Vladimir I. Minchenko

Sound Wave Propagation in Immiscible AgBr+LiCl Melts

Abstract The velocity of sound wave propagation was measured for the biphasic region of AgBr+LiCl melts using the pulse method at temperatures from melting point to mixing temperature. It was found that temperature dependences of sound velocities on the saturation lines have opposite signs because of the different effect of thermal motion of the particles and the phases’ composition at the sound velocity. The difference between the sound velocities in the coexisting phases, Δu, is described by the exponential equation Δu≈(Tc−T)θ where the exponent is 0.865. This index is close to the values found in salt families formed with silver iodide and lithium and sodium halides but occurs at a lower value than that found for alkali halide melts between each other. The sound velocities in the phases take the same value 1612 m s−1 at the upper critical consolute temperature Tc=843 K. For a family of stratified silver halide containing melts, the versatility of the temperature dependence of the sound velocity near the critical point of mixing is declared. The sound velocity is discussed from the viewpoint of the different character of chemical bonds of salts.

Ultrasound velocity and adiabatic compressibility of molten GdCl3 and its solutions in potassium chloride

The ultrasound velocity in the melts of gadolinium chloride and its mixtures with potassium chloride is measured as a function of the temperature and composition, and their adiabatic compressibilities are calculated. A relation is established between the relative deviations of these properties from their values for hypothetic ideal solutions.

Ultrasound velocity and adiabatic compressibility of LaCl3 + MCl (M = Li, Na, K, Rb, and Cs) melts

The ultrasound velocity in binary LaCl3 + MCl (M = Li, Na, K, Rb, and Cs) melts is measured, and their adiabatic compressibility is calculated as a function of temperature and composition. A relation is established between the relative deviations of these properties from their values for hypothetic ideal salt mixtures, on the one hand, and the ionic potentials of the alkali-metal cations, on the other.

Isothermal compressibility, isochoric heat capacity, and intrinsic pressure of KCl-NdCl3 melts

The temperature dependences of the isothermal compressibility, isochoric heat capacity, intrinsic pressure, expansion work, number of vibrational degrees of freedom, and parameter a of KCl-NdCl3 melts are calculated from experimental data on the ultrasound velocity, density, and heat capacity of these melts.

Ultrasound velocity and adiabatic compressibility of GdCl3-MCl (M = Na, Cs) melts

The ultrasound velocity in GdCl3 + MCl (M = Na, Cs) chloride melts is measured over wide temperature and composition ranges, and their adiabatic compressibility is calculated. A correlation is established between the relative deviations of these properties from their values in hypothetic ideal salt mixtures and the reciprocal alkali-metal cation radii. The role of lanthanide compression in the propagation of sound vibrations in the chlorides of cerium group REMs is revealed.

Thermal conductivity of NdCl3-MCl (M = Na, K, Cs) melts

The thermal conductivities of individual NdCl3, the K3NdCl6 chemical compound, an equimolar 0.5NdCl3-0.5NaCl mixture, and eutectic 0.5NdCl3-0.5KCl and 0.45NdCl3-0.55CsCl mixtures are measured. For all melts, the concentration and temperature dependences of the thermal conductivity are found.

Sound Velocity and Adiabatic Compressibility of Molten MCl + NdCl3 Mixtures (M = Li, Na, K, and Cs)†

New experimental data on the sound velocity and adiabatic compressibility of molten neodymium trichloride and its binary mixtures containing lithium, sodium, potassium, and cesium chlorides as a function of temperature and composition are reported. It is shown that the relative deviations of sound velocity and adiabatic compressibility of mixtures from their magnitudes inherent to hypothetical ideal solutions vary with ionic potentials of the alkali metal cations.