Materials Literature
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Based on the Kirchhoff's hypothesis, a general bending analysis of circular plates for small deflection and axially symmetric loadings and support conditions is developed. The incremental theory of plasticity with von Mises yield condition and associated flow rule has been adopted. The material is assumed to be elasti…
NiO crystals free from twin structure were prepared by annealing at 1650°C in argon atmosphere and either by axially cooling through the Néel temperature with a temperature gradient set along [111] or by applying a stress along [111] at room temperature. Torque measurements were made at various temperatures and in mag…
Accurate lattice parameters of the tetragonal phase of VO 2 have been determined as a function of temperature by X-ray powder method in the temperature range 78°C to 415°C. Both the lattice parameters are found to increase with increasing temperature, the relative increase in the ` c ' parameter being greater than tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrolysis of titanium tetrafluorideYu. A. Buslaev, Daniel S. Dyer, and Ronald O. RagsdaleCite this: Inorg. Chem. 1967, 6, 12, 2208–2212Publication Date (Print):December 1, 1967Publication History Published online1 May 2002Published inissue 1 December 1967https://pubs.acs.or…
Speculation is offered on the nature of the molecular motion in crystals of polytetrafluoroethylene at temperatures well below the 19°C transition. It is proposed that a specific type of defect in the chain, a helix reversal point, creates a mechanism whereby large dynamic angular displacements of chain segments about…
Flow stress, electrical resistivity and dislocation density were measured in lightly cold-worked polycrystalline copper of 99·996% purity. Dislocation density was measured by thin film transmission electron microscopy. The dislocation resistivity was found to be independent of the dislocation density and to have value…
Abstract An experimental study of the flow of fine-textured, aqueous foams through Pyrex tubes is described. The foams range in quality F (ratio of gas volume to total volume) from 0.70 to 0.96 and behave like pseudoplastic fluids. At lower flow rates they exhibit laminar flow and have apparent viscosities which incre…
Adhesive and tractive forces of diatoms have been measured by the bending of a glass fibre. The results show that motility depends on attachment to the substrate. Movement on girdle bands occurs when the raphe acts against lumps of trail substance. Resistance to shear stress in laminar flow through a capillary tube is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Diffusion in Crystalline SolidsA. R. Allnatt and A. V. ChadwickCite this: Chem. Rev. 1967, 67, 6, 681–705Publication Date (Print):December 1, 1967Publication History Published online1 May 2002Published inissue 1 December 1967https://pubs.acs.org/doi/10.1021/cr60250a0…
Abstract A structural scheme is proposed for the synthetic Mg-Al hydroxycarbonates described in Part I (Gastuche, Brown & Mortland, 1967) based on chemical and X-ray powder data. The structure consists of positively-charged brucite-like layers in which Al replaces Mg up to a maximum of about one in three sites. The po…
The absorption spectrum of 0.01%—0.05% ytterbium-doped calcium tungstate is reported, observed at liquid-helium temperature. Some of the samples contained sodium for charge compensation. The effect of Na charge compensation for Yb was found to be similar to previous results observed for Na-compensated Ce in the same h…
As shown in a previous publication, the Helmholtz free energy per particle (divided by kBT) for a rigid disk system has the following asymptotic form in the limit of the reduced density θ=A0/A→1:F/NkBT∼2ln(λ/a)−2ln(θ−1−1)+C+D(θ−1−1)+···, in which C and D are appropriate numerical constants, λ is the mean thermal de Br…
A general theory concerning the properties of magnetic materials having a nonuniform saturation magnetization is developed. In this theory, the local saturation magnetization and the local exchange interaction are assumed to vary in an arbitrary manner throughout the sample. It is further assumed that a dc magnetic fi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRefinement of pendent drop method for the measurement of surface tension of viscous liquidRyong Joon Roe, Vincent L. Bacchetta, and P. M. G. WongCite this: J. Phys. Chem. 1967, 71, 13, 4190–4193Publication Date (Print):December 1, 1967Publication History Published online1 Ma…
Studies of the reaction between monosilicic acid and crystalline aluminium hydroxide showed that a number of layers of silicic acid could be formed on the surface of the hydroxide. Silicate is considered to be adsorbed as silicic acid rather than as silicate ions. The first layer was produced by rapid reaction of sili…
F. Brailsford London: Van Nostrand. 1966. Pp. x + 274. Price £1 10s. The author's main aim has been to present an account of ferromagnetism with some mention of antiferro- and ferri magnetism. A chapter on dia- and paramagnetism is included for introductory purposes.
Abstract The materials formed by dialysis of the precipitates formed by the reaction of NaOH with mixed Mg-Al solutions are described. In addition to aluminium and magnesium hydroxides, two hydrocarbonates having Mg/Al ratios of about 5 : 1 and 2 : 1 are formed, essentially pure, from solutions with Mg/Mg + Al molar r…
The crystal structure of barium ferrite, BaFe12019,has been determined and refined with the use of three-dimensional counter data. The symmetry is P63/mmc; the unit cell whose dimensions are a = 5.893 Aand c = 23.194 A, contains two formula units. The structure is built up of ten close-packed (both cubic and hexagonal…
This paper describes the development of an instrument which is analogous to an electron microprobe x-ray analyzer, whereby the electron microprobe is replaced by an ion microprobe, and the x-ray spectrometer by a mass spectrometer. A duoplasmatron is the primary ion source. The primary ion beam is mass separated to el…
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