Structural model for octagonal quasicrystals derived from octagonal symmetry elements arising in beta-Mn crystallization of a simple monatomic liquid
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 79, no 14, 144201- p.Article in journal (Refereed) Published
While performing molecular-dynamics simulations of a simple monatomic liquid, we observed the crystallization of a material displaying octagonal symmetry in its simulated diffraction pattern. Inspection of the atomic arrangements in the crystallization product reveals large grains of the beta-Mn structure aligned along a common fourfold axis, with 45 degrees rotations between neighboring grains. These 45 degrees rotations can be traced to the intercession of a second crystalline structure fused epitaxially to the beta-Mn domain surfaces, whose primitive cell has lattice parameters a=b=c=a(beta-Mn), alpha=beta=90 degrees, and gamma=45 degrees. This secondary phase adopts a structure which appears to have no known counterpart in the experimental literature, but can be simply derived from the Cr3Si and Al3Zr4 structure types. We used these observations as the basis for an atomistic structural model for octagonal quasicrystals, in which the beta-Mn and the secondary phase structure unit cells serve as square and rhombic tiles (in projection), respectively. Its diffraction pattern down the octagonal axis resembles those experimentally measured. The model is unique in being consistent with high-resolution electron microscopy images showing square and rhombic units with edge-lengths equal to that of the beta-Mn unit cell. Energy minimization of this configuration, using the same pair potential as above, results in an alternative octagonal quasiperiodic structure with the same tiling but a different atomic decoration and diffraction pattern.
Place, publisher, year, edition, pages
2009. Vol. 79, no 14, 144201- p.
crystallisation, electron microscopy, liquid metals, liquid structure, liquid theory, manganese, molecular dynamics method
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:kth:diva-32182DOI: 10.1103/PhysRevB.79.144201ISI: 000265943200050ScopusID: 2-s2.0-65549130873OAI: oai:DiVA.org:kth-32182DiVA: diva2:409471
QC 201104082011-04-082011-04-082011-04-08Bibliographically approved