Abstract
The pressure induced phase transition, volume collapse and elastic properties have been investigated by means of two different models (1) modified interaction potential model (MIPM) which includes the three body interaction, covalency effect, overlap repulsive interaction up to second neighbour ions and van der Waal interaction. (2) Interaction potential model (IPM) which exclude the covalency effect in previous (IPM) model. The BN and GaN transform from B3 to B1 structure under high pressure (pt= 555 GPa and 37GPa) and show the volume collapse of 3.6% and 16.53%. The elastic constants have also been obtained. The results are in good agreement with the experimental and theoretical data where available.
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