Particle size effects on the coherent phase equilibria of binary nanoparticles

Joo Youl Huh, Heon Lee, William C. Johnson

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The phase stability of isolated, radially symmetric nanoparticles of a binary system that exhibits a miscibility gap was analyzed by constructing coherent phase diagrams which account for both the surface stress (T s) and the second-order compositional dependence of the lattice parameter (η)cc). Although the elastic stress field in a two-phase coherent particle with a concentric core-shell structure is heterogeneous and nonhydrostatic at equilibrium, the appropriate free energy extremized for equilibrium could be expressed as a function solely of the temperature (θ), composition (c), and effective pressure (P), which are homogeneous in each phase at equilibrium. The construction of coherent phase diagrams in the three-dimensional θ-c-P space showed that the miscibility gap can be either extended or reduced by decreasing the particle radius, depending on the sign of Tsηcc and that the tie-lines lie in the c-P plane.

Original languageEnglish
Pages (from-to)357-363
Number of pages7
JournalMetals and Materials International
Volume11
Issue number5
Publication statusPublished - 2005 Oct 1

Fingerprint

Phase equilibria
Phase diagrams
miscibility gap
Solubility
Particle size
Nanoparticles
nanoparticles
Phase stability
phase diagrams
Free energy
Lattice constants
stress distribution
lattice parameters
Chemical analysis
free energy
radii
Temperature
temperature

Keywords

  • Coherent phase diagram
  • Compositional strain
  • Miscibility gap
  • Nanoparticle
  • Surface stress

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Particle size effects on the coherent phase equilibria of binary nanoparticles. / Huh, Joo Youl; Lee, Heon; Johnson, William C.

In: Metals and Materials International, Vol. 11, No. 5, 01.10.2005, p. 357-363.

Research output: Contribution to journalArticle

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