R. N. Abdullaev

The density and the binary diffusion coefficients of silver-tin melts

Temperature dependences of the density of liquid silver-tin melts containing 61.6 and 96.5 wt. % Sn (59.3 and 96.15 at. % Sn) have been determined using gamma-ray attenuation technique over the temperature range from liquidus line to 950 K. The density changes during solid-liquid transition have been directly measured for the first time for eutectic alloy (96.5 wt. % Sn). The temperature and concentration dependences of the thermal properties for Ag-Sn system have been constructed. Kinetics of homogenization of the melts with mean composition of 61.6 wt. % Sn has been investigated in the temperature range from 770 to 950 K. The coefficients of binary diffusion have been derived from these experiments.

The density and interdiffusion coefficients of bismuth-tin melts of eutectic and near-eutectic composition

The method of gamma-raying of samples by a narrow beam of gamma radiation is used to investigate the temperature dependences of the density of bismuth-tin liquid alloys, which contain 30.0, 44.0, and 54.0 at.% Bi, at temperatures from the liquidus line to 920 K. The density jump in the case of solid-liquid phase transition is directly measured for the first time for an alloy of eutectic composition (44.0 at.% Bi). The temperature and concentration dependences of the thermal properties of the liquid Bi-Sn system are constructed. The kinetics of homogenization are studied of melts with average composition of 44.0 and 54.0 at.% Bi at temperatures from 550 to 850 K. The interdiffusion coefficients are determined from the results of these experiments.

Density changes of bismuth and alkaline metals at the transition to the liquid state

Relative density changes δρf of sodium, potassium, rubidium, and bismuth on melting-crystallization were studied using monochromatic gamma-ray attenuation technique. The measurement error of density changes was 0.1–0.12 %. A comparison of the obtained results with the known literature data was carried out, and the values of δρf recommended as reference data were determined.

The density of lead-potassium alloy of eutectic composition

The temperature dependence of the density of eutectic alloy of lead-potassium system (90.7 at. % Pb) was investigated using gamma-ray attenuation technique over the temperature range 293–950 K of solid and liquid states. The density changes during solid-liquid phase transition were directly measured for the first time. The approximating dependences for the density have been obtained, and a comparison of the data of this work with previously published results has been carried out. The reference tables for the temperature dependences of thermal properties of the alloy have been compiled in the entire examined range, and their errors have been estimated.

Thermal conductivity of liquid rubidium in the interval of 312–873 K

The thermal conductivity λ and the thermal diffusivity a of liquid rubidium were measured by the laser flash method in the temperature interval from the melting point up to 873 K. The measurement error was 4–6%. The data of this paper were compared with the results of other authors. Approximation equations and the table of reference values for the temperature dependence of λ and a have been obtained. The dependence of the Lorentz number on temperature has been calculated.

Interdiffusion in lithium–lead melts

Interdiffusion in lithium-lead melts containing 10.0, 15.0, 18.1, 20.0, 25.1, 30.2, 38.2, 40.1, 43.1, 46.7, 50.2, 60.2, and 70.0 at. % Pb was investigated using gamma-ray attenuation technique in the temperature range from 720 to 1030 K. It has been found that the concentration dependence of the interdiffusion coefficient has a maximum in the vicinity of 20 at. % Pb. This phenomenon is shown to relate to a tendency of formation of short-range order in liquid alloys of lithium−lead.

Volumetric properties of near-eutectic liquid Li–Pb alloys

The density and the thermal expansion of liquid lithium–lead alloys with Pb content of 83.0 and 84.3 at. % was measured using gamma-ray attenuation technique over the temperature range from liquidus to 1000 K. The density change during solid–liquid phase transition was directly measured for the first time for Li15.7Pb84.3 alloy. A comparison of the obtained results with literature data has been carried out.

Volumetric properties of liquid K–Pb alloys

The density and thermal expansion coefficients of liquid potassium–lead alloys (30.01, 39.99, 50.00, 66.66, 84.40, and 90.70 at. % Pb) have been determined using gamma-ray attenuation technique over the temperature range from liquidus line to 975 K. The experimental uncertainty of the density measurement is estimated to be within ±0.2–0.4 %. A comparison of the obtained results with literature data has been made. Temperature and concentration dependences of the volumetric properties of liquid K–Pb system have been built and analyzed.

Interdiffusion in potassium-lead melts in a wide range of concentrations

Interdiffusion in potassium-lead melts containing 30, 40, 50, 66.7, and 84.4 at. % Pb was investigated using gamma-ray attenuation technique in the temperature range from 550 to 970 K. It was found that the concentration dependence of interdiffusion coefficient has a maximum in the vicinity of 40–50 at. % Pb. It was shown that this feature is associated with the trend of forming ionic complexes of K4Pb4 in liquid alloys.

The density and thermal expansion of liquid Na-Pb alloys with a low content of lead

The density and thermal expansion coefficients of liquid sodium and sodium-lead alloys (2.50, 5.00, 7.50, 9.99, and 21.03 at. % Pb) were investigated using gamma-ray attenuation technique in the temperature range from the liquidus line up to 950 K. Accuracy of density measurement is estimated to be ± 0.22–0.4 %. Temperature and concentration dependences of thermal properties of liquid system Na-Pb have been built.