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5. High-pressure surface science
Book chapter   Peer reviewed

5. High-pressure surface science

Vladislav Domnich and Yury Gogotsi
Experimental Methods in the Physical Sciences, pp 355-445
2001
DOI: https://doi.org/10.1016/S1079-4042(01)80052-7

Abstract

Interaction between two material surfaces in a real environment is a complex process that may involve material fracture, deformation, mechanochemical interactions, and phase transformations. These processes must be considered together because of the existing synergy between them. Both static and dynamic interactions between two hard surfaces may result in phase transformations. Hydrostatic and deviatoric stresses must be taken into account and phase transformations in contact loading can be described as deformation-induced transformations. At the same time, the transformation pressures for silicon obtained in indentation tests are in good agreement with the results from high-pressure cell experiments, which utilize hydrostatic loading. Phase transformations in semiconductors, including pressure-induced metallization, are described in this chapter. Currently, only silicon has been studied thoroughly enough. However, even for this simple elemental semiconductor, not all issues concerning identification of new phases, transformations mechanisms, and transformation paths have been resolved. Raman microspectroscopy is the fastest and most powerful tool for the analysis of phase transformations in contact loading. It can additionally provide information on residual stresses and/or chemical changes in the surface layers.

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