Materials Literature
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A ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$ single crystal was grown by the flame fusion method. It has rhombohedral symmetry and showed an antiferromagnetic Curie temperature (${T}_{c}$) of 307\ifmmode^\circ\else\textdegree\fi{}K. Below ${T}_{c}$ the magnetic susceptibility $\ensuremath{\chi}$ perpendicular to the [111]…
The octahedral sites in the spinel structure form one of the anomalous lattices in which it is possible to achieve essentially perfect short-range order while maintaining a finite entropy. In such a lattice nearest-neighbor forces alone can never lead to long-range order, while calculations indicate that even the long…
Single crystals of highly pure aluminium (99.99%) were plastically deformed and examined by means of electron microscopy and electron diffraction. Surfaces of the deformed crystals produce innumerable slip lines of various slip amounts and deformation bands. The latter greatly affect the diffraction pattern; Laue spot…
A mathematical analysis of various causes of irregular pickspacing has been carried out with special reference to the effect of warp and fabric relaxation on the position of the cloth fell and pickspacing.The effect of the free length of warp and fabric and the effect of different types of let-off motion are discussed.
This investigation shows that there is a relationship between viscosity, number of nuclei, and crystal growth during the firing of titania‐opacified enamels. This agrees with a similar relationship which Tammann found in his experiments with organic glasses. The history of the development of the size, shape, and relat…
A survey of all known semiconductors suggests that it is useful to discuss the existence and properties of a specific ‘ semiconducting bond ’. A valence bond treatment of semiconductors, because it takes account of the properties of the specific atoms present, furnishes certain results which are not provided by the us…
Abstract Polyvinyl chloride was condensed with a series of aromatic compounds (benzene, toluene, m ‐xylene, pseudocumene, and mesitylene) in the presence of aluminum chloride. These condensation reactions were carried out in several reaction media, in heterogeneous or semihomogeneous systems. The catalyst concentratio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures of Some Germanides of Formula M5Ge3Hans Nowotny, Alan W. Searcy, and J. E. OrrCite this: J. Phys. Chem. 1956, 60, 5, 677–678Publication Date (Print):May 1, 1956Publication History Published online1 May 2002Published inissue 1 May 1956https://doi.org/10.1021/j15053…
Abstract Polyethylene may be characterized by use of the light scattering technique applied to the solid polymer. The treatment of Debye and Bueche allows one to assign numerical values to this characterization in the form of two parameters, 〈η 2 〉, the mean square dielectric constant deviation and a size parameter, α…
Magnetic anisotropy induced by magnetic annealing was measured for Ni 3 Fe single crystal by means of a high temperature-torque magnetometer. It was found that the magnitude of anisotropy depends upon the crystallographic direction of the field which is applied during annealing. It was largest for <111>, next for <110…
Numerical methods are used to study the behavior of the energy levels of a nucleus, having nonzero quadrupole moment and spin I = 1 or 32, under the influence of a constant uniform external magnetic field and an electric crystalline field of axial symmetry. These numerical results are of use when experimental conditio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heats of Reaction of Pyridine and Nitrobenzene with Boron Trifluoride, Trichloride and Tribromide; the Relative Acceptor Properties of the Boron Halides1,2Herbert C. Brown and Robert R. HolmesCite this: J. Am. Chem. Soc. 1956, 78, 10, 2173–2176Publication Date (Print):Ma…
Rates of dehydration under vacuum, and at a series of controlled water vapor pressures, have been carried out for powdered samples of magnesium sulphate heptahydrate and of cobaltous chloride hexahydrate. It has been found for the magnesium salt that as the pressures are increased, the rate at first drops rapidly, thi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallographic Data. 121. Beryllium Sulfide, BeSEugene. StaritzkyCite this: Anal. Chem. 1956, 28, 5, 915Publication Date (Print):May 1, 1956Publication History Published online1 May 2002Published inissue 1 May 1956https://pubs.acs.org/doi/10.1021/ac60113a045https://doi.org…
FeTiO 3 and NiTiO 3 ceramics were synthesized, their thermal, electrical and magnetic properties were investigated and the results obtained were discussed in connection with the crystal structure. Although NiTiO 3 is stable up to high temperatures even in air, FeTiO 3 is partially oxidized even when it is cooled, bein…
Schrifttumsauswertung über das Zustandsschaubild Fe O-Al2O3. Thermoanalytische, mikroskopische und röntgenographische Untersuchungen zur Ermittlung der Liquidus- und Soliduslinien des Systems unter Berücksichtigung des Spinells FeO · Al2O3. Festlegung von zwei eutektischen Punkten bei etwa 5 % Al2O3 und 1330° sowie be…
A theoretical analysis of the factors governing pickspacing has been carried out as part of an investigation into the problem of setting-on places in woven fabrics. Mathematical expressions relating the rate of take-up to the position of the cloth fell and the latter to pickspacing are developed for both bumping and n…
The mechanism of decomposition of manganous and ferrous carbonates has been explored by high‐temperature X‐ray diffraction in controlled atmospheres, by differential thermal analysis, and by thermogra vimetric analysis. The heat effects of the series of reactions which occur are calculated from thermochemical data. Th…
The effect on cobalt ferrite of heat treatment in a magnetic field has been studied by neutron diffraction. The data indicate that the magnetic moments are, in general, displaced from the directions which would be expected from consideration of crystalline anisotropy alone. The effect is greater in ferrites that are i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Oxidation of Graphitized Carbon Black.W. R. Smith and M. H. PolleyCite this: J. Phys. Chem. 1956, 60, 5, 689–691Publication Date (Print):May 1, 1956Publication History Published online1 May 2002Published inissue 1 May 1956https://pubs.acs.org/doi/10.1021/j150539a046https…