Topic
Standard molar entropy
About: Standard molar entropy is a research topic. Over the lifetime, 1586 publications have been published within this topic receiving 29886 citations.
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TL;DR: In this article , structural and thermophysical properties of Nd3+ substituted Y3Al5O12 (YAG) were investigated for burning minor actinides (MA) for reducing the long-term radiotoxicity of nuclear wastes.
3 citations
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TL;DR: In this article, the temperature dependencies of the molar enthalpy, molar entropy and Gibbs molar free energy determined from experimental values of molar specific heat capacity are reported.
Abstract: Part I of the paper discussed the temperature dependencies of the electrical resistivities, thermal conductivities, thermal diffusivities and total hemispherical emissivities of several vacuum plasma-sprayed (VPS) and cold-sprayed (CS) copper alloy monolithic coatings, VPS NiAl, VPS NiCrAlY, extruded GRCop-84 and as-cast Cu-17(wt.%)Cr-5%Al. Part II discusses the temperature dependencies of the constant-pressure specific heat capacities, C
P, of these coatings. The data were empirically regression-fitted with the equation: $${\varvec{C}}_{\mathbf{P}} = {\mathbf{ AT}}^{\mathbf 4} + {\mathbf{BT}}^{\mathbf 3} + {\mathbf{CT}}^{\mathbf 2} + {\mathbf{DT}} + \varvec{E}$$
where T is the absolute temperature and A, B, C, D and E are regression constants. The temperature dependencies of the molar enthalpy, molar entropy and Gibbs molar free energy determined from experimental values of molar specific heat capacity are reported. Calculated values of C
P using the Neumann–Kopp (NK) rule were in poor agreement with experimental data. Instead, a modification of the NK rule was found to predict values closer to the experimental data with an absolute deviation less than 6.5%. The specific molar heat capacities for all the alloys did not agree with the Dulong–Petit law, and C
P > 3R, where R is the universal gas constant, were measured for all the alloys except NiAl for which C
P < 3R at all temperatures.
3 citations
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TL;DR: In this paper, it was shown that the standard entropy of binding of molecules by crystals under standard conditions (1 atm, 25°C) can be assessed rather accurately from geometric and physical parameters of the molecule and the average amplitude of the molecular motions in crystals estimated in previous work.
Abstract: One of the main problems in attempts to predict the binding constants of molecules (or free energies of their binding) is the correct evaluation of configurational binding entropy. This evaluation is possible by methods of molecular dynamics simulation, but these simulations require a lot of computational time. Earlier, we have developed an alternative approach which allows the fast calculation of the binding entropy from summarizing the available data on sublimation of crystals. Our method is based on evaluating the mean amplitude of the movements that are restricted in the bound molecule, e.g., in a crystal, but are not restricted in the free state, e.g., in vapor. In this work, it is shown that the standard entropy of binding of molecules by crystals under standard conditions (1 atm, 25°C) can be assessed rather accurately from geometric and physical parameters of the molecule and the average amplitude of the molecule motions in crystals estimated in our previous work.
3 citations
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TL;DR: In this article, the enthalpies of ZrCl3(cr) and ZrCL4(cr)+HCl(sln,17.06H2O) were measured in a 0.1 dm3 reaction vessel of the isoperibol calorimeter LKB-8700.
3 citations
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TL;DR: In this article, the standard molar Gibbs free energies of BaZrO3 and Ba2zrO4 have been determined by solid state galvanic cells involving a single crystal CaF2 as a solid-state electrolyte.
3 citations