Atomic Concentration Wave in Pt–Ti and Pd–Ti Alloys

Abstract

The atomic short range order of Pd–Ti and Pt–Ti alloys with a Ti concentration of about 10 at.% was studied by neutron diffraction. Temperature-independent diffuse satellite peaks were observed at incommensurate positions on the [100] axis. Due to the various properties of the diffuse satellite peaks, a concentration wave of constituent atoms appeared as a reflection of the special shape of the Fermi surfaces of the alloys. Its relationship to the Pt₈Ti superlattice structure is discussed.