L. T. Denisova

Thermal physical properties of Bi4Ge3O12 single crystals

The heat capacity, thermal conductivity, thermal diffusivity, and thermal expansion of Bi4Ge3O12 single crystals have been measured over a wide temperature range.

High-temperature heat capacity of oxides in the GeO2-PbO system

Data on the heat capacity of Pb3GeO5, Pb5Ge3O11, PbGeO3, and PbGe3O7 oxides over a wide range of temperatures have been obtained.

High-temperature heat capacity and thermodynamic properties of Tb2Sn2O7

Tb2Sn2O7 has been prepared by solid-state reaction in air at 1473 K over a period of 200 h and its isobaric heat capacity has been studied experimentally in the range 350–1073 K. The Cp(T) data for this compound have no extrema and are well represented by the classic Maier–Kelley equation. The experimental Cp(T) data have been used to evaluate the thermodynamic properties of terbium stannate (pyrochlore structure): enthalpy increment H°(T)–H°(350 K), entropy change S°(T)–S°(350 K), and reduced Gibbs energy Ф°(Т).

High-temperature heat capacity of oxides in the Bi2O3-SiO2 and Bi2O3-GeO2 systems

Experimental data on the heat capacity of the Bi2SiO5 oxide compound and eutectic compositions 75 mol % Bi2O3 + 25 mol % SiO2 and 65 mol % Bi2O3 + 35 mol % GeO2 have been obtained for a wide temperature range.

Heat capacity and thermodynamic properties of bismuth orthovanadate in the temperature range 356–980 K

The molar heat capacity of BiVO4 has been measured in the range 356–980 K by the differential scanning calorimetry method. There is an extreme point in the Cp = f(T) curve at about T = 532 K, which is caused by the existence of a phase transition. The thermodynamic properties of bismuth orthovanadate have been determined from the experimental data.

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 the BiFeO3 multiferroic

Data on the heat capacity of the BiFeO3 multiferroic have been obtained within a broad temperature interval. Correlation has been established between the composition of the Bi2O3-Fe2O3 pseudobinary system and the specific heat capacity of the oxide compounds.

Contact interaction of Bi2O3-SiO2 melts with gold

Contact interaction between Bi2O3-SiO2 melts and gold has been studied by the sessile drop method. The melts are shown to spread over gold and dissolve it.

Synthesis and heat capacity of PrVO4 in the temperature interval of 396–1023 K

The heat capacity of orthovanadate PrVO4 prepared via solid-phase synthesis was measured by differential scanning calorimetry in the temperature interval of 396–1023 K. The experimental heat capacities were used to calculate the thermodynamic functions of PrVO4 (enthalpy change H0(T) − H0(396 K) and entropy change S0(T) − S0(396 K)).

Heat capacity of rare-earth cuprates, orthovanadates, and aluminum garnets, gallium garnets, and iron garnets

The correlation between the heat capacities of rare-earth cuprates, orthovanadates, and garnets with ionic radius R3+ has been analyzed. It has been shown that the values of Cp0 change consistently depending on the radius R3+ within the corresponding tetrads (La-Nd, Pm-Gd, Gd-Ho, Eu-Lu).