Materials Literature
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Electron field emission calculations on atomic-size microtips are presented. Models inorporating the atomic size and the particular geometrical shape of the tip are proposed. Theoretical analysis explain the remarkable properties observed experimentally : strong electron beam focusing and anomalous I-V characteristics…
The symmetry modes transforming according to the irreducible representations of the little superspace group of the wave vector characterizing the incommensurate-to-incommensurate phase transition in ${\mathrm{NbTe}}_{4}$ are derived. Some of these modes are considered as possible order parameters, and possible Landau…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic study of the formation of the oxo diperoxo complex of tungsten(VI) in aqueous perchloric acid solutionM. Ashraf Islam and Richard C. ThompsonCite this: Inorg. Chem. 1989, 28, 24, 4419–4422Publication Date (Print):November 1, 1989Publication History Published online1…
Computer programs have been written which plot high accuracy trajectory paths for electrons through irregular finite-element meshes. The technique used to achieve this revolves around mapping irregular regions onto a normalized plane, where the usual operations of locating the electron’s position and interpolating for…
The NLH. has two high velocity burner rigs for oxidation and hot corrosion testing. A large, custom-built rig was commissioned in 1977 to enable actual components to be tested. A smaller rig for specimen testing was purchased in 1986. Experience with these rigs over the last decade is reviewed.
Electrical and optical properties, especially the photoconductive ones, of an elemental black phosphorus semiconductor have been investigated. It has been found that the black phosphorus crystal shows photoconductive properties in the near-IR region. It shows a linear response for light intensity, a fast response with…
Crystals of Ca 2 SiO 4 doped with K, P, Al, and Fe were grown and examined by means of both X‐ray and electronbeam diffraction. They are made up of domains 120° different in orientation around the c axis of the previous α phase. Each of the domains gives an orthorhombic superstructure whose cell is incommensurate with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of the Zintl phase potassium silicon arsenide, K2SiAs2Weir Mirn Hurng, Eric S. Peterson, and John D. CorbettCite this: Inorg. Chem. 1989, 28, 22, 4177–4180Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published…
The dielectric constant of undoped, polycrystalline barium titanate in the paraelectric phase was obtained from the complex impedance plane representation in the 180–400°C temperature range, between 5 Hz and 13 MHz. A Curie-Weiss behavior is observed, with a Curie constant C o = 10.48 × 104 (K). These results are disc…
The internal production of helium gas and point defects in neutron-irradiated boron carbide causes a significant swelling, the size of which is roughly linear with the irradiation dose and weakly temperature dependent when the irradiation temperature is lower than 1500°C. Extensive intergranular and intragranular micr…
This report presents a comprehensive literature review of the toxicity of the combustion products of flexible polyurethane foam and the thermal decomposition products of this polymer. Combustion toxicity results obtained using different test methods but measuring the same toxicologic endpoints were compared. That is,…
The corrosion behavior of mild steel (SS 41 [UNS(1) K02600]) and ferritic stainless steels (type 430 [UNS S43000], type 444 [UNS S44400]) in oxalic acid solutions was investigated by corrosion weight loss, DC polarization, and natural electrode potential (NEP) variations with time. The surfaces of the specimens were o…
The thermoluminescence (TL) glow curves of γ-irradiated magnesium phosphate glass sample have been studied for dosimetric purpose in the dose range from 2.5 to 120 Gy. The resulted glow curves have exhibited two peaks whose positions were dependent on heating rate. The intensity of the glow peaks was found to be dose…
Porous anodic alumina films grown in sulfuric acid and similar specimens sealed in nickel acetate and dichromate sealing baths were subjected to a number of surface and bulk analytical techniques (XPS, RBS, SIMS, and XRD). All the oxide films were found to be amorphous‐like in nature, to contain significant amounts of…
The thickness of gold thin films of 0.1–100 nm on Si substrates has been measured with an electron probe microanalyzer. The analysis process is as follows. k ratio versus thickness calibration curves are produced through use of a Monte Carlo simulation of electron scattering based on the Mott cross sections for elasti…
Mineralogical and geochemical analyses of alteration products from upper and lower volcanic series recovered dur ing ODP Leg 104 reveal variations both in composition and order of crystallization of clay minerals vesicles and voids filling and replacing glass. These results provide information about successive alterat…
Several new structures are proposed as tests of a general model for the design of ferromagnetic polymers.
Abstract It can be shown both theoretically and experimentally that calcium carbonate forms during the titration of polycarboxylates by calcium with carbonate as the indicator, and that the calcium carbonate is dispersed by the polycarboxylate. If the dispersing capacity of the polymer exceeds the level of calcium car…
The colourless compounds Li 3 OBr and Li 7 O 2 Br 3 have been prepared and characterized by X-ray diffraction techniques. Li 3 OBr crystallizes in a cubic primitive lattice (Pm3m) with a = 405.6(1) pm (Z = 1). The structure is related to the anti-perovskite type. Li 7 O 2 Br 3 crystallizes in a tetragonal bodycentered…
An experimental study is reported of solidification of ammonium chloride-water solutions inside a rectangular enclosure. The phase-change and convection processes are studied through shadowgraph and flow visualization as well as temperature and concentration measurements. A number of different initial and boundary con…