Materials Literature
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The partial discharge measurement is a very well known possibility to assess the quality of an insulation system. The aim is the detection of destruction in the electrical insulation as a result of electrical stress. In the working field of technical diagnostics, alternatives to the conventional partial discharge (PD)…
A new composition content quaternary-alloy-based phase change thin film, Sb-rich AgInSbTe, has been prepared by DC-magnetron sputtering on a K9 glass substrate. After the film has been subsequently annealed at 200 degrees C for 30min, it becomes a crystalline thin film. The diffraction peak of antimony (Sb) are observ…
The ⟨001⟩-oriented 0.7PMN–0.3PT and 0.67PMN–0.33PT crystals are characterized under uniaxial stress and electric field loading above the coercive field. Strain-electric-field and electric-displacement-electric-field hysteresis loops are measured at various compressive stresses showing a notable effect of stress on the…
We report on the ultrahigh piezoelectric response perpendicular to some special cleavage plane in BaTiO3 single crystals. An extremely high value of piezoelectric coefficient d33 value over 2000pC∕N was obtained after being poled perpendicular to special plane (270) in BaTiO3 crystal, which is more than 20 times highe…
For size reduction of electric power equipment, the electric field stress around solid insulators is to be increased and must be carefully considered. This concern may be solved by the application of FGM (functionally graded materials). We investigated an application feasibility of FGM, from both an experimental appro…
Abstract Polymer nano‐composites made with a matrix of anhydride‐cured diglycidyl ether of bisphenol A (DGEBA) and reinforced with organo‐montmorillonite clay were investigated. A sonication technique was used to process the epoxy/clay nano‐composites. The thermal properties of the nano‐composites were measured with d…
In this study, the influence of nano-size silica filler is compared with micro-size filler in silicone rubber using the ASTM 2303 inclined plane tracking and erosion test. Silicone rubber samples filled with 5 /spl mu/m mean size ground silica are compared with silicone rubber filled with 12 nm average size fumed sili…
We report on the integration of epitaxial colossal magnetoresistive La0.67Ba0.33MnO films on Si(100) semiconductor using SrTiO3 template layer by pulsed-laser deposition. X-ray diffraction reveals the superior quality of the manganite film that grows epitaxially on heteroepitaxially grown SrTiO3 template layer on Si s…
The dielectric properties of polyamide nanocomposites were examined, focusing especially on their resistance against partial discharges. The paper compares the surface roughness caused by partial discharges and that caused by exposure to plasmas, between polyamide with and without inorganic nanofillers. From X-ray dif…
Building on the ferroelectric family based on the Bi(Me+3)O3–PbTiO3 solid solutions, the complex solid solution (1−x)Bi(Mg3∕4W1∕4)O3–xPbTiO3 [(1−x)BMW–xPT] was investigated. This system was found to exhibit a broad morphotropic phase boundary at x∼0.48mol% PbTiO3 with a corresponding Curie temperature of 205°C separat…
Transistors with gate lengths below 100 nm generate phonon hotspots with dimensions on the order of 10 nm and peak power densities of about 50W∕μm3. This work employs molecular dynamics to investigate the impact of lattice energy density on phonon scattering at the hotspot. The hotspot studied in this work consists of…
Differential scanning calorimetry, in conjunction with x-ray and electron diffraction, is used to investigate the A1 to L10 ordering transformation in binary FePt films with compositions in the range of 47.5–54.4at.% Fe. The kinetic ordering temperature, taken as the calorimetric peak temperature at a heating rate of…
Helicity has been induced in meso-meso linked oligomers by hydrogen bonding host-guest interactions with cyclic urea. Helical porphyrin arrays thus formed exhibit chirality amplification and enhanced two-photon absorption properties.
Time delay estimation (TDE) is essential for PD location using the UHF technique. However, noise and effects of multi-path propagation are two main problems affecting the accuracy of the estimate. Comparing two methods, which are based on the cumulative energy curve and power curve respectively, a cross correlation ba…
The hydrophobicity status of silicone rubber (SIR) is affected by various factors. In order to study the influence of temperature on the hydrophobicity of silicone rubber, three kinds of SIR samples, which are clean surface, contaminated, and corona treated ones, were used. The static contact angle of a water droplet…
Ru(II)- and Os(II)-polypyridine termini are linked by a quinquethiophene bridge (the inter-metal separation is ca. 1.9 nm) wherein excitation energy flows into the luminescent Os-based unit by way of a conductive level.
Multiwalled carbon nanotubes (MWCNTs) were expanded by 2.5 times in diameter through high-energy (MeV) ion irradiation. Pristine MWCNTs were synthesized onto SiO2 substrate by chemical vapor deposition. The 4MeV Cl2+ ions with a dose of 3×1016ions∕cm2 were irradiated on MWCNTs. From high-resolution transmission electr…
The region-by-region polarization switching in ferroelectric Pb(Zr,Ti)O3 thin films sandwiched between Pt electrodes has been directly observed using piezoelectric scanning probe microscopy. A resolution improved by one order-of-magnitude compared to the standard piezoelectric response imaging technique for ferroelect…
Here we describe the fabrication of nanocomposite-based microcatheter through-melt extrusion utilizing high-purity carbon nanotubes as filler and nylon as matrix. Homogeneous dispersion of carbon nanotubes in nylon can provide novel microcatheters with enhanced mechanical properties (easier to handle) and extremely re…
The microscopic origin of ferroelectric instabilities in Aurivillius compounds is investigated from first principles using the full-potential linearized augmented plane-wave method. A comparative study of the ferroelectric instabilities in archetype materials like ${\mathrm{Bi}}_{2}{\mathrm{WO}}_{6}$, ${\mathrm{SrBi}}…