Abstract
Experimental results of studying ion exchange process in glass-ceramics are presented. For the first time, it is discovered that the process may result in the disappearance of the crystalline phase in the layers undergoing ion exchange diffusion. This new phenomenon has been called the effect of decrystallization. The effect has been observed in a ceramic material formed out of a photosensitive Ag-doped lithium-silica glass, which can be crystallized owing to the photo-induced formation of fine silver particles as the nuclei for the growth of Li 2O·SiO 2 crystals. Samples of the glass-ceramics were subjected to ion exchange in NaNO 3 salt melt at the temperature at which viscosity of the initial glass is equal to 10 8 Ns/m 2. On processing, pure vitreous layers under all the faces of the sample processed have been obtained, the depth of those layers depending on the processing time.
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