A Distinctive Feature of the Surface Structure of Quasicrystals: Intrinsic and Extrinsic Heterogeneity

Abstract

Ames Laboratory-USDOE. His research primarily involves non-equilibrium statistical mechanics and multiscale modeling, especially the development of realistic atomistic-level models for surface phenomena. One focus area is the formation and stability of epitaxial metal nanostructures. Another is analysis of catalytic reaction processes both on metal surfaces and in mesoporous materials. Marianne Quiquandon obtained her Master's degree in Materials Science in 1981 at the University Pierre et Marie Curie in Paris. She joined the CNRS in the Laboratory Centre d'Etude de Chimie MØtallurgique (CECM/CNRS at Vitry near Paris) directed by Prof. M. Fayard. She obtained her Ph.D. in 1988 on the dynamical theory of fast electrons in crystals and quasicrystals. She performed the first dynamical calculations of high-resolution images simulations and characterizations of defects in these materials, such as antiphase domains and dislocations. She specialized in quasicrystal structure determination studies using the high dimension space description, in close collaboration with D. Gratias and A. Katz, and extended the method to approximants in identifying those structures in the (AlCuFe) ternary phase diagram. More recently, she proposed a unified 6D structural description for the two prototypic F-icosahedral phases AlCuFe and AlPdMn.

Probing the growth and melting pathways of a decagonal quasicrystal in real-time

“…The relatively low value (i.e., α < 2) indicates that the QC interfaces are atomically rough, similar to other solid metals grown from the liquid phase, e.g., Al and Ni 46 . Further support comes from a number of scanning tunneling microscopy (STM) studies by Thiel and coworkers 55 – 57 that depict the complex surface structures of these aperiodic interfaces: For instance, the atomically-clean, five-fold facets of an icosahedral quasicrystal exhibit a terrace-step morphology, wherein the terraces are separated by steps of unequal heights. Moreover, icosahedral quasicrystals present multiple types of adsorption sites (e.g., “dark stars” and “white flowers”) 56 due to the diverse range of atomic configurations.…”

The role of three-dimensional bulk clusters in determining surface morphologies of intermetallic compounds: Quasicrystals to clathrates

“…2(b)]. [63][64][65][66][67] However, atomically flat terraces are separated by steps of unequal heights. The two smallest heights are related by the golden number, which is an irrational number.…”

Protection of AA2024 alloy against wear and corrosion by HVAF sprayed AlCuFe coating

“…Recently, materials with a quasicrystalline (QC) atomic structure are shown to possess several unique properties [9]. Resembling the high mechanical properties of the aforementioned coatings, the QC coatings, additionally possess superior 'thermal barrier' properties that can ensure beneficial industrial applications [9][10][11][12][13][14][15]. Thus, the QC materials seem to be good candidates for surface protection of the aluminium-made pistons in internal combustion engines.…”