Materials Literature
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A recent reanalysis of enthalpy data for UO2 using a local smoothing technique has revealed a weak sigmoidal structure in the data and a corresponding specific heat peak, indicating the existence of a Bredig transition occurring at ca. 2610 K (ca. 0.84Tm). The same smoother applied to ThO2, PuO2 and the mixed oxides (…
The cubic phase of the lyotropic system hexa-ethyleneglycol mono n-dodecyl ether (C12EO6 )/water is studied by small angle X-ray scattering, at the synchrotron radiation facility of LURE. The indexation of 15 Bragg reflections is strongly in favor of a body-centred cubic structure with space group Ia3d. The presence o…
Nous avons étudié les dislocations de plagioclases calciques (An 68-70) déformés dans des conditions métamorphiques de faciès amphibolite rétrograde. Quatre systèmes de glissement ont été identifiés : [001] (010), [100] (001), 1/2[1-11] (011), [101] (101). Le système [001] (010) domine la microstructure avec des boucl…
Protodolomite was synthesized from sea water containing dioxane by adding 0.4M Na2CO3 solution at 40°C. The presence of dioxane in moderate concentrations (3 to 8vol%) in a parent solution favors the formation of CaCO3(calcite)-MgCO3 solid solution. Optimal condition for protodolomite synthesis was established. The mi…
An orthopyroxene–sillimanite association occurs in Al–Mg rich granulites within Archaean aluminous metapelites at In Hibaou (NW Hoggar). Sapphirine is characteristically present in those rocks as a reaction product of a high pressure mineral association. Other reaction products include cordierite and a second generati…
Two conjugated homologues of thiophene–7,7,8,8-tetracyanoquinodimethane (TCNQ) have been prepared, which form highly conductive complexes with typical electron donors such as 2,2′,5,5′- tetrathiafulvalene (TTF) or 5,6,11,12-tetrathiatetracene (TTT); these complexes have extensive conjugation.
The photocatalytic dehydrogenation of liquid methanol, ethanol, propan-1-ol and propan-2-ol has been investigated using platinized anatase and 366 nm u.v. radiation over the range 278–303 K. Activities and activation energies for carbonyl-compound formation were effectively identical for the four alcohols on Pt(0.5)/T…
We reviewed clinical data and quantitative muscle biopsy data from infants with hypotonia and developmental delay who had relatively small type 1 muscle fibers (fiber size disproportion; FSD). Study material consisted of 49 thigh muscle specimens from 37 patients, 1 week to 11.5 years old, who had FSD diagnosed betwee…
High-field magnetisation measurements have been performed on single-crystalline samples of hexagonal Ho 2 Co 17 , Ho 2 Fe 17 and Ho 2 Co 14 Fe 3 in fields up to 40 T. In this field interval the magnetisation curves of Ho 2 Co 17 and Ho 2 Co 14 Fe 3 exhibit pronounced magnetic transitions in the hexagonal plane. The ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of chemical waves in the acidic bromate-malonic acid-tris(bipyridine)ruthenium(2+) system in comparison with the ferroin systemL. Kuhnert and H. J. KrugCite this: J. Phys. Chem. 1987, 91, 3, 730–733Publication Date (Print):January 1, 1987Publication History Publishe…
We present a Flory approximation for the conformation of semi-flexible linear and branched polymers in the extremely stiff limit. We show that the upper marginal dimension dc for the excluded volume effect is in general reduced in the stiff limit. In particular, for a linear chain in a good solvent we find dc = 2 in a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZero-field magnetic susceptibility study of the magnetic phase transition in the two-dimensional ionic ferromagnet bis(benzylammonium) tetrabromochromate(II), (C6H5CH2NH3)2CrBr4Carlo Bellitto, Pasquale Filaci, and Salvatore PatrizioCite this: Inorg. Chem. 1987, 26, 1, 191–19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and crystal structure of a new potassium borate, KB3O5.3H2OChristopher G. SalentineCite this: Inorg. Chem. 1987, 26, 1, 128–132Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue 1 January 1987h…
A study of the adsorption sites of thoria has been made using scanning transmission electronic microscopy (STEM) and Fourier-transform infrared spectroscopy (FTIR). The STEM study showed that the thoria surface was composed mainly of (110)(211) and (111) faces in about equal proportions. The infrared study of activate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTin sulfide, tellurium iodide ((Te2)2I2), and related compounds: symmetry-controlled deformations in solid-state materialsWolfgang Tremel and Roald HoffmannCite this: Inorg. Chem. 1987, 26, 1, 118–127Publication Date (Print):January 1, 1987Publication History Published onlin…
Non-uniform multiple slip near a grain boundary plane in face centered cubic bicrystals was examined analytically. Mathematical models for movement and interaction of dislocations were introduced to have a quantitative constitutive relation describing plastic deformation of face centered cubic crystals. Then, a new co…
When the CHCl3 extract obtained by partitioning the methanolic extract of Periploca sepium between H2O and CHCl3 was subjected to column chromatography on silica gel, the antitumor activity against Sarcoma 180 ascites in mice was concentrated in the fraction eluted with CHCl3-MeOH (10 : 1). From the antitumor fraction…
Stainless steels irradiated in EBR-II at temperatures in the range 380 to 500°C tend to exhibit saturation of mechanical properties at relatively low fluence levels. At fluences on the order of 13 to 15 × 1022 n/cm2 (E > 0.1 MeV), however, there is a rapid increase in hardness just after the onset of void swell…
A monochromatic X-ray irradiation system in the 0.08-0.4 nm wavelength range is described. This uses for the first time, synchrotron radiation at the Photon Factory as an X-ray source (2.5 GeV electron storage ring). It consists of a beam shutter, a Si crystal monochromator, ionization chambers for monitoring exposure…
A 1:1 Offner mirror system is modified to work as a grating spectrometer for the infrared by placing a grating on the secondary convex mirror of the system. Slight adjustment of the configuration combined with tilt of the secondary provide the necessary degrees of freedom to correct for astigmatism of the system. Addi…