Materials Literature
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By use of Fourier-integral representations and lattice orthogonality relations, Madelung sums are cast in a form which explicitly separates contributions due to crystal symmetry from those due to the detailed arrangement of neighboring ions. The usefulness and mathematical soundness of the method are demonstrated by v…
Summary Pelitic rocks were followed from unmetamorphosed clays and marls of Upper Triassic and Lower Liassic to anchimetamorphosed phyllites of the Alpine border region in Switzerland. Phengite and Al‐rich chlorite formed from mixed‐layer illite/montmorillonite; pyrophyllite from kaolinite. For the formation of parago…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of enzymic formation of homogentisate from p-hydroxyphenylpyruvateBengt Lindblad, Goran Lindstedt, and Sven LindstedtCite this: J. Am. Chem. Soc. 1970, 92, 25, 7446–7449Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published…
Abstract The crystallization of elemental selenium has been studied in light of present concepts of crystallization in organic polymers. Bulk‐crystallization kinetic data as measured by a dynamic density technique and spherulite growth‐rate data as measured by optical microscopy are presented for the temperature range…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of rare earth antimonate pyrochlores and cathodoluminescence of europium(3+) in 3Gd2O3.Sb2O5D. K. NathCite this: Inorg. Chem. 1970, 9, 12, 2714–2718Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December 1…
Diffusion and stress profiles were determined in an Na‐for‐Li exchanged Li 2 O‐Al 2 O 3 ‐SiO 2 glass as a function of the time of reheating in air. Comparison of the two sets of data by a thermal‐stress analogy gave a fair correlation, although the depth of the compressive layer was overestimated by about 16%. Stress…
Article Ein neues Verfahren zur Bestimmung der Oberflächenform und der inneren Struktur von gelösten globulären Proteinen aus Röntgenkleinwinkelmessungen was published on December 1, 1970 in the journal Zeitschrift für Physikalische Chemie (volume 72, issue 4_6).
Conventional thermogravimetry, differential thermal analysis, and evolved gas analysis were used to study the thermal decomposition of reagent‐grade FeSO 4 ·7H 2 O and of freeze‐dried FeSO 4 ·H 2 O in oxidizing and inert atmospheres. The mechanism depends on the atmosphere but is the same for the freeze‐dried and conv…
Mössbauer spectra at 4.2°K were taken with 197Au in several aurous and auric compounds. For each oxidation state a linear correlation was observed between the isomer shift (IS) and the quadrupole splitting (QS). Both the IS and QS varied over wide ranges in both auric and aurous compounds. Neither IS nor QS alone coul…
Abstract The intercalation of several highly polar organic compounds into kaolinite and the formation of interlamellar complexes has been examined by X-ray diffraction. Some compounds intercalate directly into kaolinite, while others can only be intercalated by the displacement of a previously intercalated compound. T…
Abstract When kaolinite undergoes percussive grinding, pronounced changes take place in its i.r. absorption spectrum even in the earliest stages of the grinding when the lattice is not yet destroyed. In this report, attention is directed to the change in the stretching bands of the hydroxyl ions. A remarkably rapid ef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum efficiencies of transition-metal complexes. I. d-d LuminescenceGlenn A. Crosby and James N. DemasCite this: J. Am. Chem. Soc. 1970, 92, 25, 7262–7270Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December 19…
The thermal expansion behavior of the two duplex systems, lead-fused silica and aluminum-silicon, has been investigated experimentally above and below room temperature. The microstructure in the first case consisted of fused silica particles in a lead matrix, while silicon constituted the dispersed phase in the second…
Stress corrosion cracking in AISI 4340 steel was studied utilizing an Sb/Sb2O3 Ag/AgCl probe which simultaneously measures the crack tip electropotential and the electrolyte pH of the region. Additional confirmatory measurements were made with a glass electrode and Ag/AgCl reference electrode. Specimens heat treated t…
At rest between parallel plates, cholesteric liquid crystals commonly exhibit a characteristic twisted orientation pattern, the axis of twist being perpendicular to the plates. Also, this orientation pattern appears possible in nematic liquid crystals, since it is consistent with continuum theory(1) for both types of…
Liquid crystals are considered as gases of long barlike molecules. Variables describing the position and orientation of individual molecules are introduced. These are used to arrive at a microscopic definition of the order in liquid crystals in terms of a symmetric traceless tensor. The Frank and Leslie-Ericksen direc…
A fluid of hard rods is considered as a model for nematic liquid crystals. A direct application of the scaled particle approach results in an inconsistent thermodynamics. A simplified version which is consistent gives an integral equation for the orientational distribution which has the same form as that used by Onsag…
Molecular dynamics experiments made on a system of 864 particles interacting through a Lennard-Jones potential for various high-density states are used to study the self-correlation in classical fluids. The self-diffusion constant is computed and interpreted in terms of a hardsphere model. The memory-function formalis…
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