Materials Literature
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Le phosphate de terbium a été étudié par diffraction des rayons X entre 2,6 K et 295 K, par mesure de sa suscéptibilité magnétique et par diffraction neutronique à 1,5 K, 4,2 K et 300 K. Les paramètres du réseau quadratique sont : [FORMULE]. Les paramètres des oxygènes sont : [FORMULE](description non centro-symétriqu…
The crystal structure of the zeolite stellerite has been studied by X-ray methods : space group Fmmm with a = 13.599, b = 18.222, c = 17.863 (Å). The framework of stellerite is topologically the same as stilbite ; its content of exchangeable cations allows the highest symmetry compatible with the framework. An explana…
Infra-red and Raman spectra of fluoranil are presented for the first time. A complete assignment of intramolecular fundamentals is achieved mainly on the basis of oriented crystal and vapour spectra in infra-red and of solutions in Raman spectroscopy. A simplified Valence Force Field is used to repodurce the in-plane…
The compound Pb 3 P 2 O 8 has a low temperature monoclinic phase with space group C2/c and a high temperature phase with space group [Formula: see text], both with two crystallographically inequivalent cationic sites. X-ray data taken at five temperatures have indicated that an F-centered monoclinic cell is developed…
The clustering of iron atoms in a copper matrix, as determined by earlier Mossbauer effect studies on alloys containing up to 3.1 at.% Fe, has been analysed in terms of the atomic short range order parameter alpha 1 . Good agreement is found between the experimental and calculated values of the clustering in groups of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Molecular Weight Anthracene Containing PolymerMilan ŠtolkaCite this: Macromolecules 1975, 8, 1, 8–9Publication Date (Print):January 1, 1975Publication History Published online1 May 2002Published inissue 1 January 1975https://pubs.acs.org/doi/10.1021/ma60043a002https://d…
In the absence of radiation the corrosion of quenched, cold worked and aged Zr-2.5 Wt% Nb in 280 C (536 F) pressurized water decreases with increasing aging time and temperature. Under neutron irradiation the corrosion in all aged conditions is much less, and no dependence on prior aging is discernible. The corrosion…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrimary isotope effects and general base catalysis in the hydrolysis of trans-dichloro(1,9-diamino-3,7-diazanonane)cobalt(III) cationsEtmina Ahmed, Marie L. Tucker, and M. L. TobeCite this: Inorg. Chem. 1975, 14, 1, 1–5Publication Date (Print):January 1, 1975Publication Hist…
The laticifers of Nelumbo nucifera Gaertn. (Nelumbonaceae) occur in vascular bundles and separately from these in the ground parenchyma. In common with laticifers in some other plants, they pass through a stage when they contain numerous small vacuoles, or vesicles, which later merge with the central vacuole. Osmiophi…
Abstract The r ‐values of styrene with p ‐divinylbenzene or m ‐divinylbenzene (DVB), respectively, as determined by several authors, deviate strongly from the ideal straight line in the binary polymerization diagram. In an attempt to convert the various r ‐values into coincident e ‐and q ‐values according to the equat…
The grain size effect on the apparent yield and flow stresses up to 20% strain has been investigated in polycrystalline copper and Cu–Al alloys of various grain sizes at 77 and 293 K.The apparent yield stress satisfies the Hall-Petch relation in all specimens. In copper, however, the flow stresses cannot be expressed…
O-Metallated yellow iridium(I) complexes, [[graphic omitted])}{PBut2(C6H4OX–2)}](I; X = H or Me), are described. 1H–, 31P–, And 1H–{31P}-INDOR studies show a complex behaviour with temperature, probably due in part to the complexity of the spin systems and to the presence of rotational isomers. A benzene solution of (…
e d 2 e x t e n s i v e l y .
Ce travail s’inscrit dans l’ensemble des études poursuivies au Laboratoire de Magnétisme du Centre National de la Recherche Scientifique à Grenoble sur l’anisotropie magnétocristalline. Cette étude constitue l’un des sujets fondamentaux du magnétisme et malgré les efforts déployés depuis de nombreuses années il n’exis…
The plasticity of β-brass single crystals, whose tensile axes lie relatively near the [001] direction, was investigated at temperatures ranging from 77°K to room temperature. It was found that the flow stress at 0.2% strain did not continuously increase with decreasing temperature but showed a peak value at about 195°…
It is possible to show quantitatively the macrosegregation in steel ingot if the flow velocity of bulk liquid during solidification can be obtained. It is found that the flow velocity of bulk liquid is determined by applying the hydrodynamical method known as Taylor's vortex flow to the solidification. Using this meth…
Results are presented from an extensive parametric study of x-ray photoemission. Calculations were performed of fore and back emission yield and energy-angular distribution, including the two-dimensional, asymmetric angular distribution for non-normal photon incidence, for a broad range of photon energies, angles of i…
A model must be judged on the basis of its ability to explain and predict experimental observations. We believe the model presented in this paper for the growth process and resultant morphology has been shown to be capable of explaining a wide variety of experimental observations by a number of different investigators…
It was only 2 years ago that “Collagen and Gelatin in the Solid State” was discussed by Yannas [1] in this Journal. That another review follows so soon is a reflection of the breadth of the subject and the accelerating interests in this field. Unlike other biological macromolecules which have specific genetic or metab…
Abstract Kristalle von BaTeO 3 wurden aus Schmelzen hergestellt. BaTeO 3 ist isotyp zu KClO 3 , kristallisiert monoklin, Raumgruppe P2 1 /m, Gitterkonstanten: a = 4,63 3 , b = 5,95 2 , c = 7,30 8 Å, β = 111,2°, Z = 2. Die Kristallstruktur wurde aus dreidimensionalen Intensitätsdaten durch eine Patterson‐Synthese besti…