Abstract
The formation of a surface layer with silver and sodium concentration gradients in K8-grade glasses as a result of ion exchange is demonstrated by scanning electron microscopy (SEM) and electron probe X-ray microanalysis. The silver ions enriched layers with different thicknesses, depending on the duration of the ion exchange from the silver melt, are visualized in the secondary electrons mode. SEM data on the thickness of the silver enriched layer are in good agreement with the results of calculation from the diffusion equation for silver in glass. The dependence of the silver concentration on the diffusion depth is obtained using elemental composition map** over the glass cross section. The presence of a layer with a silver concentration gradient leads to formation of a gradient waveguide. Discrete peaks in silver concentration profiles, caused by specific features of mutual diffusion of sodium and silver ions in glasses, are found.
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ACKNOWLEDGMENTS
Electron microscopy analyses were performed using equipment of the Federal Shared Research Center, Materials Science and Diagnostics in Advanced Technologies and supported by the Ministry of Education and Science of the Russian Federation (unique project identifier RFMEFI62117X0018).
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Translated by A. Sin’kov
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Lihachev, A.I., Nashchekin, A.V., Sokolov, R.V. et al. Determination of the Thicknesses and Visualization of Ion-Exchange Waveguides in Glasses by Scanning Electron Microscopy. Tech. Phys. 64, 418–421 (2019). https://doi.org/10.1134/S1063784219030174
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DOI: https://doi.org/10.1134/S1063784219030174