Abstract
Rhenium nitride (ReN2) crystals were synthesized from a metathesis reaction between ReCl5 and Li3N under high pressure. The reaction was well controlled by the addition of a large amount of NaCl as reaction inhibitor to prevent a violent exothermic reaction. The largest rhenium nitride crystals obtained had a millimeter-order size with a platelet shape. X-ray diffraction analysis revealed that rhenium nitride has MoS2 structure similar to hexagonal rhenium diboride (ReB2) which has recently been investigated as an ultra-hard material. The structure was different from any structures previously predicted for ReN2 by theoretical calculations.
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