Materials Literature
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The binding states, adsorbate densities, and desorption kinetics of hydrogen on the (110), (111), and (100) crystal planes of tungsten are examined. There are two atomic states on the (110) plane and four atomic states on the (111) plane. Saturation hydrogen densities are approximately equal in the major states on bot…
A three-dimensional electron density map has been calculated at 6 A resolution for a human γG1 immunoglobulin molecule. X-ray diffraction data have been collected for the native protein crystals and for three heavy atom derivatives prepared by soaking crystals in p-chloromercuribenzenesulfonate, Hg(CN)2, and PtCl6=. T…
The effect of the following factors on the mechanism and rate of pitting corrosion is discussed: composition of the corrosive medium, composition and structure of the metal or alloy, temperature, pH, heat treatment, cold working, and structure of the oxide film on passivated metals. The kinetics of pit growth, sites s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiamond growth rates and physical properties of laboratory-made diamondH. M. Strong and R. M. ChrenkoCite this: J. Phys. Chem. 1971, 75, 12, 1838–1843Publication Date (Print):June 1, 1971Publication History Published online1 May 2002Published inissue 1 June 1971https://pubs.…
The migration of Frenkel excitons in molecular crystals is studied theoretically, starting from the microscopic equations of motion for the exciton density. The migration process is found to be diffusionlike on a long time scale for all temperatures as long as the exciton–phonon coupling is present. If there is no exc…
Abstract Multicomponent oxide glasses can be produced not only by melting methods but also by hydrolysis and condensation of alkoxide complexes with several metals. This requires temperatures only up to the transformation range of the glass in question, usually 500–600 °C. The process does not pass through the molten…
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Phase equilibrium studies have been carried out on the composition join NaAlSiO4-CaCO3-H2O with 25 wt per cent H2O at 1 kb pressure in the temperature range 600–960 °C. Liquid, in equilibrium with crystalline phases and a sodic, aqueous vapor phase persists across the join down to temperatures of about 600 °C. Fractio…
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The infrared and Raman spectra of anhydrous crystalline Li2CO3 and Na2CO3 were measured at 300 and at 80°K. Bands observed in the vibrational spectra of Li2CO3 were assigned according to the C2h factor group symmetry. The doublet structure observed for each of the internal modes in the spectra of Na2CO3 was interprete…
A simple physical model has been used to derive an approximate theory of the double extraction of uniformly generated electron-hole pairs from a photoconductor layer with noninjecting contacts. The theory predicts 4 regimes of current versus applied voltage behavior: (1) At low voltage, I∝V. (2) At higher voltage, a t…
Single crystals of the wide bandgap semiconductor stannic oxide, SnO2, have been grown and studied electrically. A chemical vapor deposition technique using chlorine transport, no inert carrier gases, and low pressure has been used to grow stannic oxide crystals of higher purity and with almost an order-of-magnitude h…
Refined structures of eight natural garnets [Cr-pyrope, almandine, spessartine, Mngrossular, grossular, uvarovite, goldmanite, and andradite] are compared with that of synthetic pyrope to determine the effects of the substituent cations on polyhedral interactions,bond lengths, and angles. The Si-O bonds in these garne…