Alexander S. Bolgar

Heat Capacity of Gadolinium Germanides at Low Temperatures

We have studied the heat capacity of Gd5Ge3, GdGe, GdGe1.5 for the first time by the adiabatic method at temperatures of 55 K to 300 K. Using low-temperature measurements, we have calculated the values of the enthalpy, the entropy, and the reduced Gibbs energy of the germanides under standard conditions.

Thermodynamic properties of praseodymium germanides in the range 55–1940 K

The heat capacity and enthalpy of Pr5Ge3, PrGe, and PrGe1.8 were investigated over a wide temperature range for the first time. The temperatures, enthalpies, and entropies of melting of these compounds, and of the polymorphic transformation in PrGe1.8 were determined. Temperature dependencies of the basic thermodynamic functions were calculated and are recommended for practical use.

Thermodynamic Properties of Y5Sn3 over a Wide Range of Temperature

The heat capacity and enthalpy of Y5Sn3 were investigated in the temperature range 58-2294 K for the first time. Values of the standard enthalpy, entropy, and reduced Gibbs energy of the stannide were calculated from the low-temperature heat capacity data. The temperature dependencies of the thermodynamic functions for the solid state of Y5Sn3 in the range 298.15-2300 K were found. The temperature, enthalpy, and entropy of melting of the compound were determined.

Heat Capacity of Dysprosium Germanides at 55-300 K

The heat capacities of Dy5Ge3, DyGe, and DyGe2 at low temperatures were determined by an adiabatic method for the first time, and the enthalpies, entropies and reduced Gibbs energies at 298.15 K calculated.

Thermodynamic properties of La2C3 and Gd2C3 at high temperatures

The enthalpies of lanthanum and gadolinium sesquicarbides were determined in the range 400–1900 K by the method of mixtures. The temperature dependences of the basic thermodynamic properties were calculated and tabulated. The temperatures, enthalpies, and entropies of the peritectic reactions were determined.

Heat Capacity of DySi2 and HoSi1.67 at Temperatures of 55-300 K

We have studied the heat capacity of dysprosium and holmium disilicides at low temperatures for the first time by the adiabatic method. Based on low-temperature measurements, we have calculated the values of the enthalpy, entropy, and reduced Gibbs energy under standard conditions.

Enthalpy Research and Thermodynamic Function Calculation for Dy5Ge3, DyGe, and DyGe2 at 298.15-2217 K

Mixing calorimetry has been used to measure the enthalpies of dysprosium germanides at 298.15-2217 K. Values have been derived for the melting points and for the enthalpies and entropies of melting. The temperature dependence of the thermodynamic functions of these compounds has been determined over a wide temperature range.

Thermodynamic Properties of NdSi1.8 and SmSi2 over a Wide Temperature Range

The heat capacity and enthalpy of NdSi1.8 and SmSi2 were investigated in the range 55-2122 K for the first time. The temperature, enthalpy and entropy of the polymorphic transformations and melting of the compounds were determined. The temperature dependencies of the principal thermodynamic functions were established, and are recommended for practical application.