High-throughput thermal conductivity measurements of nickel solid solutions and the applicability of the Wiedemann-Franz law

X. Zheng, D. G. Cahill, P. Krasnochtchekov, R. S. Averback, J. C. Zhao

Research output: Contribution to journalArticle

Abstract

Thermal conductivity mapping with a spatial resolution of 3 μm and an acquisition speed of 3 points per second has been applied to binary Ni(Cr), Ni(Pd), Ni(Pt), Ni(Rh) and Ni(Ru) solid solutions to test the applicability of the Smith-Palmer equation and the Wiedemann-Franz law to Ni alloys. The lattice thermal conductivity of pure Ni and Ni(Pd) alloys is calculated by molecular dynamics. After subtracting the lattice component from the total thermal conductivity, the electronic thermal conductivity of pure Ni is 25% smaller than that predicted from the Wiedemann-Franz law. With the addition of solutes of Pt and Rh, the deviation from the Wiedemann-Franz law decreases. However, the negative deviation of the electronic thermal conductivity of Ni(Pd) alloys from the Wiedemann-Franz law increases slightly to 29% when the Pd concentration is 40 at.%. The Smith-Palmer equation is not a generally reliable method for predicting the thermal conductivity of Ni solid solution alloys from measurements of the electrical conductivity.

Original languageEnglish (US)
Pages (from-to)5177-5185
Number of pages9
JournalActa Materialia
Volume55
Issue number15
DOIs
StatePublished - Sep 2007

Keywords

  • Nickel alloys
  • Thermal conductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Metals and Alloys

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