Materials Literature
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Using first-principles density-functional theory we predict a ferroelectric ground state---driven by the off-centering of the magnetic ${\text{Mn}}^{4+}$ ion---in perovskite-structure ${\text{BaMnO}}_{3}$. Our finding is surprising since the competition between energy-lowering covalent bond formation and energy-raisin…
The equivalent single-conductor model of a multiwall carbon nanotube (MWCNT) interconnect is derived analytically from the rigorous formulation of the complex multiconductor transmission-line propagation equations. The expressions of the per-unit-length (p.u.l.) equivalent quantum capacitance and kinetic inductance ar…
Graphene nanoribbon interconnects are fabricated, and the extracted resistivity is compared to that of Cu. It is found that the average resistivity at a given line-width (18nm<W<52nm) is about 3X that of a Cu wire, whereas the best GNR has a resistivity comparable to that of Cu. The conductivity is found to be limited…
We present a study of the specific heat and effective thermal conductivity in anisotropic and randomly oriented multi-wall carbon nanotube (MWCNT) and randomly oriented single-wall carbon nanotube (SWCNT) composites from 300 to 400 K. Measurements on randomly oriented MWCNTs and SWCNTs were made by depositing a thin f…
We demonstrate that metamaterial devices requiring anisotropic dielectric permittivity and magnetic permeability may be emulated by specially designed tapered waveguides. This approach leads to low-loss, broadband performance. Based on this technique, we demonstrate broadband electromagnetic cloaking in the visible fr…
The phase-field-crystal model is by now widely used in order to predict crystal nucleation and growth. For colloidal solidification with completely overdamped individual particle motion, we show that the phase-field-crystal dynamics can be derived from the microscopic Smoluchowski equation via dynamical density-functi…
We demonstrate and discuss the performance of fully integrated and flexible micro thermoelectric generators (muTEGs). The devices are fabricated with a low-cost microfabrication process based on electrochemical deposition of a thermoelectric material into a polymer mold. Overall system optimization is demonstrated by…
Novel Y 2 (MoO 4 ) 3:Eu 3+ red phosphors were synthesized through a simple coprecipitation process and characterized by using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and fluorescent spectrophotometry. The results of XRD and FE-SEM show that resultant samples are single phase and…
In the search for multiferroic materials magnetic compounds with a strongly elongated unit-cell (large axial ratio c/a) have been scrutinized intensely. However, none was hitherto proven to have a switchable polarization, an essential feature of ferroelectrics. Here, we provide evidence for the epitaxial stabilization…
We report dc and the first-ever measured small-signal radio-frequency (RF) performance of epitaxial-graphene RF field-effect transistors (FETs), where the epitaxial-graphene layer is formed by graphitization of 2-in-diameter Si-face semi-insulating 6H-SiC (0001) substrates. The gate is processed with a metal gate on t…
Silver is an effective antimicrobial agent with low toxicity, which is important especially in the treatment of burn wounds where transient bacteremia is prevalent and its fast control is essential. Drugs releasing silver in ionic forms are known to get neutralized in biological fluids and upon long-term use may cause…
Abstract: Strong inhomogeneous magnetic fields are necessary to generate a fi-nite levitation force in ground based electromagnetic levitation techniques. Exter-nal forces such as magnetic and gravitational forces influence the oscillation spec-trum and counteract the surface movement resulting in a frequency shift, a…
Abstract Diamond films are extensively deposited using plasma enhanced chemical vapor deposition (PECVD). In this work, the most important non‐neutral plasma surface processes, which are needed to analyze the deposition mechanism of diamond films from plasma gas phase, are considered. Moreover, the role of ionic speci…
The aim of the paper is to analyze in detail the glide of interacting dislocations by means of a computational model. The model is based on the numerical solution of the evolution equation providing the arc-length parametric description of the dislocations. The governing equation for the dislocation parametrizations i…
Abstract Skillfully attached! meso–meso ‐Linked diporphyrins can be efficiently and selectively functionalized with multiple unsaturated carboxylic acid groups through iridium and rhodium catalyses. This post‐modification strategy allows fine‐tuning of energy levels of each porphyrin unit. magnified image meso–meso ‐L…
Abstract Kolloidale Kugeln aller Art mit einem Metall (Mn, Fe, Co, Ni oder Cu) oder mehreren (wie Fe‐Ni‐, Co‐Cu‐, Fe‐Co‐Cu‐, Fe‐Co‐Ni‐Cu‐, Mn‐Fe‐Co‐Ni‐Cu‐ und Mn‐Fe‐Co‐Ni‐Cu‐Zn‐Phosphate) wurden bei niedriger Temperatur in Lösung hergestellt. Durch Einstellen des pH‐Werts ließen sich auch poröse und hohle Eisenphospha…
Abstract The IR and Raman spectra of uvarovite (Ca 3 Cr 2 Si 3 O 12 ) garnet were simulated with the periodic ab initio CRYSTAL code by adopting an all‐electron Gaussian‐type basis set and the B3LYP Hamiltonian. The two sets of 17 F 1 u Transverse‐Optical (TO) and Longitudinal‐Optical (LO) frequencies are generated, t…
About 1990, low voltage motor stator winding insulation failures apparently caused by short rise-time voltage surges from voltage source variable speed drives started to be noticed. The root cause was found to be the large number of pulses from the converter, which caused partial discharges between turns in the stator…
Bi 3.7 Nd 0.3 Ti 3 O 12 (BNT0.3) films were fabricated on indium tin oxide/glass substrates using a metal organic decomposition method at temperatures ranging from 500° to 650°C. A predominantly (100)‐oriented BNT0.3 film can be obtained even at 550°C. The growth mode of the predominantly (100)‐oriented BNT0.3 films f…
Transverse polarized diffuse streaks have been observed in diffraction patterns of Pb(Zr1−x Ti x )O3 (PZT) ceramics for compositions ranging from x = 0.3 (rhombohedral phase) to x = 0.7 (tetragonal phase) including the important morphotropic phase boundary (MPB) region (x = 0.48). The streaks correspond to diffuse pla…