Materials Literature
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Nanostructured PrCo5-based PrxCo100−x (x=15.4–20.5) powders have been synthesized by mechanical milling and subsequent annealing cast alloys. The best overall properties have been developed in stoichiometric PrCo5 powders milled for 4 h and annealed at 800 °C for 1 min with a high coercivity of 16.3 kOe along with a h…
Thermal degradations of 4,4′-diphenylmethane diisocyanate-based thermoplastic polyurethane elastomers were conducted and investigated as functions of heating conditions by using thermogravimetric analysis, ultraviolet-visible (UV-vis) spectroscopy, gel permeation chromatography (GPC), and Fourier transform infrared (F…
Experimental and theoretical polarized V K-edge spectra of ${\mathrm{V}}_{2}{\mathrm{O}}_{5}$ are presented. By analyzing experimental spectra, we find that quadrupole transitions are significant, although not dominant at the pre-edge region. Real-space multiple-scattering calculation, relying on a non-self-consistent…
Excellent deoxygenation of ketones and aldehydes is achieved with Keggin-type polyoxometalates in the presence of hydrogen (see Equation (1) for an example). The mixed addenda phosphovanadomolybdate [PV(2)Mo(10)O(4)](5-) was found to be the best catalyst. X-ray diffraction and IR studies suggest that the polyoxometala…
A phenomenological thermodynamic model has been developed to account for the effects of the film thickness on various properties of ferroelectric thin films. To this end, we have suitably incorporated a position-dependent stress distribution function into the elastic Gibbs function. Various physical properties can be…
The dynamics and the reversibility conditions of crystalline↔amorphous transitions induced in thin Ge0.07Sb0.93 films upon picosecond laser pulse melting were studied by real-time reflectivity measurements with nanosecond and picosecond resolution. The full transformation time could be resolved in a single exposure ex…
Vibrationally resolved 355 and 266 nm anion photoelectron spectra of B2N are presented. Photodetachment to two electronic states of linear B–N–B is observed and, aided by electronic structure calculations, assigned to the X̃ 1Σg+→X̃ 2Σu++e− and X̃ 1Σg+→Ã 2Σg++e− transitions. The electron affinity of B2N is 3.098±0.005…
In magnetoresistance measurements of a single multiwall carbon nanotube we have observed the periodic oscillation which increases in amplitude below 30 K. The period has the angular dependence of $1/\mathrm{cos}\ensuremath{\theta},$ $\ensuremath{\theta}$ being the angle between the nanotube axis and magnetic field, an…
The metal-insulator transition in manganites is strongly influenced by the concentration of holes present in the system. Based upon an orbitally degenerate Mott-Hubbard model, we analyze two possible localization scenarios to account for this doping dependence: First, we rule out that the transition is initiated by a…
Ab initio configuration interaction (CI) calculations are performed to study the ground state of small neutral and singly charged silver bromide clusters AgnBrp(±) (n,p⩽2). The results are obtained at complete active space self-consistent field and also at variational plus second order perturbational multireference CI…
A microscopic theoretical model is proposed for calculating the characteristics of ultraviolet photoemission and x-ray secondary electron emission induced from CsI photoconverters. This approach is based on a realistic picture of the basic interactions of photons and induced electrons within the material. Both differe…
Surface photovoltage spectroscopy (SPS) is introduced as a powerful tool for band gap determination of semiconductor powders. The main advantage of SPS is that scattering and reflection do not interfere with the spectra. Therefore, it does not suffer from the inherent limitations of transmission/reflection based spect…
Surface morphology characteristics and electron emission properties of boron-doped polycrystalline diamond thin films grown by microwave plasma-assisted chemical-vapor deposition were investigated using an ultra-high-vacuum scanning tunneling microscope. Small secondary grains with average size less than 10 nm were ob…
Poly(ethylene oxide) (PEO) chains were grafted onto a spherical thermally sensitive poly( $N$-isopropylacrylamide) microgel with a low critical solution temperature of $\ensuremath{\sim}32\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$. The shrinking of the microgel at higher temperatures led to a dramatic decrease in…
de Haas--van Alphen and Shubnikov--de Haas oscillations have been used to study the Fermi surface of the simple tetragonal $R{\mathrm{AgSb}}_{2}$ series of compounds with $R=\mathrm{Y},$ La-Nd, and Sm. The high quality of the flux-grown single crystals, coupled with very small extremal cross sections of Fermi surface,…
We have investigated thermal strain effects on excitons in CuI thin films with a thickness of 10--3000 nm grown by vacuum evaporation onto (0001) ${\mathrm{Al}}_{2}{\mathrm{O}}_{3},$ fused silica (quartz), and (001) NaCl substrates. The x-ray-diffraction patterns indicate that the crystalline thin film grown on every…
We report on ab initio bulk and surface atomic and electronic structure calculations of ${\mathrm{WSe}}_{2}.$ The calculations are based on the local-density approximation employing nonlocal, normconserving pseudopotentials together with Gaussian orbital basis sets. We have carried out a fairly general case study incl…
Poly(methyl methacrylate) with a thiophene end group having narrow polydispersity was prepared by the Atom Transfer Radical Polymerization (ATRP) technique. Subsequently, electrically conducting block copolymers of thiophene-capped poly(methyl methacrylate) with pyrrole were synthesized by using p-toluene sulfonic aci…
The electronic properties of single phase type-I clathrate compounds, ${\mathrm{Ba}}_{8}{\mathrm{Au}}_{6}(\mathrm{Si}\mathrm{}or\mathrm{}\mathrm{Ge}{)}_{40}$ and ${\mathrm{Ba}}_{8}{\mathrm{Ge}}_{46\ensuremath{-}x}$ have been investigated. The crystal structure, electrical resistivities, magnetic susceptibilities, the…
Antiferroelectric lead zirconate (PZ) thin films were deposited by pulsed laser ablation on platinum-coated silicon substrates. Films showed a polycrystalline pervoskite structure upon annealing at 650 °C for 5–10 min. Dielectric properties were investigated as a function of temperature and frequency. The dielectric c…