A laser-heated diamond anvil cell（LHDAC）combined with in-situ observation is a very powerful tool for exploring novel materials under high pressure. In this study, silicon, germanium, and tin reacted with nitrogen at pressures above approximately 60 GPa, and pyrite-type pernitrides（AN2, A＝Si, Ge, Sn）were synthesized. The zero-pressure bulk moduli of the synthesized pernitrides were found to be systematically higher in the order of SiN2, GeN2, and SnN2. The synthesis process and crystal chemistry of the newly synthesized materials are described.
