Materials Literature
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The influence of SiO 2 addition on the densification and microstructural development of high‐purity Si 3 N 4 during hot isostatic pressing (HIP) was studied. During HIP, densification was promoted, but the phase transformation from α ‐Si 3 N 4 to β ‐Si 3 N 4 was impeded by SiO 2 . Analysis using a simple model shows t…
The compounds Sr8[Al12O24]S2 and Ca8[Al12O24]S2 have been prepared by reduction of the corresponding sulfate materials, M64[Al96O192]·(SO4)16via an intra-cage reaction. The materials crystallise with the simple body-centred cubic sodalite structure. Profile refinement of powder X-ray data has been undertaken showing a…
Monobloc type durable rolls of over 10000 kg have been developed by ingot metallurgy for hot rolling mills, and the metallurgy and the manufacturing process of the roll are described. The microstructure of the roll consists of hard primary carbides, mainly vanadium rich MC, embedded in the highly tempered matrix. The…
Energy-filtering transmission electron microscopy (EFTEM) with an imaging filter lens can combine the modes of electron spectroscopic imaging (ESI) and electron spectroscopic diffrac- tion (ESD), and different modes can be used to record an electron energy-loss spectrum (EELS). Therefore, an EFTEM can make full use of…
Three different binary systems (two anionic/nonionic and one anionic/amphoteric) were selected to study the behavior of these mixtures in their diffusion through a collagen film and the formation of micelle aggregates in such systems. The inhibition observed in the surfactant diffusion of anionic/nonionic and anionic/…
The alkali metal thermal‐to‐electric converter (AMTEC) converts heat energy to electrical energy with efficiencies up to 3 to 4 times the state of the art static converters. However, the high current, low voltage output of a single module requires difficult series connecting of cells, and several life limiting concern…
The trapping of electrons in localized states in polystyrene has been studied by means of an electron beam technique. A 2.2-kV beam is used to inject a short pulse of charge into the free surface of a thin film of the polymer, and a second electron beam monitors the surface potential of the film. The surface potential…
The hitherto doubtful tubular mesomorphism of 1a has been confirmed by X-ray diffraction experiments on a mixture of the mesophase of 1a with the mesophase of its Br-substituted analogue 1b.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBoron nitride fibers processed from poly(borazinylamine) solutionsDavid A. Lindquist, Jerzy F. Janik, Abhaya K. Datye, Robert T. Paine, and J. Bruce RothmanCite this: Chem. Mater. 1992, 4, 1, 17–19Publication Date (Print):January 1, 1992Publication History Published online1…
The effects of reannealing on the depolarization and phase transition behaviors of poled ferroelectric copolymer film of P(VDF–TrFE) (75/25) are studied by using differential scanning calorimetry (DSC) and piezoelectric resonance techniques from a viewpoint of formation of ferroelectric domains. It is found that the D…
Infrared transmission and Raman spectra of siloxene (Si 6 O 3 H 6 ) and porous Si have been analyzed in terms of the structural composition. Siloxene consists of Si 6 -rings interconnected by oxygen and terminated by hydrogen, and corrugated Si(111)-planes saturated by OH and H. The pronounced photoluminescence of sil…
Precipitation process and microstructures of both Mg-5%Y and Mg-10%Y (in mass%) alloys were investigated using hardness measurement, optical microscopy and transmission electron microscopy. In a Mg-5%Y alloy hardness increased slightly by about HV 10 with aging time at temperatures between 423 and 523K. In a Mg-10%Y a…
The crystal structures of (NEt4)2[FeII(o-pabt)4](o-pabt =o-pivaloylaminobenzenethiolato) and (NEt4)2[CoII(o-pabt)4] show the presence of NH ⋯ S hydrogen bonds which contribute to the positive shift of redox potential and the through-bonding isotropic-contact shift.
Amorphous silica structures which are a few nanometres in width and tens of nanometres in length are seen to become unstable under intense electron irradiation against plastic deformation, necking and failure. Similarly irradiated atomistically sharp tips, which are observed to be stable in crystalline materials, unde…
The electrical transport properties of cation-exchanged MxV2O5·yH2O (M = Al, Li, Zn, Ni, Na, Ag, H3O, K, Ba and Cs) xerogels have been studied in a broad frequency range 1 KHz–10 GHz between 190 and 300 K. In the low-frequency domain (1–100 kHz), the ionic conductivity has been obtained by the a.c. admittance method w…
The KESF system, which was developed for the objective measurement of fabric handle, provided precise measurements of fabric mechanical properties in the low-load range, which was enough to apply them to tailoring process control. The joint research of the present authors began in 1975 with the accumulation of a datab…
Recent studies on the martensitic transformations by precise crystal-structural analyses have been reviewed. Crystal structures of the B19′ and ζ′2 martensites in Ti–Ni and Au–Cd alloys, respectively, which had been controversial for a long time because of their complexity, and the γ′1 and γ′2 martensites in Cu–Al–Ni…
In order to establish a method for estimation of the wetting of ceramics accompanied by interfacial reaction, the authors’ previous work has been rearranged. The wetting was estimated using meniscography and an improved sessile drop method both of which were devised to measure the wetting from the initial contact. Usi…
The conceptual and mathematical difficulties associated with contact angle equilibrium are reviewed and analyzed. The main discussion is centered around the theory of the intrinsic contact angle and its dependence on the three-phase mutual interactions in the vicinity of the contact line. Rigorous thermodynamic deriva…
The quasistationary phase field model equations depending on the small parameter are considered. It is proved that these equations possess a family of the solutions, which converge to the solutions of the Stefan problem with surface tension as the small parameter tends to zero.