Materials Literature
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Abstract The various nuclear magnetic resonance techniques used for determining self‐diffusion coefficients and activation energies in aluminium are evaluated critically. The data considered most reliable are analyzed together with the Al 26 ‐tracer measurements of self‐diffusion. From the temperature and the pressure…
The nuclear quadrupole coupling constants and isomer shifts of 57Fe in the spinels ZnFe2O4 and CdFe2O4 were measured using the Mössbauer effect. The signs of the quadrupole coupling constants were determined from spectra which were taken in an applied magnetic field. The sign is negative in both spinels. The isomer sh…
It is shown that the strain field of a straight dislocation in an anisotropic elastic continuum includes an infinite series of terms of order 2 and higher in inverse distance from the dislocation line. These terms are determined by the nature of the core. A method is developed of finding these terms for a given disloc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of tellurium tetrachlorideBruno Buss and Bernt KrebsCite this: Inorg. Chem. 1971, 10, 12, 2795–2800Publication Date (Print):December 1, 1971Publication History Published online1 May 2002Published inissue 1 December 1971https://pubs.acs.org/doi/10.1021/ic501…
Molecular-beam epitaxy has been used successfully for the attainment of single-crystal multiple-layer structures with alternating types of conductivities (p/n) or band-gap energies (GaAs/AlxGa1−xAs). Deposition by the molecular-beam method offers the possibility of growing periodic-structure layers with constant chemi…
Fracture energy and strength were determined for three series within a sodium borosilicate glass‐Al 2 O 3 dispersed composite system. The average particle sizes of the Al 2 O 3 dispersions were , and μm. Within each series, composites containing 0.10, 0.25, and 0.40 vol fractions of the Al 2 O 3 dispersed phase were v…
Examines the many fundamental chemical principles involved in the production of polyurethanes, including hydrogen bonding, polymers and their properties, kinetics, steric and inductive effects, catalysis, consecutive and simultaneous reactions, and equilibrium.
There has been confusion for many years over the origin of the $\frac{a}{H}$ term in the expression for the approach to saturation, $\frac{M}{{M}_{s}}=1\ensuremath{-}\frac{a}{H}\ensuremath{-}\frac{b}{{H}^{2}}+cH$, observed in many ferromagnetic materials. A calculation is presented which suggests that residual interna…
A simple method to correlate dislocations observed in X-ray topographs with etch pits is described and has been applied to the case of cyclotrimethylene trinitramine crystals grown from solution by slow cooling.
Measurements of dielectric properties, pyroelectricity, and the electron paramagnetic resonance spectrum of Gd3+ as a function of temperature have been used to examine the phase transitions in CsPbCl3. The results indicate the presence of five phase transitions and the loss of a center of symmetry at 194 K. The result…
Yavapaiite [KFe(SO+):l crystallizes in space group C2/m with two formula weights in a unit cell of dimensions a:8.152, b:5.153, c:7.877 A, B:O+.Of . The structure was solved by a three-dimensional Patterson synthesis and refined by the frill-matrix leastsquares method to R:3.27o. Goldichite [KFe(SOr)z.4HzO] in space g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition probabilities of europium in phosphate glassesR. Reisfeld, R. A. Velapoldi, L. Boehm, and M. Ish-ShalomCite this: J. Phys. Chem. 1971, 75, 26, 3980–3983Publication Date (Print):December 1, 1971Publication History Published online1 May 2002Published inissue 1 Decem…
A computer model was used to calculate the shape and average velocity v of a dislocation acted on by a viscous drag, and moving through a field of point obstacles. As a special case, the operation of a Frank-Read source was computed also. At sufficiently low velocities (and stress levels), the behavior is governed ent…
Immediate longitudinal detonations have been observed in confined small-diameter columns of PETN, RDX, and tetryl by using a focused Q-switched ruby laser. The energy ranged from 0.8 to 4.0 J in a pulse width of 25 nsec. A 1000-Å-thick aluminum film deposited on a glass window was used to generate a shock wave at the…
Abstract The effect of an aqueous environment on the tensile properties of Kapton polyimide film has been investigated. Immersion of specimens in distilled water at 25° to 100°C for time periods ranging from one hour to several hundred hours resulted in a decrease in the ultimate tensile strength of the polymer from 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of schizokinen, An iron-transport compound from Bacillus megateriumKary B. Mullis, J. R. Pollack, and J. B. NeilandsCite this: Biochemistry 1971, 10, 26, 4894–4898Publication Date (Print):December 1, 1971Publication History Published online1 May 2002Published iniss…
Abstract A scanning and high voltage electron microscope study of the fabric of laboratory sedimented moist uncompressed kaolinite and illite floccules reveals an abundance of face-face flake orientation in the porous clay network. Clays were flocculated in the laboratory in both distilled water and slightly saline (1…
The weak beam technique is used to obtain a value for the stacking-fault energy of copper. The observed partial dislocation image spacings are compared with many-beam computational models and it is demonstrated that anisotropic elasticity theory breaks down for small partial dislocation spacings in copper.
One of the modes of electromigration damage is shown to be related to irregularities in the grain-boundary structure of films. Based on the restriction of electromigration to grain boundaries, calculations are performed to determine the magnitude and distribution of excess vacancy concentrations at sites where electro…
A heritable connective tissue disorder of cattle, dermatosparaxis, is characterized by an extreme fragility of the skin and the presence of additional peptides at the N-terminal extremities of the collagen alpha chains, p-alpha(1) and p-alpha(2). The existence of an enzyme activity is demonstrated in normal connective…