TY - JOUR
T1 - Thermodynamic properties of Nd-Fe alloys via emf measurements in LiCl-KCl-NdCl3 electrolyte
AU - Im, Sanghyeok
AU - Gesualdi, Jarrod
AU - Kim, Minkyu
AU - Asghari-Rad, Peyman
AU - Varnell, Kelly Elizabeth
AU - Kim, Hojong
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2024/1/5
Y1 - 2024/1/5
N2 - The thermodynamic properties of Nd-Fe alloys with varying mole fractions of Nd (xNd = 0.05–0.78) were investigated via electromotive force (emf) measurements in molten chloride at 773–1073 K. The Nd-Fe alloys were heat-treated at 923 K for 7 days to stabilize equilibrium phases, and the phase transition properties were confirmed by X-ray diffraction, electron microscopy, and differential scanning calorimetry. Employing less reactive Nd-Sn alloys (xNd = 0.10, L + NdSn3) as a reference electrode, the measured emf values were consistent between alloy compositions, as shown by equivalent thermal trajectories in distinct two-phase regions of [Fe + Nd2Fe17], [Nd2Fe17 + Nd5Fe17], [Nd5Fe17 + Nd], [L + Nd2Fe17], and [L + Nd5Fe17]. The measured emf results were further validated using open-circuit potentiometry in which Nd was deposited onto an Fe electrode at 973 K, resulting in a difference of less than 18 mV for the identical two-phase alloy between the two methods.
AB - The thermodynamic properties of Nd-Fe alloys with varying mole fractions of Nd (xNd = 0.05–0.78) were investigated via electromotive force (emf) measurements in molten chloride at 773–1073 K. The Nd-Fe alloys were heat-treated at 923 K for 7 days to stabilize equilibrium phases, and the phase transition properties were confirmed by X-ray diffraction, electron microscopy, and differential scanning calorimetry. Employing less reactive Nd-Sn alloys (xNd = 0.10, L + NdSn3) as a reference electrode, the measured emf values were consistent between alloy compositions, as shown by equivalent thermal trajectories in distinct two-phase regions of [Fe + Nd2Fe17], [Nd2Fe17 + Nd5Fe17], [Nd5Fe17 + Nd], [L + Nd2Fe17], and [L + Nd5Fe17]. The measured emf results were further validated using open-circuit potentiometry in which Nd was deposited onto an Fe electrode at 973 K, resulting in a difference of less than 18 mV for the identical two-phase alloy between the two methods.
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U2 - 10.1016/j.jallcom.2023.172650
DO - 10.1016/j.jallcom.2023.172650
M3 - Article
AN - SCOPUS:85175633767
SN - 0925-8388
VL - 970
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 172650
ER -