A positive shift of the first peak at k1 is noticed, which also shows excess broadening. The changes can be accounted for by the alteration of the intermediate-range order (IRO) in gels, in comparison with v-SiO2. Thermal annealing causes a gradual decrease in the shift and broadening of the first peak, suggesting that the evolution of the vitrification can be followed on the basis of XRD data. Two types of IRO alteration were modelled, which account quantitatively for the experimental observations using a phenomenological disorder parameter b. The evolution of the b values with annealing temperature reveals well-defined stages in the vitrification process.
- Publication:
-
Physica Status Solidi Applied Research
- Pub Date:
- June 1997
- DOI:
- 10.1002/1521-396X(199706)161:2<317::AID-PSSA317>3.3.CO;2-O
- Bibcode:
- 1997PSSAR.161..317M