Materials Literature
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At room temperature the background of X-ray single-crystal photographs exhibits diffuse streaks along the line Δ from Γ to X and less sharp diffuse domains in the directions Σ. The streaks are explained by a soft rotary phonon A2(Δ) corresponding to an in-phase rotation of the octahedra in a plane. The displacements o…
Infrared and 13C and 1H n.m.r. data for the complexes [M2(cp)2(CO)3(CNR)][cp =η-C5H5, M = Fe, R = Me, C2H5, CH(CH3)2, C(CH3)3, or Ph; M = Ru, R = Me, C2H5, CH(CH3)2, or C(CH3)3] show that, in solution, mixtures of isomers containing bridging and terminal isonitrile ligands exist; the n.m.r. results may be interpreted…
In this study the viscosity Bη coefficient and the ionic partial molar volume of the borate ion in aqueous solutions have been determined at 25 and 45°C. These properties, together with data reported for the borate mobility, the borate–cation interactions and the formation entropy of the borate ion in aqueous solution…
Through studies of the photodegradation of commercial polymers and their model compounds, the roles of ketone carbonyl and hydroperoxide functional groups in the overall photodegradation mechanism have been elucidated. Besides undergoing photochemical reaction themselves, polymeric ketones are capable of sensitizing t…
The phases present in an as-cast commercial nickel-aluminium bronze of nominal composition Cu-10Al-5Ni-5Fe have been characterized by optical and electronoptical techniques. Phase distributions andprecipitate morphologies have been studied by optical microscopy, scanning electron microscopy, and transmission electron…
A neutron diffraction study of cubic CsPbX3 (X = Cl or Br) has been carried out over the temperature ranges 325-623 K for CsPbCl3 and 408-673 K for CsPbBr3. The temperature factors for the perovskite structure were derived following the method of Matsubara [Prog. Theor. Phys. (1975), 53, 1210-1211] which includes the…
Abstract The electrical conductivity and the thermoelectric power of boron carbide are investigated in the temperature range from 80 to 700 K on samples of compositions between B 12.94 C 2.06 and B 10.59 C 4.41 . While the extrinsic thermal activation of free carriers dominates the electronic transport at high tempera…
The heat capacity of butyloxybenzylidene octylaniline has been measured from 0° to 95 °C. Significant pretransitional effects are observed near both the first-order transition from the normal rigid crystal to the B phase plastic crystal and the first-order melting transition from the B phase to the smectic-A liquid cr…
Magnetic susceptibility measurements on powdered samples of bis(benzylammonium) tetrachlorocuprate (II), bis(phenethylammonium) tetrachlorocuprate(II), bis(3-phenyl-1-propylammonium) tetrachlorocuprate(II), and bis(benzylammonium) tetrabromocuprate(II) have shown that these four substances order ferromagnetically with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-frequency vibrational spectra of bromo- and iodobismuthates and the observation of a trans effectJaan Laane and Paul W. JagodzinskiCite this: Inorg. Chem. 1980, 19, 1, 44–49Publication Date (Print):January 1, 1980Publication History Published online1 May 2002Published in…
La synthèse de smectites magnésiennes a été réalisée à basse température (5 à 90 °C) à partir d'un coprécipité silicomagnésien obtenu par la réaction suivante : 4 SiO₂Na₂O + 3MgCl₂ + 2 HCl → Si₄Mg₃O₁₁(nH₂O) + H₂O + 8 NaCl. Le précipité solide est ensuite mis à évoluer en suspension aqueuse en présence ou non de LiF (o…
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The hydrolysis of p-nitrophenyl acetate catalyzed by β-cyclodextrin can be photoregulated by means of trans–cis photoisomerization of potassium p-(phenylazo)benzoate.
An analysis of the initial load–extension behaviour of plain-woven fabrics is presented, Castigliano's theorem being used as the principal method of attack. Yarn compression and extension are taken into account in addition to yarn bending rigidity. The theory is compared with some experimental data.
Cultures of Myxococcus xanthus develop multicellular fruiting bodies when starved for carbon and nitrogen sources on an agar surface. Under these conditions of severe starvation, cultures rapidly accumulated a compound identified as guanosine tetraphosphate by chromatographic migration of the compound and of its major…
Extremely efficient decarbonylation of aromatic and aliphatic aldehydes has been accomplished catalytically under ambient conditions using solutions of bis(triphenylphosphine)(tetraphenylporphyrinato)-ruthenium(II).
Configurations without strain (as opposed to curvature) in a mesomorphic phase made of long thin rods (like hexagonal liquid crystals) are characterized by local frames of reference undistorted with respect to the ground state and by absence of splay deformation (div t = 0). These constraints lead to an important clas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative determination of surface composition of sulfur bearing anion mixtures by Auger electron spectroscopyN. H. Turner, J. S. Murday, and D. E. RamakerCite this: Anal. Chem. 1980, 52, 1, 84–92Publication Date (Print):January 1, 1980Publication History Published online…
Introduction. The purpose of this paper is to survey recent results related to the second part of Hubert's eighteenth problem (see Hilbert [1900]). This problem, which is concerned with tilings of Euclidean space by congruent polyhedra, will be stated below after the necessary terminology has been introduced. Although…
Abstict -The interacticn between synthetic polyners and the physical environnnnt , especially in tenis of the effects of oxygen and radiant ener , has been extensily studied and reported and thictly useful results haw been obtained by the use of experianntal techniquss of a kind vexy familiar to physical chemists. The…