High-pressure phase transitions and equations of state in NiSi. III. A new high-pressure phase of NiSi

A new orthorhombic high-pressure phase of NiSi has been synthesized in a multi-anvil press at 1223–1310 K and 17.5 GPa. Its crystal structure has been determined and found to be closely related to that of a tetragonal form of NiSi predicted previously to be stable at high pressure by ab initio computer simulations.