Materials Literature
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Internal friction Q–1 and Young‘s modulus E were measured as functions of temperature for undoped Pb(Zr0.65Ti0.35)O3 ceramics obtained by the sol-gel technique. Experiments were performed with a RAK-3 resonant mechanical spectrometer. The E(T) curves show two anomalies associated with two peaks, PR and PF, in the Q–1(…
Materials scientists are facing unprecedented challenges in many areas, such as energy conversion and storage, microelectronics, telecommunication, display technologies, catalysis, and structural materials. Experimental methods generate increasing amounts of data. New computational methods, highperformance computer ha…
Temperature modulated alternating differential scanning calorimetric studies show that Se rich Ge0.15Se0.85−xAgx (0 x 0.20) glasses are microscopically phase separated, containing Ag2Se phases embedded in a Ge0.15Se0.85 backbone. With increasing silver concentration, Ag2Se phase percolates in the Ge–Se matrix, with a…
Chemical vapor deposition was used to synthesize CdS nanowires via the vaporliquid-solid growth mechanism. After Ti/Au contacts were patterned to the nanowires using electron beam lithography, photoresponse studies were conducted. A significant response was observed when the wires were exposed to visible light; this o…
The surface of superfine boron powder was coated with lithium fluoride prepared by reacting LiOH with HF by the neutral precipitation method. The effect of the concentration of LiOH solution on the coating effectiveness of superfine boron particles was studied. Transmission Electron Microscope, rotary viscometer and X…
The desorption spectrum of NO adsorbed on the surface of TiO2 powder was determined by temperature programmed desorption. The molecular orbital theory was u tilized to investigate the crystal cluster model of NO adsorbed on TiO2 and th e change of band gap in the adsorption process. The results indicate that there exi…
Previous results have shown that the plasma-chemical hybrid process was effective for simultaneous removal of NOx, SOx and diesel particulate. In the present study, two types of plasma supplies, the direct oxidation method and the indirect plasma oxidation (air radical injection) method, were evaluated with regard to…
Transparent polycrystalline ceramics of with a composition of were successfully fabricated from nanosized powders obtained by a combustion method. The resulting ceramics sintered in atmosphere at 1850°C for 6 h have a near-pore-free structure and are composed of uniform grains with an average size . The obtained ceram…
Negative tone patterns were created by polymer-contamination writing in a transmission electron microscope. Typical line edge roughness of the polymer lines was found to be below 1nm. The patterns were transferred to bismuth films using an anisotropic ion etch, resulting in final bismuth line edge roughness less than…
Cast duplex stainless steels of CF8M and CF8 are used in major components because of their superior characteristics, such as corrosion resistance, weldability, and so on. However, these stainless steels are known to have tendency of thermal aging embrittlement after long term service. Therefore, the mechanical propert…
A homologous series of chiral compounds, (R)‐6‐(3‐alkoxy‐2‐methylpropionyloxy)‐2‐naphthyl 4‐alkoxybenzoates, nMPNmB (n = 2–5, m = 6–13), derived from methyl (R)‐3‐hydroxy‐2‐methylpropionate, was prepared for the study of mesormorphic phases. The mesophases were determined mainly by their microscopic textures and ident…
In order to evaluate the effect of pre-heating on biosolubility and water-resistance of alkaline earth silicate (AES) fibers in MgO-SrO-SiO2 and MgO-CaO-SrO-SiO2 compositions, dissolution experiments of the heat-treated (from 110 degrees C to 1,260 degrees C) AES fibers have been carried out in a glycine solution and…
Magnetic properties have been examined for zinc ferrite nanocrystals synthesized via hydrothermal reaction. The hydrothermal reaction has been carried out at 200°C using an aqueous suspension containing zinc hydroxide and iron hydroxide. X-ray diffraction analysis indicates that the resultant specimens are composed of…
The continuous miniaturization and increasing complexity of the materials used in modern technology requires to have access to chemical composition, electronic structure, magnetization, and fluctuations in these properties at sub-micron and nanometer scales. X-ray photoemission electron microscopy (XPEEM) can provide…
Water tree is one of the degradation aspects of XLPE cables used for under-ground distribution or transmission lines. We have developed the loss current method using 3rd harmonic in AC loss current for cable diagnosis. Harmonic components in loss current arise as a result of the non-linear voltage-current characterist…
A carbon black (CB) filled styrene-butadiene rubber (SBR) compound was investigated by acoustic techniques, scanning acoustic microscopy and longitudinal wave velocitometry.The CB agglomerates of larger than 5 µm dispersed in the compound mixed by two-roll mill were observed as black spots in acoustic micrographs. On…
Hydrogen embrittlement (HE) of metals used in the system of fuel-cell vehicles, i.e., high-pressure hydrogen storage tanks and vessels, compressors, valves and pipes, is investigated in 70 MPa hydrogen at room temperature. The materials tested are austenitic stainless steels (i.e., SUS304; in the Japanese Industrial S…
The process of fabricating Cu layers by displacement reaction is demonstrated. In our experiments, Ti was used and displaced in the chemical reaction process to form copper films. TiN was also adopted to improve adhesion between the copper and the dielectric layer. The effects of the process recipe on the structure an…
Indium tin oxide (ITO) thin films were deposited on polyethylene terephthalate (PET) substrates at room temperature by RF magnetron sputtering with a new technique, called gas-timing. The influence of RF power on properties of ITO thin films was investigated. From the x-ray diffraction measurement of the ITO thin film…
Amounts of crystalline phases of airborne particulates collected on a silicon wafer (10 x 10 mm) using a high-volume air sampler were analyzed by grazing incidence X-ray diffractometry (GIXD). Airborne particulates were classified into five size ranges (1.09-10.5 microm) with a cascade impactor attached on the samplin…