Materials Literature
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Mössbauer data on the magnetic properties of Fe5SiB2 are presented and compared with measurements on Fe5PB2, Mn5PB2 and Mn5SiB2. The introduction of boron on the silicon position leads to an increase in the magnetic hyperfine field at neighbouring iron nuclei.
Measurements are reported on the effect of specimen size and filler content on the electrical-impulse strength of epoxy polymer. For unfilled polymer, the strength was found to decrease more rapidly with increasing thickness than with increasing area. But the incorporation of as little as 1 percent by volume of filler…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of nitrogen tribromide decomposition in aqueous solutionGuy W. Inman, Thomas F. LaPointe, and J. Donald. JohnsonCite this: Inorg. Chem. 1976, 15, 12, 3037–3042Publication Date (Print):December 1, 1976Publication History Published online1 May 2002Published inissue 1…
Magnetic interactions, categorised into ligand based, metal based and neutron diffraction, are reviewed with regard to the information they give on covalency. The ligand hyperfine interaction, the metal hyperfine field measured by the Mössbauer effect and neutron diffraction measurements are mentioned in some detail,…
A potters clay from the Gorgan plain, in N. E. Iran, has been fired successively at temperatures up to the melting point 1 200 °C in an atmosphere of air or 5 % CO in moist CO2. Mössbauer spectra at 296 K and 4.2 K allow the determination of the relative amounts of iron in well-crystallised haematite or magnetite, of…
Summary Chemical and mineralogical properties of brown podzolic soils, brown earths, a podzol, and an Andept have been studied with particular reference to the kinds and distribution of amorphous materials. In addition to pyrophosphate extractable (Fe + Al)/per cent clay, brown podzolic soils can be distinguished from…
Abstract Methanol was decomposed into hydrogen and carbon dioxide in the presence of water at atmospheric pressure over copper-containing mixed oxides, indicating that the reforming reaction CH3OH + H2O = CO2+ 3H2 proceeded to an appreciable extent. The mixed oxides were active and selective for the reforming reaction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman studies of macrocyclic complexes. 1. Structural and electronic effects in synthetic metal(II) porphyrin analogsWilliam H. Woodruff, Richard W. Pastor, and James C. DabrowiakCite this: J. Am. Chem. Soc. 1976, 98, 25, 7999–8006Publication Date (Print):December…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBending of linear nitric oxide ligands in four-coordinate transition metal complexes. Crystal and molecular structure of dinitrosyldithioacetylacetonatocobalt(-I), Co(NO)2(SacSac)R. L. Martin and D. TaylorCite this: Inorg. Chem. 1976, 15, 12, 2970–2976Publication Date (Print…
Abstract Infrared spectra of nontronite reveal shifts to lower wave, number in peaks located at 3570, 1030, and 821 cm -1 , which are assigned to vibrational modes for O-H stretching, Si-O b (basal oxygens) tetrahedral vibrations, and FeO-H deformation, respectively, as the Fe 2+ content increases upon reduction. A pl…
The influence of anions on the initiation of pitting and the kinetics of pit growth on aluminum alloy Type 7075 has been investigated. The order of reaction ( i.e. , the number of anions per Al surface reaction site) and the energy of activation for pitting initiation have been measured in F − , Cl − , Br − , and I −…
Electron microscope studies of relatively large planar defects having linear dimensions up to some 5 μm, which lie in {100} planes in diamond, and which emit a greenish-yellow cathodoluminescence, are reported. Evidence is presented that such ‘giant’ platelets are of the same species as, and merely much larger example…
An analysis of x-ray scattering from magnetically oriented liquid crystalline solutions of poly-γ-benzyl-L-glutamate (PBLG) in dioxane yields a value for the order parameter S?0.75. At the isotropic–liquid crystal phase transition, the critical order parameter Sc?0.5 appears to agree with predictions of mean-field the…
In contradistinction to all currently available water-soluble contrast media, metrizamide (Amipaque) is not a salt, but a substituted amide and therefore does not dissociate in solution. This unique property results in solutions of high iodine content yet with low osmolality. Metrizamide probably has a lower neurotoxi…
The metallurgical and electronic structure of TiFeH x alloys are probed by 57 Fe Mossbauer effect studies. The results are qualitatively consistent with and support Reilly and Wiswall's conclusions (1974) on the phase diagram. Volume effects and charge flow are both important in the isomer shift.
We study the properties of a Ginzburg-Landau-Wilson Hamiltonian in which an order parameter is associated with each wave vector which points from the origin to one of two rings in reciprocal space. The existence of the order parameter breaks the two-dimensional rotational symmetry about the axis of the rings. The Hami…
In this paper results are given of an electron optical investigation of the cross section of optical single films and multilayers obtained by fracture. Direct observation techniques with scanning microscopy and the surface replica technique with transmission microscopy were used. Scanning microscopy is simple in sampl…
The crystal structure and electronic charge distribution of pyrazine (1,4-diazabenzene) has been determined at 184 K by X-ray methods. The structural results of Wheatley [Acta Cryst. (1957), 10, 182-187] have been confirmed. A clear indication of bonding effects is obtained. Neither positional and thermal parameters n…
The problem of the first- or second-order nature of the nematic-smectic-$A$ phase change is explored. It is found that couplings between various order parameters, especially the first and second translational ones, are important. General Landau theory for coupled orientational and translational order parameters is dev…
The synthesis of a covalent dimer of chlorophyll a which possesses properties strikingly similar to those exhibited by P700 special pair chlorophyll in vivo is described. The covalent dimer is characterized by several spectroscopic techniques. Hydrogen bonding nucleophiles, such as water, primary alcohols, and primary…