Abstract
On friction of a heterogeneous material: sandstone, flashes of triboluminescence are observed. Triboluminescence arises on the relaxation of excitation of free radicals ≡Si–O–. These radicals form on disruptions of Si–O–Si bonds and are located at microcrack edges. Microcracks form at the boundaries of feldspar and quartz microcrystals. Their sizes range from ~0.4 to ~7 μm. The microcrack formation on friction leads to the spalling of feldspar and quartz microcrystals from a sample.
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Original Russian Text © V.I. Vettegren’, A.V. Ponomarev, I.P. Shcherbakov, R.I. Mamalimov, 2017, published in Fizika Tverdogo Tela, 2017, Vol. 59, No. 8, pp. 1557–1560.
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Vettegren’, V.I., Ponomarev, A.V., Shcherbakov, I.P. et al. The influence of the structure of a nanocrystalline solid (sandstone) on the dynamics of microcrack accumulation on friction. Phys. Solid State 59, 1580–1583 (2017). https://doi.org/10.1134/S1063783417080315
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DOI: https://doi.org/10.1134/S1063783417080315