Czechoslovak Journal of Physics B

, Volume 29, Issue 2, pp 208–221 | Cite as

Electrical resistivity and thermoelectric power of amorphous niobium-nickel alloys synthetized by vapour quenching

  • Gh. Ilonca
  • T. W. BarbeeJr.
Article

Abstract

Thin film samples (10–20 μ thick) of niobium-nickel alloys in the composition range Nb-5 to 95 at % Ni were vapour quenched by R. F. sputtering onto fused quartz substrates held at a temperature of 450 K. It was found that fully glassy alloys were synthetized in the composition range Nb-30 to 85 at % Ni, 2·5 times larger than reported for splat-quenched alloys. Crystallization temperatures exhibited maxima near the eutectic composition and are comparable to those of splat-quenched materials. At room temperature, the electrical resistivityϱ of these alloys lies between 176–210 μΩ cm, and the absolute thermoelectric power S between 2·20–2·52 μV/K. On increasing the temperature from 4·2 to 775 K, up to which the amorphous alloys are stable, the resistivity of the alloy withχ=0·50 decreases by about 1·5%; the value of dϱ/dT progressively increases with increasing Ni content, becoming positive at 0·50<x<0·75. In the range 90 to 400 K, thedS/dT of all alloys lies between 6–8·5×10−3μV deg−2. The electrical behaviour of these alloys may be treated in terms of electron scattering in disordered structures assuming the nearly free-electron model, in a manner analogous to Ziman's theory of electronic transport in liquid metals.

Keywords

Electrical Resistivity Liquid Metal Crystallization Temperature Composition Range Amorphous Alloy 

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Copyright information

© Academia, Publishing House of the Czechoslovak Academy of Sciences 1979

Authors and Affiliations

  • Gh. Ilonca
    • 1
  • T. W. BarbeeJr.
    • 2
  1. 1.Faculty of PhysicsBabeş-Bolyai UniversityCluj-NapocaRomania
  2. 2.Center for Materials Research Stanford UniversityStanfordUSA

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