TY - JOUR
T1 - Thermodynamic properties of rare‐earth alloys by electrochemical emf measurements
AU - Lichtenstein, Timothy
AU - Im, Sanghyeok
AU - Yu, Chen‐Ta ‐T
AU - Kim, Hojong
N1 - Funding Information:
This work was supported by the US National Science Foundation (Grant No. CBET‐1844170), the US Department of Energy, Office of Nuclear Energy's Nuclear Energy University Programs (Award No. DE‐NE0008757), and Integrated University Program Graduate Fellowship (Award No. DE‐NE0000113).
Publisher Copyright:
© The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press.
PY - 2021/1
Y1 - 2021/1
N2 - 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–NdF3 electrolyte relative to pure Nd(s). The emf values from the CaF2–NdF3 electrolyte were verified in separate experiments in molten LiCl–KCl–NdCl3 where 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–NdCl3 for 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. [Figure not available: see fulltext.].
AB - 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–NdF3 electrolyte relative to pure Nd(s). The emf values from the CaF2–NdF3 electrolyte were verified in separate experiments in molten LiCl–KCl–NdCl3 where 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–NdCl3 for 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. [Figure not available: see fulltext.].
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U2 - 10.1557/s43578-020-00061-w
DO - 10.1557/s43578-020-00061-w
M3 - Article
AN - SCOPUS:85101037623
SN - 0884-2914
VL - 36
SP - 70
EP - 78
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 1
ER -