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Negative Entropy of Mixing for Vanadium-Platinum

2019-5-11  Negative Entropy of Mixing for Vanadium-Platinum Solutions O. Delaire, T. Swan–Wood, and B. Fultz California Institute of Technology, W. M. Keck Laboratory, mail 138-78, Pasadena, California 91125, USA (Received 9 April 2004; published 29 October 2004) The phonon densities of states for pure vanadium and the solid solutions V-6.25% Ni, Pd, Pt

Negative Entropy of Mixing for Vanadium-Platinum

The phonon densities of states for pure vanadium and the solid solutions V-6.25% Ni, Pd, Pt were determined from inelastic neutron scattering measurements. The solute atoms caused a large stiffening of the phonons, resulting in large, negative vibrational entropies of mixing. For V-6.25%Pt, the negative vibrational entropy of mixing exceeds the conventional positive chemical entropy of mixing.

(PDF) Negative Entropy of Mixing for Vanadium

Negative Entropy of Mixing for Vanadium-Platinum Solutions Article (PDF Available) in Physical Review Letters 93(18):185704 · November 2004 with 52 Reads How we measure 'reads'

Negative Entropy of Mixing for Vanadium-Platinum

2004-10-1  The phonon densities of states for pure vanadium and the solid solutions V-6.25% Ni, Pd, Pt were determined from inelastic neutron scattering measurements. The solute atoms caused a large stiffening of the phonons, resulting in large, negative vibrational entropies of mixing. For V-6.25%Pt, the negative vibrational entropy of mixing exceeds the conventional positive chemical entropy of mixing.

(PDF) Negative Entropy of Mixing for Vanadium

Negative Entropy of Mixing for Vanadium-Platinum Solutions

Negative entropy of mixing for vanadium-platinum

2021-1-8  Title: Negative entropy of mixing for vanadium-platinum solutions. Publication Type: Journal Article: Authors: O Delaire, T Swan-Wood, and B Fultz

Negative Entropy of Mixing for Vanadium-Platinum

Negative Entropy of Mixing for Vanadium-Platinum Solutions By O. Delaire, T. Swan–Wood and B. Fultz Get PDF (0 MB)

Negative Entropy of Mixing for Vanadium-Platinum

Información del artículo Negative Entropy of Mixing for Vanadium-Platinum Solutions

Vibrational thermodynamics of vanadium and dilute

2021-1-16  For V-6.25%Pt, the negative vibrational entropy of mixing at 293 K exceeds the conventional positive chemical entropy of mixing. At elevated temperatures, the vanadium phonon DOS shows a pronounced anharmonic behavior, with minimal softening occurring up to 1273 K. On the other hand, the alloy V-7%Co showed the more expected trend of softening

Why is entropy of mixing not zero for ideal solutions?

Theoretically speaking, entropy should increase while mixing two ideal mixtures (from Second law of Thermodynamics). But when mixing happens at constant pressure, (deltaH) =(delta Q) and thus

Vibrational thermodynamics of vanadium and dilute

2021-1-16  For V-6.25%Pt, the negative vibrational entropy of mixing at 293 K exceeds the conventional positive chemical entropy of mixing. At elevated temperatures, the vanadium phonon DOS shows a pronounced anharmonic behavior, with minimal softening occurring up to 1273 K. On the other hand, the alloy V-7%Co showed the more expected trend of softening

Physical Review Letters Volume 93 Issue 18

Negative Entropy of Mixing for Vanadium-Platinum Solutions O. Delaire, T. Swan–Wood, and B. Fultz Phys. Rev. Lett. 93,185704 (2004) Published 29 October 2004

VANADIUM chemguide

2015-6-18  Vanadium has oxidation states in its compounds of +5, +4, +3 and +2. This section looks at ways of changing between them. It starts with a bit of description, and then goes on to look at the reactions in terms of standard redox potentials (standard electrode potentials). Observing the changes in the lab. Reducing vanadium(V) in stages to

Thesis by Olivier Delaire CiteSeerX

gain in configurational entropy. This result is the first reported observation of a negative to-tal entropy of mixing in a binary alloy. Chemical trends in the phonon DOS and vibrational entropy of dilute vanadium alloys were investigated, for impurity elements across the 3d, 4d and 5d-series. A previously unknown correlation is established

Thermodynamic properties in the systems vanadium

2020-12-1  Permeation and diffusion of hydrogen in vanadium using deoxidation and glow-discharge surface cleaning techniques. Vanadium Hydride as Conversion Type Negative Electrode for All-Solid-State Lithium-Ion-Battery. Towards the Development of a Universal Expression for the Configurational Entropy of Mixing. Entropy 2016, 18 (1

Entropy matters in grain boundary segregation

A fitting of the temperature dependence of phosphorus segregation at the special {013} grain boundary in α-iron for bulk concentration of phosphorus X P = 0.00089 displayed in Fig. 1b also shows the effect of neglecting the entropy term. Using Eqs. (5) and and neglecting the term ΔG P E in Eq. (6), the optimum fit to the experimental data results in ΔH P 0 = –14.7 kJ mol –1 and ΔS P 0

Recent progresses on physics and applications of

2018-10-1  As a strongly correlated electron material, vanadium dioxide (VO 2) has been a focus of research since its discovery in 1959, owing to its well-known metal–insulator transition coupled with a structural phase transition.Recent years have witnessed both exciting discoveries in our understanding of the physics of VO 2 and developments in new applications of VO 2-related materials.

