Controlled assembly of graphene-capped nickel, cobalt and iron silicides

In-situ dendrite/metallic glass matrix composites (MGMCs) with a composition of Ti46Zr20V12Cu5Be17 exhibit ultimate tensile strength of 1510 MPa and fracture strain of about 7.6%. A tensile deformation model is established, based on the five-stage classification: (1) elastic-elastic, (2) elastic-plastic, (3) plastic-plastic (yield platform), (4) plastic-plastic (work hardening), and (5) plastic-plastic (softening) stages, analogous to the tensile behavior of common carbon steels. The constitutive relations strongly elucidate the tensile deformation mechanism. In parallel, the simulation results by a finite-element method (FEM) are in good agreement with the experimental findings and theoretical calculations. The present study gives a mathematical model to clarify the work-hardening behavior of dendrites and softening of the amorphous matrix. Furthermore, the model can be employed to simulate the tensile behavior of in-situ dendrite/MGMCs

Structural and electronic properties of graphene based junctions for spin filtering The graphene Al Ni 111 intercalation like system

The atomic and electronic structure of the graphene/Al/Ni(1 1 1) system is studied via combination of LEED and spectroscopic methods (X-ray absorption, core-level and valence-band photoelectron spectroscopy), respectively. These data demonstrating the (2 × 2) overstructure and the decoupling of the graphene layer from the substrate (with respect to graphene/Ni(1 1 1)) are in very good agreement with DFT calculations supporting nearly free-standing state of graphene in this system (with small n-doping). The perspectives of application of Al-based intercalation-like systems are discussed

Features of metal atom 2p excitations and electronic structure of 3d metal phthalocyanines studied by X ray absorption and resonant photoemission

The metal atom 2p core excitations in 3d metal phthalocyanines MPc s, M Ni, Co, Fe have been studied via a combination of near edge X ray absorption fine structure NEXAFS and resonant photoemission ResPE spectroscopy. On the basis of comparison of the corresponding spectra of NiPc, CoPc and FePc it has been shown that the presence of a partly filled molecular orbital MO dramatically affects the formation and decay processes of the M 2p core excitation in CoPc and, to a greater extend, in FePc due to the significant 3d 3d exchange interaction. It has been found that the low lying unoccupied electronic states of NiPc, CoPc and FePc are strongly localized within the MN4 quasi molecule and have nearly pure 3d character. Moreover, mainly 3d metallic character of the high lying occupied MOs of NiPc, CoPc and FePc has been prove

Controlled assembly of graphene capped nickel, cobalt and iron silicides

In-situ dendrite/metallic glass matrix composites (MGMCs) with a composition of Ti46Zr20V12Cu5Be17 exhibit ultimate tensile strength of 1510 MPa and fracture strain of about 7.6%. A tensile deformation model is established, based on the five-stage classification: (1) elastic-elastic, (2) elastic-plastic, (3) plastic-plastic (yield platform), (4) plastic-plastic (work hardening), and (5) plastic-plastic (softening) stages, analogous to the tensile behavior of common carbon steels. The constitutive relations strongly elucidate the tensile deformation mechanism. In parallel, the simulation results by a finite-element method (FEM) are in good agreement with the experimental findings and theoretical calculations. The present study gives a mathematical model to clarify the work-hardening behavior of dendrites and softening of the amorphous matrix. Furthermore, the model can be employed to simulate the tensile behavior of in-situ dendrite/MGMCs