General aspects of trace analytical methods: Part VI. Trace analysis of semiconductor materials - Part A: Bulk analysis
Abstract
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Magnetic and Mechanical Properties of a 6%V Permalloy as Magnetic Head Materials
The suitability of 6%V Permalloy as magnetic head core materials for use in the digital tape-recording unit of an electronic computer has been investigated with respect to important requirements for the core materials such as effective permeability in a high frequency field, stress-sensitivity in magnetic permeability…
A dynamic lattice dislocation grain boundary sliding mechanism
An analysis of grain boundary sliding is made based on the hypothesis that the rate-limiting process involves, overall, the climb-limited movement along grain boundaries of lattice dislocations, which originate in the grain interiors. Reasonable values are calculated for the contribution of grain boundary sliding to t…
Metal-organic chemical vapour deposition (MOCVD) of compound semiconductors. Part 1.—Optimisation of reactor design for the preparation of ZnSe
Optimisation of the reactor design for the preparation of ZnSe by metal-organic chemical vapour deposition (MOCVD) at atmospheric pressure has been achieved using TiO2‘smoke’ experiments.Formal expressions derived from gas flow dynamics adequately describe the experimental situation in the laminar flow regime and the…
On the Relationship of Thermodynamic and Physical Properties of Polymers With Ice Adhesion
The purpose of this work is to study the relationship of energetic and physical properties of polymetric materials with ice adhesion, and to develop the material to prevent ice adhesion. From various parameters of water and ice, dispersion and hydrogen bond contribution of surface free energy of ice were calculated. U…
Effects of Temperature and Strain Rate on Dynamic Fracture Toughness of Steel
The effect of strain rate and temperature on the dynamic fracture toughness KId and the
Measurements of Permeation of Hydrogen Isotopes through α-Iron by Pressure Modulation and Ion Bombarding
Permeation response of hydrogen and deuterium through α-iron under the condition of pressure modulation was measured to determine the diffusion coefficient which contained no surface effects. The diffusion coefficients of hydrogen isotopes are obtained between 500 and 1000 K.Permeation under hydrogen ion bombardment w…
Surface Treatment and its Influence on Contact Angles of Water Drops Residing on Teflon and Copper
The variation of contact angle of liquid sessile drops on solids has been attributed to roughness (Wenzel2), the static charge effect (Holly,3 Ponter and Yekta-Fard3) and contamination at the solid surface or in the liquid and gaseous phases.
A stable trinuclear mixed (organic)(organo)copper cluster: synthesis and structure of bis(benzoato)(mesity)tricopper(I)
The interaggregate exchange reaction of Cu5Mes5(Mes = C6H2Me3-2,4,6) with Cu4(OBz)4(OBz = O2CPh) in benzene or toluene afforded the trinuclear cluster Cu3Mes(Obz)2(40% yield) with two bridging benzoato groups [Cu–O 1.862 Å(mean); bridged Cu ⋯ Cu 2.888(2)Å]and one bridging, three-centre, two-electron bonded mesityl gro…
Correlation between Thermoluminescence and Radiation Damage in Bismuth Germanate
Thermoluminescence properties of bismuth germanate and their relationship to radiation damage characteristics have been investigated. Thermoluminescence and radiation damage in bismuth germanate display several similar properties including similar responses as a function of radiation dose, similar saturation levels, a…
Structure and reactivity of an unusual tungsten(VI) porphyrin complex having cis oxo and peroxo groups
The structure of W(TPP)(O)(O2)(TPP = tetraphenylporphyrinato) has been shown to have a cis arrangement of oxo and peroxo groups which are eclipsed with respect to the porphyrin nitrogen atoms.
Investigation of amino acid composition in the crystalline region of silk fibroin
Abstract Accurate estimation of amino acids composition has been carried out for hydrolysates of four varieties of Indian silks, viz., Mulberry, Tasar, Eri, and Muga. These studies have revealed that the hydrolysate (hydrofibroin or crystalline region) in the case of Mulberry consists of glycine, alanine, and serine,…
Design, synthesis, and study of novel, thermally depolymerizable polycarbonates
Novel polycarbonates containing tertiary or secondary benzylic diol structure are prepared via their bis-carbonylimidazolide derivatives under phase transfer conditions; these polycarbonates are designed to undergo a near instantaneous depoluymerization to volatile monomeric species when heated to a critical temperatu…
Corrosion of Metals Under Thermal Insulation
Description Provides the latest information on the serious corrosion problems that can occur to thermally insulated plant equipment, tankcage and piping components if the insulation becomes wet and reviews the various control and inspection methods being used and under development
Effect of pollutants on corrosion of copper alloys in sea water: Part 1: Ammonia and chlorine
The results of sea water corrosion tests on five copper alloy heat exchanger materials are presented. The tests were undertaken to determine whether ammonia, commonly present as a pollutant in sea water, would adversely affect their corrosion behaviour. All five alloys proved more susceptible to crevice attack in the…
Nitrogen-15 n.m.r. characterization of bent and linear nitrosyl ligands in the solid state by cross-polarisation magic-angle-spinning spectroscopy of complexes of ruthenium
High-resolution cross-polarisation magic-angle spinning (CP/MAS)15N n.m.r. spectroscopy of solid [RuCl(NO)2(PPh3)2](BF4) shows a large chemical shift anisotropy for the bent as compared with the linear nitrosyl ligand (in contrast to solution 15N n.m.r. which shows a bent–linear ligand fluxionality): in solid [Ru(NO)2…
Shape Memory Effect in an Ordered Fe<SUB>3</SUB>Pt Alloy Associated with the FCC-FCT Thermoelastic Martensite Transformation
Etude experimentale sur un alliage Fe-24,9% at. Pt. Le parametre d'ordre a ete determine par diffraction de rayons X et les temperatures de transformation par mesure de resistance electrique en fonction de la temperature
Mixed-ligand complexes of trivalent lanthanides. Part 3. Complexes of heptafluorodimethyloctane-3,5-dione and pyrazine: syntheses and spectral studies
The lanthanide(III) tris(heptafluorodimethyloctanedionates), [Ln(fod)3], form solid adducts with pyrazine (pyz) resulting in an increase in co-ordination number of the lanthanides from 6 to 7. In these adducts pyrazine co-ordinates through only one of its nitrogen atoms. The praseodymium, europium, and ytterbium adduc…
Hydrothermal growth and the crystal structure of arsenic telluride, As2Te3
Single crystals of As 2 Te 3 were prepared hydrothermally by heating and gradually cooling a mixture of stoichiometric quantities of powdered As and Te in a HCl 25% w/w solution in a quartz ampoule. The crystal structure was determined by using the intensities of 600 independent reflections, measured on a computer con…
Cholesteric and other phases in thermotropic liquid crystalline polymers with side chain mesogenic groups
Abstract