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N E Sluchanko - One of the best experts on this subject based on the ideXlab platform.

  • the lower Symmetry electron density distribution and the charge transport anisotropy in Cubic dodecaboride lub12
    Journal of Physics: Condensed Matter, 2018
    Co-Authors: N B Bolotina, A P Dudka, Olga N Khrykina, V N Krasnorussky, N Shitsevalova, Volodymyr Filipov, N E Sluchanko
    Abstract:

    High-quality single crystals of LuB12 are grown using the induction zone melting method. The x-ray data are collected at temperatures 293, 135, 95, 50 K. The crystal structure of LuB12 can be refined with record low R-factor in the Cubic Fm [Formula: see text] m Symmetry group despite reiterated observations of the Cubic Symmetry distortions both in the unit-cell values and in the physical properties. A peculiar computing strategy is developed to resolve this contradiction. True Symmetry of the electron-density distribution in LuB12 is proved to be much lower than Cubic as a result, which correlates very accurately with anisotropy of transport properties of LuB12.

  • the lower Symmetry electron density distribution and the charge transport anisotropy in Cubic dodecaboride lub12
    arXiv: Strongly Correlated Electrons, 2018
    Co-Authors: N B Bolotina, A P Dudka, Olga N Khrykina, V N Krasnorussky, N Shitsevalova, Volodymyr Filipov, N E Sluchanko
    Abstract:

    High-quality single crystals of LuB12 are grown using the induction zone melting method. The X-ray data are collected at temperatures 293, 135, 95, 50 K. The crystal structure of LuB12 can be refined with record low R-factor in the Cubic Fm-3m Symmetry group despite reiterated observations of the Cubic Symmetry distortions both in the unit-cell values and in the physical properties. A peculiar computing strategy is developed to resolve this contradiction. True Symmetry of the electron-density distribution in LuB12 is proved to be much lower than Cubic as a result, which correlates very accurately with anisotropy of transport properties of LuB12.

Swantje Bargmann - One of the best experts on this subject based on the ideXlab platform.

  • tunable auxeticity and isotropic negative thermal expansion in three dimensional lattice structures of Cubic Symmetry
    Extreme Mechanics Letters, 2021
    Co-Authors: Xianglong Peng, Swantje Bargmann
    Abstract:

    Abstract A class of three-dimensional lattice structures of Cubic Symmetry is designed by spatially assembling and merging a number of two-dimensional re-entrant honeycomb structures. We demonstrate that the effective thermoelastic properties of these structures are widely tunable by tailoring the microstructural geometry and/or constituent materials. Particularly, they possess negative effective Poisson ’ s ratios. If the inclined and non-inclined walls are of dissimilar thermal expansion coefficients, they can further attain isotropic negative or positive effective thermal expansion coefficients with a magnitude as large as several to dozens of times that of the constituent materials. Owing to these novel properties, they are well suitable as structural or functional components in engineering systems for preventing or harnessing thermal and/or mechanical deformation.

Randall D Kamien - One of the best experts on this subject based on the ideXlab platform.

  • smectic phases with Cubic Symmetry the splay analog of the blue phase
    Physical Review Letters, 2002
    Co-Authors: Brian Didonna, Randall D Kamien
    Abstract:

    We report on a construction for smectic blue phases, which have quasi-long-range smectic translational order as well as long-range Cubic or hexagonal order. Our proposed structures fill space with a combination of minimal surface patches and cylindrical tubes. We find that for the right range of material parameters, the favorable saddle-splay energy of these structures can stabilize them against uniform layered structures.

Paul Heitjans - One of the best experts on this subject based on the ideXlab platform.

  • Symmetry reduction due to gallium substitution in the garnet li6 43 2 ga0 52 3 la2 67 4 zr2o12
    ChemInform, 2016
    Co-Authors: Lars Robben, Paul Heitjans, Elena Merzlyakova, Thorsten M Gesing
    Abstract:

    Single-crystal structure refinements on lithium lanthanum zirconate (LLZO; Li7La3Zr2O12) substituted with gallium were successfully carried out in the Cubic Symmetry space group I\overline{4}3d. Gallium was found on two lithium sites as well as on the lanthanum position. Due to the structural distortion of the resulting Li6.43(2)Ga0.52(3)La2.67(4)Zr2O12 (Ga–LLZO) single crystals, a reduction of the LLZO Cubic garnet Symmetry from Ia\overline{3}d to I\overline{4}3d was necessary, which could hardly be analysed from X-ray powder diffraction data.

  • mechanosynthesis of solid electrolytes preparation characterization and li ion transport properties of garnet type al doped li7la3zr2o12 crystallizing with Cubic Symmetry
    Journal of Physical Chemistry C, 2012
    Co-Authors: Andre Duvel, Alexander Kuhn, Lars Robben, Martin Wilkening, Paul Heitjans
    Abstract:

    Various polycrystalline samples of Al-doped garnet-like Li7La3Zr2O12 crystallizing with Cubic Symmetry were synthesized from the binary oxides Li2O, ZrO2, Al2O3, and La2O3. The synthesis of phase pure samples was carried out following a two-step preparation route. It consists of an activation step by high-energy ball milling and a subsequent annealing step at elevated temperatures. The synthesis route chosen allows the precise adjustment of the cationic ratios, leading to a garnet which is best described by the formula Li7–3x+zAlx+y+zLa3–yZr2–zO12. As confirmed by X-ray powder diffraction and 27Al magic angle spinning nuclear magnetic resonance (NMR), at low Al concentrations the incorporated Al3+ ions act as an aliovalent dopant by replacing three Li+ ions. However, with increasing Al content, La3+ and Zr4+ ions are progressively replaced by Al ions. It turned out that, in particular, the substitution of La3+ and Zr4+ with Al3+ ions stabilizes the Cubic modification of the garnet and greatly affects the ...

Colin Bonatti - One of the best experts on this subject based on the ideXlab platform.

  • smooth shell metamaterials of Cubic Symmetry anisotropic elasticity yield strength and specific energy absorption
    Acta Materialia, 2019
    Co-Authors: Colin Bonatti, Dirk Mohr
    Abstract:

    Abstract Shell-lattices consist of a single, periodic, non-intersecting shell of uniform wall thickness that separates two intertwined void phases. To obtain a comprehensive overview on their small and large strain response, three families of shell-lattices are derived from Simple-Cubic (SC), Face-Centered Cubic (FCC) and Body-Centered Cubic (BCC) tube-lattices using a parameterized surface-smoothening functional. Each family's central element is an approximation of a Triply Periodic Minimal Surface (TPMS). Detailed finite element simulations are carried out for more than 800 shell-lattices covering relative densities ranging from 1% to 80%. It is found that the TMPS-like structures exhibit highly anisotropic elastic and plastic properties that depend on the type of Cubic Symmetry. However, when averaging the mechanical properties over all possible directions of loading, the performance of the SC, FCC and BCC shell-lattices turns out to be similar, with all structures providing substantially higher stiffness and strength than optimal truss-lattices of equal mass. They also exhibit high specific energy absorption for large strain compression. It is found that the macroscopic deformation mode changes from foam-like crushing (for relative densities below 10%) to bulk-like positive strain hardening (for relative densities above 20%). The spectrum of anisotropic structures obtained through varying the bias parameter of the surface-defining functional also includes elastically-isotropic shell-lattices. The Young's modulus of the isotropic shell-lattices of FCC and BCC Symmetry is slightly higher than the average modulus of their TPMS-like counterparts, while the opposite holds true for SC structures. Compression experiments are performed on additively-manufactured stainless steel 316L specimens to validate the conclusions drawn from numerical simulations.