The thermodynamic properties of Sr-Sb alloys were determined by electromotive force (emf) measurements to understand the solution and phase behavior of Sr in Sb. A Sr(s) | CaF 2 -SrF 2 | Sr(in Sb) electrochemical cell was used to measure emf values at 833–1113 K for Sr mole fractions over x Sr = 0.03–0.84. The activity of Sr in liquid Sb was as low as 6.9 × 10 −13 at 973 K and x Sr = 0.03, implying strong chemical interactions. Six intermetallic compounds were confirmed by X-ray diffraction (XRD): SrSb 2 , Sr 2 Sb 3 , Sr 11 Sb 10 , Sr 16 Sb 11 , Sr 5 Sb 3 , and Sr 2 Sb. Phase transition temperatures were verified by differential scanning calorimetry (DSC) for x Sr = 0.03–0.48. Integrating the thermodynamic properties of the Sr-Sb system from emf, XRD, and DSC measurements, three characteristic transition temperatures were newly defined and an experimentally-determined Sr-Sb phase diagram was constructed up to x Sr = 0.50.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)