Materials Literature
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The dielectric constants of ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$ were measured at 25.5\ifmmode^\circ\else\textdegree\fi{}C by a two-terminal substitution method on specimens cut from single crystal. The average dielectric constants thus obtained are: at 1 kc/sec parallel $a$ axis 13.3, parallel $c$ axis 11.9; at 2 Mc…
The uniaxial dipolar anisotropy in antiferromagnetic MnO and NiO aligns the two opposing sublattice moments in an easy (111) plane. The two normal modes for small oscillations of the sublattice magnetizations about a preferred direction within this plane are both nondegenerate and linearly polarized. The high-frequenc…
The net added fraction of thermally-generated atomic sites, $\frac{\ensuremath{\Delta}N}{N}$, has been measured, during equilibrium heating to near the melting point, in a coarse-grained copper bar of 99.999% purity. The linear thermal expansion, $\frac{\ensuremath{\Delta}L}{L}$, and the x-ray lattice expansion, $\fra…
The temperature and pressure dependence of the dielectric constant of a number of cubic halides and oxides with a broad range of dielectric constants have been determined. For low-$\ensuremath{\epsilon}$ compounds the dielectric constant increases with increasing temperature, whereas for high-$\ensuremath{\epsilon}$ c…
Reflectance data are presented for Si, Ge, GaP, GaAs, InAs, and InSb in the range of photon energies between 1.5 and 25 eV. The real and imaginary parts of the dielectric constant and the function describing the energy loss of fast electrons traversing the materials are deduced from the Kramers-Kronig relations. The r…
The torsional braid technique was used to monitor the changes in rigidity and damping characteristics of a polybenzimidazole as it changes from a thermoplastic polymer to a thermoset resin at about 450 degrees C. In an intermediate process the thermoplastic backbone of the polymer becomes flexible.
Article Der Einfluß mechanischer Zwillingsbildung auf die Entstehung der Walztexturen kubisch Hlächenzentrierter Metalle was published on February 1, 1963 in the journal International Journal of Materials Research (volume 54, issue 2).
Abstract An order of magnitude calculation is made to determine the activation energies involved in the recrystallization of serpentine to forsterite. The so-called “activation energy spectrum” showing the proportion of material with different activation energies is estimated.
Abstract Particle size distributions in samples of Belle Fourche, Wyoming, Aberdeen, Utah, and Cheto bentonite were obtained by a centrifugation technique. From these distributions and the clay density the number of particles per gram was calculated for the different samples. Then the clays were mixed in different pro…
Almost all of the fibre tip present (about 3% by weight) in a batch of scoured wool was removed during processing to cloth : 70% was removed by the card, 16% by the Noble comb, and the remainder appeared as fly or droppings during drawing, spinning, and weaving.
The resonance absorption of the incident light in thin metal films, which is to be considered as an example of the so-called plasma resonance, is studied. This absorption is caused by the mechanism proposed by Ferrell, namely, by the excitation of surface (bounded) plasmons by light and therefore corresponds to an inv…
With so few accidents in the Atomic Energy Industry, new concepts and procedures of interest to the Health Physics profession will result from a critical analysis of each major radiation accident. A brief description of the reactor, its purpose, and operating history prior to the accident is followed by a comprehensiv…
The transformation of quartz at 1560°C was investigated by X‐ray techniques. The effect of particle size (and grinding) on the integrated peak intensities of the quartz powders was evaluated. The formation of a so‐called nonquartz layer of preferably nonquartz phase on quartz crystals was encountered after 5 hours of…
Abstract A study of the surface morphology of vermiculites from several different sources by the electron microscope has indicated that, unlike the smooth surfaces of micas, the vermiculite surfaces show micromorphological structural variations such as small humps, prominent crystallographic steps on the basal cleavag…
A résumé of the methods of production of non-woven (bonded fibre) fabrics is given. Measurements of the following physical properties have been carried out on a range of commercially available parallel-laid, cross-laid, random-laid, composite, and perforated non-woven fabrics: weight, thickness and density; tensile st…
pseudomalachite, Cus(P04)~(0H)4 is monoelinic, space group P21/c, with ao=4"47, b0=5"75, c0=17.08A; fl=91 07'.
The Zeeman splitting for Cl 35 quadrupole resonance in a single crystal Ba(ClO 3 ) 2 ·H 2 O in a high magnetic field (about 6000 oe) was studied in detail by using the proton signal enhancement due to a crossing of the quadrupole resonance frequencies of chlorine nuclei and the magnetic resonance frequencies of proton…
Abstract Single crystal X-ray and electron diffraction studies were carried out to examine the thermal transformation sequences of pyrophyllite and talc, respectively. The results showed that both minerals transformed topotactically. No dehydroxylated talc phase was observed, while an anhydride of pyrophyllite was obt…
Abstract Observations on the x‐ray scattering by ball‐milled cellulose and cellulose derivatives, amorphous oligosaccharides, and Fortisan H are reported and an approximate shape is established for the scattering curve of the noncrystalline component of celluloses. Using this shape measurements have been made of the m…
Abstract Mineralogical and chemical properties of Madison soil derived from quartz mica schist reflected the degree of weathering. The Madison soil had sandy surface horizons and clayey B horizons. The clay in surface horizons contained more mica than clay in the subsoils; a maximum of about 40 per cent mica in the co…