On the stability of chemical order in small ordered-alloy particles

H. Numakura, T. Ichitsubo

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The reduction in the chemical order of small particles of long-range ordered alloys has recently been discussed by Fukami and Tanaka (Phil. Mag. Lett. 84 33 (2004)) in the framework of the Bragg-Williams model, in apparent accordance with experiment. We re-examine the discussion in the same framework with a closer inspection of the quantitative details. While it reproduces fairly well the lowering of the order-disorder transition temperature of Cu 3Au particles of about 10 nm in size, the model is unable to explain the extended stability of the disordered state observed for smaller particles at room temperature; the order-disorder transition temperature does not fall below half of the transition temperature of bulk materials.

Original languageEnglish
Pages (from-to)855-865
Number of pages11
JournalPhilosophical Magazine
Issue number8
Publication statusPublished - 2005 Mar 11

ASJC Scopus subject areas

  • Condensed Matter Physics


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