Materials Literature
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Abstract The i.r. spectra of interlamellar kaolinite complexes with formamide, N-methylformamide and dimethylformamide have been examined. The spectra show that the amides hydrogen-bond, through the C=O group of the amide to the inner surface kaolinite hydroxyls and decrease the intensity of the kaolinite ν (OH) bands…
Abstract The optical absorption spectra of trivalent thulium in single crystals of YVO 4 and YPO 4 were measured in the range from 5000 to 29000 cm −1 including the Zeeman effect at 85, 4.2, and 2K. Furthermore the fluorescence spectrum in YVO 4 between 19000 and 25000 cm −1 was investigated. Some special features of…
The effect of pressure to 175 kbar has been measured on the spin state of Fe(II) in bis- and trisphenanthroline complexes, using Mössbauer resonance and optical absorption. The bis complexes can be classified according to the degree of back bonding to the nonphenanthroline ligands. Compounds with halide ligands are hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding, solvent polarity, and the visible spectrum of phenol blue and its derivativativesJ. FiguerasCite this: J. Am. Chem. Soc. 1971, 93, 13, 3255–3263Publication Date (Print):June 1, 1971Publication History Published online1 May 2002Published inissue 1 June 1971h…
Physical, electrical, and optical properties of selected compositions within the lead lanthanum zirconate‐titanate (PLZT) system are presented, including chemically and thermally etched microstructures, examples of residual porosity defects, temperature dependence of remanent polarization and coercive field, lateral s…
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…