Materials Literature
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The dielectric permittivity of PMN single crystal was measured in the frequency range from 20 Hz to 3 GHz. Dielectric dispersion was observed in all investigated frequency range. From the frequency dependence of the real and imaginary parts of dielectric permittvity, the distribution of relaxation times was calculated…
Abstract This paper concerns the wrought, nickel‐chromium‐molybdenum (Ni‐Cr‐Mo) alloys, a family of materials with a long history of use in the chemical process industries. Their attributes include resistance to the halogen acids and resistance to pitting, crevice attack, and stress corrosion cracking in hot, halide s…
Single crystals of ferroelectric BaTi 2 O 5 were grown by a floating zone method, and the dielectric constant and specific heat were measured in a temperature range of 300–800 K. The dielectric constant and dielectric loss along the b -axis show a large dielectric dispersion at T C =730 K, similar to the ferroelectric…
Abstract Polymer/liquid‐crystal (LC) tubes consisting of an approximately 30 nm thick poly(methyl methacrylate) (PMMA) layer on the outside and a 5 to 10 nm thick discotic liquid‐crystalline layer on the inside of the tube walls have been prepared by wetting ordered porous alumina templates with a pore diameter of 400…
We calculate the current and electrostatic potential drop in metallic carbon nanotube wires self-consistently by solving the Green's function and electrostatics equations in the ballistic case. About one-tenth of the applied voltage drops across the bulk of a nanowire, independent of the lengths considered here. The r…
Abstract Aqueous gel‐like lyotropic liquid crystals with extensive hydrogen bonding and nanoscale hydrophilic compartments have been used to define the growth of macroscopic nanotemplated CdS and CdTe thin films. These mesoporous semiconductor films contain a hexagonal array of 2.5 nm pores, 7 nm center‐to‐center, tha…
Self-assembly of a new precursor [Cu(L)](ClO4)2 (1) (L = macrocyclic ligand) with octacyanometalates [M(CN)8]3- (M = Mo, W) produced two-dimensional cyano-bridged Cu(II)-M(V) bimetallic assemblies [Cu(L)]3n[M(CN)8]2n.6nH2O [M = Mo (2), W (3)] with novel honeycomblike structures, characterized by spectroscopic data, si…
Capacitance aging under DC electric fields has been studied on multilayer ceramic capacitors (MLCCs) with X7R characteristics. The capacitance change with time was divided into two consecutive stages. The first stage was due to the nonlinear permittivity of dielectrics and it should not be involved in the aging phenom…
Abstract Gas (atmosphere) carburizing is the de facto standard by which all other surface hardening techniques are measured and is the emphasis of this chapter. Initially, the chapter describes the process and equipment for gas carburizing. This is followed by sections discussing the processes involved in quenching, h…
Abstract CdS micropheres were prepared by a hydrothermal microemulsion method in cyclohexane/Triton X‐100/pentanol/water at 180 °C. The as‐prepared samples were characterized by X‐ray diffraction analysis, transmission electron microscopy, electron diffraction, energy diffraction X‐ray analysis and photoluminescence s…
Deformation and recrystallization texture has been investigated in Oxygen free high conducting (OFHC) copper wires drawn at room temperature to true strain of 2.31, and isothermally annealed at various temperatures between 150°C and 750°C. Local orientations of the microstructures were measured by means of electron ba…
The phase trajectories of carbon heated in various regimes by a high-power electric current pulse have been theoretically calculated. It is shown that diamond can be synthesized from a liquid phase in the regime of high-energy electric explosion.
The localized corrosion behavior of Alloy 22 (UNS N06022) in acidified (pH = 3) sodium chloride (NaCl) brines at elevated temperature (80°C) and under potentiostatic and open-circuit conditions has been investigated. Both pitting corrosion and intergranular attack are observed on specimens polarized into the transpass…
Self-assembled PbTiO 3 nanoisland structures were fabricated on Pt/SiO 2 /Si at 400°C by metalorganic chemical vapor deposition. The average width and height were 35 and 1.9 nm for PbTiO 3 grown for 10 s, and 35 and 3.6 nm for that grown for 20 s, respectively. In-plane X-ray diffraction showed that PbTiO 3 nanoisland…
Crystallization of sol-gel derived Pb 1−x Ca x TiO 3 powders have been investigated using TG-DTA technique, X-ray diffraction and FT-IR spectroscopy. The thermograms obtained on as fired PbTiO 3 powder showed a dominant exotherm at ∼450°C, and is well supported by X-ray diffraction indicating single-phase formation. W…
Abstract Transition metal complexes of linear and crosslinked styrene‐maleic acid copolymer were prepared in ethyl alcohol. The complexes appear as micro clusters fairly uniformly distributed in the copolymer matrix. Vapor adsorption–desorption studies of the complex beads with methyl isobutyl ketone (MIBK), toluene a…
Abstract Mica-chlorite mixed-layering was identified by X-ray diffraction (XRD) as a major or subordinate constituent in several slates of the Puncoviscana Formation from Sierra de Mojotoro (Eastern Cordillera, NW Argentina). In order to determine the crystallochemical characteristics of these mixed-layered sequences…
The advantages and uniqueness of the Inorganic modification of the Sol-Gel method have already been described. Homogeneous nano-composites as well as some exotic glasses, complex-metal-oxides systems with little glass-forming ability, can be produced by this method. Thus, the obtained materials are characterized by a…
The solid solution of the ferroelectric relaxor (Na 1/2 Bi 1/2 )TiO 3 with BaTiO 3 , (1-x) NBT-x BT (NBT-BT) shows a morphotropic phase boundary with enhanced properties at x = 0.06-0.07. We have prepared targets.of (1-x) NBT-x BT with x = 0.06 by solid state reaction and sintering at 1200°C, up to a final relative de…
The primary thermogram of the bamboo fibers belonging to the species Dendrocalamus strictus is recorded in an inert atmosphere at a heating rate of 10 C/min. Using this thermogram and its derivative, initial and final degradation temperatures and inflection points are found. Using the Freeman and Carroll method, the k…