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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, the behavior of the solubility of HXT in binary solvent mixtures (ethanol+water) as well as the thermodynamic proprieties were studied and the preferential solvation has been determined using the inverse Kirkwood-Buff integral theory.
Abstract: Hydroxytyrosol (HXT) (also known as 3,4-dihydroxyphenylethanol,) is a biophenol extracted from olive. HXT is known for its high antioxidant significance effect. In this work, we focused on the study of the behavior of the solubility of HXT in binary solvent mixtures (ethanol + water) as well as the thermodynamic proprieties. The solubility of HXT in water, ethanol and in binary solvent mixtures (ethanol + water) was measured at five different temperatures from (293.15 to 318.15) K. The enthalpy of fusion and the melting point of HXT were experimentally determined since they are essential for the study of the of solubility and crystallization process. Thermodynamic properties of dissolution of the HXT (Gibbs energy (ΔsolG°), molar enthalpy of dissolution (ΔsolH°), and molar entropy of dissolution (ΔsolS°)) are predicted using the van’t Hoff analysis, the Gibbs equation, and the measured solubilities data. The preferential solvation has been determined using the inverse Kirkwood–Buff integral (IKBI) theory.

4 citations

Journal ArticleDOI
TL;DR: In this article, a combustion synthesis method was used to prepare NdB6 ultra-fine powders with B2O3, NdO3 and Mg powders as the raw materials.

4 citations

Journal Article
TL;DR: In this paper, a 1:1 binary mixture of cyclohexylamine (CHA), ACT, p-chloroacetophenone (PCLA), and CHA+ACT was measured in dilute solutions of benzene at different temperatures.
Abstract: Static permittivity at 100 kHz, complex permittivity at 8.93 GHz and high frequency permittivity at frequency of the Dlines of sodium of cyclohexylamine (CHA), acetophenone (ACT), p-chloroacetophenone (PCLA) and for the binary mixtures of CHA+ACT and CHA+PCLA have been measured in dilute solutions of benzene at different temperatures. The measured values of permittivity and dielectric loss have been used to evaluate relaxation times [τ0, τ(1) and τ(2)], dipole moment (μ), distribution parameter (α) and thermodynamical parameters like molar free energy of activation (ΔF∈), molar enthalpy of activation (ΔH∈) and molar entropy of activation (ΔS∈). The relaxation times of binary mixture compositions are consistent with the computed values obtained from various theoretical methods. Present study suggests the existence of both the intramolecular and overall orientation in both the binary mixtures. Formation of complexes is noticed in 1:1 binary mixture of CHA+PCLA.

4 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of structural phase transitions, features of electronic structure, and magnetic transformation on the temperature dependence of the heat capacity of LnAO4 (A = P, V, Nb) compounds has been considered.
Abstract: The influence of structural phase transitions, features of electronic structure, and magnetic transformation on the temperature dependence of the heat capacity of LnAO4 (A = P, V, Nb) compounds has been considered. It has been shown that the sum of the contributions to the thermodynamic functions due to the phase transition can vary depending on the lanthanide ion. The contribution to the standard entropy caused by low-temperature phase transitions is the most significant.

4 citations

Journal ArticleDOI
TL;DR: In this article, the thermal expansion of orthorhombic CaFe2O4-type ellinaite was studied by high temperature in-situ synchrotron X-ray diffraction measurements in the temperature range of 301-973 K at atmospheric pressure.
Abstract: The thermal expansion of orthorhombic CaFe2O4-type β-CaCr2O4, ellinaite, was studied by high temperature in-situ synchrotron X-ray diffraction measurements in the temperature range of 301–973 K at atmospheric pressure. Based on the obtained data, the thermal expansion coefficients of β-CaCr2O4 were determined as 2.84(3) × 10–5 K−1, 1.08(1) × 10–5 K−1, 0.79(1) × 10–5 K−1, 0.99(1) × 10–5 K−1 for volume, a-, b- and c axis, respectively. An anisotropic behavior was observed because the axial expansivity for the b axis is smaller than those of the a- and c axis. Combined with available experimental results, the isobaric heat capacity (Cp) of β-CaCr2O4 was evaluated by using a Kieffer’s model with Raman spectroscopy data and compared with previous studies. The isochoric heat capacity (Cv), standard entropy (S0298) and Debye temperature (θD) of β-CaCr2O4 were also determined.

4 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202316
202229
202141
202055
201949
201857