Materials Literature
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Zeolite A (NH4-A) exchanged with NH4+ was used as a precursor of mullite. NH4-A was dehydrated and deammoniated by heating up to 300°C and it entered an amorphous state. Mullite crystallized directly from the amorphous phase at above 950°C without forming a spinel phase as an intermediate phase. Since the starting mat…
The fine particles of yttrium oxide containing europium are very important for the fabrication of red phosphor. In this study, the synthesis of the fine monodispersed particles containing yttrium and europium from the homogeneous solution using urea as a precipitant generator was investigated. The obtained precipitate…
Abstract The phase diagram of the model of spinless fermions with repulsive nearest neighbour interaction is calculated analytically on a hypercubic lattice in infinite dimensions ( d → ∞). In spite of its simplicity the model displays a rich phase diagram depending on the doping δ, the interaction U and the temperatu…
Two basic mechanisms which operate in the functioning of reactive armour are presented. Both the explosive effect and cutting of metal plates by a jet have been investigated. The angle of attack and the confinement of the explosive have been found most significant factors in reducing the penetrating power of the jet.…
The wettability of glass, carbon, and organic fillers (in the form of fibres or fabrics) by powder thermoplastic polymers has been studied. Wettability is the first step in the interaction between the components, a necessary condition for forming an interface, so as to achieve high levels of physico-mechanical propert…
Comparisons of the magnetoelastic responses of the highly magnetostrictive compound Terfenol-D (Tb/sub 0.3/Dy/sub 0.7/Fe/sub 1.95/) with aluminium substituted compounds Tb/sub 0.3/Dy(Fe/sub 1-x/Al/sub x/)/sub 1.95/ where 0.05/spl les//spl times//spl les/0.10 in the temperature range 20-300/spl deg/C have been made. In…
The polymerization of hydroxyalkylacetylenes [HC°C(CH2)n-OH, n = 1–4) was carried out with various transition metal catalysts. Mo-based catalysts and PdCl2 were very effective for the polymerization of hydroxyalkylacetylenes. The polymer yields generally decreased as the number of methylene units between the hydroxy a…
Abstract The catalytic activity of binary oxides of Al2O3–Eu2O3, Al2O3–Sm2O3, Al2O3–Nd2O3, Al2O3–Pr6O11, and Al2O3–Y2O3 were checked in the transformations of α and β-pinene oxides. Al2O3–Eu2O3 and Al2O3–Nd2O3 are found to be best catalysts for α-pinene oxide isomeriztion. Among the oxiranes, α-pinene oxide showed mor…
Nickel-containing zirconia samples (Ni⩽16.85%), prepared by contacting hydrous zirconium oxide with an Ni2+ solution to a given pH were studied by various techniques (XRD, DTA, TG, XPS) to investigate the incorporation of Ni2+ in the zirconia structure in relation to the dispersion degree of the transition-metal ions.…
Local structures around Si, Ca, Mg, Co, and Ni atoms in CaMgSi2O6, CaCoSi2O6, and CaNiSi2O6 glasses were investigated by X-ray diffraction, XAFS, and optical absorption spectra measurements. Si–O interatomic distances of these three glasses are 1.62 Å and coordination numbers of Si atoms are 4. Mg–O, Co–O, and Ni–O in…
Abstract The general theory of a third‐order generalized photoconductivity in glass is developed using a density matrix approach in the generalized master equation approximation. The theory is applied to third‐order photogalvanic effect in glass in connection with photoinduced second‐harmonic generation in silica.
A new analysis of the ligand-field stabilization energy which allows for contributions from the nephelauxetic effect, is shown to give satisfactory results for solid dihalides of the first transition series. In agreement with the nephelauxetic series, this contribution increases with the size of the halide ligand, and…
tert-Butyl-substituted vanadocene, (C5H4CMe3)2V (1), is used as a precursor in the CVD preparation (740 °C under hydrogen at atmospheric pressure on steel substrates) of crystalline VC0.88 thin films, characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) a…
Abstract An ARC TM or similar experimental apparatus provides the transient temperature history of a chemical system under adiabatic conditions. The information obtained has several applications in the design and operation of industrial systems. Of particular interest is use of the adiabatic kinetic data to define “in…
This paper describes a new magnetic device consisting of a 12 mm/spl times/12 mm planar magnetic path-type transformer utilizing a parametric oscillation. The device is formed from a stack of 50% Ni-Fe laminations or Fe/sub 3/Co/sub 70/Si/sub 15/B/sub 10/ laminations, and is composed of magnetic paths with three legs…
Abstract A millable polyurethane prepared from castor oil was blended with natural rubber in a two‐roll mill and sulfur‐cured. It was observed that blending of more than 50/50 (by weight) of the polyurethane with natural rubber was not feasible. Blends were found to have improved tensile modulus and abrasion resistanc…
The misfit layer compounds (MX)(1+x)(TX(2))(m) (with M = Sn, Pb; T = Ti, Nb; X = S, Se; 0.08
The purpose of this study is to develop a void fraction correlation based on the void data measured by an X-ray CT scanner. The tests were carried out in an out-of-pile test facility that can simulate the high pressure and high temperature conditions of BWRS. An electrically heated test assembly simulated a BWR fuel a…
Influence of residual porosity on the flexural strength and fracture toughness of pressureless-sintered α-SiC ceramic with controlled microstructure, characterized by equiaxed-grain and a mixture of equiaxed/plate grains were investigated together with the trend of σ-KIC behavior. Both the flexural strength and the fr…
The Si-Ti-C-O fiber (STC (6)) with a low oxygen content of 6mass% was oxidized at temperatures in the range of 1273 to 1773K in order to measure its oxidation rate and thereby to elucidate its oxidation behavior. These results were compared to those of the commercial fibers having 18 and 13mass% O (STC (18) and STC (1…