Electronic structure of $T_5{T}_9$ metallic glasses ($T_5=\mathrm{Nb},\mathrm{Ta}$; $T_9=\mathrm{Rh},\mathrm{Ir}$) studied by photoelectron spectroscopy

Photoelectron spectroscopy of glassy ${\mathrm{Nb}}_{55}$ ${\mathrm{Rh}}_{45}$, ${\mathrm{Nb}}_{55}$ ${\mathrm{Ir}}_{45}$, ${\mathrm{Ta}}_{55}$ ${\mathrm{Rh}}_{45}$, and ${\mathrm{Ta}}_{55}$ ${\mathrm{Ir}}_{45}$ alloys reveal a common $d$ band of the two alloy constituents with a large shift of the $T_9$ metal $d$ states to higher, and a shift of the $T_5$ metal $d$ states to lower binding energies relative to the corresponding pure metal. The charge transferred from the $T_5$ to $T_9$ metal on alloying is quite small and results in a small (positive and negative) binding-energy shift of the core electrons of the $T_9$ metal.