Materials Literature
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Ba Al 2 S 4 : Eu thin films were prepared from a multilayered BaS:Eu∕Al2S3 thin-film structure, deposited with electron-beam evaporation. Depending on the deposition and postdeposition annealing temperature, europium-doped BaAl2S4 thin films can show both an orthorhombic and the more common cubic crystal structure. Th…
Measurements of the dielectric constant of amorphous and crystalline Pr2O3 are reported. The high value ∼25 for the polycrystalline phase is discussed in terms of the network structure and comparison is made with heavy rare-earth oxide values. The specific cases of LaAlO3 and Ta2O5 are also discussed and the role of n…
Abstract A series of new AB type azobenzene monomers based on various substituted phenols and higher order fused/extended aromatic rings were synthesized and their hyperpolarizability tensor β determined by hyper‐Rayleigh scattering (HRS) measurement in methanol. The electron donor (OH) and acceptor units (COOH) wer…
Contact effects between solution processed conducting polymer electrodes with semiconducting polymers in field effect transistors are investigated. Limited conductivity of polymer electrodes and interfacial doping of the active semiconducting polymer by the conducting polymer electrode are found to be two important fa…
High Pr-content (Tb0.2Pr0.8)(Fe0.4Co0.6)1.93−xBx magnetostrictive alloys (0.05⩽x⩽0.15) with a single cubic Laves phase were synthesized by arc-melting and subsequent annealing. The Curie temperature, Tc, and the lattice parameter, a, of the Laves phase in the alloys increase with increasing the boron content up to x=0…
The electronic structure of the mixed-valence Sm and Eu pnictides ${\mathrm{R}}_{4}{X}_{3}$ ($\mathrm{R}=\mathrm{Sm}$, Eu; $X=\mathrm{As}$, Sb, Bi) and samarium and europium chalcogenides ${\mathrm{Sm}}_{3}{X}_{4}$ ($X=\mathrm{S}$, Se, Te), ${\mathrm{Eu}}_{3}{\mathrm{S}}_{4}$ were investigated theoretically from first…
To examine the electronic structure of the valence band, ultraviolet photoemission spectra of a series of layered oxychalcogenides, LaCuOCh (Ch=S, Se, and Te), were measured. The measurements were conducted using HeII, HeI, and NeI excitation lines to observe the excitation energy dependence of the spectral shape. Ene…
Er 3 + ion fluorescence was excited with a 980-nm pump laser in Er-doped rare-earth aluminate (REAl) glasses with Er-dopant concentrations from 0.5–30mol% (oxides basis). The spectral and decay characteristics were measured at ∼1550nm from Er3+I13∕24 and at ∼2750nm from Er3+I11∕24. Red and green light emissions were a…
Pb-assisted stress-corrosion cracking (PbSCC) of Alloy 600 steam-generator tubing in high-temperature-water service and laboratory tests were studied by analytical transmission electron microscopy of cross-sectioned samples. Examinations of pulled tubes from many pressurized water reactors revealed lead in cracks from…
A comprehensive picture of electromechanical responses of carbon single-walled nanotubes (SWNTs) is obtained using ab initio density-functional theory and self-consistent π-orbital Hamiltonian. We find a linear behavior of the energy gap of zigzag SWNTs as a function of the axial strain with different slopes for compr…
Radiative recombination processes in the transition metal dichalcogenide compound $2H\text{\ensuremath{-}}{\mathrm{WS}}_{2}$ are investigated. The strong sharp line photoluminescence in the spectral range 1.32--1.34 eV is attributed to the recombination of excitons bound on electron-attractive neutral centers, formed…
Abstract The temperature dependence of the local order parameter and relaxation time distribution function have been determined in (1 – x )PMN– x PZT ceramic samples via dielectric permittivity. Above the Burns temperature, the permittivity was found to follow the Currie–Weiss law, and with temperature decreasing the…
Abstract Partial and complete self‐assembled monolayers (SAMs) of octadecylphosphonic acid (OPA) have been deposited onto air‐exposed surfaces of the metals copper, silver, gold, iron, silicon and aluminium, as well as onto freshly cleaved, air‐exposed surfaces of the minerals muscovite and biotite. The line width of…
We present an analysis of the effect of finite temperatures on the deuteron nuclear quadrupole coupling constants in a strongly hydrogen-bonded molecular crystal by means of first-principles Car-Parrinello molecular-dynamics simulations. Our findings agree well with experiments and provide a microscopic explanation of…
The solute-drag-dependent growth kinetics of core-shell-structured grains in rare-earth-doped BaTiO3 ceramics was studied based on an analytical description of the diffusion of rare-earth atoms doped. Dependence of the sizes of grain core and shell on the sintering conditions, dopant content, and starting powder size…
We report on broadband microwave-frequency measurements of epitaxial ferroelectric Ba0.3Sr0.7TiO3 thin films that reveal systematic increases in the loss and dispersion as the frequency increases toward 40 GHz. Our analysis provides evidence that the origin of this increased loss and dispersion is the direct coupling…
The results of a parametric study on the growth of vertically aligned carbon nanofibers (CNFs) by high-density inductively coupled plasma (ICP) chemical-vapor deposition are reported. We investigated the mechanisms that cause the detachment of CNFs during the growth process by high-density plasma-enhanced chemical-vap…
The effects of phase distribution and grain size on the effective anisotropy and coercivity of the exchange-coupled nanocomposite permanent materials have been investigated in this paper. The effective anisotropy of nanocomposite permanent materials is supposed to be equal to the statistical average value of the aniso…
Coexistence between the isotropic and the nematic phase in suspensions of rods is studied using grand canonical Monte Carlo simulations with a bias on the nematic order parameter. The biasing scheme makes it possible to estimate the interfacial tension gamma(IN) in systems of hard and soft rods. For hard rods with LD=…
The binding energy of a biexciton confined in InAs nanorods is calculated using the potential morphing method. Once the system under investigation is in a crossover state, the spectral shapes of the exciton and biexciton photoluminescence were predicted. Our results indicate that for the decreasing length of the nanor…