Materials Literature
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The viscosity of molten beryllium fluoride has been measured with coaxial-cylinder viscometers over five orders of magnitude (limits: 979°C, 28.6 P; 574°C, 2.24 × 106 P). Over the experimental range of shear stresses, BeF2 behaves as a Newtonian fluid. Like SiO2, its high-temperature analog, BeF2 shows an Arrhenius te…
The phase relationships in the systems $$NaF-H_{2}O$$ and $$NaAlSi_{3}O_{8}-NaF-H_{2}O$$ were determined between 600° and 900° C. at pressures up to 4 kb., and those in the anhydrous system $$NaAlSi_{3}O_{8}-NaF$$ were determined at 1 atm. The phases encountered were albite, villiaumite (NaF), liquid, and vapor. The l…
The electron spin resonance spectra of γ-ray-irradiated glassy and polycrystalline phosphorus pentoxide and alkali phosphates with molar ratios of phosphorus pentoxide to alkali oxide ranging from 3.33 to 0.625 have been observed at 10 and 35 Gcps and at 300° and 78°K. Well-resolved hyperfine doublets were observed in…
Alamosite, PbSiO 3 , has space group P 2/ n with cell parameters for the reduced cell a = 11.23 Å, b = 7.08 Å, c = 12.26 Å, and β = 113° 15′, with Z = 12. The structure has been determined using three-dimensional counterdiffractometer data. Refinement converged with R = 11.1%, including a number of reflections omitted…
Abstract
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…