Effect of electron count and chemical complexity in

High-entropy alloys are a new class of materials that consist of several principal elements arranged on simple lattices. These structures are stabilized by the high configurational entropy of the random mixing of the elements. Here, we show that the properties of a superconducting high-entropy alloy are strongly related to the electron count and that the superconducting transition temperatures

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Standard Thermodynamic Values

2013-1-31  34 Formula State of Matter Enthalpy (kJ/mol) Entropy (J mol/K) Gibbs Free Energy (kJ/mol) Ba 2TiO 4 (s) -2243.0424 196.648 -2133.0032 BaBr 2 (s) -757.304 146.44 -736.8024 BaBr 2 (g) -439.32 330.536 -472.792 BaBr 2•2H 2O (s) -1366.076 225.936 -1230.5144 BaCl 2 (s) -858.1384 123.67904 -810.4408 BaCl 2 (l) -832.44864 143.5112 -790.1484 BaCl 2 (g) -498.7328 325.64072 -510.69904

Physical Review Letters Volume 93 Issue 18

Negative Entropy of Mixing for Vanadium-Platinum Solutions O. Delaire, T. Swan–Wood, and B. Fultz Phys. Rev. Lett. 93,185704 (2004) Published 29 October 2004

VANADIUM chemguide

2015-6-18  Vanadium has oxidation states in its compounds of +5, +4, +3 and +2. This section looks at ways of changing between them. It starts with a bit of description, and then goes on to look at the reactions in terms of standard redox potentials (standard electrode potentials). Observing the changes in the lab. Reducing vanadium(V) in stages to

Thermodynamic properties in the systems vanadium

2020-12-1  Permeation and diffusion of hydrogen in vanadium using deoxidation and glow-discharge surface cleaning techniques. Vanadium Hydride as Conversion Type Negative Electrode for All-Solid-State Lithium-Ion-Battery. Towards the Development of a Universal Expression for the Configurational Entropy of Mixing. Entropy 2016, 18 (1

Thesis by Olivier Delaire CiteSeerX

gain in configurational entropy. This result is the first reported observation of a negative to-tal entropy of mixing in a binary alloy. Chemical trends in the phonon DOS and vibrational entropy of dilute vanadium alloys were investigated, for impurity elements across the 3d, 4d and 5d-series. A previously unknown correlation is established

Older Fultz Group Abstracts

The vibrational entropies of mixing 6.25% substitutional solutes into vanadium were, for Ni, Pd and Pt solutes, -0.082, -0.185 and -0.272 k_B/atom, respectively. For V-6.25% Pt, the negative vibrational entropy of mixing exceeds the conventional positive chemical entropy of mixing.

Vanadium Hydride as Conversion Type Negative

Vanadium Hydride as Conversion Type Negative Electrode for All-Solid-State Lithium-Ion-Battery Yasuhiro Matsumura1, +1, Keiji Takagishi 2, Hiroki Miyaoka3 and Takayuki Ichikawa1,3,4, 1Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan 2Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739

The structure and properties of high-entropy alloys

2014-11-28  A disordered solution whose entropy of mixing fully compensates the influence of both positive and negative enthalpy can form only for particular elemental compositions. 67, 68, 74 Taking into account this fact, the notion 'high-entropy alloy' includes not only the influence of the high entropy of mixing, but also the ability to form disordered

Guidelines in predicting phase formation of high

With multiple elements mixed at equal or near-equal molar ratios, the emerging, high-entropy alloys (HEAs), also named multi-principal elements alloys (MEAs), have posed tremendous challenges to materials scientists and physicists, e.g., how to predict high-entropy phase formation and design alloys. In this paper, we propose some guidelines in predicting phase formation, using thermodynamic

合金元素对CoCrFeNi基高熵合金相组成和力学性能影响的

合金元素对CoCrFeNi基高熵合金相组成和力学性能影响的研究现状 孙娅 1, 吴长军 1, 刘亚 1, 彭浩平 1, 苏旭平 1,2 1 常州大学江苏省材料表面科学与技术重点实验室,常州 213164 2 常州大学江苏省光伏科学与工程协同创新中心,常州 213164 Impact of Alloying

Standard Thermodynamic Values

2013-1-31  34 Formula State of Matter Enthalpy (kJ/mol) Entropy (J mol/K) Gibbs Free Energy (kJ/mol) Ba 2TiO 4 (s) -2243.0424 196.648 -2133.0032 BaBr 2 (s) -757.304 146.44 -736.8024 BaBr 2 (g) -439.32 330.536 -472.792 BaBr 2•2H 2O (s) -1366.076 225.936 -1230.5144 BaCl 2 (s) -858.1384 123.67904 -810.4408 BaCl 2 (l) -832.44864 143.5112 -790.1484 BaCl 2 (g) -498.7328 325.64072 -510.69904