Activity Measurements of Liquid Ga–Te and Ga–Sb Alloys by EMF Method with Solid Electrolyte

Abstract

of galvanic cells with the solid electrolyte (ZrO2+CaO) was measured to determine the activities of gallium at high temperatures in the whole composition range for liquid Ga-Te and Ga-Sb alloys, and some thermodynamic functions were derived from the results. The cells used were as follows:The activities of gallium in liquid Ga-Te alloys at 1123 K showed large negative deviations from Raoult's law on the Te-rich side, and increased remarkably in the middle concentration range from negative to positive deviations from ideality. The activities of gallium in liquid Ga-Sb alloys at 1073 K showed moderate negative deviations from the ideality in the whole composition range. These data are compared with published data.

Experimental Determination fo Ga Activity in Liquid Ga-Sb-Tl Alloys by EMF Method

“…The present study is performed in the course of our program of experimental thermodynamic studies of gallium-antimony and gallium-indium based ternary alloys at high temperatures by use of an EMF method to determine the activity of gallium in the liquid Ga-Sb-Tl alloys. Activity of gallium in the liquid Ga-Sb and Ga-Tl alloys show negative and large positive deviations from ideal solution behavior , respectively, as shown in our previous papers [1,2], but there seem no experimental activity data for Ga-Sb-Tl alloys hitherto.…”

“…Integral excess Gibbs energies of mixing were derived according to Darken's method from the two binary data of Ga-Sb and Ga-Tl systems combined with the ternary data along pseudobinary system of (Sb y Tl 1-y )-Ga (** in the Table ) and also from the combination of the ternary data and basal binary data of Sb-Tl system (* in the Table ). Dragan et al [4] reported the thermodynamic properties in this system at 1073K obtained by use of several thermodynamic models [5] based on the constituent three binary data; Ga-Sb [1], Ga-Tl [2] and Sb-Tl [6]. One of the results is shown in Fig.…”

Activity measurement of liquid Ga‐In‐Te alloys by emf method with stabilized zirconia

“…Fig. 4 shows the concentration dependence of the gallium activity at 1073 K along the pseudobinary systems (In y Te 1− y )‐Ga ( y = 0.25, 0.50, 0.75) with those of the binary systems of Ga‐In [16] and Ga‐Te [14], which are shown in the figure with black symbols. The figure shows that the order of activity values at the same gallium concentration is very complicated.…”

“…To calculate Δ G XS by these equations, fitting parameters for binary alloys using the following Redlich–Kister polynomial were obtained from the experimental data [16, 14, 17] from 1000 to 1200 K at intervals of 50 K, where …”

“…For liquid Ga‐Te alloys the enthalpy of mixing [10], the specific heat [11] and heat content / have been measured. The activity of Te in this system was derived by Predel et al [13] from vapour pressure measurements at 1114 K and the activity of Ga was measured by us [14] from 931 to 1180 K by the emf method. The activity of Ga shows large negative deviations from ideal behaviour in the tellurium‐rich region and positive deviations in the gallium‐rich region.…”