Materials Literature
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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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Abstract Isotaktisches Polypropylen bildet bei der Kristallisation vier verschiedene Typen von Sphärolithen, die nach P ADDEN und K EITH als Typ I bis IV bezeichnet werden. Die Typen I und II zeigen eine monokline Kristallstruktur, während die Typen III und IV pseudohexagonal kristallisieren. Die Sphärolithe vom Typ I…
The decomposition of the methoxymethyl radical, generated in the mercury-photosensitized decomposition of dimethyl ether, has been investigated over the temperature range 200 to 300 °C and the pressure range 3 to 600 mm Hg. The radical decomposes to give a formaldehyde molecule and a methyl radical. The effects of pre…
The relationships between the third-order elastic constants of monocrystalline and polycrystalline (quasi-isotropic, randomly oriented) solids of cubic symmetry are derived according to elastic strain energy balances assuming negligibly small elastic strain energy contribution from mismatching of the grain boundaries.…
The complex dielectric constant of reduced rutile, $\mathrm{Ti}{\mathrm{O}}_{2\ensuremath{-}x}$, has been measured at frequencies between ${10}^{2}$ and ${10}^{5}$ Hz at temperatures between 1.2 and 50\ifmmode^\circ\else\textdegree\fi{}K. Three distinct relaxation processes have been observed: process I at temperature…
The isotope effect has been measured for self-diffusion in single crystals of zinc parallel and perpendicular to the $c$ axis at seven temperatures in the range 289-418\ifmmode^\circ\else\textdegree\fi{}C. A vacancy mechanism is found, with $\ensuremath{\Delta}K=0.93$, independent of temperature within the experimenta…