Materials Literature
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A new compound containing polyoxovanadoborate anion was synthesized and characterized by single-crystal X-ray diffraction analysis. A water molecule at the center of the anion was precisely determined. The crystals of the new compound belong to the monoclinic system, space group P21/n with a=1.35002(7), b=2.0864(1), c…
Interactions of cationic FeTMPyP with ionic and nonionic micelles have been studied by optical absorption, resonance light scattering (RLS) and 1 H NMR spectroscopies. The equilibrium behavior of FeTMPyP as a function of pH is described by several species in aqueous solution. The presence of phosphate anions leads to…
An electroactive polynuclear inorganic compound of rare earth metal hexacyanoferrate, lanthanum hexacyanoferrate (LaHCF), was prepared by electrochemical deposition on the surface of a glassy carbon electrode with a potential cycling procedure. The cyclic voltammogram of LaHCF exhibits a pair of well-defined redox pea…
Photoconductivity measurements of amorphous selenium (a-Se) and arsenic selenide (a-As 2 Se 3 ) were carried out. Samples where annealed from 333–358 K at 5 K step for 5 minutes and the photoconductivity was measured after each annealing step. It was found that the dark current increases permanently for a-Se and the p…
The effects of ionic size in octahedral and two kinds of tetrahedral sites (M, T1, and T2) on the thermal expansion of cordierite were systematically investigated by means of molecular dynamics simulations. Thermal expansion along the a axis could be controlled by varying the ionic size in the M‐site, and expansion al…
Low coherence optical interferometry (D. Huang et al., Science 254, 1178 (1991) [1]) has been proven to be an effective tool for characterisation of thin and ultra-thin semiconductor Si wafers (W. J. Walecki et al., 3rd International Workshop on Thin Semiconductor Devices – Manufacturing and Applications, Munich, Germ…
Abstract Naldrettite, Pd 2 Sb, is a new intermetallic mineral discovered in the Mesamax Northwest deposit, Cape Smith fold belt, Ungava region, northern Québec. It is associated with monoclinic pyrrhotite, pentlandite, chalcopyrite, galena, sphalerite, cobaltite, clinochlore, magnetite, sudburyite (PdSb), electrum and…
Consistent hydrodynamical models for electron transport in semiconductors. free of any fitting parameter, have been formulated on the basis of the maximum entropy principle in Continuum Mech. Thermodyn., 11 (1999) 307, 12(2000) 31 for silicon and in Continuum Mech. Thermodyn., 14 (2002) 405 for GaAs. In this paper we…
Undoped fluoride glass slides have been exposed to pulsed 193-nm ultraviolet (UV) irradiation. Their absorption changes have been measured to evaluate UV-induced index changes using Kramers-Kronig relation. A layer-peeling polishing technique was applied to characterize the local UV-induced index change of highly abso…
The patterning of single-stranded DNA with a pattern period of 63 nm and a pattern diameter of 40 nm is successfully demonstrated using a gold disk array formed on a highly ordered anodic porous alumina substrate. The formation of DNA patterns is confirmed indirectly by observation of adsorbed streptavidin-coated coll…
The composition Zn 2.33 Sb 0.67 O 4 (or Zn 7 Sb 2 O 12 ) exists in two polymorphic forms. The thermodynamically stable, low‐temperature orthorhombic β form transforms to the high‐temperature cubic α‐polymorph with a spinel structure at 1225°±25°C. The transformation is fully reversible but slower in the α→β direction…
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…