Materials Literature
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The efficiency of Mn(IV) luminescence in fluorine coordination is discussed in the context of the chemical bonding in the center. It is possible that the lower degree of σ‐antibonding in the orbitals, and the greater degree of π‐antibonding in the orbitals, compared with the effect observed in oxides, contributes to a…
Previous work on transverse impact of single textile fibers is reviewed and extended to model orthogonal weaves in which fiber crossovers are simplified as pin. joints. A dynamic finite-element computer technique previously developed for single fibers is extended to model the woven panel, and this method is shown to p…
Chatelain hypothesized that orientation of liquid crystals by interaction with the substrate is due to an adsorbed layer of fatty contaminants, but substrate topography has also been postulated as a causal factor. Experiments with chemically cleaned surfaces rubbed without contamination now confirm the importance of t…
A simple expression for the magnetoresistance of the antiferromagnetic metals due to the electron-spin scattering by the s - d interaction is obtained using the molecular field approximation for the spin system. The expression includes the ferromagnetic case. It is shown that in the antiferromagnetic case the positive…
The P2Co4(H2O)2W18O6810– anion contains four edge-linked coIIO6 octahedra with coplanar cobalt atoms, in addition to two fragments of the Keggin structure.
Die seit der Vollendung des tschechischen Manuskripts dieses Buches verlaufene Zeit lieB einige Erganzungen des Textes zwecks Erfassung des neuesten Standes unserer Kenntnisse auf dem Gebiete der magnetischen Oxide als unerlaBlich erschei-
Peculiarities of the dielectric properties of the compound PbMg 1/3 Nb2/3 O3(PMN) such as the relaxation character of the dielectric polarization, deviation of permeability from the Curie-Weiss law above the Curie temperature etc. have been discussed on the basis of the idea of a diffused phase transition. 1-6 A model…
Theories of the biaxial tensile properties, the uniaxial tensile properties, and the shear-deformation properties of plain-weave fabrics are presented in a general form, a simplified stereo-model of the structure of plain-weave fabrics being used throughout these theories. In the first part of this series, the biaxial…
1. The Nature of Materials Science. 2. The Structure of Perfect Solids. 3. The Structure of Real Solids. 4. Equilibrium. 5. Kinetics. 6. Introduction to the Mechanical Properties of Solids. 7. Plastic Deformation in Crystalline Solids. 8. Strengthening Mechanisms. 9. The Relation Between Mechanical Properties and Micr…
We discuss the nature of the order in the main smectic phases (A, C, and B) together with the related phase transitions. (1) The B phase may correspond to a plastic crystal, or to a system of weakly coupled solid layers: to discriminate between these two models, acoustical studies using shear waves appear to be most p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal reactions of alkyl N-carbomethoxysulfamate estersEdward M. Burgess, Harold R. Penton Jr., and E. A. TaylorCite this: J. Org. Chem. 1973, 38, 1, 26–31Publication Date (Print):January 1, 1973Publication History Published online1 May 2002Published inissue 1 January 1973…
The optical properties of silicon nitride layers formed by the pyrolysis of a mixture of and are presented. These results are used together with published data for materials to formulate a bonding model for and which quantitatively describes their optical characteristics. The basic units of this structure are Si tetra…
Equations for polar and nonpolar interactions across the interface are developed by using energy additivity concept in a semi-continuum model. Interfacial and surface tensions of molten polymers are measured directly and used to test the resulting equations: The first expression may be called the harmonic-mean equatio…
Abstract When tested in tension, a cross‐linked epoxy resin can be made to exhibit shear yielding. A modified von Mises criterion, τ = τ 0 − μ P describes the yielding behavior of the same resin under a biaxial stress system, indicating that the flow of the material is pressure sensitive. Butadien‐acrylonitrile elasto…
The relationship between crystallisation and melting behaviour of copolymers and their morphology has been the subject of intensive discussion. One of the main points of interest is the distribution of the noncrystallizable units within the partially crystalline systems. For the explanation of physical properties of c…
The basic phenomena involved in double-pumped phosphors with energy transfer are described and discussed. The role played by successive multiple transfers as well as cooperative processes giving rise to antistokes fluorescence is emphasized for the different kinds of doping which have been used. The field of the diffe…
Abstract The differential scanning calorimeter (Perkin‐Elmer DSC‐1) is used to characterize the cure of a general‐purpose polyester during isothermal and scanning experiments. The technique is based on a new proposed model for the kinetics of isothermal cure. The model yields results which are in good agreement with e…
Abstract Conventional optical microscopy and, more particularly, a range of electron microscopic techniques have been adapted to identify the nature, and examine the chemical consequences, of emergent structural imperfections in single crystals of a number of anisotropic solids. Detailed studies have been carried out…
The operative slip systems, and the strain hardening behaviour in tension of single crystals of β′-AgMg (CsCl structure) has been investigated in the temperature range from 25 to 298 °K; a few compressive experiments are also reported. It is shown that β′-AgMg crystals deform by slip on the {112} 〈111〉, {110} 〈111〉, {…
The magnetic structures of antiferromagnetic manganese pyrophosphate and copper pyrophosphate have been determined by single crystal neutron diffraction techniques. There have been two previous determinations of the structure of manganese pyrophosphate. The discrepancy between these results is explained by postulating…