Deposition Properties of SiO₂-GeO₂Particles in the Flame Hydrolysis Reaction for Optical Fiber Fabrication

Abstract

Deposition properties of SiO2-GeO2 particles synthesized by the flame hydrolysis reaction of SiCl4-GaCl4 (10 mol%) were investigated with emphasis on the effect of the substrate temperature Ts. Deposited GeO2 was found to be formed with hexagonal crystalline structure for Ts<400°C, but with noncrystalline form dissolved into SiO2 glass networks for Ts>500°C ; the dissolved GeO2 concentration increased with increasing Ts from 500°C to 800°C. This is of practical interest in relation to the soot processes for optical fiber fabrication.