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Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique

机译:电动势技术测定碱土金属合金的热力学性质

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摘要

A novel electrochemical cell based on a CaF2 solid-state electrolyte has been developed to measure the electromotive force (emf) of binary alkaline earth-liquid metal alloys as functions of both composition and temperature in order to acquire thermodynamic data. The cell consists of a chemically stable solid-state CaF2-AF2 electrolyte (where A is the alkaline-earth element such as Ca, Sr, or Ba), with binary A-B alloy (where B is the liquid metal such as Bi or Sb) working electrodes, and a pure A metal reference electrode. Emf data are collected over a temperature range of 723 K to 1,123 K in 25 K increments for multiple alloy compositions per experiment and the results are analyzed to yield activity values, phase transition temperatures, and partial molar entropies/enthalpies for each composition.
机译:为了获得热力学数据,已开发出一种基于CaF2固态电解质的新型电化学电池,以测量二元碱土-液态金属合金的电动势(emf),该电动势是成分和温度的函数。电池由化学稳定的固态CaF2-AF2电解质(其中A是碱土元素,例如Ca,Sr或Ba)和二元AB合金(其中B是液态金属,例如Bi或Sb)组成工作电极和纯A金属参比电极。每个实验中,在723 K至1,123 K的温度范围内以25 K的增量收集了emf数据,并对每种合金成分进行了分析,并对结果进行了分析,以得出每种成分的活度值,相变温度和部分摩尔熵/焓。

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