Materials Literature
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Irradiation of iron with 5 MeV electrons is accompanied by the generation of point defects within small cascades, which changes the shape of the stage I resistivity recovery spectrum and stimulates the formation of di-interstitials that manifest their migration near the I D 1 substage. The specific features of stage I…
To diminish the discharge of heavy metals and lanthanides by the phosphoric acid industry, these impurities have to be removed from the mother liquor before their incorporation in the gypsum crystals. This can best be achieved by means of solvent extraction or ion exchange during the recrystallization of hemihydrate t…
Intercalation compounds of vanadyl phosphate with rubidium (Rb x VOPO 4 · y H 2 O) were prepared by reacting VOPO 4 with rubidium iodide solutions in acetone/water (volume ratio 9:1) at temperatures between 18 and 40 °C. Two phases with interlayer distance of 0.703 and 0.644 nm were formed during the intercalation; th…
Synthetic routes leading to 12 l -phenylalanine based mono- and bipolar derivatives ( 1 − 12 ) and an in-depth study of their structure−property relationship with respect to gelation have been presented. These include monopolar systems such as N -[(benzyloxy)carbonyl]- l -phenylalanine- N -alkylamides and the correspo…
Multiple crystal forms and complex melting behavior of syndiotactic polystyrene (sPS) were thoroughly examined using wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). This study has provided clear evidence for interpretation of relationships between the multiple melting peaks and polymor…
Anionic poly(ε-caprolactam), isothermally synthesized at temperatures between 155 and 195 °C by very fast carbamoyl-type activators, has been characterized by UV, DSC, and wide-angle X-ray scattering (WAXS) techniques in terms of high polymer yield, irregular structures along the chain, extent of cross-linking, T g an…
The aim of this contribution is the extension of a small strain and small deformation formulation of gradient enhanced damage to the geometrically non-linear case. To this end, Non-local Stored Energy densities, (NSE) are introduced as primary variables. Fluxes conjugated to the gradients of the NSE are then computed…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorObservation of α and γ Crystal Forms and Amorphous Regions of Nylon 6−Clay Nanocomposites Using Solid-State 15N Nuclear Magnetic ResonanceLon J. Mathias, Rick D. Davis, and William L. JarrettView Author Information University of Souther…
The magnetization and magnetoresistance of Ln1-xBaxMnO3 have been studied for a single crystal (Ln = Nd, x = 0.23) and for ceramics (Ln = Nd, Sm; 0 x0.44). It was shown that Nd1-xBaxMnO3 compositions in the range 0 x0.05 are inhomogeneous antiferromagnets; a mixed antiferro-ferromagnet state appears in the range 0.05…
The cleaved and (2 x 1) reconstructed (111) surface of p-type Si is investigated by scanning tunneling microscopy (STM). Single B acceptors are identified due to their characteristic voltage-dependent contrast which is explained by a local energetic shift of the electronic density of states caused by the Coulomb poten…
We report on the magnetic resonance of NH_3K_3C_60 powders in the frequency range of 9 to 225 GHz. The observation of an antiferromagnetic resonance below the phase transition at 40 K is evidence for an antiferromagnetically ordered ground state. In the normal state, above 40 K, the temperature dependence of the spin-…
The aim of this work is to investigate the performance of internal reforming solid oxide fuel cell (IRSOFC) and gas turbine (GT) combined cycles. To study complex systems involving IRSOFC a mathematical model has been developed that simulates the fuel cell steady-state operation. The model, tested with data available…
Dynamic light scattering data from highly absorbing solutions exhibit intensity−intensity correlation functions characterized by a sum of exponential decays superposed with an oscillatory term. A new analytical treatment is proposed, which explains this behavior as arising from the heterodyning of scattered light from…
We report the bulk polymerization of ethylglycolide (3,6-diethyl-1,4-dioxane-2,5-dione), isobutylglycolide (3,6-diisobutyl-1,4-dioxane-2,5-dione), and hexylglycolide (3,6-dihexyl-1,4-dioxane-2,5-dione) to high molecular weight polymers. The glycolides were prepared by two routes: the reaction of 2-bromoacyl bromides a…
Ein neuer Rekord ist die Gleichgewichtskonstante Kc von 1019, die für die Komproportionierung des Dieisen(II,III)-Komplexes 1 in Acetonitril bestimmt wurde. In Wasser ist der Kc-Wert von 1 viel geringer (107.9), jedoch immer noch höher als der des Creutz-Taube-Ions. Intervalence-Charge-Transfer-Banden treten bei 2520…
A GaN-based metal–insulator–semiconductor (MIS) structure has been fabricated by using ferroelectric Pb(Zr0.53Ti0.47)O3 instead of conventional oxides as insulator gate. Because of the polarization field provided by ferroelectric and the high dielectric constant of ferroelectric insulator, the capacitance–voltage char…
Nanoscale field-effect transistor (FET) has been fabricated from single-walled carbon nanotubes (CNTs). At ∼5 K, the transistor shows pronounced field effect. Most interestingly, reproducible spikes are observed in the channel conductance as a function of the gate voltage. These conductance spikes are attributed to va…
Photostimulated luminescence at room temperature was observed in a fluorozirconate glass which was doped with 1% Eu2+ or 1% Ce3+ and 5% Br− ions. Small crystals of BaBr2 (high-pressure phase) form in the glass on cooling. The Eu2+ and Ce3+ luminescence spectra comprised two emission lines each: for Eu2+ one line at 41…
We observe current rectification in a molecular diode consisting of a semiconducting single-wall carbon nanotube and an impurity. One-half of the nanotube has no impurity, and it has a current-voltage $(I\ensuremath{-}V)$ characteristic of a typical semiconducting nanotube. The other half of the nanotube has the impur…
Many liquid crystal compounds are known to give structures periodic in only one direction, say z , with a period p comparable with the light wavelength . Their optical properties are fully defined by a dielectric tensor field ( z ), which for most crystals is well known. For p < , the periodic structures behave optica…