Materials Literature
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Apart from the high tenacity and modulus of elasticity, aramid based on paraphenylene terephthalamide also has very favorable temperature properties. These include high temperature resistance, nonflammability, and absence of heat shrinkage. Another advantage lies in its high chemical resistance. Compared with asbestos…
Dislocation motion in single crystals of the II-VI compounds (MS, (dSe, Zn() (wurtzite structure) and CdTe (zineblende structure) has been observed in silu by transmission electron microscopy at room temperature. Several common features are found. (1) The microscopic motion of dislocations is generally steady and cont…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordinative interactions in chelated complexes of silicon. 13. Experimental determination of the electron deformation density of a pentacoordinated silicon complexG. Klebe, J. W. Bats, and H. FuessCite this: J. Am. Chem. Soc. 1984, 106, 18, 5202–5208Publication Date (Print)…
Measurements are reported on the magnetostatic and dielectric resonances of samples of barium hexaferrite single crystals in the millimeter wavelength range. The behavior of these resonances versus frequency and temperature leads to the conclusion that the contribution of the intrinsic loss to the FMR linewidth is abo…
In 6.5wt% silicon-iron ribbons prepared by a rapid quenching roll method, grains of 10μm in diameter were observed to grow from surfaces to the inner part of ribbons. When the annealing temperature was about 700°C, the primary recrystallization was observed near the middle of the ribbon thickness, and at the annealing…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,3-Adamantane-3,13-porphyrin-6,6-cyclophane: crystal structure of the free base and steric effects on ligation of the iron(II) complexT. G. Traylor, N. Koga, L. A. Deardurff, Paul N. Swepston, and James A. IbersCite this: J. Am. Chem. Soc. 1984, 106, 18, 5132–5143Publicatio…
Acoustic-phonon dispersion relations of black phosphorus in its orthorhombic $A11$ phase have been measured along three principal directions mainly at 1 bar and 15.4 kbar. An anomalous softening has been observed on the LA[100] branch whose vibrational patterns (eigenvectors) have been analyzed based on a force-consta…
This paper discuses the stress corrosion cracking observed when slow strain rate tests were run on AISI 304 stainless steel specimens in oxygenated 288 C water. Transgranular, intergranular, and granulated stress corrosion cracks were observed. The type of cracking observed was a function of the degree to which the sp…
A c-axis alexandrite laser rod was longitudinally pumped in the 450–560 nm region with argon ion and dye lasers. In addition to the sharp R lines and broadband phonon-assisted transitions typical of mirror site Cr3+ ions in alexandrite, room temperature fluorescence spectra displayed characteristics in the 690–730 nm…
A micromechanical model for strength behavior as a function of grain size in two‐phase materials with thermal expansion mismatch and in single‐phase materials with thermal expansion anisotropy is presented. The strength vs grain‐size plot is interpreted in terms of internal stresses and the ratio of grain to flaw size…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of trans-M(O)2(CO)4 (M = Mo and W): intermediates in the photooxidation of matrix-isolated M(CO)6Joseph A. Crayston, Matthew J. Almond, Anthony J. Downs, Martyn Poliakoff, and James J. TurnerCite this: Inorg. Chem. 1984, 23, 20, 3051–3056Publication Date (Print):Se…
Measurements of the thermoelectric power along the three crystallographic axes of N-methyl-N-ethylmorpholinium bistetracyanoquinodimethane, ${\mathrm{MEM}(\mathrm{TCNQ})}_{2}$, in the temperature range 280-360 K are reported. The first-order metal-insulator phase transition at 338 K is observed as a discontinuous chan…
Abstract Die neuen Verbindungen K 6 Ge 2 S 6 und K 6 Ge 2 Se 6 kristallisieren monoklin in der Raumgruppe C2/m (Nr. 12) mit den Gitterkonstanten Die Verbindungen sind einander isotyp und bilden die K 6 Si 2 Te 6 ‐Struktur aus. Na 6 Ge 2 Te 6 kristallisiert monoklin in der Raumgruppe P2 1 /c (Nr. 14) mit den Gitterkons…
Abstract The results obtained from this study of kaolinite dehydroxylation explain why different investigators have ascribed both first-order kinetics and a diffusion mechanism to this reaction. The fact that activation energies reported by these workers agree well, in spite of the different kinetics assumed when perf…
In multiphase Sm(Co,Fe,Cu,Zr)7.6alloys the relations between the microstructure and magnetization processes have been analysed after different annealing treatments by investigations of the domain structure and of the characteristic properties of the hysteresis loop. It is shown that large coercive fields may be attrib…
Magnetic noises in rapidly quenched amorphous magnetic materials were examined. Magnetic noises are observed as the fluctuations of the induced voltage wave forms of the magnetic cores on every cycle of the alternating exciting field. Fe, Ni, and Co base alloys were tested, and the following results have been obtained…
Abstract The effect of ionizing radiation on the melting behavior of high‐density and low‐density polyethylene was examined with data obtained by differential scanning calorimetry. Melting temperatures and fusion endotherms were obtained after absorbed doses of gamma radiation up to 3 MGy. The changes in melting tempe…
The magnetostrictive properties of single crystal Tb.27Dy.73Fe2was examined under compressive loads up to 48 MP a. Magnetostrictions > 1.8 × 10-3were observed for stresses greater than 20 MPa. Magnetization and magnetostriction were calculated for the magnetization rotation model, which was extended to include cubic a…
Abstract The heat of fusion Δ H f of 66 nylon has been determined by use of the Clapeyron equation. Measurements of Δ H f and the unit‐cell parameters on molding pellets show that this material contains the α 2 crystal phase, which is less dense than the α 1 phase obtained by crystallization from solution. The value o…
The technique of extended electron energy loss fine structure (EXELFS) using an electron energy loss spectrometer fitted to a transmission electron microscope (TEM) has been applied to a study of the structure of the thin layer of amorphous alumina (Al2O3) which is formed on aluminium by anodic oxidation in neutral so…