Thermodynamic properties of calcium–bismuth alloys determined by emf measurements
| Autor: | Hojong Kim, Dane A. Boysen, David J. Bradwell, Brice Chung, Kai Jiang, Alina A. Tomaszowska, Kangli Wang, Weifeng Wei, Donald R. Sadoway |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Standard molar entropy Electromotive force General Chemical Engineering Enthalpy Inorganic chemistry Analytical chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology EMF measurement 01 natural sciences 0104 chemical sciences Bismuth Gibbs free energy symbols.namesake Differential scanning calorimetry chemistry Electrochemistry symbols 0210 nano-technology Phase diagram |
| Zdroj: | Electrochimica Acta. 60:154-162 |
| ISSN: | 0013-4686 |
| Popis: | The thermodynamic properties of Ca–Bi alloys were determined by electromotive force (emf) measurements to assess the suitability of Ca–Bi electrodes for electrochemical energy storage applications. Emf was measured at ambient pressure as a function of temperature between 723 K and 1173 K using a Ca(s)|CaF 2 (s)|Ca(in Bi) cell for twenty different Ca–Bi alloys spanning the entire range of composition from x Ca = 0 to 1. Reported are the temperature-independent partial molar entropy and enthalpy of calcium for each Ca–Bi alloy. Also given are the measured activities of calcium, the excess partial molar Gibbs energy of bismuth estimated from the Gibbs–Duhem equation, and the integral change in Gibbs energy for each Ca–Bi alloy at 873 K, 973 K, and 1073 K. Calcium activities at 973 K were found to be nearly constant at a value of a Ca = 1 × 10 −8 over the composition range x Ca = 0.32–0.56, yielding an emf of ∼0.77 V. Above x Ca = 0.62 and coincident with Ca 5 Bi 3 formation, the calcium activity approached unity. The Ca–Bi system was also characterized by differential scanning calorimetry over the entire range of composition. Based upon these data along with the emf measurements, a revised Ca–Bi binary phase diagram is proposed. |
| Databáze: | OpenAIRE |
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