Electron transport studies of Ni33Zr67-based metallic glasses containing H, B, Al and Si

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Abstract
The electrical resistivity has been measured on Ni33Zr67Hx (033Zr67)1-xXx (X=B, Al or Si) (033Zr67)1-xAlx metallic glasses in the range 77-300 K. Except for the 15 at.% B alloy, the resistivity is found to follow well the equation rho / rho 0=A+B exp(-T/ Delta ) in the range 30-300 K. This is a characteristic feature of the so called group (4) metallic glasses containing appreciable numbers of d electrons at EF. The characteristic temperature Delta is found to increase generally with increasing Debye temperature theta D. The authors also found that the resistivity at 300 K is always larger than about 180 mu Omega cm and increases almost linearly with decreasing density of states at EF for all ternary alloys studied. Assuming that the mean free path in such a high-resistivity regime is constrained by an average atomic distance, they have reached a conclusion that d-electron conduction is significant in all these metallic glasses.