Materials Literature
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It is shown experimentally that the geometry (i.e., the loop shape) of weftknitted fabrics is controlled by loop length, fibre type and properties, and method of relaxation. A theoretical study indicates that, for given end conditions, the shape taken up by a deformed elastic rod depends on the ratio of its flexural a…
Magnetic susceptibility measurements have been made on Pr2O3, PrO1.72, PrO1.83, and PrO2 from liquid-helium to room temperatures. The results are interpreted in terms of the crystal fields acting upon the cation for Pr2O3 and PrO2. For these two compounds, D3d symmetry was assumed for the disposition of oxygen ions ab…
The a‐c electrical conductivity of and was measured from 800° to 2000 °C. The two systems are similar. The conductivity maximum was found near 12 mole % in both zirconia and hafnia.
The system CdS ‐ In 2 S 3 ‐ Tm 2 S 3 has been investigated with the objective of obtaining for physical studies semiconducting crystals with high rare earth content. The new compounds CdR 2 S 4 and CdR 2 Se 4 , where R represents the rare earths of small ionic size, have been found to have the spinel structure. Thuliu…
Thin films of barium titanate were synthesized by the simultaneous deposition of the barium and titanium oxides evaporated by electron bombardment. The oxides were reacted on a substrate to form barium titanate during deposition. The reaction was carried out in an oxygen atmosphere at a substrate temperature in excess…
The cation distribution of synthetic spinel powder of grain size ≤ 50 μ was redetermined by means of neutron diffraction experiments. The oxygen parameter found by Bacon (1952) has been confirmed, but, in contradiction to Bacon, the degree of inversion amounts to about 10 to 15 %, and depends upon the thermal history…
C. F. Timberlake, J. Chem. Soc., 1964, 1229 DOI: 10.1039/JR9640001229
The fracture of alloys in certain chemical environments at static stresses appreciably below those that would cause fracture in the absence of the specific environment, has been the subject of an increasing number of experimental investigations over the last decade. It would be impossible in the present context to rev…
For many polymers an effective glass transition Tg′ can be defined via a change in slope of logσ[Ω−1cm−1] vs T−1[°K−1]. Measurements for dry cellulose acetate (CA), previously doped by soaking (48 h) in 0.1M alkali-chloride solutions, indicate that Tg′ depends on ion and polymer properties. A model based on fluctuatio…
Abstract Improved methods for the synthesis of p ‐bis(dimethylhydroxysilyl)benzene are described. This useful monomer was prepared from p ‐bis(dimethylhydrogensilyl)‐benzene which was obtained in 60–70% yields from p ‐dibromobenzene and dimethyl chlorosilane by use of an in situ Grignard technique. The great reluctanc…
Abstract An Se‐ und Te‐Einkristallen wurde das Reflexionsvermögen R bei Polarisation des Lichtes parallel und senkrecht zur Kettenrichtung gemessen. Der Charakter des Reflexionsspektrums ist bei den Elementen ähnlich; R ist in beiden Fällen bei paralleler Polarisation größer als bei senkrechter. Die verschiedenen Maxi…
B. J. Hathaway and D. G. Holah, J. Chem. Soc., 1964, 2400 DOI: 10.1039/JR9640002400
Neutron diffraction studies have been carried out on powder samples of NiZrH3 and NiZrD3. The x-ray space group and heavy atom positions are confirmed. Hydrogen atoms are located in 4 fold and 8 fold positions of the orthorhombic space group Cmcm. The 8 fold hydrogen atoms have three Zr and one Ni close neighbor while…
Lattice parameters of the high-pressure forms of the alkali halides were determined. The lattice parameters were used to compare the lattice energies of the NaCl and CsCl type structures at the transition pressure. An analysis of the effect of experimental uncertainties on the calculated lattice energies showed that i…
New x‐ray intensity data from synthetic beryllium oxide crystals have verified the distorted wurtzite‐type structure previously reported by Jeffrey, Parry, and Mozzi. The oxygen z parameter obtained from the refinement is compared to 0.375 for the undistorted structure. The resulting structure has a bond distance of p…
The liquidus, solidus, and subsolidus in the system MgO‐MgCrz04 were redetermined. Petro‐graphic studies indicated that 47 wt% Cr203 could enter into the periclase lattice at about 235OO C. X‐ray and optical data showed that the solid solution decreased to 32 wt% Cr202 at 2165OC, 11 wt% at 1600°C, 5 wt% at 1400°C, 2.5…
The volatile products of the reaction between a molecular beam of room-temperature chlorine and a polycrystalline nickel surface have been identified; their formation rates have been measured by a mass-spectrometric technique at surface temperatures between 1000° and 1600°K and beam fluxes equivalent to pressures of 1…
Abstract An einem SrTiO 3 ‐Einkristall wurde im Temperaturbereich von 15 bis 80 °K die Dielektrizitätskonstante in Abhängigkeit von einer überlagerten Gleichspannung untersucht. Dabei wurden Maxima der Dielektrizitätskonstanten festgestellt, wie sie auch bei normalen Ferroelektrika, die einen Phasenübergang zweiter Or…
J. Bregman, K. Osaki, G. M. J. Schmidt and F. I. Sonntag, J. Chem. Soc., 1964, 2021 DOI: 10.1039/JR9640002021
By examining passivated silicon integrated circuits in the scanning electron microscope, the surface contours of p‐n junctions have been mapped, potential drops across integrated resistors have been observed, and physical characteristics of the oxide surface, evaporated leads, and bonded gold wires have been determine…