Materials Literature
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On the basis of the relation T(σ,H) derived within the framework of the Bean–Rodbell model a semiquantitative analysis of (B,T) magnetic phase diagrams in the hexagonal region of the MnFeP1−xAsx (0.15⩽x⩽0.66) series of compounds was carried out. It was found that the first order transition line in the (B,T) plane is t…
Siderite, calcite and goethite occur in a Low Moor Peat near Freising, southern Germany. Siderite is present mainly as microcrystalline ovoids which have a lamellar structure and are less than 5 μm long. Selected area electron diffraction and X‐ray diffraction data suggest a crystal size less than that of the ovoids,…
Two recently synthesized derivatives of porphycene, 2,7,12,17-tetramethyl-3,6-13,16-dibenzo[ cde, mno ]porphycene and 2,7,12,17-tetra- tert -butyl-3,6-13,16-dibenzo[ cde, mno ]porphycene, were studied by stationary and time-resolved spectroscopy and quantum chemical calculations. Both compounds were found to be nonlum…
To meet the demand for permanent magnet materials usable up to 450–500 °C, we investigated and reported that a SmTM magnet with a low temperature coefficient of coercivity and a moderately high coercivity has substantially lower irreversible losses at elevated temperatures than conventional Sm2TM17 magnets. We have co…
To obtain water-soluble oligodepsipeptide with pendant thiol groups, the alternating co-oligomer [oligo(Glc-alt-Cys)], consisting of glycolic acid (Glc) and L-cysteine (Cys) residues as α-hydroxy acid and α-amino acid residues, respectively, was prepared by means of ring-opening homo-oligomerization of cyclo[Glc-Cys(M…
New diphenylfluorene-based aromatic polyazomethines were synthesized via polycondensation of aromatic diamines with aromatic dialdehydes. The highest inherent viscosity of polyazomethines was obtained for solution polycondensation in m-cresol at room temperature under reduced pressure. The aromatic polyazomethines hav…
A series of n-type ZnO alloys doped with Ga and ZnS were prepared by mechanical alloying. Densities of 95% to 98% of theoretical density were achieved by hot pressing the milled powders at 1000 and 1200 °C, respectively. The electrical resistivity and Seebeck coefficient of alloys containing 0.25–3.0 at. % Ga were cha…
Boralsilite, the first natural anhydrous Al-B-silicate, is a high-temperature phase in pegmatites cutting granulite-facies metapelitic rocks at Larsemami Hills, Prydz Bay, east Antarctica (type locality) and Almgjotheii in the contact aureole of the Rogaland Intrusive Complex, southwestern Norway. Stable assemblages…
Micromagnetic finite element calculations clearly show that the magnetizability of nanocomposite Nd2Fe14B magnets improves with increasing α-Fe content. The magnetization curves show a steep increase at the domain propagation field in dc demagnetized samples. Thermally demagnetized states store a higher amount of exch…
By means of photoinitiated SH-En-polyaddition of 2-ethylidene-6-hepten-5-olide (δ-lactone) and 2,2'-(ethylenedioxy)diethanethiol or 1,3-bis(3-mercaptopropyl)-1,1,3,3-tetramethyldisiloxane, it was possible for the first time to form a high-molecular linear polymer with an intact lactone structure. Under these condition…
Abstract Nearly pure sepiolite clay crops out in a playa-like depression near El Bur, Central Plateau region of Somalia. The deposit is associated with the Lower to Mid-Eocene Taleh Formation that includes, besides limestone, dolomite and gypsiferous marls, extensive anhydrite and various evaporites, primarily gypsum.…
: We have used the technique of in situ electron microscopy to study the oxidation and reduction of the palladium (Pd) catalysts. In this study, we have subjected a Pd catalyst to oxidation and reduction cycles and studied the changes in particle structure and morphology with in situ electron diffraction and imaging.…
Abstract A physically based, isostructural, constitutive model is described for simulating the onset of nonlinear viscoelasticity in multiaxial creep of glassy polymers, as needed in stress analyses of load‐bearing components. In the linear viscoelastic limit, shear response reduces to that of a generalized Maxwell mo…
In this paper, the mechanical and rheological properties, and the microstructure of the starch-glycerine blend prepared by a single-screw-extruder have been studied. Considering the rheology of the blend under different temperatures, we calculated the activation energy of the fluid of the blend to be 122.5 KJ/mol. Thr…
The crystal structure of a synthetic NaAlSiO4 modification has been solved and refined to an R index of 0.020 for 2745 independent reflections. The compound is hexagonal with space group symmetry P6 1 , a = 9.995(2) Å and c = 24.797(4) Å. The crystal showed twinning by merohedry according to m 210 , which was accounte…
Abstract Halloysite and kaolinite coexist in anorthosite weathering profiles in the Sancheong district, Korea. X-ray diffraction (XRD) analysis on a transect of partially weathered anorthosites reveals an increasing amount of kaolinite development with weathering age. Microtextures were examined by scanning electron m…
A numerical model was developed to simulate and study microwave-induced transport in ionic solids. The model is based on continuum equations, is very general, and could be applied to many materials. The assumptions, boundary conditions, initial conditions, and numerical techniques used in the model are described. Resu…
Abstract The Danian of the Provence basin (SE France) is characterized by a strong subatmospheric alteration processes throughout the basin. A wide range of facies, depositional and weathering, were recognized in an interval of 5 Myr and include floodplain fine-grained alluvium, palustrine limestones, playa dolostones…
We report an unprecedentedly large spontaneous Hall effect in ferromagnetic ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{CoO}}_{3}$ $(0.2<~x<~0.5)$ epitaxial films. The effect exceeds existing theoretical predictions for the value of the spontaneous Hall resistivity ${\ensuremath{\rho}}_{\mathrm{xy…
A series of epoxy-based second-order nonlinear optical (NLO) polymers containing heteroaromatic chromophores have been designed. Precursor polymers were prepared from the polymerization between the diglycidyl ether of Bisphenol A and aniline or 4-(2-thienyl)aniline. The precursor polymers were postfunctionalized by an…