Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge distribution in large polyoxoanions: determination of protonation sites in vanadate (V10O286-)by oxygen-17 nuclear magnetic resonanceW. G. Klemperer and Wilfred ShumCite this: J. Am. Chem. Soc. 1977, 99, 10, 3544–3545Publication Date (Print):May 1, 1977Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydridorhodium(III) porphyrin and porphyrin rhodium(II) dimerH. Ogoshi, J. Setsune, and Z. YoshidaCite this: J. Am. Chem. Soc. 1977, 99, 11, 3869–3870Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published inissue 1 May 1977https://pubs.ac…
Densification rates are reported for 3 classes of porous glass materials: soot preforms made by flame hydrolysis, silica gel, and phase‐separated and leached borosilicate glass. Viscosity values obtained by fitting the densification data to the theory of Part I of the present study are in reasonable agreement with vis…
The thermal expansion coefficient and aqueous dissolution rate were measured for alkali phosphate glasses containing a third and fourth component. For a given series, both properties increased monotonically as the radii of the alkali ions increased. The observed expansion coefficients were in the range 99 to 286 × 10…
The effect of molybdate ions on the repassivation kinetics of iron has been studied by measuring anodic current transients following in situ film removal by abrasion. In solutions containing both chloride and molybdate ions, it was found that although pits initiate, they do not propagate when molybdate ions are presen…
Results of calculations of vibrational densities of states and of infrared and Raman spectra for relatively large model structures representing elemental amorphous semiconductors are presented and discussed. Models for four-coordinated (germanium-like), three-coordinated (arsenic-like), and two-coordinated (selenium-l…
The solar absorptance of a single ideal film on an idealized metallic substrate has been calculated as a function of its optical constants to determine the optimum parameters for selective absorber applications. High normal solar absorptances (>0.9) are possible for single uniform interference films if n < 1.5 and 0.2…
The equilibrium constants and rate constants for the formation of inclusion complexes of cycloheptaamylose with small inorganic anions were measured by a spectrophotometric technique and an ultrasonic relaxation technique respectively. The stability of the complexes of anions with cycloheptaamylose decreased. Comparis…
Successive phase transformations in ${\mathrm{K}}_{2}$Se${\mathrm{O}}_{4}$ at ${T}_{i}=130$ K and ${T}_{c}=93$ K were studied by the neutron-scattering technique. The superlattice reflections in the intermediate phase were found to be incommensurate with the lattice periodicity. The wave vector characterizing the refl…
This review is concerned mainly with conventional transmission electron micro scopy (TEM) and its application to mineralogy and geology. However, I indulge in some speculation at the end about new developments and how they might be used to advantage by the mineralogist. Although TEM became a routine tool of the physi…
SUMMARY A technique is described for obtaining clean cut surfaces on wood samples prepared for the scanning‐electron microscope.
By considering the variation of charge-transfer energy and of the intensity parameters across isostructural series it is concluded that charge-transfer mixing is of negligible importance in accounting for the intensity of the hypersensitive transitions of the trivalent lanthanides. The experimental relationship betwee…
Abstract Wave‐vector ( q )‐dependent energy loss functions, Im [−ϵ ⟂ (ω, q ⟂ )] −1 , and dielectric functions, ϵ 2⟂ (ω, q ⟂ ), of hexagonal boron nitride and graphite up to q ⟂ ‐values of almost one third of the Brillouin zone and up to energies of 40 eV were derived from electron energy loss measurements. The results…
A method for precise determination of the orientation of mierocrystals is described. Electron back-scattering patterns are observed on a fluorescent screen in a scanning electron microscope, and high precision is obtained by casting geo metrical shadows onto the screen to determine the point from which the back-scatte…
The concentration of ionic species in the solution in contact with hydrating tricalcium silicate (C 3 S) has been studied as a function of time and in the presence of admixtures. The ionic product for calcium hydroxide (CH) was calculated as a function of time and correlated with calorimetric measurements and crystal…
On the basis of the special symmetry of the rare-earth site in the Laves-phase cubic compounds $R{T}_{2}$ ($R$ is a rare earth, $T=\mathrm{Fe}, \mathrm{Co}, \mathrm{Ni}$) we predict the occurrence of a structural distortion which vanishes only when [100] is the easy magnetization direction. An extraordinary external s…
The resistivity, Hall effect and magnetic susceptibility have been measured as a function of temperature for the first row transition metal intercalates of niobium disulphide, M1/3NbS2 (M = Mn, Fe, Co, Ni), where the intercalate ions form an ordered superlattice. Metallic behaviour, associated with conduction in the n…
Abstract An electron microscope study of collagen fibrils from fixed tail tendons of rats has revealed that from some time shortly after birth until maturity, the fibril diameters have a bimodal distribution. The “two” types of fibril are indistinguishable in both transverse and longitudinal section. Unfixed specimens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative kinetics of high-temperature reaction between hydrogen sulfide and selected metal oxidesPhillip R. Westmoreland, James B. Gibson, and Douglas P. HarrisonCite this: Environ. Sci. Technol. 1977, 11, 5, 488–491Publication Date (Print):May 1, 1977Publication History…
High-voltage breakdown measurements were made in two similar particle contaminated coaxial test systems, one with AC and the other with DC voltages. Information is presented on the effects of particle size, shape, and material for both SF6and N2gases at pressures up to 15 atm in a plain coaxial gap and a coaxial gap i…