507. Some cyclic tetra-amines and their metal-ion complexes. Part I. Two isomeric hexamethyltetra-azacyclotetradecanes and their copper(II) and nickel(II) complexes
N. F. Curtis, J. Chem. Soc., 1964, 2644 DOI: 10.1039/JR9640002644
Materials Literature
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The 80 Diperiodic Groups in Three Dimensions
The law-energy electron diffraction work of L. H. Germer, J. J. Lander, A. U. MacRae, J. Morrison and others is resulting in new information about surface structures. These three-dimensional structures have periodicity only in two dimensions. The 230 triperiodic space groups are not applicable to the solution of these…
Molecular Theory for the Tensile Strength of Gum Elastomers
The tensile strength and ultimate elongation properties of any given amorphous elastomer can be described by a characteristic failure curve. It is shown in this paper that the failure curve can be predicted from a knowledge of the creep curve of the elastomer together with the data from a Mooney-Rivlin plot. The theor…
Effects of surface stress relaxation on the electron microscope images of dislocations normal to thin metal foils
The two-beam dynamical theory of Howie and Whelan is used to calculate the electron microscope image contrast from dislocations normal to a thin crystal and parallel to the direction of the incident electron beam. Bending of the lattice planes due to surface relaxation and change in lattice parameter are taken into ac…
Effect of pH, Sulfates, and Chlorides on Behavior of Sodium Chromate and Nitrite as Passivators for Steel
Corrosion rates of iron in chromate and nitrite solutions were measured by a sensitive electric resistance method supplemented by weight loss. The critical concentration below which corrosion increases or pitting occurs is for and for . Presence of Cl − and increases these values. Sulfates break down passivity in nitr…
Fault Structures in Wurtzite
Abstract A more precise interpretation of the defect structure of wurtzite crystals as observed in the electron microscope is presented. It was found previously that the crystals contain faults in the basal planes (b‐faults) and in prism planes (p‐faults). Direct evidence is presented indicating that the transition wu…
Luminescent Behavior of the Rare Earths in Yttrium Oxide and Related Hosts
The absorption, excitation, and fluorescence spectra of are presented and interpreted. The high luminescent efficiency of this material and its unusual performance at elevated temperatures are discussed. The comparative behavior of other rare earths in yttrium oxide and of the rare earths in certain other oxides of yt…
Dynamic Surface Phenomena in the Spontaneous Spreading of Oils on Solids
A study by interference microscopy and ellipsometry shows that the spontaneous spreading of nonpolar liquids on smooth, clean metal surfaces is characterized by the advance from the bulk liquid of a primary film less than 1000 A. thick, usually followed by a thicker secondary film. The movement of the secondary film r…
Magnetization Process of a Screw Spin System. II
Magnetization processes and structure changes in helical and modified helical spin arrangements due to application of a magnetic field are studied for finite temperatures and absolute zero in a number of cases of different anisotropy energy. In the case of a strong anisotropy giving rise to a propser helical structure…
Morphology of Isothermally Bulk-Crystallized Linear Polyethylene
The internal morphology of isothermally bulk-crystallized fractions, and of whole polymer, Marlex 50 polyethylene is revealed by fracture experiments. Three distinctly different types of lamellae are then observable if one uses suitable electron microscopic techniques: (1) regular or type I lamellae which are similar…
Stereochemistry of Ethylenediaminetetraacetato Complexes. II. The Structure of Crystalline Rb[Fe(OH2)Y].H2O. III. The Structure of Crystalline Li[Fe(OH2)Y.2H2O
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of Ethylenediaminetetraacetato Complexes. II. The Structure of Crystalline Rb[Fe(OH2)Y].H2O. III. The Structure of Crystalline Li[Fe(OH2)Y.2H2OM. D. Lind, M. J. Hamor, T. A. Hamor, and J. L. HoardCite this: Inorg. Chem. 1964, 3, 1, 34–43Publication Date (Prin…
Theory and Measurements of the Glass-Transformation Interval of Polystyrene
Equations for the apparent heat capacity in the glass-transition interval as functions of temperature, heating rate, and thermal history have been developed and programmed for computation. The hole theory of liquids was used as basis for the analysis of the glass transition. Experimental information was derived from d…
Radio noise due to insulator corona
Radio noise due to corona discharges on suspension insulators is studied as influenced by atmospheric humidity, insulator-surface pollution and harmonic contents in the alternating-voltage wave applied across the insulator. The radio-noise level is also measured under direct-voltage conditions. The tests are carried o…
Nautiloid shell morphology
The fundamental parts of the nautiloid shell are (1) conch, (2) septa, (3) connecting ring, (4) siphonal deposits, and (5) cameral deposits. It is important to recognize that the septal neck and connecting ring, ordinarily considered the two hard parts of the siphuncle universally developed, are discrete structures. C…
The Physical Properties of Soil
A sample of soil taken from the field will contain mineral particles of very different sizes. There may be sizeable stones in it which have to be removed in order to obtain a homogeneous sample on which to conduct soil investigations. This is unfortunate because the field behaviour of a soil may be markedly affected b…
Influence of dislocation dipoles on physical properties
J. J. Gilman, Discuss. Faraday Soc., 1964, 38, 123 DOI: 10.1039/DF9643800123
A novel method of semiconductor device measurements
Electrical signals induced in semiconductor devices by a high-resolution scanning electron beam have been used to determine the boundaries of doped (p or n) regions, even when these boundaries lie beneath passivating oxide layers, or beneath evaporated metal leads. The uniformity of planar junctions lying beneath the…
Preparation and Properties of the Boron Phosphides
The reactions between boron and phosphorus to form the boron phosphides are described. The elements were compacted into pellets and dropped into a preheated reaction zone. The reaction between zinc phosphide and boron also resulted in the formation of the boron phosphides and the complete removal of zinc in the vapor…
2—FILAMENT MIGRATION IN SINGLE YARNS
The examination of yarns containing one coloured filament enables the behaviour of individual filaments within twisted continuous-filament yarns to be studied. By this means it is possible to correlate the radial position at any one point in a yarn with that at all subsequent points. This has been done for a series of…
Crystallization and Melting Behavior of Polyethylene Oxide Copolymers
The course of isothermal crystallization of a series of high molecular weight polyethylene oxide copolymers was studied with a microdensity balance. The comonomers, butylene and styrene oxides, ranged from 0.2 to 4 mole%; several examples of different polymerization conditions were also studied. The consequence of add…