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Abstract
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) | CaF2-SrF2 | Sr(in Sb) electrochemical cell was used to measure emf values at 833–1113 K for Sr mole fractions over xSr = 0.03–0.84. The activity of Sr in liquid Sb was as low as 6.9 × 10−13 at 973 K and xSr = 0.03, implying strong chemical interactions. Six intermetallic compounds were confirmed by X-ray diffraction (XRD): SrSb2, Sr2Sb3, Sr11Sb10, Sr16Sb11, Sr5Sb3, and Sr2Sb. Phase transition temperatures were verified by differential scanning calorimetry (DSC) for xSr = 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 xSr = 0.50.
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