A Reversible Redox Couple in Quinone‐Hydroquinone System in Nonaqueous Medium
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Luminescence of Sb3+ Centers in MgS Phosphors
Emission and excitation spectra of MgS: Sb 3+ phosphors are measured at various temperatures. In addition to the A , B and C excitation bands peculiar to Tl + -type ions, three bands corresponding to charge transfer transitions are observed. On each excitation band, distinct Jahn-Teller splitting is observed and the p…
Elastic Moduli of Gray and Nodular Cast Iron
The elastic moduli of both gray and nodular cast iron were measured by a pulse-echo elastic-wave technique at ambient and elevated temperatures up to 760°C. When compared at similar graphite contents, the elastic moduli of gray cast iron were much lower than those of nodular cast iron. These results are satisfactorily…
The limiting size of natural paracrystals
X-ray diffraction data for various materials reveal that naturally occurring microparacrystals cannot exceed a certain limiting size. The empirically obtained linear relationship between the square root of the limiting number of lattice planes within a paracrystal and the reciprocal value of the relative distance fluc…
Evidence of one-photon, two-electron excitation in the x-ray absorption spectra of germanium
Discontinuities corresponding to the simultaneous creation of two and possibly three electronic vacancies were observed in the absorption spectra of germanium. They occur at photon energies approximately equal to the energy required for the synchronous removal of two inner electrons. The magnitude of the observed disc…
Magnetic and thermal anomalies of Invar alloys
The anomalous volume contraction ωa(T) of Fe-Ni and Fe-Pt Invar alloys were analyzed in terms of the Grüneisen equation using the experimental data of thermal expansion coefficient. It was found that ωa(T) increases with increasing Fe composition or temperature and remains nonzero even above the Curie point ϑ f for bo…
Reactions of protoporphyrin with tetracyanoethylene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of protoporphyrin with tetracyanoethyleneRobert K. DiNello and David DolphinCite this: J. Org. Chem. 1980, 45, 25, 5196–5204Publication Date (Print):December 1, 1980Publication History Published online1 May 2002Published inissue 1 December 1980https://doi.org/10.10…
Rapidly Quenched Tungstate and Molybdate Composition Containing Lithium: Glass Formation and Ionic Conductivity
Extended glass‐forming regions were found by twin‐roller quenching in the systems of with and/or . The crystallization of the glasses was studied by DTA and x‐ray analysis; a new metastable crystalline phase was observed for . The glasses exhibited lithium ion conductivities in the 10 −5 –10 −6 (Ω‐cm) −1 range at room…
Temperature-dependent 5T2(Oh) .dblharw. 1A1(Oh) spin equilibrium in a six-coordinate cobalt(III) complex. Investigation by phosphorus-31 NMR in solution
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature-dependent 5T2(Oh) .dblharw. 1A1(Oh) spin equilibrium in a six-coordinate cobalt(III) complex. Investigation by phosphorus-31 NMR in solutionPhilipp Guetlich, Bruce R. McGarvey, and Wolfgang KlaeuiCite this: Inorg. Chem. 1980, 19, 12, 3704–3706Publication Date (Pr…
X-Ray Diffraction Study of a Concentrated Al(NO3 )3 Solution
Abstract The scattering of X-rays from a concentrated Al (NO 3 ) 3 aqueous solution has been measured and analyzed at 25 °C. Good agreement with experimental data is achieved through a model in which Al 3+ (H 2 O) 6 interacts with twelve water molecules through short and linear H-bonds. The water molecules which are t…
The forsterite-tephroite series: I. Crystal structure refinements
The crystal structures of the following metamorphic olivines, M;*[SiO4], in the forsteritetephroite (Fo-Te) series were refned in space group Pbnm:
Continuity in the monazite-huttonite series
Summary Electron diffraction and electron-microprobe investigations have revealed the presence of order in the monazite-huttonite series. Chemical analyses from the literature and electron-microprobe analyses in this study show that the monazite-huttonite series, RE PO 4 -ThSiO 4 , is only continuous if the contributi…
On the absence of the completely ordered phase in the Flory model of semi-flexible linear polymers
It is shown that in the Flory model (1942) of semi-flexible polymer chains, an assumption of random occupation of sites is not valid for estimating the excluded volume effects when the fraction of gauche bonds is small. Thus the model is never completely ordered except presumably at T=0, and the free energy is such th…
The molecular organization of collagen and its role in determining the biophysical properties of the connective tissues1
Crosslinking of collagen is a prerequisite for the collagen fibers to withstand the physical stresses to which they are exposed. Significant progress has been made in understanding the functional groups on the molecule which are involved in the forma
Tantalum imido complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTantalum imido complexesS. M. Rocklage and R. R. SchrockCite this: J. Am. Chem. Soc. 1980, 102, 26, 7808–7809Publication Date (Print):December 1, 1980Publication History Published online1 May 2002Published inissue 1 December 1980https://pubs.acs.org/doi/10.1021/ja00546a043ht…
Development of duplex deformation substructure during extrusion of a commercial Al-5Mg-0.8Mn alloy
The microstructural changes which occur during the extrusion of a commercial aluminium alloy (AA 5456) have been investigated at macroscopic, microscopic, and substructural magnifications. Light microscopy has established that the deformation zone is not fully established until a short time after the peak or breakthro…
Inelastic Interactions of Low-Energy Electrons with Organic Solids: Simple Formulae for Mean Free Paths and Stopping Powers
A theoretical description of the inelastic interactions of low-energy electrons (E≤10 keV) with solid organic insulators is presented. The response of the valence electrons to energy and momentum transfers is inferred from a model for the energy-loss function with parameters fixed by optical data. With this model ener…
Magnetism and superconductivity in a transition metal compound: Y4Co3
Measurements of AC susceptibility and electrical resistivity show the onset of magnetic order at about 5K and the onset of superconductivity at about 1.5K in samples of Y 4 Co 3 which are believed to be single phase. Interpretations are considered which take into account the characteristic structure of the compound an…
Direct Evidence for 1 nm Pores in “Dry”Thermal SiO2 from High Resolution Transmission Electron Microscopy
Thin films of thermally grown have been studied by high resolution bright‐field electron microscopy. Contrast phenomena observed in images from 9 nm thick "dry" films are consistent with the existence of 1 nm pores, typically 10 nm apart. Similar films grown in a wet oxidizing ambient do not display this contrast. A p…
Shear-flow-induced distortion of the pair-correlation function
Starting from the appropriate Smoluchowski equation, the pair-correlation function and the associated static structure factor are calculated for a colloidal suspension which undergoes a shear flow. Terms nonlinear in the shear rate are taken into account. The results obtained are in qualitative agreement with the elli…