Thermodynamic properties of rare-earth alloys by electrochemical emf measurements

Timothy Lichtenstein, Sanghyeok Im, Chen Ta Yu, Hojong Kim

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4 Scopus citations


Thermodynamic properties of Nd-Bi and Nd-Sn alloys were determined via electromotive force (emf) measurements at 725-1075 K. The emf measurements of an Nd-Bi alloy at mole fraction xNd= 0.20 were conducted using a solid CaF2-NdF3electrolyte relative to pure Nd(s). The emf values from the CaF2-NdF3electrolyte were verified in separate experiments in molten LiCl-KCl-NdCl3where pure Nd(s) was electrodeposited. The Nd-Bi (xNd= 0.20) exhibited two-phase behavior with a peritectic reaction (L + NdBi = NdBi2) at 926 K from differential scanning calorimetry. The two-phase Nd-Bi (xNd= 0.20) was employed as a stable reference electrode in molten LiCl-KCl-NdCl3for emf measurements of Nd-Bi (xNd= 0.15-0.40) and Nd-Sn (xNd= 0.10) alloys. The emf measurements of these alloys were reproducible during thermal cycles over 50 h and were used to calculate thermodynamic properties, including the partial molar Gibbs energy, entropy, and enthalpy.

Original languageEnglish (US)
JournalJournal of Materials Research
StateAccepted/In press - 2020

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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