Materials Literature
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Abstract Calcite phases with different amounts of ferrous iron (determined by microprobe analysis) are distinguishable by study of stained thin sections and stained acetate peels. We have defined four such phases, they are (a) non-ferroan calcite (0.0% FeO; red stain), (h) ferroan calcite I (0.5% to 1.5% FeO; red-purp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of low-spin iron porphyrins. I. Bis(imidazole).alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatoiron(III) chlorideD. M. Collins, R. Countryman, and J. L. HoardCite this: J. Am. Chem. Soc. 1972, 94, 6, 2066–2072Publication Date (Print):March 1, 1972Publicati…
An analysis of infrared conversion to visible and ultraviolet radiation by Yb3+–Er3+, Yb3+–Ho3+, and Yb3+–Tm3+ ions in crystals is presented. The expression for the visible power output in the presence of back transfer from the active ion to the energy-transferring ion (Yb3+) is given and the relationship between the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Weight Dependence of the Crystallization Kinetics of Linear Polyethylene. I. Experimental ResultsE. Ergoz, J. G. Fatou, and L. MandelkernCite this: Macromolecules 1972, 5, 2, 147–157Publication Date (Print):March 1, 1972Publication History Published online1 May 200…
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Partially stabilized zirconia (PSZ) ceramics in the system CaO‐ZrO 2 were characterized. The microstructure, as revealed by optical microscopy, consisted of grains of pure ZrO 2 distributed in a matrix of fully stabilized material. Electron microscopy showed that the matrix grains have a complex substructure of 1000‐Å…
Lithium ferrites are low-cost materials which are attractive for microwave device applications. For a number of years these materials have been prominent in the computer core industry because of excellent temperature performance and the squareness of their hysteresis loops. Previous attempts at exploiting lithium ferr…
Abstract An experimental study of thermal polymerization of styrene in the temperature range 100–200°C and conversion range 0–100% is reported. Conversions, molecular weight averages, and molecular weight distributions were measured. A kinetic model with third‐order initiation gives a satisfactory fit of conversion an…
We analyze a series of recent experiments in which it has been found that pressure induces changes in charge or spin of iron [i.e., Fe(III) reduces to Fe(II) and in Fe(II) there are spin changes involving either decrease or increase of multiplicity]. In addition to considering the volume difference of the two states a…
The infrared spectra of the fourteen complex ions [LnT4]- (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Th, Dy, Ho, Er, Tm, Yb, Lu; T = tropolonate anion) have been determined. One band within the range 480 to 510 cm-1 is found to be significantly metal-sensitive and is accordingly assigned to the metal-oxygen stretching frequenc…
The paper considers the properties of vector analogs of the Sobolev spaces, , which appear in the study of various models of continuous media. Korn's inequality, proved in the paper, makes it possible to reduce the problem of compactness of the imbedding operators in these spaces to the scalar case and, consequently,…
Abstract Photoelectron spectra in the region 6 to 21 eV have been measured for carbonyl halides (fluoride, chloride and bromide) and carbonyl cyanide. In a number of cases, vibrational structure coupled with the ionization process has been resolved and correlated with the known frequencies of the parent molecule. Ioni…