Abstract
The electrical transport properties of (Ni0.8Nb0.2)100－xZrx (x = 30, 40 and 50) amorphous ribbons and hydrogen charged specimens were investigated. The amorphous ribbons indicated a negative coefficient in the temperature dependence of their electrical resistivity as well as the typical transport properties of the amorphous alloys with comparatively high values of electrical resistivity, ρ. The normalized temperature coefficient of the resistivity (TCR ≡ 1/ρ300K·dρ/dT) tended to increase with increasing x in the temperature range of 100-300 K. These behaviors would suggest that the transport properties of the present amorphous ribbons were governed by temperature variation of the Debye-Waller factor, not by electron-phonon scattering. The hydrogen charged ribbons obtained by an electrochemical method also showed similar electrical resistivity behaviors as a function of the temperature. However, TCR of x = 40 with hydrogen charged ribbon, in which the amount of absorbed hydrogen was about 14 at%, increased about three times more than that of the pre-charged amorphous ribbon.
Highlights
Ni-Nb-Zr ternary alloys have been known to form a glassy or amorphous phase over a wide concentration region [1], that is, amorphous alloys can be obtained in the composition range of 20 to 75 at% Ni, 0 to 60 at% Nb and 0 to 80 at% Zr
The amorphous ribbons indicated a negative coefficient in the temperature dependence of their electrical resistivity as well as the typical transport properties of the amorphous alloys with comparatively high values of electrical resistivity, ρ
Glassy alloys are fabricated in a certain composition range, i.e., 50 to 70 at% Ni, 5 to 35 at% Nb and 5 to 45 at% Zr, and it has been reported that the largest value of the supercooled liquid region is about 50 K for Ni60Nb20Zr20 [1]
Summary
Ni-Nb-Zr ternary alloys have been known to form a glassy or amorphous phase over a wide concentration region [1], that is, amorphous alloys can be obtained in the composition range of 20 to 75 at% Ni, 0 to 60 at% Nb and 0 to 80 at% Zr. Fukuhara et al have found interesting electrical transport properties in hydrogen absorbed [(Ni0.6Nb0.4)1−x/100Zrx/100]100−yHy (30 < x < 50, 0 < y < 20) amorphous ribbons such as superconductivity, electron avalanche behavior and the Coulomb-blockade oscillations [4,5]. They stressed that localization effect of the hydrogen in the outside and inside space of the distorted icosahedral Zr5Ni5Nb3 clusters plays important roles in their various electrical transport properties. Temperature dependence of the electrical resistivity was measured in temperature range of 6 - 300 K
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