Materials Literature
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A theoretical study is made of the magnetization versus applied field curves of ferromagnetic/nonmagnetic multilayers constructed according to a Fibonacci quasiperiodic sequence. The ferromagnetic films are assumed to have uniaxial anisotropy and are coupled by both bilinear and biquadratic effective exchange. The eff…
Here we report the growth of sub-millimeter MgB2 single crystals of various shapes under high pressure in Mg-B-N system. Structure refinement using a single-crystal X-ray diffraction analysis gives lattice parameters a=3.0851(5) A and c=3.5201(5) A with small reliability factors (Rw =0.025, R=0.018), which enables us…
Research on the exchange bias (EB) phenomenon has witnessed a flurry of activity during recent years, which stems from its use in magnetic sensors and as stabilizers in magnetic reading heads. EB was discovered in 1956 but it attracted only limited attention until these applications, closely related to giant magnetore…
We find that GeIV substitutes cleanly for AlIII at the central tetrahedral site in the AlO4Al12(OH)24(OH2)127+ polyoxocation, creating a GeO4Al12(OH)24(OH2)128+ cation with some slight structural distortion, but a structure that overall still resembles an ε-Keggin molecule. These substituted aluminum polyoxo molecules…
Electroluminescence detected in many different polymers under uniform 50 Hz ac and dc fields exhibits a threshold-like character, i.e. the light emission increases supralinearly with the applied voltage above a critical value called the emission threshold. The significance of this threshold is not straightforward. It…
The Debye equation with slit-smeared small angle x-ray scattering (SAXS) data is extended from an ideal two-phase system to a pseudo two-phase system with the presence of the interface layer, and a simple accurate solution is proposed to determine the average thickness of the interface layer in porous materials. This…
We present the photoluminescence characterization of pure and 0.2 mol% samarium-doped zirconium oxide, prepared by the sol-gel process and annealed at 1000 °C to stabilize the monoclinic phase. Under excitation at 320 nm the Sm 3+ -doped monoclinic zirconium oxide shows strong emission at the green (569 nm) and red (6…
ZnSe quantum dots have been synthesized using a simple aqueous route. Coating ZnSe quantum dots with a ZnS monolayer, yields a remarkable enhancement in the PL quantum efficiency at room temperature without affecting the spectral distribution. The results suggest that passivation of surface states, along with an incre…
Push−pull organic molecules that combine a polyfunctionalized aromatic electron-donating carbazole moiety with nitro or cyano acceptor groups, linked directly or through a polyenic chain, have been prepared and characterized as nonlinear optical (NLO) chromophores. A methoxycarbonyl group has been introduced to prepar…
Atomic scale imaging using scanning tunneling microscopy has been used to investigate the morphology and structure of high molecular weight polymers attached to carbon nanotubes. A surprising degree of regularity is observed in the attached polymers, suggesting a “nanotube-driven” crystallization process is present. T…
We study morphologies of thin-film diblock copolymers between two flat and parallel walls. The study is restricted to the weak segregation regime below the order-disorder transition temperature. The deviation from perfect lamellar shape is calculated for phases which are perpendicular and parallel to the walls. We exa…
Cd1-xZnxTe crystals with x in the range of 0.1-0.2 were grown by the high-pressure vertical Bridgman method from pre-synthesized CZT. Resistive graphite heaters were used to control the temperature profiles within the furnaces, and an argon overpressure was used to reduce the cadmium loss. The crystals were doped with…
The period from 1970s to 1980s witnessed notable interdisciplinary breakthroughs in sol−gel science with demonstrations that this technology could be extended to the encapsulation of functional biomolecules such as enzymes and antibodies within ceramic matrixes. Since these landmark studies, some of nature's most sens…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Dislocation densities, arrangements and long range internal stresses in cold rolled polycrystalline Cu, Ni, and Al, as well as in cold torsioned Fe, were determined by X-ray diffraction profile analysis using synchrotron radiation. At different deformation degrees, scanning measurements across single grains with a foc…
${\mathrm{TlGaTe}}_{2}$ has a quasi-one-dimensional crystal structure consisting of Tl and linked ${\mathrm{GaTe}}_{4}$ tetrahedral chains. We have studied the electronic band structure of ${\mathrm{TlGaTe}}_{2}$ by means of photoemission spectroscopy and band-structure calculation. Comparison between both results is…
Diazo resin (DR) and poly(maleic anhydride- co -styrene) (PMS) can form a charge-transfer complex in methanol. A multilayer film was fabricated successfully from DR and PMS based on the charge-transfer interaction. After UV irradiation, the stability of the film toward polar solvents increases significantly due to the…
Atomistic simulations show that there are long-ranged ferroelectric interactions between the ferroelectric layers in ferroelectric/paraelectric superlattices mediated by continuous chains of polarization running through the intervening paraelectric layers. The resulting behavior of the superlattice is strongly depende…
Interlayer modification of a layered polysilicate kanemite was performed by silylation with mono-, di-, and trichloro(alkyl)silanes. The introduction of silyl groups into the interlayer region was confirmed by XRD, IR, 13 C NMR, and 29 Si NMR. The layered structures of the silylated products were confirmed by swelling…