Materials Literature
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The morphology of the solid‐liquid interface and the contact angle configuration of the liquid alloy droplet determine the direction of growth of crystals prepared by the vapor‐liquid‐solid (VLS) technique. There are four different processes by which both growth kinks and branches can be formed. A change in solid‐liqu…
Abstract The dielectric constant and the conductivity of polycrystalline ferrites are measured at temperatures between 100 and 400°K and at various frequencies. Different activation energies are obtained for the d.c. and the h.f. conductivity of the samples. Both positive and negative temperature coefficients of the c…
The absorption spectrum of HNCO between 2000 and 2800 Å has been photographed with high resolution and absorption paths of up to 8 m atm. None of the bands are completely sharp, but many show coarse rotational structure. Long progressions of bands are assigned to excitation of an NCO bending vibration. The rotational…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of and interrelation between some .mu.-peroxo binuclear cobalt complexes. II.Masayasu Mori, John A. Weil, and Mibuo IshiguroCite this: J. Am. Chem. Soc. 1968, 90, 3, 615–621Publication Date (Print):January 1, 1968Publication History Published online1 May 2002Publis…
Abstract The viscosity and light transmittance of montmorillonite suspensions saturated with Na + , Ca ++ and known mixtures of these ions in the adsorbed phase were investigated. Introduction of a small fraction of Na + (10% – 15%) into the exchange complex of Ca—clay, does not result in the breakdown of the tactoids…
H. E. Hallam, R. Inst. Chem., Rev., 1968, 1, 39 DOI: 10.1039/RR9680100039
Raw kaolinite has been investigated as a possible starting material for low-temperature hydrothermal growth of zeolites and felspathoids. It proved to be convenient and versatile in this role, being readily transformed into a range of known and new zeolites and salt-inclusion felspathoids with a Si/Al ratio around 1·0…
Abstract The optical absorption in rutile single crystals doped with Nb and other impurities as well as partially reduced is investigated in the temperature range 10 to 900°K. It is shown that the spectrum and the magnitude of the optical absorption by current carriers can be satisfactorily explained in terms of the s…
The electronic, e.s.r., and i.r. spectra, and some magnetic moments of a number of stable penta-ammine complexes of the copper(II) ion are reported. The spectra are shown to be consistent with a square-based pyramidal configuration for the Cu(NH3)52+ cation, but not consistent with a trigonal bipyramidal configuration…
Abstract The light absorption spectra of monoionic montmorillonite suspensions with Li, Na, K, Rb, NH 4 , Cs, Mg, Ca and Ba as adsorbed ions were studied in the wavelength range 200–800 mμ. Theoretical analysis of the spectra showed that in the visible range, only scattering is responsible for light intensity attenuat…
Linear polymer of acetylene was prepared in which the oxygen content was as low as 0.7 %. The electrical conductivity and Seebeck voltage but not the energy gap depended on the extent of oxidation of the samples. Adsorbed donor and acceptor gases affected electrical conductivity but not e.s.r. spin assay. It was concl…
A new method of measuring the charge density on a dielectric surface has been developed. An electrode is vibrated in the surface field to produce a signal that is displayed on an oscilloscope, or measured with a VTVM. A bias is then applied across the vibrating and fixed electrodes sufficient to produce zero output si…
The nucleation, early growth, and structure of Ni‐P on SnCl 2 ‐ PdCl 2 activated dielectric substrates were studied. The SnCl 2 ‐ PdCl 2 treatment was found to provide small catalytic sites on the substrate, serving as the nuclei for Ni‐P growth. The average diameter of catalytic sites was estimated to be less than 10…
Raman and infrared spectra have been measured of a number of transition-metal complexes of the form [MO2X4]n–(M = MoVI, WVI, or VV; X = F, Cl, or ½ Ox), and a cis configuration of the oxygen ligands has been found for these d0-species. The results are compared with those obtained for trans-dioxo-complexes and the díff…
Using the phase diagram and a simple solution model, a subliquidus miscibility gap was estimated for the B 2 O 3 ‐SiO 2 system. The predicted coexistence boundary, showing a consolute temperature of 520°C, was flat and symmetrical and extended across the complete binary. Gradient furnace heat treatments of selected co…
Chloramphenicol-resistant strains of Staphylococcus aureus contain an inducible enzyme which inactivates chloramphenicol by acetylation in the presence of acetyl coenzyme A. The products of acetylation are chromatographically indistinguishable from those obtained with chloramphenicol-resistant Escherichia coli harbori…
Abstract ESR spectra of cupric ions in borate, silicate, and phosphate glasses were analyzed by the LCAO MO method of Maki and McGarvey. The covalency of the B 2g π‐orbital was found to change with the bond strength of the network‐former. Particularly it reflected clearly the weakening of BO bonds in alkali borate gl…
Trap levels in thin layers (500 to 6000Å) of Al2O3 and various types of SiO2, all on Si substrates, were investigated using thermoluminescence glow curves in a temperature range from 30° to 300°C. Layers were studied which had been exposed to doses of Co60-gamma radiation up to several Mrads. Previously unirradiated S…
Abstract A method of preparation has been developed which allows the growth of large homogeneous single phase ingots of such alloy systems as GeTe‐MnTe, GeTe‐SnTe, etc. … We have measured the thermoelectric power and the thermal conductivity of both GeTe and two alloys of the system Ge 1− x Mn x Te, in the temperature…
In 1958 exposure tests were started in Sweden to gain knowledge of the natural patination and the corrosion behavior of copper and copper alloys when used outdoors. The investigation covered 36 alloys in sheet or rod form: 5 coppers, 20 brasses, 5 phosphor bronzes, 1 silicon bronze, 1 aluminum bronze, 1 cadmium bronze…