Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structures of cis-bis(pentahaptocyclopentadienyl)tricarbonyl(triphenyl phosphito)diironF. A. Cotton, B. A. Frenz, and A. J. WhiteCite this: Inorg. Chem. 1974, 13, 6, 1407–1411Publication Date (Print):June 1, 1974Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton magnetic resonance studies of ligand-exchange equilibriums for dihalo- and diethoxybis(.beta.-diketonato)titanium(IV) complexesRobert C. Fay and R. Neil. LowryCite this: Inorg. Chem. 1974, 13, 6, 1309–1313Publication Date (Print):June 1, 1974Publication History Publis…
resistance in the higher dose range. Tertiary butanol can almost completely reverse the sensitization determined by Ag+. These results are consistent with the *OH radical theory of sensitization previously offered from this laboratory. In 02-saturated suspensions, Ag2S04 produces an over effect that is dependent on co…
Direct observations of grain-boundary ledges have been made in a number of metals and alloys by transmission electron microscopy. Grain-boundary ledges have been observed to be sources of dislocations, and emitted dislocations take on the appearance of pileups. It is suggested that, because of the dearth of observatio…
The spin density distribution in the ferromagnetic alloy FeB has been determined from neutron diffraction measurements. Features are: an aspherical distribution of magnetization density around the iron atoms. Particular features found in the study are a moment of 0.95 mu B associated with the iron atoms, an interactio…
Heat-capacity and entropy changes at the metal-insulator transitions have been measured on ${\mathrm{Ti}}_{4}$${\mathrm{O}}_{7}$ single crystals. The 130-K transition is related to a disordering of the ${\mathrm{Ti}}^{3+}$ and ${\mathrm{Ti}}^{4+}$ chains at the unit cell level. ${\mathrm{Ti}}^{3+}$ pairing occurs in t…
The strain rate dependence on dynamic crack propagation in viscoelastic solids was experimentally verified for PMMA by the velocity gauge method and fracture surface observation. It was found that the dependence was mainly due to the viscous term effect, and this was supported by the observation of deviation of the st…