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

Relative density changes δρ _f 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 δρ _f recommended as reference data were determined.     

Density and phase diagram of the magnesium–lead system in the region of Mg2Pb intermetallic compound

The phase diagram of magnesium–lead system has been investigated by a new method for phase analysis on the basis of a strong penetrating radiation. The measurements have shown that the standard phase diagram of this system contains inaccuracy in the region of the Mg₂Pb intermetallic compound. New data on the temperature dependences of the solid and the melt densities have been obtained. The density change during the phase transitions has been directly measured.     

Thermal expansion of ChS-139 steel in temperature range 20–720 °C

The article presents the results of investigation of thermal expansion of ChS-139 steel in the temperature range 20–720 °C. Measurements were carried out by dilatometric method with DIL-402C unit manufactured by NETZSCH (Germany) with the error (1.5–2)×10^?7 K^?1. The approximation dependences of thermal coefficient of linear expansion on temperature have been obtained and reference tables have been calculated. The abnormal change of expansion coefficient above 550 °C is shown, and the explanation of the phenomenon is given.     

Mutual Diffusion in Liquid Rubidium–Bismuth Alloys

The mutual diffusion in rubidium–bismuth melts was investigated using a gammaray attenuation technique. The concentration dependence of the interdiffusion coefficient has two maxima in the vicinity of 25 and 50 at.% Bi. The analysis based on Darken’s relation shows that this feature is connected to a tendency for the formation of associated complexes in the liquid alloys.     

Thermal Diffusivity and Thermal Conductivity of Neodymium in the Temperature Range 293 to 1773 K

Thermal conductivity and thermal diffusivity weremeasured for the first time by the laser flash method in the temperature range of thermal diffusivity of neodymium from 293 to 1773 K, including regions of phase transitions. The results are compared with the available literature data. Reference tables for neodymium heat transfer coefficients are designed for scientific and practical use. The possibility to predict the thermal conductivity of neodymium liquid and β-phase using the Wiedemann–Franz law is shown.