Materials Literature
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Very hard and durable single layer antireflection coatings for Ge and Si have been made which result in a peak transmittance of better than 98% at any desired wavelength in the infrared up to about 15μ. Silicon monoxide makes an excellent antireflection coating for silicon and germanium in the near infrared, but canno…
Phase equilibrium studies in the system NaAlSiO ~4~ -KAlSiO ~4~ at subsolidus temperatures have demonstrated that a solvus, or miscibility gap, is present and in a general way it is similar to the solvus between albite and orthoclase. At low temperatures the miscibility gap extends in composition from Na ~3~ KAl ~4~ S…
Molecular order and motion in isotactic and atactic polypropylene molecules have been studied by proton magnetic resonance methods over the temperature range 77–400°K, and by x-ray diffraction. It is shown that some motion persists at the lowest temperatures, and becomes pronounced in the temperature interval 77–110°K…
Employing concepts first applied to textile fibers by Meyer and Lotmar in calculating the elastic stretch modulus of the crystalline domain of cellulose, the moduli of crystalline polyhexamethylene adipamide (α form), and polyethylene terephthalate have been derived. The treatment employs interatomic force constants f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNotes - Base Strengths of Some AlkylhydrazinesRichard HinmanCite this: J. Org. Chem. 1958, 23, 10, 1587–1588Publication Date (Print):October 1, 1958Publication History Published online11 June 2003Published inissue 1 October 1958https://pubs.acs.org/doi/10.1021/jo01104a629htt…
The rate of change of magnetic moment with composition in several ferromagnetic cobalt-rich and iron-rich alloys of these systems has been derived from measurements of the variation of spontaneous magnetization with temperature. The measurements were made on the high-temperature face-centred cubic phase of the cobalt…
The adiabatic elastic moduli at 25°C for single crystal alpha-uranium are reported here as derived from measurements of high-frequency ultrasonic wave velocities. A detailed description is given of the specimens used, and of the technique employed for obtaining small plates of proper orientation suitable for the probl…
Abstract The tensile properties of an unfilled GR‐S rubber were measured with an Instron tensile tester at strain rates between 0.158 × 10 −3 and 0.158 sec. −1 and at fourteen temperatures between −67.8 and 93.3°C. The tensile strength and ultimate strain at the various strain rates and temperatures were superposed to…
The linear coefficient of thermal expansion of silicon, germanium, and indium antimonide has been measured in the range 4.2\ifmmode^\circ\else\textdegree\fi{}K-300\ifmmode^\circ\else\textdegree\fi{}K using an interferometric method. In the cases of silicon and germanium, these values are used to calculate the variatio…
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As a result of a wide variety of studies on photosynthesis in living plants and plant fragments, together with the development of photosensitive, photovoltaic junctions in inorganic crystals and the discovery and exploration of semiconduction in organic molecular substances, a suggestion has been made that the primary…
By means of absorption and photoconductivity measurements, the following band gaps were found: ${\mathrm{Na}}_{3}$Sb---1.1 ev; ${\mathrm{K}}_{3}$Sb---1.1 ev; ${\mathrm{Rb}}_{3}$Sb---1.0 ev; ${\mathrm{Cs}}_{3}$Sb---1.6 ev; and ${(\mathrm{NaK})}_{3}$Sb---1.0 ev. A model has been derived for the photoemission from these…
Abstract The beam of an electron microscope has been used to dehydrate single crystals of magnesium hydroxide to magnesium oxide. Electron diffraction photographs and electron micrographs were taken at various stages to follow the crystallographic and morphological changes which accompany decomposition. The decomposit…
Certain ZnS crystals show electroluminescence predominantly near the cathode. The major emission from Cu-activated crystals occurs as a burst of light when the exciting voltage is suddenly removed, as electrons flowing back toward the cathode to neutralize the barrier charge recombine with ionized luminescent centers.…