Materials Literature
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It is pointed out that a simple, localized-electron antiferromagnet having one electron per localized orbital interacting via 180\ifmmode^\circ\else\textdegree\fi{} superexchange with similar orbitals on $z$ near-neighbor cations via an overlap integral $\ensuremath{\Delta}$ has a N\'eel temperature $k{T}_{n}\ensurema…
Two series of manganate phases have been prepared and their magnetic properties measured. The first series consists, in addition to CaMn${\mathrm{O}}_{3}$, of three phases having layered structures. In these, tetravalent magnanese ions are contained in single or multiple perovskite layers which are separated from each…
Abstract The critical sizes of particles of magnetic material with high uniaxial anisotropy are calculated by equating the energies in the single and multi-domain states. Exact calculations are presented of the variation of critical size with shape for a rectangular particle, and the variation of critical size in an…
Abstract Cotton print cloth was treated with a solution of formaldehyde in concentrated orthophosphoric acid (a strong cellulose swelling agent). The treatment produces a crosslinked cotton with extremely high wet wrinkle recovery and moisture absorptivity, and very low dry wrinkle recovery. The variations in physical…
Abstract An aspen 4‐ O ‐methylglucuronoxylan was grafted with poly(sodium acrylate) (PSA) in 3.4 N NaOH at 25–30°C. with the use of a persulfate–thiosulfate redox initiator system. The formation of a true graft copolymer was indicated by fractional precipitation and light‐scattering studies, physical mixtures of the t…
Article The crystal structure and refinement of ferrimagnetic barium ferrite, BaFe12O19 was published on December 1, 1967 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 125, issue 1-6).
Abstract Der Dampfdruck über flüssigem SbCl 3 wurde zwischen 90 und 190°C, der über flüssigem SbCl 5 zwischen 50 und 120°C im Membrannullmanometer gemessen. Die Auswertung liefert die Verdampfungsenthalpien und Verdampfungsentropien am Siedepunkt: Die aus den Geradenneigungen berechneten Siedepunkte betragen \document…
The magnetic properties of three single crystals of dysprosium have been investigated along the principal directions of the hexagonal close-packed structure, over the temperature range 4 to 300 °K and in applied fields up to 18 kOe. The measurements along the a and b directions agree in general with the previous work.…
Craters produced by projectile impact in granular materials were studied for a wide range of energies and projectile types. Crater sizes were shown to depend on projectile size and shape and on the particle size of the target material. The volume of the impact crater was related to the kinetic energy of the projectile…
Major preceding studies of the distribution of substituents in cellulose have been reviewed. Over-all results indicate that the highest degree of reaction occurs at the hydroxyl group on C-2 in the case of the irreversible Williamson syntheses involving reagents of small molecular size. Pronounced preferential reactio…
Abstract Durch Festkörperreaktionen gelang die Darstellung von 8 Verbindungen des Typs M (X VI O 4 ) 3 F 2 (M II = Sr, Pb; X VI = S, Cr; X IV = Si, Ge) mit Apatitstruktur. Die Gitterdimensionen der Verbindungen werden mitgeteilt. Zwischen Sr 10 (PO 4 ) 6 F 2 und Sr 10 (SO 4 ) 3 (SiO 4 ) 3 F 2 besteht eine vollständige…
Some recent measurements of the inelastic scattering of kilovolt electrons by solids and liquids are described. The determination of energy losses and cross sections is discussed as well as factors influencing the accuracy of measurement. The degree of correlation between optical and electron energy loss experiments a…
Summary Radiometric analysis indicates that a granular variety of glauconite, widespread on the Chatham Rise, is derived from late Tertiary sediments. Other forms of glauconite, associated with pumice, phosphorite nodules, and glacially‐transported erratic blocks, are of Quaternary age. These are quantitatively unimpo…
Abstract Cellulose esters which have a high degree of esterification are readily crystallizable by simple heat treatments. Such esters include cellulose triacetate, cellulose tripropionate, and mixed cellulose triesters. X‐ray diffraction analysis shows distinct crystal patterns for these crystalline cellulose esters,…
The gold wire-aluminum thin-film joint is treated as a diffusion couple at low concentration, but above dilute levels. Electrical resistance of the joint is directly related to the solute concentration and, therefore, is a measure of the thermal annealing process. Annealing temperatures are related through the diffusi…
The Raman spectrum of S2Cl2 has been excited with a 6-mW He–Ne laser, 6328 Å, and new depolarization ratios of the Raman bands have been obtained. The Raman band at 449 cm−1 previously reported by earlier workers is shown to be two bands corresponding to two fundamentals, one of Type A and another Type of B, at 446 cm…
Summary Some structural analogies found in tsumebite, vauquelinite, fornacite, and brackebuschite make it possible to place these secondary lead minerals in the same series with general formula Pb 2 Me II ( Z )( XO 4 )( YO 4 ), where M e II is a bivalent cation as Cu 2+ or Mn 2+ , Z is the hydroxyl group or the water…
A qualitative description is presented for the behaviour of the hysteresis loss and the dielectric constant in ceramic barium titanate in terms of the properties of single-crystal barium titanate. When the effects of imperfections and interaction between crystallites are introduced, this description explains the simil…
The object of this theoretical investigation is to determine the importance of the nonequilibrium region, which exists at the bubble wall, on the growth of a vapor bubble. All previous investigators concerned with bubble growth have completely neglected this nonequilibrium effect. In another paper [1] Bornhorst and Ha…
Abstract Quantitative gas chromatographic analyses supplemented by X-ray diffraction studies of the adsorption of ethanol and acetone (as model polar organic compounds) on homoionic montmorillonite revealed marked variation in the number of molecules associated with each exchange cation. The results show increasing as…