Materials Literature
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Reactively sputtered vanadium dioxide films have been analyzed to determine the relation between their electrical and structural properties. The structure of the thin films was determined by x-ray diffraction, reflection electron diffraction, and electron microscopy of carbon replicas of the film surfaces. The various…
Raman spectra, with polarizations, are presented for CER–VIT, fused silica, ULE glass, and a Corning heat-absorbing glass. The spectra of the three amorphous glasses are quite similar. The spectra of these glasses indicate a small scattering unit of low symmetry, perhaps a distorted SiO4 tetrahedron. The spectrum of C…
Abstract Montmorillonite, identified by X‐ray diffraction, is the predominant clay mineral in the B horizons of four widely separated California soils (Henneke, Dubakella, and Fancher series and one from the New Idria area) derived from serpentinite. The < 0.2µ fractions contain respectively, 81, 68, 71, and 33% mo…
Abstract Die tert.‐Butylate (CH 3 ) 3 COM (M K, Rb, Cs) kristallisieren nach röntgenographischen Untersuchungen der Kristallpulver kubisch‐primitiv mit den Gitterkonstanten a = 8.47 5 Å (K), 8.61 0 Å (Rb) und 8.90 2 Å (Cs) und vier Formeleinheiten je Elementarzelle. Sie bilden tetramere Struktureinheiten dadurch, da…
According to Tsutsumi the X-ray non-diagram line K β' and the asymmetry of the K α line are derived from the exchange interaction between the electrons of the incomplete 3 d shell and those of the incomplete inner shell owing to the emission of the X-rays. Then the variations with valences are expected in the energy d…
A single beam spectrophotometer has been developed for the measurement of spectral attenuation coefficients of very low loss optical glasses in the wavelength range 400-1000 nm. The instrument has an accuracy to ±0·00005 cm −1 when sample thicknesses of 20 cm are used. The basic stability of the instrument and the sou…
Vapor deposition was used to obtain homogeneous glass films of several BaO‐SiO 2 compositions in the region of the metastable miscibility gap. The films were electron‐beam heated in the electron microscope, and the phase separation process was observed. At low BaO contents, separation was characterized by the appearan…
The martensite transformation which occurs either thermally or by plastic deformation in the equi-atomic Ni-Ti alloy has been studied in detail by transmission electron microscopy. The transformation occurs by alternate simple shears on {112} planes and in ⟨111⟩ directions of the parent B2 structure. These shears conv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrin studies. XXXVII. The interpretation of porphyrin and metalloporphyrin spectraAlsoph H. Corwin, Arthur B. Chivvis, Robert W. Poor, David G. Whitten, and Earl Wayne BakerCite this: J. Am. Chem. Soc. 1968, 90, 24, 6577–6583Publication Date (Print):November 1, 1968Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal chemistry of the rare earth sesquisulfidesArthur W. Sleight and Charles T. PrewittCite this: Inorg. Chem. 1968, 7, 11, 2282–2288Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 1968https://pubs.acs.or…
Oliver E Nelson; THE WAXY LOCUS IN MAIZE. II. THE LOCATION OF THE CONTROLLING ELEMENT ALLELES, Genetics, Volume 60, Issue 3, 1 November 1968, Pages 507–524, htt
Abstract A leucine-binding protein isolated from Escherichia coli K12 has been purified by DEAE-cellulose and hydroxylapatite cellulose chromatography and its chemical and physical properties were determined. The purified protein was crystallized by adding 2-methyl-2,4-pentanediol. The crystalline protein was homogene…
Mixtures of PbO and silicic acid were fired at 710°, 820°, and 910°C for periods up to 1000 hr in air. At each temperature cristobalite and tridymite crystallized rapidly, with the greatest development in samples with compositions of 1 mole PbO to 50 and 60 moles SO 2 . At 820° and 91O°C tridymite continued to crystal…
Abstract The problem of preventing calcium sulfate scale deposition has become increasingly important in the last few years due to the increasing use of waterflood as a means of secondary recovery. Many methods have been proposed for removing or preventing scale deposition. A few chemicals and treatment methods have b…
Electron diffraction contrast experiments have been performed to crystallographically characterize the dislocation loops which form during 1100°C annealing of neutron-irradiated tungsten. These experiments show that the loops are essentially pure edge in orientation, lying on or near {111} habit planes and having a/2⟨…
The dielectric and infrared (lattice dynamic) properties of the cubic IV-VI compound semiconductors are reviewed. The values of macroscopic dynamic ionic charge are found to be appreciably larger than the corresponding values for alkali halide and zincblende type crystals. The large values of e(T)*, which arise from t…
Abstract It can be stated that the effect of carbon black in a rubber vulcanizate with regard to dynamic properties can be explained by assuming physical adsorption of rubber on the black surface. The effect can be represented by assuming an adsorbed layer having different properties from the bulk rubber taking the la…
Abstract The molecular weight dependence of the adsorption of polybutadiene on carbon black from a poor solvent, n-heptane, and bulk, i.e. , the phenomenon of “bound rubber”, was investigated. For narrow distribution polymers the adsorption is proportional to M n , where n = 0.14 for adsorption from n -heptane solutio…
Abstract Precise measurements of the solubility of sulphadiazine in water, dimethylformamide (DMF), and a range of mixtures of these solvents have been made at 20°, 30°, and 40°. The solubility of sulphadiazine in the mixtures increases with their DMF content. The partial molar heats and entropies of solution decrease…
Composites made up of MnBi needles embedded in bismuth single crystals are grown from eutectic melts by both Czochralski and zone-melting techniques. The galvanomagnetic properties of the composite are determined mainly by the bismuth matrix. Magnetic measurements reveal a magnetic phase with an anisotropy field of mo…