Materials Literature
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Abstract From the general formalism of elastic x‐ray scattering and a few meaningful assumptions we have shown that for an atom, ∫ρ 2 d τ is an experimentally measurable quantity related to the intensity scattered by an element. We have labeled this quantity ( p ), the “average electron density.” If ψ obeys the virial…
Viscosity and thermal expansion have been measured for 12 series of lithium aluminosilicate glasses. The compositional dependency of the viscosity, glass-transformation temperature, dilatometric-softening temperature, and refractive index all exhibit an abrupt change in slope at an aluminum-to-lithium ratio between 1.…
The anodic behavior of copper in lithium hydroxide solution was investigated at room temperature under controlled potential conditions. The electrodes were either saturated copper amalgams or small polycrystalline wires. Particular attention was focused on the copper (I) region. Two layer‐planes of Cu 2 O were formed…
The nacreous layer in Gibbula, Calliostoma, Trochus and Haliotis is described on the basis of scanning electron microscopic studies. The central part of each nacreous tablet contains a significant amount of calcified organic matrix which is insoluble in a chromium sulphate and a 25% glutaraldehyde solution. In most ca…
Abstract Nonempirical LCAO MO SCF computations (in the ΔSCF formalism) have been carried out of binding energies and relaxation energies for an extensive series of oxygen‐containing organic systems encompassing most of the common functionalities. The molecules for which experimental data are available for comparison d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance of low-spin cobalt(II) complexes: effect of axial ligation upon the ground stateAbbas Pezeshk, Frederick T. Greenaway, and Gershon VincowCite this: Inorg. Chem. 1978, 17, 12, 3421–3425Publication Date (Print):December 1, 1978Publication Histor…
The corrosion rates of low alloy steel and carbon steel in 0.1 N NaCl were accelerated by factors of 4 to 6 when an alternating current density of 30 mA/cm2 (60 cps) was applied in dilute salt solutions purged with nitrogen. Tests with low frequency alternating anodic and cathodic current showed that both steels polar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of binuclear .mu.-peroxo and .mu.-superoxo cobalt(III) amine complexes from Raman spectroscopyColin G. Barraclough, Geoffrey A. Lawrance, and Peter A. LayCite this: Inorg. Chem. 1978, 17, 12, 3317–3322Publication Date (Print):December 1, 1978Publication Hist…
Abstract α,β,γ,δ-Tetraphenylporphinatoaluminium methoxide reacts reversibly with carbon dioxide in the presence of 1-methylimidazole, and this carbon dioxide is activated to react with propylene oxide to produce propylene carbonate under atmospheric pressure and at room temperature.
Chromium chrysoberyl undergoes a phase transformation from a paramagnetic state to a complex antiferromagnetic state at 28 K. The spiral spin structure of the antiferromagnetic state violates all the crystallographic symmetry elements, making Cr2BeO4 potentially ferroelectric. Chynoweth experiments conducted at low te…
Abstract Ten chitosan products were manufactured from dry shrimp hulls under differing process conditions and compared to a commercially available product. Manufacturing variables tested were: alkali versus enzymatic deproteination; acid demineralization versus no treatment; air versus nitrogen atmosphere; 5 min vs. 1…
The high yield of secondary electron emission from insulators due to electron bombardment may be the result of an increase of the depth of escape. The free-electron scattering theory is applied to the high energy of the primary beam, but it cannot be applied to the low energy of the secondary escaping beam because of…
Results are presented which show that the flatband potential ( V fb ) of a semiconducting cadmium sulfide ( CdS ) photoanode can be predicted from atomic electronegativity of its constituent atoms. This procedure, previously applied only to metal oxides, now appears generally applicable to any semiconductor‐electrolyt…
Expressions are derived for the effect of penny-shaped cracks of various orientations on the thermal conductivity of solid materials.
Single-crystal neutron-diffraction data with full-matrix least-squares refinements have yielded precise locations for all atoms (for the H atoms in particular), in both compounds. Hydrogen bonding with H atom sites disordered with equal occupancy, as previously postulated to be the source of zero-point entropy in the…
Solvent makes a significant contribution to the diffracted intensity of crystals and fibres of large biological molecules. Allowance for this contribution must be made in the refinement of trial structures and an improved method is described for the calculation of solvent scattering.
Ein allgemeines Strukturprinzip für organische Verbindungen, die zur zweistufigen Elektronenübertragung befähigt sind, geht aus der folgenden Reaktionssequenz hervor: Dabei können ein oder beide X durch Y⊖ ersetzt sein. In diesen Systemen besitzt der radikalische Partner oft sehr große thermodynamische Stabilität. Wah…
Abstract A new, fast, and simple method based on size exclusion chromatography permits determination of the volumes of open and closed pores of rigid solids such as silica or porous glasses, together with the specific surface and the pore‐size distribution for pore diameters ranging from 10 to 4000Å. The results are i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure and redox properties of the clusters [Ru3O(CH3CO2)6L3]n+John A. Baumann, Dennis J. Salmon, Stephen T. Wilson, Thomas J. Meyer, and William E. HatfieldCite this: Inorg. Chem. 1978, 17, 12, 3342–3350Publication Date (Print):December 1, 1978Publication Hist…
Some dielectric materials with large densities of low-mobility charge carriers show an anomalous low-frequency dispersion of the real and imaginary components of the complex dielectric permittivity, both varying as ω n−1 , with n close to or equal to zero. This behaviour is likely to be found in any dielectric materia…