Stability and electronic structure of Zr-based ternary metallic glasses and relevant compounds

摘要

The electronic structure of the Zr-based metallic glasses has been investigated by theoretical and experimental approaches. One approach is band calculations of the Zr_2Ni (Zr_(66.7)Ni_(33.3)) compound to investigate the electronic structure of the Zr_(66.7)Ni_(33.3) metallic glass (ΔT_x - 0 K) of which the local atomic structure is similar to that of the Zr_2Ni compound. The other is photoemission spectroscopy of the Zr_(50)Cu_(35) Al_(15) bulk metallic glass (BMG) (ΔT_x = 69 K). Here ΔT_x = T_x - T_g where T_x and T_g are crystallization and glass transition temperature, respectively. Both results and previous ones on the Zr_(55)Cu_(30)Ni_5Al_(10) BMG indicate that there is a pseudogap at the Fermi level in the electronic structure of these Zr-based metallic glasses, independent of the value of the ΔT_x. This implies that the pseudogap at the Fermi level is one of the factors that stabilize the glass phase of Zr-based metallic glasses.