Materials Literature
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Motivated by recent experiments on suspended graphene showing carrier mobilities as high as 200,000 cm^2/Vs, we theoretically calculate transport properties assuming Coulomb impurities as the dominant scattering mechanism. We argue that the substrate-free experiments done in the diffusive regime are consistent with ou…
After the epitaxy of LaAlO 3 on a TiO 2 -terminated {100} surface of SrTiO 3 , a high-mobility electron gas may appear, which has been the object of numerous works over the last four years. Its origin is a subject of debate between the interface polarity and unintended doping. Here we use electron energy loss "spectru…
The results of magnetic susceptibility, electrical resistivity (rho), and heat capacity measurements as a function of temperature are reported for the alloys, Ce2Rh(1-x)Co(x)Si3, crystallizing in an AlB2-derived hexagonal strcture. Ce2RhSi3 exhibits antiferromagnetic ordering at 7 K. The Neel temperature decreases gra…
Piezoresponse force microscopy is a powerful technique for nm-scale studies but is usually limited by response time. In this Letter, we report the first direct studies of ferroelectric capacitor switching on a submicrosecond time scale. Simultaneous domain imaging and sub-mus transient current measurements establish a…
Abstract The flame retardancy mechanisms of aluminium diethylphosphinate (AlPi) and its combination with melamine cyanurate (MC) in glass‐fibre‐reinforced poly(butylene terephthalate) (PBT/GF) were analysed using TGA including evolved gas analysis (TGA‐FTIR), cone calorimeter measurements using various irradiations, f…
Ferromagnetic insulators deposited on graphene can induce ferromagnetic correlations in graphene. We estimate that induced exchange splittings $\ensuremath{\Delta}\ensuremath{\sim}5\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ can be achieved by, e.g., using the magnetic insulator EuO. We study the effect of the induced sp…
Abstract Three novel polyoxometalate compounds consisting of Anderson‐type anions and trivalent lanthanide cations, [Ln(H 2 O) 7 Cr(OH) 6 Mo 6 O 18 ] n ·4nH 2 O (Ln = Ce 1 ; Sm 2 ; Eu 3 ), have been synthesized in aqueous solution and characterized by single crystal X‐ray diffraction, elemental analyses, IR spectra, a…
$\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ (STO), $\mathrm{Sr}\mathrm{Mn}{\mathrm{O}}_{3}$ (SMO), and $\mathrm{La}\mathrm{Mn}{\mathrm{O}}_{3}$ (LMO) ultrathin films with layer thicknesses of 1--4 perovskite unit cells were grown on a STO substrate. The physical and electronic structures of ultrathin films and interfaces…
Hyper-Raman spectra of two lithium borate glasses, 4B 2 O 3 :Li 2 O and 2B 2 O 3 :Li 2 O, are compared to those of pure boron oxide glass, v -B 2 O 3 . A mode analysis is performed using a structural model based on the symmetry of the elementary structural units (ESUs) constituting the glasses. Most spectral component…
Epitaxial layers of uranium have been grown on a variety of buffer/seed layers on sapphire substrates by UHV magnetron sputtering and their structure determined using x-ray diffraction. The buffer layers were epitaxial layers of niobium, tungsten and niobium covered by a seed layer of hcp gadolinium, on which uranium…
In this work, we analyze the far-field pattern produced by a grating made of strips with two different random roughness levels. The efficiency and shape of the diffraction orders is obtained, which are shown to depend on the statistical properties of roughness. We assume for the calculations that the grating can be us…
Double patterning (DP) has now become a fixture on the development roadmaps of many device manufacturers for half pitches of 32 nm and beyond. Depending on the device feature, different types of DP and double exposure (DE) are being considered. This paper focuses on the requirements of the most complex forms of DP, pi…
Abstract Syntheses and Structures of the First Polynuclear Manganese Guanidine Complexes and of the First Manganese Complexes Containing Mono‐Protonated Bis‐Guanidine Ligands Metallation of two differently alkylated bis‐guanidine ligands containing a central pyridine functionality, namely N 2 ,N 6 ‐bis(1,3‐dimethylimi…
We disclose the synthesis of a porphyrin-fullerene pinwheel that was subsequently observed by scanning tunneling microscopy. The molecule was designed to further our understanding of fullerene-surface interactions, directional control, and surface-rolling versus pivoting capabilities of this class of nanomachines. The…
Strontium sulfide doped with copper has been regarded as one of the most promising inorganic materials for the blue-green color phosphor. A wet chemical precipitation method with post-annealing is presented for the synthesis of copper-doped SrS nanoparticles. XRD studies revealed the phase purity of SrS particles with…
In this work, we report a hydrothermal method for self-assembly and organization of as-synthesized gold nanoparticles into various aggregative morphologies. Using the assembled gold nanoparticles as structural precursors, furthermore, mesoporous gold spheres in either discrete or interconnected form can be prepared at…
We have investigated, for oblique propagation, the dispersion relation and associated electric fields of one-dimensional photonic crystals composed of alternating layers of right-handed and left-handed materials (RHM and LHM). Calculations are performed by assuming that the dielectric permittivity and magnetic permeab…
The solubility data of adefovir dipivoxil in five different binary mixed solvents formed by isopropyl ether with ethanol, 2-propanol, dichloromethane, ethyl acetate, and acetone at 298.15 K were measured with the mole fraction of isopropyl ether ranging from 0.000 to 1.000. A laser monitoring observation technique was…
A new pyrochlore-type structure (Bi 1.56 Co 0.44 )(Sb 1.48 Co 0.52 )O 7 compound has been synthesized using ceramic method in air. Rietveld refinements using X-ray powder diffraction data confirmed an overall A 2 B 2 O 7 cubic pyrochlore structure with a = 10.44896 (2) Å and Fd -3 m symmetry. The reliability factors a…
Abstract Two mixed‐valent disc‐like hepta‐nuclear compounds of [Fe II Fe III 6 ( tea ) 6 ](ClO 4 ) 2 ( 1Fe , tea = N(CH 2 CH 2 O) 3 3− ) and [Mn II 3 Mn III 4 ( nmdea ) 6 (N 3 ) 6 ]·CH 3 OH ( 2Mn , nmdea = CH 3 N(CH 2 CH 2 O) 2 2− ) have been synthesized by the reaction of Fe(ClO 4 ) 2 ·6H 2 O with triethanolamine (H…