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Thermal Transport Properties of Ordered and Disordered Ni3Fe

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4 Author(s)
Moore, J.P. ; Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 ; Kollie, T.G. ; Graves, R.S. ; McElroy, D.L.

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Thermal conductivity λ, electrical resistivity ρ, and Seebeck coefficient S measurements have been made from 80 to 400 K on a Ni3Fe alloy (74.77‐at. % Ni and 25.33‐at. % Fe) in both disordered and highly ordered states. The effect of lattice disorder is to lower λ and S and increase ρ. Although λ and ρ for the three states studied differ by about 50%, the Lorenz ratios λρ/T are the same to within the combined uncertainty of the measurements. This ratio is near the Sommerfeld value Lo from 200 to 400 K, and the positive deviation from Lo below 200 K indicates a significant lattice component to λ in all states of disorder. The thermal conductivities of the three states of Ni3Fe exhibit peaks between 142 and 175 K. The unusual relative shift of the temperatures of the maximum conductivities is related directly to the large deviation of the electrical resistivity differences from Matthiessen's rule.

Published in:

Journal of Applied Physics  (Volume:42 ,  Issue: 8 )

Date of Publication:

Jul 1971

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