Materials Literature
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The purpose of this study was to identify and correlate the microstructural and luminescence properties of europium‐doped Y 2 O 3 (Y 1– x Eu x ) 2 O 3 thin films deposited by metallorganic chemical vapor deposition (MOCVD), as a function of deposition time and temperature. The influence of deposition parameters on the…
A fine strontium ferrite powder with high coercivity was successfully prepared by forming hydroxide precursor particles in the continuous ethanol‐based phase of a microemulsion consisting of iso‐octane, NP9, and an ethanol solution containing Sr 2+ and Fe 3+ cations at a molar ratio of 1:12. The microemulsion‐derived…
The correct positions of the deuterium (D) atoms of many of the bound waters in the protein concanavalin A are revealed by neutron Laue diffraction. The approach includes cases where these water D atoms show enough mobility to render them invisible even to ultra-high resolution synchrotron-radiation X-ray crystallogra…
This communication provides an overview of the literature on the biocorrosion of steel in marine media, influenced by the presence of sulphate-reducing bacteria (SRB). Electrochemical aspects, microbial interactions within biofilms, the significance of medium composition and the role of iron sulphides, and hydrogen ef…
Antiferroelectric liquid crystals with a fluorinated terminal chain are reviewed. Their mesomorphism, interlayer spacing, spontaneous polarization and AF-F switching properties are described. Mixtures with an induced antiferroelectric phase are shown.
Literature data show that for MCM-41 silica made in the presence of alkyltrimethylammonium bromide (ATAB) surfactants, the best quality materials in terms of framework order are those obtained with surfactants having 12−16 carbon atom alkyl chains. Lower molecular weight surfactants seem to be more difficult to self-o…
GaMnAs layers with Mn contents from 0.05% to 7% were grown by low temperature molecular beam epitaxy. At substrate temperatures lower than 300 °C and in this composition range a uniform ternary GaMnAs compound can be grown without MnAs precipitation. Reflection high energy electron diffraction intensity oscillations r…
We present a systematic investigation of the oxidation properties of Si dots fabricated on a silicon-on-insulator (SOI) wafer. Dots with diameters varying from 9 to 81 nm were structured on a SOI wafer. These dots were oxidized in a dry oxygen atmosphere at 700, 850, and 1000 °C. The resulting structures were investig…
Results are presented of temperature and pressure studies of static dielectric permittivity (epsilon) and the nonlinear dielectric effect (NDE) in the isotropic phase of smectogenic n-cyanobiphenyls: 9CB, 10CB, and 12CB (4-cyano-4'-n-alkylbiphenyl, n = 9, 10, and 12). For the mentioned properties, pretransitional effe…
A numerical model for the analysis of laminated ferromagnetic cores of electromechanical devices is presented. The model is based on the finite-element solution of the two-dimensional (2-D) electromagnetic field problem in the lamination plane; a dynamical relation between local magnetic flux density and magnetic fiel…
Single crystal Co2MnGe Heusler alloy films were epitaxially grown on GaAs substrates by molecular beam epitaxy. The films have the bulk L21 crystal structure as determined by reflection high energy electron diffraction patterns and x-ray diffraction. A high saturation moment of 1006 emu/cm3 at room temperature has bee…
A new class of mixtures of liquid-crystalline (LC) materials and polymersis presented, consisting of sub-micrometer sized, internally crosslinked polymeric particles (see Figure) dispersed in a continuous (completely phase-separate) LC phase. Initial electro-optical experiments with these “polymer-filled nematics” ind…
An ion-beam-induced metastable phase in magnesium aluminate spinel (MgAl2O4) has been examined in detail using transmission electron microscopy. Single crystals of MgAl2O4 with (111) orientation were irradiated with 180-keV Ne+ ions at 120 K to fluences of 1016 and 1017/cm2. Selected-area electron diffraction patterns…
The propagational behavior of vibrational plane waves in a disordered medium has been analyzed theoretically in the time and frequency domains and in terms of the final scattered state in momentum space. Numerical results have been obtained for a normal-mode analysis of models of vitreous silica constructed by molecul…
Stabilized cubic zirconia is a promising candidate material for use as an inert fuel matrix for 'burning' excess Pu in light-water nuclear reactors. Zirconia is also considered to be an excellent nuclear waste form for direct geological disposal. Both applications are based on zirconia's high solubility for actinides,…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Douglas A. Reinelt, Andrew M. Kraynik; Simple shearing flow of dry soap foams with tetrahedrally…
The first Ioffe-Regel crossover for vibrational plane waves (when wavelength and mean free path are comparable) has been investigated theoretically for models of vitreous silica $(v\ensuremath{-}{\mathrm{SiO}}_{2})$ constructed by molecular dynamics. The crossover is found to be from a state of weak scattering to one…
A phenomenological two-component polaron model, originally formulated to describe the temperature-dependent transport properties of La2/3Ca1/3MnO3(LCMO), has been applied to treat the resistivity and Hall effect of EuO and ZrTe5.
SiC nanocrystalline films on Si substrates deposited using advanced electron-cyclotron-resonance chemical-vapor deposition exhibit intense visible light emission at room temperature under laser excitation. Continuous-wave and time-resolved photoluminescence measurements for these SiC films were carried out at room tem…
Abstract The mechanical properties of films prepared from mixed acetic acid aqueous solutions of chitosan ( M w = 400,000; M w / M n = 3.8) and poly(ethylene oxide) (PEO) (viscosity average molecular weight of 200,000 or 600,000) were determined. A chitosan:PEO weight ratio of 10:2 improved the mechanical properties c…