Peculiarities of laser-induced material transformation inside diamond bulkстатья
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Дата последнего поиска статьи во внешних источниках: 5 сентября 2016 г.
Аннотация:Structure of a material modified by short laser pulses inside a diamond sample at different distances from the sample surface was investigated with Raman spectroscopy. It is shown that transformation of diamond into nanocrystalline graphite reported earlier takes place only within a thin surface layer. Beyond the layer, just part of sp(3) sites is converted into sp(2) sites at the same irradiation conditions. The residual sp(3) phase forms nanometer-scale crystals, while the generated sp(2) phase is rather amorphous. Suppression of the graphitization process far away from the sample surface seems to be a result of permanent compression of the modified region by the surrounding diamond matrix due to change of the material density under the phase transition. The observed total graphitization of diamond near the sample surface can be explained by efficient relaxation of the compressive stress due to mainly inelastic mechanisms. (C) 2013 Elsevier B.V. All rights reserved.