Materials Literature
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The ground state spin arrangements in magnetic compounds of the NaCl type structure are studied by consideration of exchange interactions between nearest neighbors ( J 1 ) and between next-nearest neighbors ( J 2 ). Ferromagnetic arrangement as well as antiferromagnetic arrangements of the first kind, second kind, and…
A new form of sandwich core of high strength created by a topological transformation of a single plane is proposed herein. The resultant core is to be manufactured from a single sheet through a plastic forming. The purpose of this proposition is to present a sandwich core which has following principal characteristics;…
Wave-propagation effects induced in isotropic materials by either explosive or impact loading uniformly over a planar surface are much simpler than those produced in anisotropic solids in which significant transverse particle motion may occur. Such behavior in linearly elastic anisotropic solids has been investigated…
In twinned crystals the intensity contribution from the separate individuals can be estimated from the observed intensities without any knowledge of the actual structure, even when the two reciprocal lattices are completely superimposed. Once the separate intensity contributions are known the trial structure can be so…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand binding by metalloporphyrins. III. Thermodynamic functions for the addition of substituted pyridines to nickel(II) and zinc(II) porphyrinsS. J. Cole, G. C. Curthoys, E. A. Magnusson, and J. N. PhillipsCite this: Inorg. Chem. 1972, 11, 5, 1024–1028Publication Date (Pri…
A model Hamiltonian has been constructed for the ferroelectric transition in the perovskite structure in terms of localized-strain and soft-normal-mode coordinates and temperature-independent model parameters. No anharmonic interactions higher than fourth order are considered. The free energy for tetragonal, orthorhom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of asymmetric silicon. XX. Hydroxylation and carbene insertion reactions of R3SiHL. H. Sommer, L. Arie Ulland, and G. A. ParkerCite this: J. Am. Chem. Soc. 1972, 94, 10, 3469–3471Publication Date (Print):May 1, 1972Publication History Published online1 May 20…
Abstract Thermal conductivity measurements were made on polyethylene samples which had been crystallized at different temperatures in order to vary density and lamellar crystal thickness. Tests were also made on polyethylenes which were oriented by mechanical shearing and by crystallization in a temperature gradient.…
Strength degradation and crack propagation in Al 2 O 3 are shown to depend on the initial strength and grain size of the material. The strengths of single‐crystal sapphire and polycrystalline Al 2 O 3 specimens with grain sizes of 10, 34, and 40 μ m decreased discontinuously at the critical quenching temperature. In c…
The degree of roughness of a metallic adherend is frequently a design option for an adhesive joint. But which direction should be taken for optimum joint strength? Should the surface be polished or macroscopically roughened, or is roughening inconsequential? In practice, roughening is generally recommended, but upon w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic study of the synthesis and spectral properties of meso-tetraarylporphyrinsJean B. Kim, John J. Leonard, and Frederick R. LongoCite this: J. Am. Chem. Soc. 1972, 94, 11, 3986–3992Publication Date (Print):May 1, 1972Publication History Published online1 May 2002Pub…
It was shown experimentally that A ‐site vacancies predominate in La‐substituted lead titanate‐zirconate (PLZT) solid solutions. The formation of B ‐site vacancies is favored under increased PbO vapor pressure, but preparation of PLZT‐perovskite phases with B ‐site vacancies only is impossible since the increase in th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAuger lines in x-ray photoelectron spectrometryC. D. WagnerCite this: Anal. Chem. 1972, 44, 6, 967–973Publication Date (Print):May 1, 1972Publication History Published online1 May 2002Published inissue 1 May 1972https://pubs.acs.org/doi/10.1021/ac60314a015https://doi.org/10.…
A simple model is described to estimate the activity balance of Rn- and Tn-decay products in a turbulent mixed air volume in the steady-state equilibrium, taking into account the attachment to aerosol particles and the removal of activity by ventilation and wall deposition. On the basis of this model the principal rel…
Abstract A change in the degree of vulcanization in a carbon black‐filled rubber is shown not to affect the change of in‐phase shear modulus with strain amplitude, provided the amount of filler is kept constant. Similar results are found with the change of out‐of‐phase modulus and phase angle with strain amplitude. A…
A new design principle is described which allows construction of mirrors that are of reasonable reflectivity (R>25%) in the extreme ultraviolet (λ = 50 to 500 Å). The measured performance of a first mirror for the near uv using this design principle is given.
The bulk of the fluorescence of lysozyme is located in Trp 62 and Trp 108. By examination of the fluorescence of derivatives in which Trp 62 and/or Trp 108 are specifically oxidized, it has been possible to detect a pH-dependent interaction between tryptophan residues. This interaction is interpreted as energy transfe…
Huge magnetically induced strains (\ensuremath{\sim}0.2%) were observed in cubic Tb${\mathrm{Fe}}_{2}$ at room temperature. An anomalous "positive" temperature dependence for the magnetostriction is found for Dy${\mathrm{Fe}}_{2}$, yielding a peak in the magnetostriction exceeding 600 \ifmmode\times\else\texttimes\fi{…
Abstract Tensile bars of an isotactic propylene homopolymer and an ethylene–propylene copolymer were prepared by injection molding under a variety of melt temperatures and injection pressures. The effects of these processing variables on morphology and crystalline orientation were studied using optical microscopy and…
The permittivity of single-crystal single-domain strontium titanate has been measured in detail in the [001], [011], and [111] directions, as a function of temperature (from 4.2 to 300 °K), electric field (from −23 000 to +23 000 V/cm, and frequency (from 1 kHz to 50 MHz). The free energy of the crystal is determined…