Materials Literature
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An attempt was made to draw conclusions about elementary growth situations on the basis of typical doping inhomogeneities observed in dislocation-free float-zoned silicon crystals. Both nucleation and lamellar growth were equally recognized to be predominant factors in crystallization phenomena and discussed in terms…
The Mössbauer absorption in BaFe12−xAlxO19, SrFe12−xGaxO19, and Ba1−ySryFe12−xAlxO19 compounds has been investigated. Measurements carried out at T < Tc allowed to determine the behaviour of the hyperfine magnetic fields of the Fe3+ ions in the five sublattices of these structures for some values of x as a function of…
Results are reported on the electric and magnetic properties of (Bi1−xLax)FeO3 solid solution exhibiting simultaneously long-range order of electric and magnetic dipoles. In the concentration range 0 ≦ x < 0.30 close to the Néel temperature, an anomaly of ϵ(T) attributed to the influence of a decay of magnetic orderin…
The dielectric parameters are investigated as a function of composition, frequency, and temperature in copper containing ferrites. An “abnormal” behaviour of the dielectric constant is found and also the loss factor as a function of frequency and temperature in comparison with the “normal” behaviour of spinel ferrites…
A process for the conversion of far-infrared radiation to visible light in CdS is reported which is sensitive to a band of infrared. Two exciton levels are utilized, the lower of which is pumped by a visible light source. It is not required that the visible or the infrared be resonant between the two levels.
A new empirical set of "effective ionic" radii for tetravalent atoms in 6-coordination has been constructed. It is based on V 1/3 vs. r plots for isostructural series of M 4+ compounds of high symmetry. The radius values resulting from a non-linear least-squares refinement of all the data have been adjusted to coincid…
Relative subshell-photoionization cross sections have been measured directly for solid samples of sodium fluoride and sodium chloride by the technique of x-ray-photoelectron spectroscopy. Values are reported for the subshell-photoionization cross sections of the sodium $2s$ and $2p$; chlorine $2s$, $2p$, $3s$, and $3p…
Memory and threshold switching processes are described, as observed in systems consisting of thin (∼0.5 μ) polymer films (polymethylmethacrylate, polystyrene, polyethylmethacrylate, polybutylmethacrylate) between inert electrodes (graphite, molybdenum, NESA glass). The memory off-state is highly linear, in contrast to…
The high-resolution x-ray photoemission spectra (XPS) of the total valence bands of atomically clean diamond, graphite, and glassy carbon, obtained with monochromatized Al $K\ensuremath{\alpha}$ radiation, are reported and discussed. By comparing valence-band and carbon-$1s$ photoelectron kinetic energies, the XPS val…
A Monte Carlo simulation is applied to investigate the escape process of the secondary electrons in a metal. The calculated energy distribution of secondary electrons agrees satisfactorily with the experimental results. The lateral distribution of secondary electrons is also calculated and is similar 10 Å for normal i…
Thermal conductivity measurements have been taken between 2 and 300 K on composites made from an epoxy resin, Araldite MY 740, with powder fillers of glass spheres, quartz, corundum and diamond. Above about 10 K the conductivity of the composites is in good agreement with theory for the glass spheres, whilst for non-s…
Abstract The representation of the lattice vibrational component of the specific heat first proposed for MgAl2O4 is applied to cobalt and nickel ferrite. In each case, subtraction of the theoretically predicted lattice specific heat from the experimental data yields a residual contribution which closely follows a T3/2…
Antiferromagnetic nickel sulphide has a small temperature-independent magnetic susceptibility. The ordered moment per nickel atom, measured with neutrons, decreases from ${1.45\mathrm{\ensuremath{\mu}}}_{\mathrm{B}}$ to ${1.00\mathrm{\ensuremath{\mu}}}_{\mathrm{B}}$ at 4.2 K with a decrease of 0.6% in the Ni-Ni distan…
Plasticized poly(vinyl chloride) was compounded with 10-100 phr of 6 µ calcium carbonate, 4.5 µ calcined kaolin aluminum silicate clay, 0.18 µ thermal carbon black, 0.012 µ fumed silica, chrysotile asbestos of 10 14 fibrils/gram and 200/1 aspect ratio, and 1/2-inch long chopped glass roving. All six increased indentat…
Despite the temperature gradients present in the Pt catalyst pad used in NH 3 oxidation and the usual surface rearrangement of the platinum, measured mass transfer coefficients for stacked metal screens can be used to estimate the amount of catalyst required for satisfactory operation of a commercial NH 3 burner. Burn…
The corona-discharge method of measuring static charge susceptibility of carpets is used to evaluate the static propensity of fibers in various carpet samples. Triboelectric balancing, addition of internal or external antistatic agents, and inclusion of conductive fibers are suggested as approaches toward controlling…
Synopsis Aromatic nitriles may be trimerized at moderate temperature and pressure with p-toluenesulfonic acid as catalyst. Studies were conducted to establish the effect of the reaction temperature, pressure, time, and catalyst concentration on yield of the trimerized product. Trimerization studies were also conducted…
Rotational hysteresis loss has been measured on small discs of approximately 4% silicon-iron single crystal with
The blending of traditional transformer design practice with the phenomenal speed and logic adaptability of a modem computer has lead to a greater insight into transformer design procedures. This is due in part to the ability of the computer to execute many cumbersome and reiterative calculations in a logical and step…
An equation for predicting the lea strength of ring-spun cotton yarns is evolved by correlating a function of the lea strength, namely. Bogdan's intrinsic-strength parameter, P, with an integrated fibre-quality index, Q, the regression coefficients being allowed to account for the effect of the spinning conditions. Th…