V. M. Ivenko, V. Yu. Shishkin
ABSTRACT:
The solubility of silver in a K–KCl melt at a temperature of 775°C and a change in the potassium content in the melt from 0 to 100 mol %, which has a stratification region at this temperature, is investigated. It is shown that the solubility of silver increases linearly with an increase in the concentration of alkali metal, and in molten potassium it is 4.1 mol % Ag.
KEY WORDS:
melts, solutions, silver, potassium, potassium chloride
T. M. Taova, V. N. Lesev, F. M. Mal’surgenova
ABSTRACT:
The densities and molar volumes of ternary alloys located on two secant lines going towards Cs and K vertices in Na–K–Cs concentration triangle and including the 13.9Na + 43.5K + 42.6Cs (in at %) eutectic alloy with the melting point of 195.2 K have been presented. The isotherms of density of the ternary alloys for the both sections show a positive deviation from additive law, while the isotherms of the molar volumes correspond to the last law.
KEY WORDS:
density, molar volume, ternary alloy, alkali metal, eutectic alloy, sodium-potassium-cesium
V. D. Aleksandrov, S. A. Frolova, E. A. Pokintelitsa, A. P. Zozulya, Sh. K. Amerkhanova
ABSTRACT:
A scheme for the cluster structure of a binary melt of the eutectic type in superheated and supercooled states with respect to the liquidus temperatures is developed. The dynamics of the change in the structure of a clustered liquid with cooling and further equilibrium and nonequilibrium crystallization is analyzed. The regions of coexistence of a liquid solution with clusters, nucleus, and a solid phase are indicated. The boundaries of cluster demixing and the ways of their transformation into eutectic colonies are determined by the binodal. Thermograms of cooling characterizing various types of alloys crystallization are considered. On their basis, an analysis of the ways of crystallization from the state diagram is given.
KEY WORDS:
melts, binary system, alloys, state diagram, eutectic, clusterization, nucleus, equilibrium and nonequilibrium crystallization, thermograms, binodal, demixing
Ye. V. Kirillova
ABSTRACT:
Capacitance–potential dependences for rhenium electrode in molten NaCl, KCl, CsCl were obtained at various temperatures and ac frequencies. Impedance parameters were calculated. It was shown that the capacitance curves in these systems are generally parabolic with two minima, whereas three minima were found in sodium and potassium chlorides at relatively low temperatures. Cathodic potential of minimum capacitance measured within ac range 103 Hz coincides with the corresponding minimum of double layer capacitance obtained by impedance fitting. Medium and anodic potentials of minimum capacitance measured within ac range 1 Hz coincide with the two minima of adsorption capacitance.
KEY WORDS:
rhenium, molten alkali chlorides, capacitance, impedance, potential of minimum capacitance, adsorption