Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe crystal and molecular structure of triclinic tetraphenylporphyrinStuart J. Silvers and Alexander. TulinskyCite this: J. Am. Chem. Soc. 1967, 89, 13, 3331–3337Publication Date (Print):June 1, 1967Publication History Published online1 May 2002Published inissue 1 June 1967h…
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The CO 2 Acceptor Gasification Process is discussed in light of the required properties of the CaO acceptor. Equilibrium data for reactions involving the CO 2 and sulfur acceptance and for sulfur rejection fit the process requirements. The kinetics of the reactions are also sufficiently rapid. Phase equilibrium data i…
The 0.1 M Na-pyrophosphate solution extracted some of the Fe-, Al-organic matter products in Podzol B and some Acid Brown Wooded B horizons, but it dissolved a low proportion of the free Fe in the B horizon of some Gleysolic soils. It did not dissolve the inorganic amorphous or crystalline Fe and Al substances tested.…
Abstract Three polyethyleneoxide samples of molecular weights ranging from 6,000 to 28,000 have been studied with low‐angle X‐ray diffraction and dilatometry techniques. The thickness of the lamellae, the number of folds of the polymer chains, and the degree of crystallinity have been determined as functions of the cr…
Abstract In addition to the six liquids for which the results of viscoelastic measurements are reported in part I, studies have also been made on a further eight liquids which differ widely in molecular composition, namely: squalane, tri(β-chloroethyl) phosphate, tri(o-tolyl) phosphate, tri(m -tolyl) phosphate, tris(2…
Size-effect oscillations in the Hall resistivity have been studied in a monocrystal of highly pure cadmium at liquid-helium temperatures. Samples ranging in thickness from 2.01 to 0.09 mm were prepared from a single monocrystal by successively reducing the thickness using spark planing followed by electropolishing. Th…
The effective elastic constants of CdS have been measured by the ultrasonic pulse-echo method as a function of hydrostatic pressure to 4 kbar. The logarithmic pressure derivatives determined were $\frac{d\mathrm{ln}{C}_{11}}{\mathrm{dP}}=3.56$, $\frac{d\mathrm{ln}{C}_{33}}{\mathrm{dP}}=3.44$, $\frac{d\mathrm{ln}{C}_{1…
A formula for the phonon-drag part ${S}_{g}$ of the thermoelectric power in metals is obtained by assuming that the electron scattering processes can be described by a relaxation time $\ensuremath{\tau}(\mathrm{k})$. The formula differs from the simplest variational expression only by having extra factors of $\ensurem…
The specific heat of a ``splat''-formed amorphous alloy of gold-silicon-germanium exhibits a very steep rise with increasing temperature near 295°K to a peak and then begins to fall before crystallization occurs. These last Cp values fall on a reasonable extrapolation of the high temperature Cp-T relation found for th…
A study of the 7Li nuclear magnetic resonance in a LiNbO3 single crystal is made and the electric field gradient at the lithium site is determined. Electric-field-gradient calculations indicate that the net charge on the niobium is +1.59 while that on the oxygens is −0.86. This shows that the niobate ion is predominat…
Paramagnetic DyMn2O5 crystallizes in the orthorhombic system with lattice constants a=7.2940±0.0008, b=8.5551±0.0008, and c=5.6875±0.0008 Å, in the space group Pbam(D2h9). There are four DyMn2O5 per unit cell. The crystal structure was solved by a combination of three-dimensional Patterson and Fourier series and refin…
The kinetics of solidification of 1,3,5-tri-α-naphthylbenzene have been studied from 25° above the glass temperature (69°C) almost to the crystal thermodynamic melting point (199°C). The crystal growth rate has been analyzed using current theories of crystallization and a mechanism for crystal growth has been proposed…
The first-order Raman spectra of CaW${\mathrm{O}}_{4}$, CaMo${\mathrm{O}}_{4}$, SrW${\mathrm{O}}_{4}$, and SrMo${\mathrm{O}}_{4}$ have been obtained. All theoretically predicted vibrations have been observed, and assignment has been given for the internal vibrations of the tungstate and molybdate ions as well as for t…