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We present dc measurements of the reversible pyroelectric effect in the temperature interval 170–350 °K and of the inverse piezoelectric effect at 0.3 °K for films of commercial polyvinylidene fluoride which were polarized in a strong dc electric field at elevated temperatures. The pyroelectric coefficient dP/dT incre…
The magnetic structure of high-purity single crystals of erbium has been studied by neutron-diffraction techniques. Although the general characteristics of the magnetic structure of erbium have been found to be in agreement with earlier measurements, several interesting new features have been observed. At 84.4 \ifmmod…
The main objective of this work is the study of corrosion behavior under heat transfer conditions, i.e., in the presence of temperature gradients. Quantitative assessment of this factor necessitated performing complementary experiments to investigate the kinetics of the corrosion process and develop a mathematical rat…
Abstract Using Kubo's formula the optical intraband absorption is studied in two models of disordered systems. The model A is characterized by some few types of atoms and by strong electron‐phonon interaction, the model B by a continuous distribution of atomic levels and by an arbitrary strength of the electron‐phonon…
Summary The phylogeny of eucaryotic algae can be best illustrated by establishing lines of algal evolution leading from simple unicells to an elaborated tissue thallus. These evolutionary lines of algal morphological progress represent the Classes. The single grades of algal advance in a class represent a lower taxono…
The new compounds CaCuSb(Bi) and SrCuSb(Bi) were prepared and their structures determined. They crystallize in the „filled“ NiAs-(Ni,In)-structure.
Abstract Local vibrational modes of boron impurities have been detected in single crystals of Y 3 Fe 5 O 12 , Gd 3 Fe 5 O 12 , Y 3 Ga 5 O 12 , and Gd 3 Ga 5 O 12 , which were grown from a melt containing B 2 O 3 flux. The B 3+ ion is incorporated on a heavily distorted defect site, in threefold oxygen coordination. Fr…
The previously reported synthesis of ferrous ferricyanide involved pyrolysis of Prussian Blue which contained both the soluble KFeFe(CN)6 and the insoluble Fe4 [Fe(CN)6]3 forms. The soluble and insoluble Prussian Blues, and the ferrous ferricyanide compounds which derive from this vacuum pyrolysis at 300–500°C, have b…
Measurement of the fibre-packing density in the cross-section of a range of wool worsted yarns indicates that these are slightly hollow at the core, with the maximum packing density occurring about one-quarter of the yarn radius from the yarn axis. A comparison of these results with those obtained on cotton-viscose ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMass spectra and structural factors in the air stability of carboxylate complexes of Mo2+4 dimolybdenum(4+) ionE. Hochberg, P. Walks, and E. H. AbbottCite this: Inorg. Chem. 1974, 13, 8, 1824–1827Publication Date (Print):August 1, 1974Publication History Published online1 Ma…
Lithium or sodium doped beryllium oxide, BeO(Li: 0.5 mol%) and BeO(Na: 0.5 mol%), were found to be efficient and reliable thermoluminescent phosphors. Glow curves of both BeO(Li) and BeO(Na) have simple peaks at 180°C. The thermoluminescent spectrum shows a broad band in the ultra-violet region peaking at 330 mmicro w…
Abstract The behavior of trapped radicals in polyethylene which is irradiated in air at room temperature, under grafting of methylmechacrylate or butadiene has been studied by electron spin resonance. Part of the alkyl radicals are converted to allyl radicals by reaction with double bonds and the others disappear by r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of low-spin cobalt porphyrins. V. Molecular stereochemistry of nitro-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinato(3,5-lutidine)cobalt(III)James A. Kaduk and W. Robert. ScheidtCite this: Inorg. Chem. 1974, 13, 8, 1875–1880Publication Date (Print):Augus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of tris(tropolonato)manganese(III), Mn(O2C7H5)3, a high-spin complex having structural features consistent with Jahn-Teller behavior for two distinct MnO6 centersA. Avdeef, J. A. Costamagna, and J. P. FacklerCite this: Inorg. Chem. 1974, 13, 8…
A series expansion for the dielectric constant of the Bernal-Fowler-Pauling model of ice relaxed to allow Bjerrum faults is developed using a renormalization technique which eliminates large numbers of subgraphs. In the no fault limit the dielectric constant has the form ε0 = ε∞ + (4πG/3)(N/V)(μ2/kT) where the Bethe t…
A simplified form of Slater's model for treating exchange effects in an itinerant antiferromagnet is applied to hexagonal NiS. In this calculation, which involves the augmented-plane-wave (APW) method, the antiferromagnetic superlattice is introduced by adding a constant $+{V}_{s}$ and $\ensuremath{-}{V}_{s}$ to the p…
Abstract CDP-diglyceride: l-serine phosphatidyltransferase (phosphatidylserine synthetase) of Escherichia coli is tightly associated with ribosomes in crude cell-free extracts. The synthetase has now been separated from ribosomes by extraction with solutions containing 5 m NaCl and has been purified 100-fold. The part…
The effect of straight‐chain alcohols having chain lengths of 6 to 12 carbon atoms on crack propagation in glasses was studied. The test was a modification of the double‐cantilever‐beam technique. Plots of crack velocity vs stress intensity factor, K , were trimodal, similar to those for glass tested in N 2 gas of var…
Abstract A study of the oxidation of poly(vinyl alcohol) (PVAL) by potassium persulfate (KPS) in aqueous solutions showed that the decomposition of KPS was greatly enhanced by the presence of PVAL, its hydroxyl groups being oxidized to ketones in a yield of about one mole of ketone from one mole of KPS. The decomposit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImproved synthesis of tetrathiafulvaleneL. Russell Melby, Harris D. Hartzler, and William A. SheppardCite this: J. Org. Chem. 1974, 39, 16, 2456–2458Publication Date (Print):August 1, 1974Publication History Published online1 May 2002Published inissue 1 August 1974https://pu…