Materials Literature
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In order to study nature of the electronic structures in manganites, the effective Hamiltonian is derived by taking the degeneracy of the ${\mathrm{e}}_{\mathrm{g}}$ orbitals and the strong electron correlation into account. The spin and orbital ordered phases in the insulating states are studied in the mean-field app…
Abstract Under laboratory conditions, there were detected burning products of pyrotechnic compositions based on red phosphorus with epoxy resin being especially trihydrogenphosphoric acid, tetrahydrogendiphosphoric acid and mixture of cyclo ‐triphosphoric acid, cyclo ‐tetraphosphoric acid and cyclo ‐hexaphosphoric aci…
The synthesis of phosphoryl-based dendrimers is described, using the reiteration of a two-steps process which gives alternatively aldehyde and P(O)Cl2 end groups. The synthesis has been carried out up to the third generation, to give a compound which bears 24 chlorine atoms on the surface. Preliminary experiments on t…
The crystal structures of three new cristobalite-related sodium magnesiosilicates [Na 2 MgSiO 4 , M r = 162.37, orthorhombic, Pna 2 1 , a = 10.835 (5), b = 5.279 (12), c = 7.067 (8) Å, D x = 2.668 g cm −3 , Z = 4, Cu K α, λ = 1.5418 Å, μ = 75.96 cm −l , F (000) = 319.87; Na 1.74 Mg 0.79 Al 0.15 Si 1.06 O 4 , M r = 157…
Stereoregular polymerization of p-methylethynylbenzene (MEB) was successfully performed using a [Rh(norbornadiene)CI]2 catalyst in alcohol and triethylamine. Polymers which have a cis-transoid structure were selectively formed in fairly high yields. The structure and properties of the resulting polymers were compared…
The inhibition mechanism of propargyl alcohol (CH≡CCH2OH [PA]) was investigated for iron (Fe) corrosion in 0.5 M hydrochloric acid (HCl) at elevated temperatures using surface-enhanced Raman scattering (SERS), x-ray photoelectron (XPS), and Fourier transform infrared (FTIR) spectroscopies. SERS spectra of PA adsorbed…
Mixed Ni−Cr−V, Mg−Cr−V, and Ni−Al−V oxides have been prepared by thermal decomposition of layered precursors with the hydrotalcite structure (brucite-like layers containing divalent and trivalent cations, and interlayer anions balancing the extra positive charge of the layers) at 300 or 500 °C. Surface acidity (Brönst…
A general model is presented which allows one to calculate the average number of neighbours in small clusters as a function of the cluster size. A formula is derived for spherical clusters and applied to small Cu clusters made by ion implantation in AIN. EXAFS was used to determine the atomic short range order and siz…
Abstract Multiple viscoelastic properties were determined for poly(methyl methacrylate) in the context of examining experimental limitations on deriving other properties from these measurements, specifically time dependent bulk modulus behavior. By means of master curves for uniaxial extension on plate and cylinder sp…
We propose a novel and poweful methodology for three-dimensional (3D) grain growth modelling in both the anisotropic and the locally inhomogeneous cases, thus significantly generalizing previous related two-dimensional work. The fundamental modelling structures for the polycrystals and their behaviour are dynamically…
Abstract— The Technical Committee “Ceramics” (TC 6) of the European Structural Integrity Society (ESIS) organized a round robin relating to the fracture toughness of ceramic materials at room temperature. Five materials were tested with five testing methods by eighteen laboratories. The five testing methods were: chev…
Abstract Mathematical models developed describe the unfolding of polymeric crystals in the presence of a solvent followed by their subsequent disentanglement. A thermodynamic model considering the free energy changes during crystal unfolding was proposed to obtain an expression for the unfolding rate. A simplified ver…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTProperties and Crystalline Structures of Syndiotactic Poly(propylene-co-1-butene)Naofumi Naga, Kooji Mizunuma, Hajime Sadatoshi, and Masahiro KakugoView Author Information Petrochemicals Research Laboratory, Sumitomo Chemical Co. Lt…
Abstract There has been much interest in the rare specimen of beidellite from the Black Jack Mine, Florida Mountain, Idaho. A variety of aluminous clays exists along veins such as the Black Jack vein, in rhyolite and latite flows, and in near-surface ash beds, often containing less than 1.0% MgO and 0.5% Na 2 0. Assoc…
The static and dynamic properties of three randomly branched systems under good solvent conditions have been investigated by light scattering. Despite large differences in the topology and chemical structure of these systems one common scaled particle scattering function ( P ( qR g )) is obtained for the probed q rang…
This paper describes the development of an automated sample translatory type apparatus capable of measuring the magnetocaloric effect of potential magnetic refrigerants over the temperature range 10 to 325 K in applied fields of up to 9 T. A Quantum Design® Physical Property Measurement System has been used as the hos…
Abstract The use of intrinsically conductive polymers in welding of plastics and composites offers the possibility of developing new welding methods. Intrinsically conductive polyaniline (PANI) composite gaskets were used to microwave weld high density polyethylene (HDPE) bars. Two composite gaskets were made from a m…
Abstract Deactivation of free radicals, hydroperoxides and harmful solar radiation are the principal mechanisms increasing stability of commodity and engineering polymers. The stabilization process is accompanied by transformations of individual additives. New compounds influence specifically the integral protecting m…
The flexoelectro-optic effect in short-pitch cholesterics [1] is analysed in terms of applied electric field strengths and material parameters such as the two flexoelectric coefficients es and eb and the three elastic constants. Starting from the free energy density of the uniformly lying-helix (ULH) configuration, in…
The electrical and superconducting properties of hexagonal alkali tungsten bronzes A x WO 3 (A = K, Rb, Cs) were examined by calculating the electronic band structure of a representative hexagonal tungsten bronze and analyzing reported crystal structures of A x WO 3 (A = K, Rb, Cs). These bronzes possess one-dimension…