Authors:L. Razo, S. Solis, M. Asomoza, and A. Hernandez
The combination of a DuPont 942 thermomechanical analyzer with a CBM computer allowed the establishment of thermodynamic properties
such as isobars, isobaric volumetric expansions, isothermal compressibilities, and the equation of stateV=V(p, T) in a limited region ofpVT space.
Authors:Yan Yao, Ruiling Wang, Xucun Ma, and Pengsheng Song
Emf measurements were made on the cell without liquid junction: Li−ISE LiCl(m1), Li2SO4(m2) Ag/AgCl. The performances of the electrode pairs constructed in our laboratory were tested and exhibited near-Nernstian
behavior. The mean activity coefficients of LiCl for the system Li+−Cl−−SO
−H2O have been investigated by the emf values at temperatures of 0, 15, 35°C and constant total ionic strengths of 0.05, 0.1,
0.5, 1.0, 2.0, 3.0 and 5.0 mol·kg−1. The activity coefficients decrease with increasing temperature and the ionic strength fraction of Li2SO4 in the mixtures. The thermodynamic properties are interpreted by use of Harned's empirical equations and Pitzer's ion interaction
approach including the contribution of higher order electrostatic terms. The experimental results obey Harned's rule and are
described by using Pitzer equations satisfactorily. The activity coefficients of Li2SO4, the osmotic coefficients and the excess free energies of mixing for the system in the experimental temperature range were
With help of literature data and some empirical methods the main thermochemical and thermodynamical properties were estimated
for condensed GaSb, GaS, Ga2S, Ga2S3, Ga4S5, Sb2S3 and for gaseous Ga2S and SbS phases.
A model of an ideal associated solution, containing self-associates of different sizes and shapes, was considered. Calculations
of the thermodynamic properties of mixing of Na-K liquid alloys and of liquidus line positions were carried out. Possible
modifications of the model are discussed.
2CaO·3B2O3·H2O which has non-linear optical (NLO) property was synthesized under hydrothermal condition and identified by XRD, FTIR and
TG as well as by chemical analysis. The molar enthalpy of solution of 2CaO·3B2O3·H2O in HCl·54.572H2O was determined. From a combination of this result with measured enthalpies of solution of H3BO3 in HCl·54.501H2O and of CaO in (HCl+H3BO3) solution, together with the standard molar enthalpies of formation of CaO(s), H3BO3(s), and H2O(l), the standard molar enthalpy of formation of −(5733.7±5.2) kJ mol−1 of 2CaO·3B2O3·H2O was obtained. Thermodynamic properties of this compound were also calculated by a group contribution method.
A research program has been in progress to obtain reliable thermodynamic data on various binary and ternary alkali metal compounds
in the temperature range of 300 to 1500 K. To date, heat capacity measurements have been made on cesium and rubidium chromates,
dichromates, zirconates, molybdates, dimolybdates, and halides in the temperature range of 300 to 800K. In addition, measurements
are planned or are currently in progress on cesium and rubidium chalcogenides, aluminates, uranates, silicates, and several
other lithium, sodium, and potassium compounds. The status of the research program is discussed.
Authors:Ke Liu, Xiao-Lin Zhou, Hai-Hua Chen, and Lai-Yu Lu
change at the transition pressure lies at 9%. So far, there has been considerable controversy for the phase transition of TiN. On the other hand, to the best of our knowledge, the thermodynamicproperties of TiN have not previously been reported. So, we
Authors:O. Pondarevskaya, O. Petrenko, V. Sudavtzova, V. Lisnyak, and N. Stus
Thermodynamic properties of pure titanium stannides obtained by crucible-less growth techniques under vacuum are determined
by differential scanning calorimetry and Knudsen effusion. The enthalpy, specific heat capacity, entropy and Gibbs energy
temperature dependence were simulated using Maier and Kelly equations. Standard enthalpies of evaporation, formation and atomization
of titanium stannides were determined and compared with earlier-known data.
A numerical study of the thermodynamic properties of a superconducting quantum cylinder in a longitudinal magnetic field is carried out. Closed-form expressions for the critical temperature, the free energy, the heat capacity jump, and the magnetization difference between the superconducting and normal phases as functions of the nanotube parameters are obtained in limit cases.
Authors:Zh. V. Dobrokhotova, A. I. Zaitsev, M. A. Zemchenko, A. D. Litvina, B. M. Mogutnov, and S. N. Yaschenko
The thermodynamic properties of calcium and barium phosphides have been determined in the temperature range 1178–1537 K by a Knudsen effusion technique combined with massspectral analysis of the evaporation products.