Materials Literature
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Corrosion is one of the degrading mechanisms that greatly affect the structural integrity of aerospace components. Corrosion begins with small imperfections in the given material referred to as "pits". Over time, and with exposure to the environment and loading stresses, these pits grow into structural cracks. These c…
The investigations of the ultrasonic decomposition of NH3-N and organic compounds (i.e., CODCr) in coke plant wastewater are presented in this work. The process parameters were controlled with respect to the presence (or absence) of air atmosphere, initial pH value, initial concentration, and ultrasonic power density…
The electrical resistivity (ρ), resistive thermal coefficient (α r ), thermal expansion coefficient (α t ) and stress (σ) of Al and Au thin films deposited by thermal evaporation were measured while films were heated by Joule effect. Electrical resistivity measured by the four-probe technique was simultaneously measur…
The size dependence on the switching properties of microstructured Permalloy (Ni/sub 80/Fe/sub 20/) ellipses were investigated by magnetoresistance measurements and magnetic force microscopy. Elements with fixed short axes of 1 /spl mu/m, long axes varying from 2 to 10 /spl mu/m, and film thickness varying from 8 to 5…
Electrically controllable liquid-crystal (LC) microlens arrays have been fabricated using the process of anisotropic phase separation of the LC from its solution in a ultraviolet curable prepolymer. The focal length of nematic LC-based microlens arrays can be changed in milliseconds with an applied electric field. The…
Partial discharge (PD) inception characteristics of liquid nitrogen (LN2)/polypropylene (PP) laminated paper composite insulation system for high temperature superconducting (HTS) cables were investigated in terms of the volume effect and the V-t characteristics. The electrical and optical measurements of PD inception…
The effect of Sr substitution in Y‐type hexagonal ferrite of composition Ba 2– x Sr x Zn 1.2 Co 0.4 Cu 0.4 Fe 12 O 22 was investigated. x varied from 0 to 2.0. The samples were prepared by the solid‐state reaction method. Phase formation was characterized by powder X‐ray diffraction. The microstructure was observed vi…
Original investigations of structural properties in noncrystalline solid N-methylformamide (HCONHCH(3)) are presented in this paper. After description of the sample preparation, the elastic neutron scattering formalism is applied to deduce the coherent scattering cross section for amorphous N-methylformamide. The cont…
The Zn‐substituted planar hexaferrite Ba 3 Co 2− x Zn x Fe 24 O 41 ( x =0–1.2) powders were prepared via a citrate precursor method. With an appropriate sintering aid, ceramics with high density could be obtained after sintering at a temperature of less than 900°C. These ceramics exhibit excellent high‐frequency prope…
CdO thin films have been grown on a-plane (110), c-plane (0001), r-plane (012) and m-plane (100) sapphire substrates by metalorganic vapour-phase epitaxy (MOVPE). The effects of different substrate orientations on the structural properties of the films have been analyzed by means of X-ray diffraction, including θ-2θ s…
Abstract Kristalle der Seltenerdvanadate(V) SE VO 4 ( SE = Y, La, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho) sowie ausgewählte Mischkristalle wurden durch endothermen chemischen Transport mit TeCl 4 als Transportmittel erhalten. Die Untersuchung zur Zusammensetzung der Gasphase erfolgte massenspektrometrisch. Für NdVO 4 und TbVO…
Abstract Faceting and migration of twin tips in slightly deformed Zn [112¯0] flat single crystals have been investigated. The stationary shape of the slowly migrating tip of the twin plate has been studied, and the migration rate has been measured between 592 and 692 K in situ using polarized light. Below 632 and abov…
The early stage of phase separation in aluminoborosilicate glass for liquid crystal display substrates was investigated using a scanning electron microscope (SEM) and small‐angle X‐ray scattering measurement device (SAXS). The phase‐separated particles were detected with SAXS in samples in which no particle was observ…
Cobalt hexacyanoferrate (CoHCF) nanoparticles, with an average size of less than 50 nm for individual crystallite, were synthesized by simply mixing appropriate reactants in the absence of surfactant or template. Elemental analysis provided a stoichiometric formula, K0.2Co1.4[Fe(CN)6]·xH2O for this compound. The invol…
It is commonly accepted that water trees can be initiated and developed within insulation by the simultaneous action of moisture and alternating electric field. Despite the appreciable achievements and extensive works in the field of water treeing, there is no definite mechanism explaining its initiation and developme…
Grain growth kinetics of mullite in laboratory‐produced and commercial (3M‐Nextel 720) alumino silicate fibers was analyzed in the temperature range between 1500° and 1700°C. The lab fibers consist of mullite plus traces of α‐alumina, while the phase content of the commercial Nextel 720 fibers is about 60 wt% mullite…
The life expressions of models of insulation aging are functions of temperature and field as well as material parameters. A methodology is presented that allows these models to be applied to a cable geometry in which there is a radial variation of both field and temperature. In this way material parameters can be extr…
The formation and application of nanoscale materials is revolutionising many industrial sectors. The unique properties and functionality offered at this length scale are attractive and the demand for new materials and new production routes is high. This challenging field of research incorporates materials science, eng…
Abstract Orthorhombic Tb 3 O 2 Cl[SeO 3 ] 2 (Pnma; a = 535.16(4), b = 1530.51(9), c = 1081.72(7) pm; Z = 4) is formed by reacting a stoichiometric mixture of Tb 4 O 7 , Tb, TbCl 3 , and SeO 2 in a suitable molar ratio (12 : 8 : 7 : 42) within seven days in an evacuated sealed silica tube at 850 °C. The needle‐shaped,…
We describe high-efficiency, high-dispersion reflection gratings fabricated in bulk fused silica illuminated by incident lights in the C + L bands as (de)multiplexers for dense wavelength division multiplexing (DWDM) application. Based on the phenomenon of total internal reflection, gratings with optimized profile par…