Summary As part of a larger study of the physical properties of potential ceramic hosts for nuclear wastes, we report the molar heat capacity of brannerite (UTi2O6) and its cerium analog (CeTi2O6) from 10 to 400 K using an adiabatic calorimeter. At 298.15 K the standard molar heat capacities are (179.46±0.18) J K-1 mol-1 for UTi2O6 and (172.78±0.17) J K-1 mol-1 for CeTi2O6. Entropies were calculated from smooth fits of the experimental data and were found to be (175.56±0.35) J K-1 mol-1 and (171.63±0.34) J K-1 mol-1 for UTi2O6 and CeTi2O6, respectively. Using these entropies and enthalpy of formation data reported in the literature, Gibb’s free energies of formation from the elements and constituent oxides were calculated. Standard free energies of formation from the elements are (-2814.7±5.6) kJ mol-1 for UTi2O6 and (-2786.3±5.6) kJ mol-1 for CeTi2O6. The free energy of formation from the oxides at T=298.15 K are (-5.31±0.01) kJ mol-1 and (15.88±0.03) kJ mol-1 for UTi2O6 and CeTi2O6, respectively.
phenomenon remain in quest. With a view to ascertain the behaviour of eutectic phenomenon in the phase equilibria, excess thermodynamicfunctions are thought to be the best tool to reveal the molecular interactions between the binary condensed phases
The deviation from the ideal behavior can best be expressed in terms of excess thermodynamicfunctions, namely, excess free energy ( g E ), excess enthalpy ( h E ), and excess
The deviation from the ideal behavior can best be expressed in terms of excess thermodynamicfunctions, namely, excess free energy ( g E ), excess enthalpy ( h E ), and excess entropy ( s E ) which give more quantitative idea about the nature of
thermodynamic characteristics and interpret them in terms of physical chemistry, to calculate the standard thermodynamicfunctions C p 0 (T), H °( T ) − H °(0), S °( T ) − S °(0) and G °( T ) − H °(0) over the temperature range from T → 0 to (550–580) K
functions, g ( α ). The activation energy, E , and pre-exponential factor, A , were estimated. The transition state thermodynamicfunctions, Δ H *, Δ G * and Δ S *, were calculated via the activated complex theory.
) and thermodynamicfunctions (Δ H ∗, Δ G ∗, and Δ S ∗) via the Kissinger method is reported on the basis of thermal analysis techniques. To the best of our knowledge, such a facile and acetone-mediated synthesis route, kinetic and thermodynamic studies
by the AC and DSC techniques. Two special thermal phenomena were discovered and the mechanism was deduced. The temperature, T trs , molar enthalpies, Δ trs H m , molar entropies, Δ trs S m , of the phase transitions and thermodynamicfunctions, [ H T
Studies involving the determination of thermodynamicfunctions as a function temperature have gained importance in view of the insight they provide about systems behavior at micro level at the temperature studied