Thermodynamic Properties of Sr–Sn Alloys via Emf Measurements and Thermal Analysis
Thermodynamic Properties of Sr–Sn Alloys via Emf Measurements and Thermal Analysis
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DOI：
10.1149/1945-7111/ab8de1
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发表时间：
2020-04
影响因子：
3.9
通讯作者：
N. Smith;Jorge Paz Soldan-Palma;Yuran Kong;Zi-kui Liu;Hojong Kim
中科院分区：
文献类型：
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作者：
N. Smith;Jorge Paz Soldan-Palma;Yuran Kong;Zi-kui Liu;Hojong Kim
为了评价液态锡作为从熔盐溶液中分离碱土元素的相互作用电极材料的性能，用电动势法测定了锶锡合金的热化学性质。用锶(S)|CaF_2-SrF_2|Sr(In-Sn)池测量了12种锶-锡合金在摩尔分数XSR=0.02-0.43范围内的电动势，从而确定了730-1110K范围内锶的活度和部分摩尔吉布斯能、熵和热焓等热化学性质。在800K和XSR=0.02下，锡中锶的活度值低至6.9×10-12，表明锶和锡之间存在着极不理想的溶解行为。根据电动势数据确定了相变，并通过差示扫描量热仪(DSC)进行了验证。通过对热化学性质的电动势测量、相组成的X射线衍射分析和相变的DSC测量相结合，本工作建立了更完整的锶锡二元系的热力学性质。
The thermochemical properties of Sr-Sn alloys were determined by electromotive force (emf) measurements to evaluate liquid tin as an interacting electrode material for separating alkaline-earth elements from molten salt solutions. A Sr(s)|CaF2-SrF2|Sr(in Sn) cell was used to measure emf values for twelve Sr-Sn alloys at mole fractions xSr = 0.02‒0.43, allowing the determination of thermochemical properties such as activity and partial molar quantities of Gibbs energy, entropy, and enthalpy of Sr at 730‒1110 K. Activity values of Sr in liquid Sn were as low as 6.9×10‒12 at 800 K and xSr = 0.02 indicating highly non-ideal solution behavior between Sr and Sn. Phase transitions were also determined from the emf data and were validated via differential scanning calorimetry (DSC). Through the combination of emf measurements for thermochemical properties, X-ray diffraction (XRD) for phase constituents, and DSC measurements for phase transitions, this work established more complete thermodynamic properties of the Sr-Sn binary system.