Materials Literature
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The equilibrium positions of all the partial dislocations in a pile-up of dissociated dislocations are calculated numerically. As expected, the equilibrium width of the stacking fault varies along the length of the pile-up-being smaller near the tip than farther away from the tip. However, the stress concentration at…
A solid‐state reversible cell of the type , TBAI, C, has been developed. The anodic and cathodic contact polarizations have been minimized by amalgamation of the silver electrode and the use of a suitable mixture made of tetrabutylammonium iodide (TBAI), iodine, and graphite, respectively. The cell has an open‐circuit…
Abstract A number of polymers have been exposed to SO 2 and NO 2 gas under various conditions. Chain scission, crosslinking reactions, and changes in infrared spectra have been noted. All polymers suffer some deterioration, which may be considerable with exposure over long periods of time. Elastomers form a separate g…
Abstract The plant removal of native K from seven surface soils and seven subsoils from Iowa was studied at their “minimal” levels of exchangeable K. The “minimal” levels of exchangeable K were directly related to the percentages of <2 μ clay present in the surface soil samples. Plant uptake of nonexchangeable K wa…
B. F. Hoskins, F. D. Whillans, D. H. Dale and D. C. Hodgkin, J. Chem. Soc. D, 1969, 69 DOI: 10.1039/C29690000069
Phase diagrams of the CuO‐MoO 3 system were determined in oxygen, in air, and under oxygen pressure. The first two diagrams are quite similar, with temperatures up to 40° higher occurring in oxygen than in air. Stable compounds obtained by low‐temperature sintering were CuMoO 4 and CUZMoO 5 , which melted incongruentl…
Abstract A micromagnetic calculation is given of the critical thickness of the nucleation of stripe domains in thin ferromagnetic films with so‐called perpendicular anisotropy. The micromagnetic equations were solved in linear approximation by means of a complete system of functions. The paper presents the critical th…
Compounds of the type [Fe3(RCO2)6(OH)2]X,xH2O have been studied by magnetic and Mössbauer methods. All the compounds are high-spin and trinuclear in the solid state with the iron atoms in almost equivalent sites.
The Rogowski and Bruce electrode profiles were designed for use in free-field conditions. A new electrode profile is presented which has been designed to give a uniform field over as large a gap as possible while being used inside a discharge chamber. The departures from uniformity of the electric field have been calc…
The slip geometry in the body-centred cubic compound β′AuZn (CsCl type structure) was determined from two-surface optical microscopy studies of slip traces on single crystals. The slip surface is generally a non-crystallographic or high index {hk >0} plane in the zone of the slip direction ⟨001⟩ and is temperature, st…
Shrinkage isotherms of powder compacts of two soda‐lime glasses were measured in various partial pressures of water vapor. The rate of shrinkage increased with increasing partial pressure of water vapor. Shrinkage isotherms of porous glass of high silica content were also sensitive to the partial pressure of water vap…
Abstract The outline of a high‐pressure advice for gaseous hydrogen as a double piston‐cylinder system is given. Any contact between the gaseous volume and the pressure‐transmitting liquid is avoided. The electrical resistance of Pd and Pd–Au (50 wt%) foils was measured at (25 ± 0.1) °C up to 24000 at of gaseous hydro…
Large reversible photochromic changes were observed in SrTiO3double doped with Mo and either Fe or Ni. The photochromic absorption is induced by irradiation in the vicinity of 4000 Å and decays thermally in minutes or can be bleached to its original state by long wavelength radiation. A model is presented in which a c…
Abstract To obtain more useful information about the effect of the degree of stereoregularity on the motion of the polymer chain, the dielectric and dilatometric measurements were made for a series of stereoregular poly(methyl methacrylates) (PMMA). The α‐ and β‐absorptions were observed in each sample, of which the d…
Precise potential control and measurement have permitted the determination of the primary activation potential, E a , of an Fe‐24% Cr alloy in to within ± 0.5 mv and the determination of the kinetics of passivating film growth at this potential, as well as at other potentials. Small changes in potential give rise to l…
The effect of a series of ternary alloying additions on the galvanic behavior of Al‐Sn base alloys has been investigated. A group of soluble ternary elements including Bi, Zr, Mg, and Ag expands the aluminum lattice, stabilizes the Al‐Sn solid solution and either maintains or enhances the high galvanic currents observ…
Abstract A photoelectric method for the registration of the triboluminescence spectra is described. Using this method the triboluminescence spectra of LiF crystals at destruction in air, vacuum, and in an argon atmosphere are obtained. The experimental study of triboluminescence of some alkali halide crystals have bee…
The nature of freshly prepared and hydrothermally treated anodic alumina films has been studied by infra-red spectroscopy supported by electron microscopy. A comparison of the spectra obtained from freshly prepared specimens and those obtained after evacuation and deuterium exchange respectively, suggests that unseale…
Several parameters controlling the soiling of polyester/cotton fabrics have been assessed. Among those which were found to contribute were hydrophobicity of substrate, fabric construction, fabric finishes, type and concentration of detergents. Laboratory results showed that the body sebum is largely responsible for pi…
Objective estimation of the error (σFmeas) in each structure factor (Fmeas), by a procedure such as that outlined in Acta Cryst. (1964). 17, 1327, allows the indicator \cal uα = [Σ (Δ2Fmeas/σ2Fmeas) ÷ χ2m − n,α]1/2 to be evaluated, where ΔFmeas = |Fmeas| − |Fcalc|, χ2m − n,α is given by the χ2 distribution at the α-si…