Materials Literature
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Qualitative comparison of the effect of ultrasonic treatment and annealing on the structural relaxation of a two-dimensional nanocrystalline material after severe plastic deformation has been performed by the molecular-dynamics method. The treatments of both types lead to a decrease in the dislocation density and to a…
The crystal structure of lead and indium nanoparticles produced by the introduction of lead and indium into porous glasses with an average pore diameter of 7 nm at a high pressure is studied by X-ray diffraction. In contrast to the lead nanoparticles, the indium nanoparticles exhibit pronounced anomalous asymmetry of…
The paper presents the scientific basis and technical implementation of a method for obtaining oxygen by extraction from air using an electrochemical cell based on a solid oxide cell (SOC) with anion-conducting solid electrolyte. A nanopowder of a weak aggregate of the YSZ solid electrolyte and LSM fine powder was use…
We demonstrate that an interlinked gold half-shell array fabricated by metal deposition on a sacrificial two-dimensional colloidal crystal template can show a large enhancement in surface-enhanced Raman spectroscopy at its main transmission resonance. It is further observed that Raman signal enhancement shows a notice…
We present an overview of recent experiments performed on water in the deeply supercooled region, a temperature region of fundamental importance in the science of water. We examine data generated by nuclear magnetic resonance; quasi-elastic neutron scattering, Fourier-transform infrared spectroscopy, and Raman spectro…
LCAE-URAC18, Faculte des Sciences, Universite Mohammed Premier, B.P. 4808, Oujda, Morocco LCOMPN-URAC25, Faculte des Sciences, Universite Mohammed Premier, Oujda, Morocco Laboratoire des Procedes de Separation, Faculte des Sciences, Universite Ibn Tofail, Kenitra, Morocco Laboratoire d’Analyse et Caracterisation des M…
δ-Al(OD) 3 powders were synthesized from Al(OD) 3 bayerite at 4 GPa and 523 K using a cubic press apparatus. Neutron powder diffraction analyses of δ-Al(OD) 3 at ambient conditions revealed that the crystals are orthorhombic with space group P2 1 2 1 2 1 , not Pnma as reported previously based on X-ray diffraction dat…
A critical analysis of available thermodynamic data for the Fe-V-Nb-C-N system has been performed. Based on the CALPHAD method, a self-consistent thermodynamic description of this system has been suggested. Using the constructed thermodynamic description, calculations of phase equilibria of the system under considerat…
Article Deformation behaviour of freestanding single-crystalline Ni3Al-based nanoparticles was published on May 1, 2011 in the journal International Journal of Materials Research (volume 102, issue 5).
Accelerated aging tests for induction motors with class E electrical insulation were conducted. The testing period exceeded one year and involved elevated temperatures, vibration, humidity, and voltage application. The activation energy of the aging process was estimated to be 0.72 ± 0.08 eV.
By doping a nematic phase with a chiral molecule one obtains a cholesteric phase. Each chiral molecule is characterised by its helical twisting power (HTP) which is defined as HTP = q/(2πC) where q is the equilibrium pitch of the cholesteric phase and C the concentration (in wt%) of chiral molecules. In a similar way,…
The effect of isolated vacancies on the elastic properties of a graphene sheet has been investigated by the ab initio density functional method. An almost inverse linear dependence of the Young’s modulus on the concentration of vacancies has been revealed. The height of potential barriers for the motion of vacancies i…
Possible types of spatially modulated periodic antiferromagnetic structures in a uniaxial rhombohedral multiferroic with BiFeO 3 crystal symmetry have been studied depending on the ratio of the uniaxial anisotropy and magnetoelectric interaction parameters. It has been shown that, along with symmetric cycloid antiferr…
Most widely occurring classes of carbon nanoparticles used to create polymeric composite systems are considered. The possibility is demonstrated of using “polymer-carbon nanoparticles” composites for raising the level of mechanical properties of polymeric materials, creating friction units with improved tribological c…
We propose and demonstrate experimentally a novel type of nonlinearity in metamaterials, which is induced by mechanical deformation of the structure. The nonlinearity arises from the introduction of an extra degree of freedom in the metamaterial, which allows for elastic displacement of the strongly interacting struct…
A review of the evolution of modeling for accurate dimensional scanning electron microscopy is presented with an emphasis on developments in the Monte Carlo technique for modeling the generation of the electrons used for imaging and measurement. The progress of modeling for accurate metrology is discussed through a sc…
The high-temperature glass-matrix and ceramic-matrix composites developed by the RIAM are overviewed. The distinctive properties of the developed composites are their high stability at temperatures above 1200°C in an oxidizing medium, high endurance and corrosion resistance, and low density and thermal expansion. Ther…
We investigate the transport characteristics of monolayer graphene p-n junctions by means of the nonequilibrium Green’s function technique. It is shown that due to the high interband tunneling of chiral fermions and a finite bandgap opening when the inversion symmetry of the graphene plane is broken, a strong negative…
Design and modeling of a bi-laminate, Galfenol-driven composite beam is presented in which the elasticity of the adhesive layer is considered. The optimal thickness ratio necessary to maximize the tip deflection is found by minimization of the internal energy of the beam. Model simulations show that use of a substrate…
In this work, injection moulding and pressureless sintering in hydrogen were applied to manufacture translucent alumina ceramics. Excellent rheological properties of the feedstocks for injection moulding were obtained through a method of powder pretreatment with stearic acid induced by ball milling. Optimum solid load…