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Structure of face-centred icosahedral quasicrystals with cluster close packing.
Acta Crystallogr A Found Adv
November 2024
National Institute for Materials Science, Tsukuba, Ibaraki, 305, Japan.
A 6D structure model for face-centred icosahedral quasicrystals consisting of so-called pseudo-Mackay and mini-Bergman-type atomic clusters is proposed based on the structure model of the AlPdCrFe 3/2 cubic approximant crystal (with space group Pa3, a = 40.5 Å) [Fujita et al. (2013).
View Article and Find Full Text PDFHigh-Temperature Atomic Diffusion and Specific Heat in Quasicrystals.
Phys Rev Lett
May 2024
CCSE, Japan Atomic Energy Agency, 178-4-4 Wakashiba, Kashiwa, Chiba 277-0871, Japan.
A quasicrystal is an ordered but nonperiodic structure understood as a projection from a higher-dimensional periodic structure. Some physical properties of quasicrystals are different from those of conventional solids. An anomalous increase in heat capacity at high temperatures has been discussed for over two decades as a manifestation of a hidden high dimensionality of quasicrystals.
View Article and Find Full Text PDFHeptatic liquid quasi-crystals by colloidal lithographic pre-assembly.
J Colloid Interface Sci
July 2024
Department of Chemistry and Biochemistry, University of California-Los Angeles, Los Angeles, CA 90095, USA; Department of Physics and Astronomy, University of California-Los Angeles, Los Angeles, CA 90095, USA; California NanoSystems Institute, University of California-Los Angeles, Los Angeles, CA 90095, USA. Electronic address:
Hypothesis: We hypothesize that pre-assembled lithographic Brownian seven-fold quasi-crystals (QCs) of colloidal tiles at high densities can exhibit a heptatic liquid quasi-crystal (LQC) phase upon release; such heptatic LQCs can undergo heterogeneous dynamics at different length scales, reflecting the underlying symmetry, corrugation, and hierarchy of local sets of tiles.
Experiments: We design, fabricate, and release a seven-fold QC composed of three differently shaped rhombic tiles using the method of lithographically pre-assembled monolayers (litho-PAMs). High resolution optical microscopy enables spatio-temporal particle tracking of Brownian fluctuations of many tiles in a large area over a long time.
Electrons Surf Phason Waves in Moiré Bilayers.
Nano Lett
June 2023
Departments of Materials and Physics and the Thomas Young Centre for Theory and Simulation of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
We investigate the effect of thermal fluctuations on the atomic and electronic structure of a twisted MoSe/WSe heterobilayer using a combination of classical molecular dynamics and density functional theory calculations. Our calculations reveal that thermally excited phason modes give rise to an almost rigid motion of the moiré lattice. Electrons and holes in low-energy states are localized in specific stacking regions of the moiré unit cell and follow the thermal motion of these regions.
View Article and Find Full Text PDFLarge-scale oxygen order phase transitions and fast ordering kinetics at moderate temperatures in NdNiO electrodes.
Mater Adv
January 2023
ICGM, Univ. Montpellier, CNRS, ENSCM Montpellier France
Non-stoichiometric 214-nickelates with Ruddlesden-Popper (RP) type frameworks emerged as potential candidates for mixed electronic/ionic conductors in the intermediate temperature range. In this work we investigated structural aspects of the oxygen ion mobility diffusion mechanisms in non-stoichiometric NdNiO nickelates by X-ray (laboratory and synchrotron) as well by neutron diffraction. Temperature dependent synchrotron powder diffraction revealed a phase diagram of unprecedented complexity, involving a series of highly organized, 3D modulated phases related to oxygen ordering below 800 K.
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