Abstract
The current state of the theoretical and experimental studies of changes in the chemical structure and composition caused by segregation phenomena on the surface of chemical compounds was reviewed. The review considers the experimental data obtained exclusively on single crystals, which were studied by modern instrumental methods, including in situ Auger electron spectrometry, X-ray spectral microanalysis, high-resolution scanning and transmission electron microscopy, secondary electron emission, and atomic force microscopy. The models that suggest the crystal-chemical diffusion and liquid-phase mechanisms of segregation were described. The parameters of the theory include the type of chemical bond, elastic constants, and crystal-chemical characteristics of substances. The models make it possible to predict the nature of changes in the surface composition: segregation tendency, segregant type, and degree of nonstoichiometry. A new direction in surface segregation was considered, which is promising for nanoelectronics and emission electronics.
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Original Russian Text © Yu.Ya. Tomashpol’skii, 2018, published in Zhurnal Fizicheskoi Khimii, 2018, Vol. 92, No. 6, pp. 871–882.
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Tomashpol’skii, Y.Y. Segregation Phenomena on the Crystal Surface of Chemical Compounds. Russ. J. Phys. Chem. 92, 1060–1070 (2018). https://doi.org/10.1134/S0036024418060195
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DOI: https://doi.org/10.1134/S0036024418060195