Materials Literature
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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…
The low-temperature size effects in the phonon-drag thermopower and electrical and thermal conductivities of bismuth, measured under identical experimental conditions on a tuningfork sample of arm thicknesses 2.8 and 1.2 mm, are reported. The thin arm has the highest positive thermopower and a plateau is observed for…
Crystals of calcium fluorophosphate ${\mathrm{Ca}}_{10}$${(\mathrm{P}{\mathrm{O}}_{4})}_{6}$${\mathrm{F}}_{2}$ have been grown from melts of various compositions. Optical and ESR measurements have been performed on samples before and after various treatments such as a uv irradiation and a thermal quench. Two kinds of…
Longitudinal and transverse relaxation times of 119Sn have been measured as a function of temperature in liquid SnCl4 and SnI4. For SnCl4, T1 is a monotonically decreasing function of temperature and is dominated mechanistically by spin-rotation over the entire liquid range. In SnI4, T1 passes through a maximum near 1…
A new form of Cu 3 V 2 O 8 was prepared at 30 kbar and 900 °C. The unit cell has dimensions a = 6.2493(9), b = 7.9936(9), c = 6.3776(10) Å, β = 111.49(1)°, and the space group is P2/c. The crystal structure, refined by least-squares to a final R = 0.054, using 848 reflections, is similar to that of Mg 3 V 2 O 8 . Chai…
free path 1(k) will be parallel to k, and hence one may write 1 =7~V, OH 'e(rd ~/m )/(~d&')