Materials Literature
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We investigate the process of slow intergranular crack propagation by the finite element method model, and show that branching is induced by partial arresting of crack front owing to the geometrical randomness of grain boundaries. A possible scenario for branching instability of crack propagation in disordered continu…
We investigated the effect of mean-field electron correlations on the band electronic structure of Co, Ni, and Pd ultra-thin monatomic nanowires, at the breaking point, by means of density-functional calculations in the self-interaction corrected LDA approach (LDA+SIC) and alternatively by the LDA+$U$ scheme. We find…
The time decay of the thermo-remanent magnetization (TRM) in Fe-Cr giant magnetoresistive (GMR) multilayers has been investigated. The magnetization in these multilayers relaxes as a function of time after being cooled in a small magnetic field of 100 Oe to a low temperature and then the magnetic field is switched off…
Silicon-based quantum-computer architectures have attracted attention because of their promise for scalability and their potential for synergetically utilizing the available resources associated with the existing Si technology infrastructure. Electronic and nuclear spins of shallow donors (e.g. phosphorus) in Si are i…
This study investigates high-frequency magnetic, dielectric, and microwave absorbing properties of iron particles dispersed in rubber matrix for the aim of thin microwave absorbers in gigahertz frequencies. High value of magnetic permeability and dielectric constant can be obtained in the composites containing thin fl…
Photodeposition of Ag nanoparticles on commercial TiO2 particles and nanoparticles was performed in order to provide direct visualization of the spatial distribution of photoactive sites on sub-micrometer-scale and nanoscale TiO2 particle surfaces and to create materials for potential catalytic applications. HRTEM (hi…
Raman spectra of carbon nanowalls (CNWs) grown using dc plasma-enhanced chemical vapor deposition were analyzed. The Raman spectra of CNWs exhibited G and D bands at ∼1580 and ∼1350cm−1, respectively. It is found that the bandwidth of the G band is relatively narrow, even when the peak intensity ratio of D band to G b…
Numerous technologies including solid-state lighting, displays, and traffic signals can benefit from efficient, color-selectable light sources that are driven electrically. Semiconductor nanocrystals are attractive types of chromophores that combine size-controlled emission colors and high emission efficiencies with e…
From the lecturer R.C. would like to thank the organizer Dr. James Montaldi of the Mechanics and Symmetry Euro Summer School which was held in Peyresq, France in September 2–16, 2000 for inviting him to give several lectures on integrable Hamiltonian systems. R.C. declines to take any credit for the contents of these…
This work presents measurements of the electrical resistivity (ρ), Seebeck coefficient, and thermal conductivity (κ) of icosahedral Al70Pd22.5(Re1−xMnx)7.5 quasicrystals from 10to300K. A series of quasicrystals was prepared with x=0, 0.1, 0.2, 0.3, 0.5, 0.6, 0.8, and 1.0 to systematically study the effect of substitut…
The influence of parent materials on soil properties has long been recognized. Early pedologists and soil geographers based their concepts of soils largely on its presumed parent material. Later, parent material was viewed simply as a factor that influences soil development – an influence that diminishes in importance…
Abstract Secondary plasticizers are additives which, by themselves, have limited compatibility with the polymer but may be used in combination with a primary plasticizer. Within the secondary plasticizers group hydrocarbon (HC) secondary plasticizers are sometimes seen as inexpensive, volatile additives that can reduc…
Density functional theory (DFT) has been applied to study the effect of fluorination on the electronic and excited states of fused zinc oligoporphyrins in the search for new functionalizing materials, such as n-type organic semiconductors. The excitation spectra of meso-tetrafluoro, beta-octafluoro, and perfluoro zinc…
Ferromagnetic V-doped TiO2 and Cr-doped TiO2 films were fabricated by the pulsed laser deposition technique on LaAlO3 substrates. All V∕Cr:TiO2 films are single phased anatase, well epitaxial, c-axis oriented, and strongly ferromagnetic at room temperature. Besides giving evidences for a great flatness and magnetic ho…
In this paper, a method is presented to calculate the deformation of electrical steel due to magnetic forces and magnetostriction by using the finite element method. The magnetostrictive properties of the steel are determined experimentally in a small single-sheet tester with strain gauges fitted on the sheet. This me…
Cornerstone Research Group, Inc. (CRG) has recently demonstrated the feasibility of filament winding complex compound-curved composite shapes on shape memory polymer (SMP) mandrels. Under thermal stimuli, SMPs can exhibit a radical change from a rigid polymer to a flexible, elastic state, and then back to a rigid stat…
Mechanical deformation in incompressible linear and nonlinear magnetic materials was evaluated using various conventional electromagnetic volume and surface force density methods. These conventional force density methods are the Maxwell stress tensor method, Korteweg-Helmholtz force density method (KH), magnetic charg…
Cu 2 O has excellent optical properties and could be a good host semiconductor for dilute magnetic semiconductors because doped Cu2O is a p type and direct wide-band-gap semiconductor. In this work, Mn-doped Cu2O thin films were deposited on thermally oxidized silicon substrates by radio-frequency magnetron sputtering…
The phase stability of the ${\mathrm{MgMn}}_{2}{\mathrm{O}}_{4}$ spinel has been studied by means of high-pressure x-ray diffraction for pressures up to 30 GPa. Two samples with different inversion degrees have been considered. Both spinels undergo a phase transition toward an orthorhombic structure (${\mathrm{CaMn}}_…
Zn 1 − x Mn x O layers with x varying between 0.006 and 0.22, have been prepared by metal-organic chemical-vapor deposition technique and analyzed by electron paramagnetic resonance spectroscopy. The layers show an exchange narrowed single line spectrum of Mn2+ ions; its temperature dependence demonstrates antiferroma…