Materials Literature
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The reaction of [PW12O40]3–, [BW12O40]5–, and [H2W12O40]6–(1.5 × 10–5 mol dm–3) with excess of hydroxrde ion at an ionic strength of 1.0 mol dm–3 MCI (M = K, Na, or Li). to form [WO4]2–, phosphate, and borate, has been studied. The rate, and in some instances the mechanism, of the reactions is dependent on the cation…
In order to investigate some properties of a medium with a low number of particles in a Debye sphere, the electrical conductivity of high-pressure ionized Argon has been measured. A special emphasis is laid on the so-called "non-ideality" effects in the collective behaviour of charged particles. A kind of threshold fo…
It is shown that in alkali halides the increase of the static dielectric constant ε with temperature is exclusively due to anharmonic effects. A simple formula is given which permits the calculation of ε at any temperature if we know : (i) the dielectric constant at room temperature and (ii) the thermal variation of b…
Article Diffusion Coefficient of Carbon in Fe-Ni Austenite in the Temperature Range 950 — 1100° C was published on January 1, 1978 in the journal International Journal of Materials Research (volume 69, issue 1).
The electric dipole moments of derivatives of fourteen classes of mesoionic compounds have been measured. Vector analysis gives heterocyclic ring moments whose magnitude and direction provide support for the mesoionic formulations.
The connection between the phase transition conditions and the domain structure of BaTiO3 and PbTiO3 crystals is determined.
Wall-energy density as a function of wall orientation has been calculated on the basis of Zhirnov-type domain-wall theory. The equilibrium wall-orientations and the domain shapes which are consistent with the experimental observations have been successfully brought about for TGS and TGSe crystals. Two preferential ori…
The stroboscopic SEM has been developed to observe the two-dimensional dynamic voltage contrast images of semiconductor devices in the nanosecond and picosecond regions. It consists of a usual SEM and a pulse gate which is inserted between the electron gun and the condenser lens. The shortest beam pulse width is 0.2 p…
The relationships between fracture morphology of hydrogen-assisted cracking, microstructure, and crystallographic orientation were investigated using the scanning electron microscope. In the fracture morphology of hydrogen-assisted cracking, quasicleavage fracture, intergranular fracture, and dimple rupture were obser…
M F C Ladd and R A Palmer New York: Plenum 1977 pp xvi + 393 price $35.40 For several years the University of Surrey and Birkbeck College, London, have been running teaching courses in crystallography. Therefore a book written by Ladd (Surrey) and Palmer (Birkbeck), who have both been intimately involved in these cour…
Infrared spectra have been reported of silica immersed in solutions of anisole, six substituted anisoles (4-nitro, 4-chloro, 4-bromo, 4-methyl, 2-fluoro and 2,6-dimethyl), nitrobenzene and 4-nitrotoluene in heptane. Surface silanol groups were perturbed by hydrogen bonding interactions with either methoxy-groups or th…
Phase transformations in quenched, deformed, and aged copper-titanium alloys containing up to 5,6 at.-% Ti were studied by means of hardness measurements and electron microscope examinations of thin foils. The modulation wavelength showed a linear relationship with the logarithm of the aging time. Deformation caused a…
Recent developments in the physical understanding and the achievement of high chain extension in polymeric material which could lead to significant advances in existing and new areas of polymer processing technology are described. Solid-state deformation and melt and solution orientation are outlined
Abstract Head‐to‐head poly(vinyl cyclohexane) (H‐H PVCH) was prepared from 2,3‐diphenylbutadiene, which was polymerized by radical, 1,4 polymerization to poly(2,3‐diphenylbutadiene) and then catalytically hydrogenated to H‐H PVCH, H‐H PVCH was also prepared by catalytic hydrogenation of H‐H polystyrene (PS). The catal…
Mechanical properties of polycrystalline copper and Cu-13 at%Al alloy have been investigated as a function of grain size and specimen thickness at room temperature, with the following results: (1) The flow stress of both copper and Cu-13 at%Al alloy decreases as the ratio of specimen thickness to grain size decreases…
Photoconductivity (PQ and thermally stimulated conductivity (TSC) were investigated on some single-crystal perovskite oxides. Using PC spectral dependence, band gap and impurity-level depths were found. The TSC method gave further information about the energy spectrum of local levels. Due to a significant PC and deep…
The elastic constants, magnetic susceptibility, refractive index and density are reported for p,p'-diheptylazobenzene. The behaviour of the elastic constants of this non polar compound is very similar to that of related polar compounds. The anisotropy of both the static and the high-frequency permittivity is proportio…
The reaction of [SiW12O40]4–(1.5 × 10–5 mol dm–3) with excess of hydroxide ion at an ionic strength of 1.0 mol dm–3 MCl, to form [SiO4]4– and [WO4]2–, has been studied. The reaction proceeds in three distinct stages, the intermediates being [SiW11O39]8– and [SiW9O34]10–. The first stage proceeds via a base-dependent p…
In nematics, the simple shear flow may become unstable when the director is perpendicular to the shear plane. Here we study the non-linear regime above the threshold of the Homogeneous Instability [1]. We use a perturbative approach derived from exact equations within the framework of the Frank-Ericksen-Leslie continu…
A hot-stamping brass immune to dezincijication has been developed. The recommended composition is 35·0–37·0% zinc, 1·7–2·7% lead, 0·08–0·12% arsenic, remainder copper. The alloy contains sufficient beta phase at the hot working temperature (∼820°c) to ensure adequate formability. After stamping, a heat treatment, usua…