Electronic theory for phase stability of nineABbinary alloys, withA=Ni, Pd, or Pt andB=Cu, Ag, or Au

By performing the local-density-functional band calculations, we analyzed the phase stability of nine binary-alloy systems which are composed of Ni, Pd, or Pt as one element and Cu, Ag, or Au as the other. Most of the qualitative aspects of the phase diagrams of these systems are reproduced successfully. It is pointed out that the relativistic effect plays a crucial role in the phase stability of Pt-based alloys. A possibility is also suggested that AgPd with the L1₁ structure may be realized at low temperatures.