Short- and medium-range order in a Zr73Pt27 glass: Experimental and simulation studies

TitleShort- and medium-range order in a Zr73Pt27 glass: Experimental and simulation studies
Publication TypeJournal Article
Year of Publication2008
AuthorsWang SY, Wang CZ, Li MZ, Huang L, Ott RT, Kramer MJ, Sordelet DJ, Ho KM
Journal TitlePhysical Review B
Volume78
Pages184204
Date Published11/01
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000261214800041
KeywordsAMORPHOUS ALLOY, ATOMIC PACKING, LIQUIDS, metallic glasses, molecular-dynamics, PD, phase, QUASI-CRYSTALS, total-energy calculations, wave basis-set
Abstract

The structure of a Zr73Pt27 metallic glass, which forms a Zr5Pt3 (Mn5Si3-type) phase having local atomic clusters with distorted icosahedral coordination during the primary crystallization, has been investigated by means of x-ray diffraction and combining ab initio molecular-dynamics (MD) and reverse Monte Carlo (RMC) simulations. The ab initio MD simulation provides an accurate description of short-range structural and chemical ordering in the glass. A three-dimensional atomistic model of 18 000 atoms for the glass structure has been generated by the RMC method utilizing both the structure factor S(k) from x-ray diffraction experiment and the partial pair-correlation functions from ab initio MD simulation. Honeycutt and Andersen index and Voronoi cell analyses, respectively, were used to characterize the short- and medium-range order in the atomistic structure models generated by ab initio MD and RMC simulations. The ab initio results show that an icosahedral type of short- range order is predominant in the glass state. Furthermore, analysis of the atomic model from the constrained RMC simulations reveals that the icosahedral-like clusters are packed in arrangements having higher-order correlations, thus establishing medium-range topological order up to two or three cluster shells.

DOI10.1103/PhysRevB.78.184204
Alternate JournalPhys. Rev. B