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Résumé:

We present a structural and optical investigation of nitrogen-doped single crystals of cubic silicon carbide prepared by the continuous feed - physical vapour transport method. Self-nucleated crystals were produced which exhibited well faceted square and triangular shapes. KOH etching was used to characterize the Structural defects. like stacking faults and dislocations. The effect of changing the nitrogen flow rate oil the different crystalline orientations was investigated by Raman spectroscopy and low temperature photoluminescence techniques.