Synthesis of Co2N by a simple direct nitriding reaction between nitrogen and cobalt under 10Â GPa and 1800Â K using diamond anvil cell and YAG laser heating

Synthesis of cobalt nitrides has been tried in a supercritical nitrogen fluid at high pressure (about 10 GPa) and high temperature (about 1800 K) using diamond anvil cell and YAG laser heating system. We have succeeded to synthesize a single phase of the CFe2-type Co2N easily in a short time. This is the first synthesis by a simple reaction between the pure cobalt and pure nitrogen (supercritical fluid nitrogen). The cell parameters of the synthesized Co2N are a=4.662(9) Å, b=4.332(5) Å and c=2.749(9) Å, respectively.