Revealing the atomic mechanism of diamond-iron interfacial reaction

Abstract

Diamond, with ultrahigh hardness, high wear resistance, high thermal conductivity, and so forth, has attracted worldwide attention. However, researchers found emergent reactions at the interfaces between diamond and ferrous materials, which significantly affects the performance of diamond-based devices. Herein, combing experiments and theoretical calculations, taking diamond–iron (Fe) interface as a prototype, the counter-diffusion mechanism of Fe/carbon atoms has been established. Surprisingly, it is identified that Fe and diamond first form a coherent interface, and then Fe atoms diffuse into diamond and prefer the carbon vacancies sites. Meanwhile, the relaxed carbon atoms diffuse into the Fe lattice, forming Fe₃C. Moreover, graphite is observed at the Fe₃C surface when Fe₃C is over-saturated by carbon atoms. The present findings are expected to offer new insights into the atomic mechanism for diamond-ferrous material's interfacial reactions, benefiting diamond-based device applications.

Keywords

coherent interface / counter-diffusion / diamond / iron / phase transition

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2023 The Authors. Carbon Energy published by Wenzhou University and John Wiley & Sons Australia, Ltd.