Materials Literature
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Whereas oxidation of 1-naphthols with Fremy's salt often affords significant amounts of the corresponding 1,2-naphthoquinone dye-sensitised photo-oxidation gives exclusively the 1,4-naphthoquinone via the addition of singlet oxygen to the naphthalene ring.
Two kinds of phase transitions are considered in the perovskite structure which involve instabilities located either at the Brillouin zone center (ferroelectric transition) or at the zone corners (antiferrodistortive transition). X-ray diffuse scattering and neutron inelastic scattering results are discussed. The stee…
The study of transient voltages in transformer windings has aroused interest recently with the presentation of more efficient methods of modelling. This paper presents a method of modelling the magnetic field of an air-core disk winding which has sections lumped together. Past methods have proved to be cumbersome and…
A single crystal of an Fe‐30wt%Cr‐23wt%Co−1wt%Si alloy was prepared by a recrystallization process.The magnetic properties of <100≳, <110≳ and <111≳ single crystals were measured after the following heat treatment. The crystals were solution‐treated at 1300°C for 30 min and then quenched into water. They were tempered…
Kinematical diffraction from a crystal having planar faults is described by a systematic writing of the Patterson function and its Fourier transform for the general case of an arbitrary number of different kinds of layer, describing the faults in terms of a fault vector plus an addition, or subtraction, of scattering…
This paper reports the results of an experimental investigation of the static field anode corona characteristics in SF6over a wide range of gas pressures and field non-uniformities. In addition to the experimental study the theoretical streamer onset voltages of the various test gap geometry-pressure configurations we…
The influence of Co-60 gamma-irradiation, up to 500 Mrad, on the kinetics of the thermal decomposition of lithium perchlorate has been studied over the temperature range 400–440°C. The material (m.p. 236°C) decomposes in the molten state and the lithium chloride formed remains dissolved initially but separates out as…
The Hall effect in the organic charge transfer compound HMTSeF-TCNQ was measured as function of temperature and pressure. The Hall constant indicates metallic behaviour near ambient temperature, and semi-metallic behaviour at low temperatures, with approximately one carrier per 500-1000 formula units. The Hall constan…
The interaction of tungsten hexachloride and trimethylaluminium in a hydrocarbon solvent followed by removal of chlorodimethylaluminium with an amine allows the synthesis of multigram quantities of hexamethyltungsten.Interaction of WMe6 with an excess of methyl-lithium in diethyl ether produces the anion [WMe8]2– whic…
Description An excellent state-of-the-art book containing seven papers that treat a variety of wear test problems and techniques.
Treatment of oxotitaniumocthylporphyrin with benzoyl peroxide leads to a complex which is shown to have a peroxo-bonding structure by X-ray diffraction; the oxygen atoms of the dioxygen are both bonded to the metal.
Abstract Two surface analysis techniques (Rutherford backscattering and surface composition by analysis of neutral and ion impact radiation) have been applied to the study of interfacial copper transport in the oxidation of polyethylene films over copper surfaces. Analysis of films oxidized several thousand hours at 4…
The crystal structure of rankinite (Ca3Si2O7) was refined to an R value of 0.033 by full matrix least-squares using 1492 three-dimensional counter-measured intensity data. The crystal is monoclinic, P21⁄a, with a=10.557(1) Å, b=8.885(3) Å, c=7.858(1) Å, β=119.586(6)°, Z=4. The coordination polyhedra of calcium atoms f…
Measurements of radius of gyration, <S2>½and persistence length of polymer molecules in bulk atactic polystyrene have been made by low-angle neutron scattering (LANS) from dilute solutions of protonated polystyrene (PSH) in a deuterated polystyrene (PSD) matrix. The measured values of <S2>½ lie close to those measured…
The crystal structures of Ag2Mo2O7(I) and Ag2W2O7(II) have been determined by single-crystal X-ray analysis. Both compounds crystallize in space group P, Z= 2, with for (I): a= 6.095(3), b= 7.501(3), c= 7.681(3)Å, α= 110.4(1), β= 93.3(1), γ= 113.5(1)°; and for (II): a = 6.033(3), b= 7.051 (3), c= 7.735(3)Å, α= 73.8(1)…
In a systematic study of galvanic corrosion of aluminum alloys the effects of the dissimilar metal, the solution composition, and area ratio have been evaluated using galvanic current and weight loss measurements. In 3.5 percent sodium chloride, galvanic corrosion rates of the aluminum alloys 1100, 2024, 2219, 6061, a…
any other treatment of the COMBABILITY of HUMAN HAIR has been developed. The required instrumentation, experimental procedure, and interpretation of the data are presented in detail. The method involves the continuous recording of the forces, which oppose the motion of a comb through a swatch of hair. The data thus pr…
The solubility of the three paraffins octacosane, dotriacontane and hexatriacontane in each of the two solvents pentane and heptane have been measured in the temperature interval 10–35°C. The results follow with high accuracy a relation of the form lnx2=ΔSd/R–ΔHd/RT. The values of the parameters ΔHd and ΔSd involved i…
Dityrosine was formed by the action of peracetic acid and sodium peroxide on soluble collagens. Dityrosine was also detected in native insoluble collagen, but only from old animals. Dityrosine was identified by amino acid analysis, fluorescence absorption and mass spectra.
The crystal structure of cubic CsPbCl 3 was reinvestigated by neutron diffraction technique at 55°C. Two structure models were examined: (i) perovskite structure with anisotropic thermal vibration and (ii) disordered structure having several potential minima for the Cs and Cl atoms, originally proposed by Møller (1959…