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, the authors reported the oxygen electro-reduction in air-saturated acetonitrile (MeCN) solution supported by 0.1-M tetra-n-butylammonium perchlorate salt under two experimental conditions: (1) anhydrous MeCN at elevated temperatures from 298.5 to 313.0
50 citations
TL;DR: In this article, the effects of methylene and methyl groups to density, dynamic viscosity, and electrical conductivity of air and water stable hydrophobic ionic liquids (ILs) were discussed.
49 citations
TL;DR: In this article, the association of acid orange 7 and cetylpyridinium chloride (S) was studied at 15, 25, 35 and 45°C in the presence of 0, 0.05 and 0.1 mol/kg NaCl, by potentiometric titration, using a surfactant cation sensitive membrane electrode.
49 citations
TL;DR: In this article, a review of the properties of ordered ferromagnetic intermetallic compounds in the iron-nickel system is presented, including tetrataenite, FeNi, and awaruite.
Abstract: There are two well-known ordered ferromagnetic intermetallic compounds in the iron-nickel system: tetrataenite, FeNi, and awaruite, FeNi3. Their thermodynamic properties are established from the various stable and metastable equilibria in which they are involved, and a review to make this data accessible is appropriate. The Fe-Ni phase diagram shows a paramagnetic face-centered cubic phase (gamma) with well-measured properties over the entire composition range from 1184 to 1662 K. Its properties can be extrapolated to lower temperatures, and known stable and metastable equilibria are used to establish models for the thermodynamic properties of the ferromagnetic alpha phase, a high-temperature paramagnetic alpha phase, a paramagnetic gamma-ordered Fe3Ni phase, the ferromagnetic disordered gamma phase, and both ordered ferromagnetic gamma phases, tetrataenite, FeNi, and awaruite, FeNi3. The overestimate of Chuang et al. for the entropy of ordering in awaruite is corrected. The standard enthalpies at 298.15 K of tetrataenite (0.5 FeNi) and awaruite (0.25 FeNi3) are −1170 and −3560±1000 J mol−1. The corresponding standard entropy values are 35.7 and 33.3±3 J mol−1 K−1. All the second-order transitions are accurately modeled and the full phase diagram is calculated. The spinodal regions and metastable equilibria responsible for the complex behavior on cooling of alloys with mole fractions of nickel between 0.26 and 0.40 are described in detail.
49 citations
TL;DR: Excess Gibbs energies indicate the spontaneity and the stability of the mixed micelles and the negative values of standard Gibbs energy change indicate spontaneous micellization and synergism.
49 citations