TY - JOUR
T1 - Thermodynamic properties of strontium-lead alloys determined by electromotive force measurements
AU - Nigl, Thomas P.
AU - Lichtenstein, Timothy
AU - Smith, Nathan D.
AU - Gesualdi, Jarrod
AU - Kong, Yuran
AU - Kim, Hojong
N1 - Funding Information:
This work is supported by the US Department of Energy, Office of Nuclear Energy’s Nuclear Engineering University Program (Award No. DE-NE0008425) and Integrated University Program Graduate Fellowship (Award No. DE-NE0000113). The authors acknowledge Jorge Paz Soldan Palma for discussions regarding thermodynamic modeling.
PY - 2018
Y1 - 2018
N2 - The thermodynamic properties of Sr-Pb alloys were determined by electromotive force (emf) measurements. A Sr(s)|CaF2-SrF2|Sr(in Pb) electrochemical cell was used to measure emf values at 773–1073 K for Sr-Pb alloys at mole fractions xSr = 0.07–0.59. These emf measurements were used to determine thermodynamic properties of Sr-Pb alloys, including activity, partial molar entropy, and partial molar enthalpy. At 873 K, activity values of Sr in Pb were as low as aSr = 1.72 × 10–9 at mole fraction xSr = 0.07, implying strong atomic interactions between Sr and Pb. Phase transition temperatures of Sr-Pb alloys, observed during emf measurements, were corroborated by thermal analysis (0.07 ≤ xSr ≤ 0.34) by differential scanning calorimetry (DSC), and the phase constituents of Sr-Pb alloys (0.07 ≤ xSr ≤ 0.75) were characterized using X-ray diffraction (XRD). Experimentally-determined thermodynamic properties were compared to the assessed thermodynamic properties of the Sr-Pb system, confirming the phase transition temperatures and highlighting discrepancies in solution properties (activity and excess Gibbs energy).
AB - The thermodynamic properties of Sr-Pb alloys were determined by electromotive force (emf) measurements. A Sr(s)|CaF2-SrF2|Sr(in Pb) electrochemical cell was used to measure emf values at 773–1073 K for Sr-Pb alloys at mole fractions xSr = 0.07–0.59. These emf measurements were used to determine thermodynamic properties of Sr-Pb alloys, including activity, partial molar entropy, and partial molar enthalpy. At 873 K, activity values of Sr in Pb were as low as aSr = 1.72 × 10–9 at mole fraction xSr = 0.07, implying strong atomic interactions between Sr and Pb. Phase transition temperatures of Sr-Pb alloys, observed during emf measurements, were corroborated by thermal analysis (0.07 ≤ xSr ≤ 0.34) by differential scanning calorimetry (DSC), and the phase constituents of Sr-Pb alloys (0.07 ≤ xSr ≤ 0.75) were characterized using X-ray diffraction (XRD). Experimentally-determined thermodynamic properties were compared to the assessed thermodynamic properties of the Sr-Pb system, confirming the phase transition temperatures and highlighting discrepancies in solution properties (activity and excess Gibbs energy).
UR - http://www.scopus.com/inward/record.url?scp=85067621662&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85067621662&partnerID=8YFLogxK
U2 - 10.1149/2.1091814jes
DO - 10.1149/2.1091814jes
M3 - Article
AN - SCOPUS:85067621662
VL - 165
SP - H991-H998
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 14
ER -