Seminarium Fizyki Ciała Stałego

A review of the investigations of the pressure – temperature phase diagram is given. The early investigation were limited to low temperatures and low pressures which provided only basic understanding of the problem. More recent investigation combined very high pressure experiments and also classical molecular dynamic simulation which provided new insight into the problem of decomposition and congruent melting of GaN. Later research included ab initio data on high pressure wurtzite – rocksalt phase transition. Recent ab initio molecular dynamic provide more deep insight into the problem by separation of the GaN decomposition into Ga(l)+ N_2 mixture and GaN melting into Ga(l)+N solution. The obtained simulation results are in good agreement with the available experimental data.