The results of the calculation of the thermodynamic properties for liquid Ga-Sb-Tl alloys at the temperature 1073 K are presented in this paper. Initially, the most appropriate thermodynamic model for the investigated system was selected. Based on a comparison of the values calculated by different geometric models (Kohler, Muggianu, Toop, Hillert, Chou) with the existing experimental based data, asymmetric models of calculation were determined to give the best results. The asymmetric nature of the investigated ternary system was additionally confirmed by the Chou similarity coefficient concept. For these reasons, further complete thermodynamic calculations were performed according to the Hillert model in five sections of the ternary Ga-Sb-Tl system from each corner with the mole ratio of other two components being 9:1; 7:3; 5:5; 3:7 and 1:9. The obtained results include integral excess Gibbs energy dependences on composition for all the investigated sections. The calculated activity values at 1073 K for all components are given in the form of isoactivity diagrams. Comparison between the calculated and experimentally obtained gallium activities shows good agreement.

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Electromotive force of galvanic cells with zirconia solid electrolytes was measured to determine the activity of gallium in liquid Ga‐In‐Te alloys in the temperature range of 1000 to 1200 K along 3 psuedobinary lines of (InyTe1−y)‐Ga where y= 0.25, 0.50 and 0.75. The mixture of Ga and Ga2O3 was used as a reference electrode. The activity curves of Ga are very complicated at 1073 K. Isoactivity curves at 1073 K in the ternary Ga‐In‐Te alloys were derived by combining the activity data of Ga‐In and Ga‐Te alloys. Using Darken's equation, 2 binary data of Ga‐In and Ga‐Te and ternary data in this study, ΔGXS at 1073 K were derived. The results were compared with those from 3 model calculations proposed by Toop, Kohler and Chou to show better agreement between the experimental values and those by Toop's and Chou's models.

The SrZr1-xYxO3-α of proton conductor was prepared by normal sintering and SPS (spark plasma sintering) methods in order to separate pure hydrogen gas from H2-containing mixed gases in high temperature range. The SrZr1-xYxO3-α has high proton conductivity under H2 gas atmosphere from 973 K to 1273 K. In this hydrogen separation system, hydrogen is oxidized to proton at the anode, and proton is reduced to hydrogen at the cathode using proton conductor by electrochemical method. Proton conductors SrZr0.9Y0.1O3-α obtained by normal sintering at 1580℃ for 10 h and SPS at 1500℃ for 3 min were found to be single phase of perovskite structure. Furthermore, the crystal structure of SrZr0.9Y0.1O3-α was chemically stable under H2 and CO2 gases atmosphere. Relative densities of SrZr0.9Y0.1O3-α obtained by SPS at 1400 and 1500℃ were over 95 %. Furthermore, the relative density increased with sintering temperature and time of SPS. The proton conductivity of SrZr0.9Y0.1O3-α of SPS increased with sintering temperature, and was higher than one of normal sintering under wet 10 % H2 and Ar gases atmosphere. From the measurement of EMF (electromotive force) of hydrogen concentration cell at 800℃ , the ionic transport number of SrZr0.9Y0.1O3-α of SPS at 1400℃ for 5 min was about 1, and the electron conductivity was considerably low.