Structure property relationship in (TiZrNbCu)_(1-x)Ni_x metallic glasses

摘要

The atomic structure, electronic structure, and physical properties of (TiZrNbCu)(1-x)Ni-x (x = 0.5) metallic glasses (MGs) were studied in both the high-entropy (0 x 0.35) and the higher Ni concentration range (x = 0.35). Atomic structure studies performed with X-ray diffraction and synchrotron powder diffraction provided average atomic volumes, structure factors, radial distribution functions, coordination numbers, and packing densities. Electronic structure studies performed using photoemission spectroscopy and low-temperature specific heat provided information about the electronic density of states within the valence band and at the Fermi level and also about interatomic bonding and atomic vibrations [from the Debye temperature and the boson peak (BP)]. Variations of both atomic structure and electronic structure with x showed a clear change for x = 0.35, which corresponds to a valence electron number = 7.4. All physical properties, namely, thermal stability parameters, Debye temperatures, BPs, magnetic, elastic, and electronic transport properties, change their concentration-dependence for x = 0.35. The results are compared with those for binary and ternary MGs of the same elements.