Materials Literature
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Conditioning behavior of surface flashover strength of a large-bandgap insulator (quartz) is investigated with the aid of streak photography in conjunction with electrical (voltage and current) and optical UV (phototube) diagnostics. The breakdown strength of the sample is found to be conditioned during the initial te…
Article Crystal structure of tetrapotassium hexaselenodistannate, K4Sn2Se6 was published on June 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 203, issue 1-2).
Several technologies have been reported for the synthesis of AlN. These are reviewed and described in detail. The processes are classified according to the principle of synthesis, and the AlN product characteristics for each method of synthesis are identified. Only two of the methods reported, direct nitridation and c…
The study of poorly crystallized compounds by X-ray powder diffraction is sometimes very difficult because structural information is not easily obtained. One way to determine these structural data is to test more or less complex crystallographic models and compare simulated wide-angle X-ray scattering (WAXS) and small…
The phase diagram for the ternary system MgO─P 2 O 5 ─H 2 O at 25°C has been constructed. The magnesium phosphates represented are Mg(H 2 PO 4 ) 2 · n H 2 O ( n = 4, 2, 0), MgHPO 4 ·3H 2 O, and Mg 3 (PO 4 ) 2 · m H 2 O ( m = 8, 22). Because of the large differences in the solubilities of these compounds, the technique…
Ellipsometric spectra of polyaniline which is one kind of new conducting polymers are measured. The complex dielectric function, the index of refraction and the absorption coefficient of insulating polyaniline as the functions of photon energy are obtained. The absorption spectra obtained by us and other authors are c…
Specimens of an aromatic polyamide (Aramid) paper, which were subjected to various degrees of moisture adsorption as well as water immersion, were investigated in order to estimate how much the adsorbed moisture and the stored water affect the dielectric and thermoanalytical behavior. In the humid specimens the dielec…
Due to its high crystallinity and purity, hydrothermal powder was used to study the effects of grain size and density on the dielectric properties of BaTiO3. Curie-Weiss analysis was used to analyze the results as porosity increased. A correlation was found between the level of porosity and the difference between the…
The NOx composition and iodine species in the dissolution of spent fuels are discussed on the basis of thermochemical calculations and experimental results. The influence of N0x sparging on the expulsion of iodine is also discussed. The dissolution of a spent PWR-fuel specimen (–3g) in 30 ml of 3.5MHNO3 at 100°C is ca…
Abstract Several tricyclo[5.3.1.01,5]undec-9-ene-8,11-diones have been synthesized in stereospecific manner, by using electrochemical oxidation of the corresponding phenols with trans or cis para-halo substituted styryl group. Two of the products were subjected to base-catalyzed fragmentation reaction to afford two di…
Discharges in model capacitors made of polypropylene impregnated with an organic liquid are studied with a digital analyzer. The effect of the nature of the liquid (aliphatic or aromatic hydrocarbon) and the influence of parameters such as voltage, pressure and temperature on the main characteristics of the discharges…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural investigations of urea-aliphatic polyester adductsAbdellatif Chenite and Francois BrisseCite this: Macromolecules 1993, 26, 12, 3055–3061Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https://pubs.ac…
A new chiral organic acid, 2(S)-[2(S)-methylbutoxy]propionic acid (2), was synthesized from ethyl lactate and (S)-1-iodo-2-methylbutane. The acid 2 containing two centres of chirality was used as a building block for preparing ferroelectric liquid crystals. Three series of chiral compounds were synthesized to study th…
Abstract Na-poor, Fe-bearing high sanidine from a lamproite near Cancarix (Spain) has 2Vα‖(010) = 37-43° and C2/m, a = 8.598(15), b = 13.050(26), c = 7.209(17) Å, β = 116.00(18)° V = 727(2) Å 3 . Rims of sanidine crystals against vugs contain up to 60 mole % KFeSi 3 O 8 and up to 10 at.% Si and 6 at.% K above the stoi…
We have grown high quality La0.5Sr0.5CoO3 thin films by Pulsed Laser Deposition. This material is a electrically conducting perovskite which can be used as structurally compatible electrodes for devices using ferroelectric materials such as Pb-La-Zr-Ti-O (PLZT). Oxygen stability was investigated under various annealin…
Nitrogen mineralization properties of major soils in the Tokachi district of Hokkaido in northern Japan were investigated by the kinetic analytical method. Soil samples collected in spring and autumn from plots with tillage experiments consisting of a Brown Andosol (U.S. Soil Taxonomy: Typic Hapludands) and Gleyic Cum…
The annihilation characteristics of positrons in vitreous silica glasses (v-SiO 2 ) were studied by measurements of two-dimensional angular correlation of positron annihilation radiations and positron lifetime spectra. From the measurements, it was found that positrons and positronium (Ps) atoms mainly annihilate from…
Sartorite, PbAs 2 S 4 , has been examined by transmission electron microscopy. The mineral has a monoclinic (but metrically orthorhombic) subcell with a=19.62, b=7.89, c=4.19A, β=90°, and space group P2 1 /n. In addition to the strong substructure reflections, G, corresponding to this monoclinic subcell, it also exhib…
The structure of {1101} twin dislocations in Ti films evaporated on NaCl substrates at 250°C has been examined and characterized by high-resolution transmission electron microscopy. The results have revealed that a twin dislocation structure with a step height 4d(K1), where d(K1) is the spacing of the {1101} twin plan…
A comparative study of the treatment of polytetrafluoroethylene (PTFE) and poly(vinyl fluoride) (PVF) with “Tetra-Etch” has been carried out. The treatment of PTFE resulted in extensive changes in surface chemistry and topography, whereas with PVF there was no significant change in topography and the chemical changes…