S. D. Kirik

High-temperature heat capacity of Sm2CuO4 and Ho2Cu2O5

The heat capacities of Sm2CuO4 and Ho2Cu2O5 have been measured in the temperature ranges 329–839 and 359–751 K, respectively. The experimental data have been used to determine the thermodynamic properties of the oxide compounds.

High-temperature heat capacity of Sc2Cu2O5

The molar heat capacity of Sc2Cu2O5 has been determined at temperatures from 350 to 893 K using differential scanning calorimetry. The experimental Cp(T) data have been used to evaluate the thermodynamic functions of the double oxide.

High-temperature heat capacity of La2CuO4

The heat capacity of La2CuO4 has been measured in the temperature range 400–950 K. The temperature dependence of the heat capacity has been found to exhibit an extremum at 526 K.

High-temperature heat capacity of CuGa2O4

Experimental data on the heat capacity of CuGa2O4 in the range 329–1050 K are presented. The values of the thermodynamic functions (enthalpy and entropy changes) are calculated from smoothed values of the heat capacity.

High-temperature heat capacity of Bi2CuO4

The heat capacity of Bi2CuO4 has been measured over a wide temperature range. The thermodynamic functions of the solid oxide compound have been calculated using the experimental data.

Carbothermal synthesis of TiB2 powders of micron size

The characteristic details of the carbothermal synthesis of TiB2 powders from the stoichiometric mixture TiO2–H3BO3–C at temperatures lower 1700 K are investigated using thermal analysis (ТG—thermogravimetry and DSC—differential scanning calorimetry), as well as X-ray diffraction and scanning electron microscopy. In the temperature interval 300 K → 1673 K → 1273 K and at a heating rate of 10 K/min, the reaction in the powder mixture begins at approximately 1300 K and ends at 1470 K during cooling. After 3 h of isothermal synthesis at 1473 K, the TiB2 yield is more than 90%. The resulting products are hexagonal plate-like crystals 5–10 μm across with thickness of 3 to 4 μm. Kinetic analysis showed that in the temperature range of 1330 to 1673 K the TiB2 synthesis reaction is of the first-order, and the calculated activation energy of the process is 315 ± 24 kJ/mol.

Catalytic properties of composite materials based on mesoporous silica and zirconium hydrogen phosphate

We have synthesized composite materials based on SBA-15 mesoporous silica and zirconium phosphate. The materials have been characterized by scanning electron microscopy, transmission electron microscopy, inductively coupled plasma mass spectrometry, X-ray diffraction, BET measurements, 31P NMR spectroscopy, and thermogravimetry, and have been employed as catalysts for ethanol dehydration. Even though their catalytic activity is somewhat lower than that of fine-particle zirconium phosphates with layered and framework structures, they offer an increased ethylene yield at low temperatures.

High-temperature heat capacity of Dy2Cu2O5

Data on the heat capacity of Dy2Cu2O5 in the temperature range 346–981 K have been obtained. The experimental data have been used for determining the thermodynamic properties of this oxide compound.

High-temperature heat capacity of Y2Cu2O5

The temperature dependence of the molar heat capacity of Y2Cu2O5 has been measured at 328–953 K. The thermodynamic functions of the oxide compound have been calculated from the experimental data.

Heat capacity of Tb2Cu2O5 in the temperature range 379–924 K

The heat capacity of Tb2Cu2O5 in the temperature range 379–924 K has been measured using differential scanning calorimetry. It has been shown that the obtained dependence Cp = f(T) can be described by a combination of the Debye and Einstein functions.