Materials Literature
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Magnetic susceptibilities of Gd2O3 and Dy2O3 have been studied from about 300° to 1500°K and 300° to 1250°K, respectively. The paramagnetic susceptibility data of both oxides obey the Curie-Weiss law. This information supports the suggestion that the small deviations from the Curie-Weiss law found in gadolinium and dy…
Monodisperse precipitates of silver bromide were made which had average grain sizes in the range of 0.1 to 1.0 μ. The optical transmittance of dilute turbid suspensions of the grains was measured over the wavelength range from 300 to 700 mμ. Suspensions in water and in gelatin coatings were measured and the results co…
Reflection spectra of Co, Ni, Cu, Zn, and metal-free phthalocyanines have been measured. The Davydov splitting of the main absorption peak in the metal compounds correlates with the relative tendencies of the metals to out-of-plane bonding. Photoconduction response curves have been measured between 1500 and 300 mμ for…
Self-diffusion coefficients in platinum have been measured, in the temperature range between 1250°C and 1725°C, by measuring the decrease of activity at the surface of the specimen during diffusion. The experimental results can be summarized by the following relationship: D = 0.22 exp (−2.89 ev/kT) cm2 sec−1. The cons…
Raman intensities and frequencies of molten potassium bisulfate, obtained in the temperature range of about 300° to 700°C, provide evidence for the reactions 2HSO4−→S2O72−+H2O and S2O72−→SO42−+SO3. Between 300° and 620°C the HSO4− concentration, inferred from Raman intensities, decreases rapidly. Simultaneously, the S…
The lathyrogenic effect of INAH in the chick embryo may be measured by the increase in the extractibility of collagen from the bones with 1 M NaCl. Incubation of these bones in vitro with carbonyl compounds diminishes the amount of extractible collagen; with D-L-glyceraldehyde the reversal of the INAH effect is comple…
A1-3.85% Cu single crystals were studied by means of the back-reflection divergent X-ray beam method after solution treatment, various modes of quenching and various stages of age-hardening. A complete strain analysis was developed by which the principal strains in a crystal or polycrystalline material can be determin…
The aggregation of pairs consisting of divalent cations and cation vacancies, in KCl containing Sr 2+ , KCl containing Ba 2+ and NaCl containing Mn 2+ , has been studied by dielectric absorption measurements. Each of the pairs forms a dipole and the decay with time of the dipole concentration at various temperatures,…
The infrared absorption spectrum of peroxy titanium sulphate has been studied in the region from 2 to 23 μ and the various bands are characterized. The sulphate group in the compound is shown to have C 2v symmetry, indicating its bidentate nature.
The role of cerium in the suppression of gamma‐ray induced coloration in glass has been found to depend on the relative concentration of Ce 3+ to Ce 4+ ions as well as on the total cerium content. In a borate glass having high ultraviolet transmission, it has been found that both Ce 3+ and Ce 4+ ions are necessary to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHexafluorides of Molybdenum, Tungsten, and Uranium. I. Reactions with Nitrous and Nitric OxidesJ. R. Geichman, E. A. Smith, S. S. Trond, and P. R. OgleCite this: Inorg. Chem. 1962, 1, 3, 661–665Publication Date (Print):August 1, 1962Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the Reactions of Diethylenetriamineaquoplatinum(II) Ion with Different LigandsHarry B. Gray and Richard J. OlcottCite this: Inorg. Chem. 1962, 1, 3, 481–485Publication Date (Print):August 1, 1962Publication History Published online1 May 2002Published inissue 1 Au…
The respiratory coefficient, expressed here as respiration per unit of chlorophyll, of six clones (five species) of diatoms was measured at temperatures of 5°, 10°, 15°, 20°, and 25 °C. The acclimatized cultures used were grown at each of these temperatures that supported sufficient growth. Considering any one of the…
The relation between the elastic moduli and temperature from room temperature to about 1300°C was determined for a group of vitreous silica specimens by a dynamic resonance method. All the curves were approximately parabolic in shape, reaching a maximum near 1050° to 1200°C. At the maximum value, Young's modulus was m…
A general method is developed for calculating electron diffraction intensities when many simultaneous reflections are considered. The exponential function of a `scattering matrix' is used, and numerical calculations are easily systematized and performed for various thicknesses. The generality and utility of the method…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTα,β,γ,δ-Tetra-(4-pyridyl)-porphine and Some of its Metal ComplexesEverly B. FleischerCite this: Inorg. Chem. 1962, 1, 3, 493–495Publication Date (Print):August 1, 1962Publication History Published online1 May 2002Published inissue 1 August 1962https://pubs.acs.org/doi/10.102…
Cyclotella nana Hustedt, a small centric diatom requiring vitamin B 12 , was tested as a potential assay organism for that vitamin. Dose–response curves, measured by optical density and cell count, showed a linear relation between growth and B 12 concentration between 0 and at least 2 μμg/ml of the vitamin. Since the…
Thermal and electrical conductivity measurements have been made between 2 and 90°K on samples of copper containing 0.5, 1 and 2 at. % platinum, of copper containing 2 and 4 at. % silicon, and of silver containing 2 at. % platinum and aluminium respectively. The lattice components of their thermal conductivities are de…
Stress-corrosion cracking has been determined as the cause of failure of carbon steel tanks in agricultural ammonia service. Effects of ammonia contaminants, such as air, water, carbon dioxide, oil, etc. on failure rates were studied. In general, air contamination increased stress-corrosion cracking and water in small…
The results of an experimental study of the temperature and strain-rate dependence of τIII for Cu–Zn alloys are described and interpreted in terms of Seeger's theoretical analysis of τIII. The values of the stacking-fault energy, γ, derived in this way are compared with the estimates of γ for the same alloys obtained…