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Negative entropy of mixing for vanadium-platinum solutions.

Publication ,  Journal Article
Delaire, O; Swan-Wood, T; Fultz, B
Published in: Physical review letters
October 2004

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. This negative total entropy of mixing should extend to lower concentrations of Pt, and the effect on the bcc solvus line is discussed. The experimental data were inverted to obtain interatomic force constants by using a Born-von Kármán model with an iterative optimization algorithm. The stiffening of bonds responsible for the decrease of entropy was found to occur mainly in first-nearest-neighbor solute-host bonds, and correlates in part with the solute metallic radius.

Duke Scholars

Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

October 2004

Volume

93

Issue

18

Start / End Page

185704

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

Citation

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Delaire, O., Swan-Wood, T., & Fultz, B. (2004). Negative entropy of mixing for vanadium-platinum solutions. Physical Review Letters, 93(18), 185704. https://doi.org/10.1103/physrevlett.93.185704
Delaire, O., T. Swan-Wood, and B. Fultz. “Negative entropy of mixing for vanadium-platinum solutions.Physical Review Letters 93, no. 18 (October 2004): 185704. https://doi.org/10.1103/physrevlett.93.185704.
Delaire O, Swan-Wood T, Fultz B. Negative entropy of mixing for vanadium-platinum solutions. Physical review letters. 2004 Oct;93(18):185704.
Delaire, O., et al. “Negative entropy of mixing for vanadium-platinum solutions.Physical Review Letters, vol. 93, no. 18, Oct. 2004, p. 185704. Epmc, doi:10.1103/physrevlett.93.185704.
Delaire O, Swan-Wood T, Fultz B. Negative entropy of mixing for vanadium-platinum solutions. Physical review letters. 2004 Oct;93(18):185704.

Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

October 2004

Volume

93

Issue

18

Start / End Page

185704

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences