Materials Literature
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Abstract Measurements of the specific heat of configurationally ordered and disordered FeCo between 1.2 and 4.2 °K are presented. The coefficients of the electronic and harmonic phonon contributions decreased on ordering (by 16% and 20%, respectively). The effects on the electronic term are mainly associated with a ch…
Abstract Single crystals of linear polyethylene, prepared from a dilute xylene solution, were annealed below their melting temperature under atmospheric and 6 kbar pressure. In order to preserve the identity of the single crystals, they were suspended in an inert solvent medium, silicone oil and ethanol, during anneal…
SUMMARY It is demonstrated that the only requisite for a true three‐dimensional image is the presence of parallax in the stereo‐pair. This parallax is introduced into electron micrographs by tilting the specimen between exposures. After deriving the usual parallax equation several examples of the use of stereo‐measure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of porphyrins. IV. Behavior of di- and tetrahydroporphyrins under alkaline conditions. Direct observation of the chlorin-phlorin equilibriumH. W. Whitlock and M. Y. OesterCite this: J. Am. Chem. Soc. 1973, 95, 17, 5738–5741Publication Date (Print):August 1, 1973Pub…
Results of Diamond and Wert on the kinetics of the reorientation of carbon pairs in nickel are used to demonstrate that the low activation energy reported by Massaro and Petersen for diffusion of carbon in nickel at 350–-700°C cannot be explained by a change in the mechanism for the lattice migration of carbon. Bounda…
Magnetization measurements were made on a single crystal of ferromagnetic MnAlGe from 4.2 K to 350 K in order to determine the uniaxial magnetic anisotropy constant K 1 . The saturation moment and K 1 extrapolated to 0 K are 1.70 µ B /Mn and 9.7×10 6 erg/cc, respectively. The observed temperature dependence of K 1 , a…
The thermal expansion coefficients of the corundum structure oxides Ti2O3 and V2O3 were measured by elevated-temperature x-ray diffraction techniques, the former to 300 °C and the latter to 1000 °C. Compared with corundum, both of these oxides exhibit deviations in their thermal expansion behavior which may be attribu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConversion of dihydridodiammineboron(III) borohydride to ammonia-borane without hydrogen evolutionErwin MayerCite this: Inorg. Chem. 1973, 12, 8, 1954–1955Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1973http…
The magnetization and the Mössbauer effect were studied for Tm2Fe17 as a function of temperature in the range 4.2–350 K. The results indicate a magnetic phase transition near 72 K.
Abstract The storage and loss shear moduli, G , and G ˝, have been measured for solutions of three samples of poly‐γ‐benzyl‐ L ‐glutamate with molecular weights from 16 to 57 × 10 4 , by use of the Birnboim‐Schrag multiple‐lumped resonator. The frequency range was 106 to 6060 H z , the concentration range 0.0015–0.005…
Fission fragment tracks produced on prepared surfaces of uranium dioxide were observed by replica electron microscopy. Several statistical analyses and measurements were performed on the observed tracks to be compared with theoretical studies of a fission fragment passing through a stopping medium. A temperature distr…
Abstract Approximately 5% of all organic compounds are transformed at their melting point into liquid crystals—thermodynamically stable, anisotropic liquids which in contrast to isotropic melts appear turbid and are also known as mesophases. Such melts are classed as smectic, nematic, and cholesteric liquid crystallin…
The multiphonon relaxation process has been studied in the host crystals YV${\mathrm{O}}_{4}$, YAs${\mathrm{O}}_{4}$, and YP${\mathrm{O}}_{4}$ using the rare earths ${\mathrm{Ho}}^{3+}$, ${\mathrm{Er}}^{3+}$, ${\mathrm{Eu}}^{3+}$, and ${\mathrm{Pr}}^{3+}$ as probes. Lifetimes were measured with the phase-shift techniq…
BaFe12O19 particles were prepared by chemical precipitation and ordinary powder metallurgy methods. These particles were oriented in paraffin wax and the angular variation of coercive force was measured. By using the modified equation of Buessem et al., its variation was analyzed. It was found that reverse-domain nucl…
Stress-strain data were obtained over a wide range of grain sizes for brass, copper and aluminium. A Hall-Petch relation was found not to describe work hardening in the cases of copper and aluminium. An approach to poly-crystal work hardening, based in part on Ashby's concepts, was also unsuccessful in describing the…
Abstract The empirical pseudopotential method is used to compute the band structure, density of states, and reflectivity of hexagonal zinc oxide. The local approximation is assumed, on the basis of recent photoemission experiments which showed that the zinc core 3d band lies deep below the valence band. The calculatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectric field effects on oriented molecules and molecular crystalsRobin M. HochstrasserCite this: Acc. Chem. Res. 1973, 6, 8, 263–269Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1973https://pubs.acs.org/doi/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of octaethylporphyrin. Comparison with other free base porphyrinsJoseph W. Lauher and James A. IbersCite this: J. Am. Chem. Soc. 1973, 95, 16, 5148–5152Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1…
Abstract PACS, a computer program to simulate very slow settling of rigid equal spheres into a randomly packed bed, is described. Simulated packings of 6,000, 10,000, and 15,000 spheres are anisotropic. Mean void fraction is 0.42 and mean number of nearest neighbours 6.0. There are numerous cases of four spheres arran…
SUMMARY This paper is concerned with methods for obtaining three‐dimensional (3D) information from scanning electron microscope (SEM) images. It may come as a surprise that this topic merits separate discussion, because, it is generally accepted that every SEM image of a rough surface using the secondary electron emis…