Materials Literature
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Dominant n-type conductivity in sulfur-doped chemical-vapor-deposited diamond is observed by Hall-effect measurement. The activation energy is estimated at 0.5–0.75 eV above 600 K. Below 600 K, the carrier concentration deviates from the activation energy, and Hall mobility decreases in comparison with that above 600…
Using spectroscopic ellipsometry, the optical properties of the Bi3.25La0.75Ti3O12 (BLT) thin films with different film thicknesses on platinized silicon substrates prepared by chemical solution methods have been investigated in the 400–1700 nm wavelength range. By fitting the measured ellipsometric parameter (Ψ and Δ…
Foams of conventional ceramics are attractive for a wide range of industrial applications such as filters, insulators, heat exchangers and others. Advanced functional ceramics, e.g., superconductors or piezoceramics profit from a foam structure for a variety of applications. Foams of Y 2 BaCuO 5 —being the properitect…
Abstract This study investigates the effect of temperature on the ultrasonic degradation of polyvinyl acetate and polyvinyl chloride in chlorobenzene. The time evolution of molecular weight distribution was determined using gel permeation chromatography. Continuous distribution kinetics was used to obtain the degradat…
The phenyl-capped 3,4-ethylenedioxythiophene (EDOT) trimer is a well-defined oligomer of the related poly(3,4-ethylenedioxythiophene), the conjugated polymer that forms the basis of the commercialized conducting polymer “PEDOT-PSS.” EDOT-based oligomers are themselves potential candidates for applications in molecular…
We model the polarization behavior of ferroelectric multilayered composite structures including the double layer and the triple layer under the action of variable fields. The model takes into consideration the ceramic/polymer interfacial charge and the nonlinear hysteresis nature of the ferroelectric constituent mater…
The dynamics of polarization backswitching in highly oriented Pb(Zr0.3Ti0.7)O3 (PZT) thin films has been studied in nanoscale using piezoresponse scanning force microscopy (SFM). Our measurements reveal that a SFM-written domain with diameter about 200 nm in PZT films loses its polarization through both the sidewise a…
The interaction of NO with SrTiO3(100) surfaces was investigated using thermal desorption, photoemission, and first-principles density-functional calculations. The crystals used in the experiments exposed mainly (>80%) the TiO2-terminated face of SrTiO3(100). On the stoichiometric surfaces, the adsorption of NO…
An evolution of the double-beam laser interferometer used for piezoelectric measurements in ferroelectric thin films is reported. Measuring the d33 hysteresis of a ferroelectric material using lock-in technique with large time constants requires a varying bias field to be applied to the sample over a long period of ti…
The assembly of two-dimensional cyanide-bridged Fe(III)-Ni(II) square grid networks at the air-water interface and subsequent transfer of these networks as isolated monolayer, isolated bilayer, and multiple bilayer (multilayer) films via the Langmuir-Blodgett technique results in novel low-dimensional systems in which…
We have measured the step response in thin film Permalloy as a function of both a hard-axis pulsed field amplitude and an easy-axis longitudinal magnetic bias field using a pulsed inductive microwave magnetometer. The bias field ranged from 0 to 8000 A/m (0 to 100 Oe) and the pulsed field varied from 0.32 to 320 A/m (…
Fe–29.9 at.% Pd shape memory ribbons have been manufactured by means of the free jet melt-spinning method. The microstructure, the shape memory effect and the texture of the manufactured melt-spun ribbons have been studied. Some of the results are compared with those obtained in similar studies on Fe–Pd shape memory m…
Abstract We examine some of the structural aspects that influence the mesomorphic behavior of liquid‐crystalline dimeric epoxy resins with imine groups in the mesogens. We synthesized two new series of monomers and compared them with previously synthesized monomers. Compared with previously studied series, the imine g…
We have investigated the electrical transport properties through crossed nanotube junction between two metallic single-walled carbon nanotubes. Depending on the temperature range, the crossed junction exhibits different behaviors. At high temperatures, the crossed junction acts as a tunneling junction and its conducta…
Magnetic properties, phase evolution and aftereffect of melt-spun Pr10Fe90−xBx (x=5.88–11.5) nanocomposite ribbons have been studied. Summarizing the results of thermal magnetic analysis and Mössbauer spectroscopy, two phases, namely Pr2Fe14B and α-Fe, were found for ribbons with x=5.88 and 7.5, while additional two m…
Thick (1–14 μm) films of ferrimagnetic barium hexaferrite (BaFe12O19 or BaM) having the c-axis ([0001]) in the film plane were deposited by pulsed laser deposition onto a-plane (112¯0) sapphire (Al2O3) substrates, and were found to have a (101¯0) orientation. Torque and magnetization measurements show these films are…
Bismuth-bearing tetrahedrite and tennanite were synthesized from dry runs in evacuated silica glass tubes at 350 °C, 450 °C and 520 °C, and studied by means of microprobe analyses on polished sections and X-ray powder diffraction. Charges were prepared with two Zn or Fe atoms p.f.u., with pure As, resp. Sb, or with As…
The Young’s modulus and helium gas permeability of vapor-deposited poly(4,4′-oxydiphenylenepyromellitimide) were measured at cryogenic and elevated temperatures (10–573 K). The Young’s modulus decreased with increasing temperature from 5.5 GPa at 10 K to 1.8 GPa at 573 K. The temperature dependency of the permeability…
Laser annealing has been employed to decompose half-metallic CrO2 into insulating Cr2O3 in air ambient. While both Cr2O3 and CrO2 are present, the relative fraction of each phase was controlled by changing the duration and power of laser irradiation. Glancing angle x-ray diffraction and micro-Raman scattering were use…
A molecular tetrad consisting of a free base porphyrin (P) linked to a triquinone moiety consisting of a naphthoquinone bearing two benzoquinones (NQ−BQ 2 ) has been synthesized and its photochemistry has been investigated using time-resolved spectroscopic techniques. Excitation of the porphyrin chromophore of the P−N…