Abstract
Amorphous silica films deposited by combustion chemical vapour deposition (CCVD)were modified by lithium addition in the precursor solution. The modifiedfilms were characterized by x-ray diffraction and scanning and transmissionelectron microscopy. The addition of lithium promoted the crystallization ofLi2O–SiO2 compounds, mainlycrystalline phases like Li2SiO3, Li2Si2O5, quartz and cristobalite. Besides this, the morphology of the film was modified, leading tothe formation of acicular structures and nanowires. Selected area electron diffraction(SAED) and microprobe EDS analysis indicated that the nanowires are amorphous andprobably constituted of silica.
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