Thermochemical properties and phase transitions of Ba–Sn alloys from thermal characterization and emf measurements

Timothy Lichtenstein, Jarrod Gesualdi, Chen Ta Yu, Hojong Kim

Research output: Contribution to journalArticle

Abstract

Thermodynamic properties of Ba–Sn alloys were determined for Ba mole fractions (xBa = 0.03–0.69) by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and electromotive force (emf) measurements. Six intermetallic compounds (BaSn5, BaSn3, Ba3Sn5, BaSn, Ba5Sn3, and Ba2Sn) were identified by XRD and the phase transition temperatures were determined by DSC up to xBa = 0.50, which were used to delineate phase boundaries for constructing an experimentally-determined phase diagram. In addition, thermochemical solution properties were calculated by measuring emf values of Ba–Sn alloys using the following electrochemical cell: Ba(s) | CaF2–BaF2 | Ba(in Sn) over 713–1063 K, including activity and partial molar quantities of Gibbs energy, entropy, and enthalpy. The activity of Ba in Sn was as low as 1.5 × 10−11 at xBa = 0.03 and 923 K, indicating highly non-ideal solution behavior with a large excess partial molar Gibbs energy (−164 kJ mol−1). By integrating solution properties from emf measurements with the phase behavior by DSC and XRD, a reliable description of the Ba–Sn system was established.

Original languageEnglish (US)
Article number151531
JournalJournal of Alloys and Compounds
Volume811
DOIs
StatePublished - Nov 30 2019

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Electromotive force
Force measurement
Differential scanning calorimetry
Thermodynamic properties
Phase transitions
Gibbs free energy
X ray diffraction
Electrochemical cells
Phase boundaries
Phase behavior
Superconducting transition temperature
Intermetallics
Phase diagrams
Enthalpy
Entropy
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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title = "Thermochemical properties and phase transitions of Ba–Sn alloys from thermal characterization and emf measurements",
abstract = "Thermodynamic properties of Ba–Sn alloys were determined for Ba mole fractions (xBa = 0.03–0.69) by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and electromotive force (emf) measurements. Six intermetallic compounds (BaSn5, BaSn3, Ba3Sn5, BaSn, Ba5Sn3, and Ba2Sn) were identified by XRD and the phase transition temperatures were determined by DSC up to xBa = 0.50, which were used to delineate phase boundaries for constructing an experimentally-determined phase diagram. In addition, thermochemical solution properties were calculated by measuring emf values of Ba–Sn alloys using the following electrochemical cell: Ba(s) | CaF2–BaF2 | Ba(in Sn) over 713–1063 K, including activity and partial molar quantities of Gibbs energy, entropy, and enthalpy. The activity of Ba in Sn was as low as 1.5 × 10−11 at xBa = 0.03 and 923 K, indicating highly non-ideal solution behavior with a large excess partial molar Gibbs energy (−164 kJ mol−1). By integrating solution properties from emf measurements with the phase behavior by DSC and XRD, a reliable description of the Ba–Sn system was established.",
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Thermochemical properties and phase transitions of Ba–Sn alloys from thermal characterization and emf measurements. / Lichtenstein, Timothy; Gesualdi, Jarrod; Yu, Chen Ta; Kim, Hojong.

In: Journal of Alloys and Compounds, Vol. 811, 151531, 30.11.2019.

Research output: Contribution to journalArticle

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AU - Lichtenstein, Timothy

AU - Gesualdi, Jarrod

AU - Yu, Chen Ta

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