Abstract

Nanocrystalline chromium nitride (CrN) with the cubic rock-salt structure was synthesized by the arc discharge method in nitrogen gas (N 2). The product was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that the nitrogen gas pressure is a crucial factor for the synthesis of cubic CrN. At relatively low N 2 pressure, cubic CrN was formed. With the increase of N 2 pressure, hexagonal Cr 2N and metal Cr were gradually formed. It indicated that the formation of CrN apparently favors a low nitrogen pressure environment, and the diffusion of nitrogen atoms into the Cr was lowered with the increase of N 2 pressure. We explain this experimental observation in terms of the evaporation rate of anode Cr and the ionization of nitrogen.

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