Materials Literature
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Feldspars with up to about 45% trivalent cations on M positions were synthesized by heating gels of composition Ca 8−2x Na x La x Al 16 Si 16 O 64 at 1300°C and 1 bar. In the range O 3 this substitution is accompanied by the substitution Ca 2+ + Al 3+ → Na + + Si 4+ . As x increases, the triclinic anorthite structure…
Eine Hohlkugel aus quadratischen VO 5 ‐Pyramiden und PhPO 3 ‐Tetraedern , in deren Innerem ein Chlorid‐Ion eingeschlossen ist, so läßt sich das Anion in 1 beschreiben (Strukturbild rechts). Auf den ersten Blick ähnelt dieses Anion mit seiner kugelförmigen Gestalt bekannten Polyoxoanionen, bei genauerer Betrachtung zei…
The crystal chemistry and thermal behaviour of synthetic hercynite (FeAl 2 O 4 ), a normal spinel, produced both hydrothermally and from sintering oxides at high temperatures, were studied by means of powder XRD and Mossbauer spectroscopy. The samples were annealed at different temperatures under controlled oxygen atm…
The study of the octahedral Fe-Mg substitution in smectites was conducted using clay synthesis at 200°C. Mossbauer data revealed that only ferric iron occurs in synthesized smectites. The studied series is then obviously heterovalent. All synthesized clays were tetrahedrally charged leading to structural formulae vary…
Intercalated layered materials comprising an organic dye and inorganic MPS(3) [where M is either the manganese ion (Mn(2+)) or the cadmium ion (Cd(2+))] phases have been prepared. The intercalation process induces a spontaneous poling, giving rise to an efficiency of 750 times that of urea in second-harmonic generatio…
Compressibility of Polymers Structural Aspects of Influence of High Pressure on Polyethylene Viscoelastic and Deformational Properties of Polymers Under High Pressure PVT Effects in Molecular Dynamics of Polymers Radiation Chemistry of Polymers Under High Pressure Polymerization Under Pressure Reactions of Solid Monom…
This book gives perspective of an exciting area of new and intelligent materials for electroactive sensor applications for microelectronics (and possibly in the nanometer scale) for the twenty-first century.
The kinetics of polycondensation of lactic acid has been investigated. The resuIts showed that in the absence of catalyst the polycondensation proceeds as a third order reaction at 124℃ with 10%～60%conversion:-d[COOH]/dt=1.32×1O-5[COOH]3. In the pres-ence of ca.1%(wt) of a strong acid ion-exchange resin at 120℃and 10%…
The acetal homopolymer is conventionally obtained by the polymerization of formaldehyde, following end capping using acetic anhydride. Asahi Chemical developed a new process to obtain an end-capped polymer during polymerization of highly purified formaldehyde using acetic anhydride as the chain-transfer agent. The use…
A model description of intermolecular electron transfer and intramolecular electron transfer (and related to it methyl transfer) reactions in organic solids are discussed. As a first step towards quantitative modeling of the reactions we construct potential energy surface in the phonon normal coordinates space. A role…
Abstract The solubility, complexation, and morphology in the Nd(NO 3 ) 3 ‐PEO and Nd(Dpm) 3 ‐PEO systems were investigated using the FTIR, DSC, TGA, WAXD, and SAXS techniques. In both systems, dissolution was verified by the absence of features characteristic of the bulk‐phase dopants detectable with WAXD and DSC, and…
Abstract The 14 N nuclear quadrupole relaxation time and resonance frequencies v + , v - , and v d of N,N-dimethylnitramine were measured between 14 and 313 K. The frequency increase of v + and v - observed below T c (108 K) is explained by the increase of p π electrons in the amino nitrogen caused by the deformation…
Abstract Einkristalle von Ba 25 Cu 14 2+ Cu 4 3+ Zn 4 O 49 wurden mit einer Kombination von Feststoff‐ und Schmelzmittel‐reaktionen dargestellt. Diese Substanz kristallisiert tetragonal, Raumgruppe D 7 4th –P4/nmm mit a = 18,2146, c = 9,3230 Å, Z = 2. Der bisher unbekannte Strukturtyp zeigt Kupfer in tetragonal pyrami…
Field measurements of beta ray energy spectra have been carried out at various locations in CANDU nuclear generating stations operated by Ontario Hydro. The beta ray energy spectrometer consists of a 5 cm diameter x 2 cm thick BC-404 plastic scintillator situated behind a 100 µm thick, totally depleted, silicon detect…
By means of high pressure differential thermal analysis we measured the pressure/temperature phase diagrams of several nematic compounds with different molecular structures. Using pressures up to about 500 M Pa we found strongly nonlinear clearing curves. This behaviour is interpreted as changes from ‘weak’ intermolec…
Free and moving boundary problems require the simultaneous solution of unknown field variables and the boundaries of the domains on which these variables are defined. There are many technologically important processes that lead to moving boundary problems associated with fluid surfaces and solid-fluid boundaries. Thes…
Abstract Reactive polymer blending of poly(β‐hydroxybutyrate) (PHB) and its valerate copolymers (PHBV) are reported, following two different methodologies, namely polymerization of rubber inclusions in the preformed matrix or reactive melt blending of preformed polymers. As second phase, poly(butyl acrylate) (PBA) and…
Crystallization behavior of cordierite-based glass with excess SiO 2 and Al 2 O 3 (CM glass) was studied at the initial crystallization stage. Two kinds of glass-in-glass phase separation occurred during the heat treatment of glass powder. The secondary glass-in-glass phase separation, which consists of an SiO 2 -rich…
Using Green's functions, we reformulate Kirchhoff's laws for a two-component random resistor network in which a fraction p of the resistors has conductance ${\mathrm{\ensuremath{\sigma}}}_{\mathrm{\ensuremath{-}}}$ and the remainder have conductance ${\mathrm{\ensuremath{\sigma}}}_{+}$. In this Green's-function formul…
Wave phenomena in intensely loaded bodies are often paradoxical and unexpected. They are evoked by stress wave interactions and depend substantially on actual material properties, body shapes and dimensions, friction, etc. Their proper understanding is indispensable for the reliable evaluation of the quality of variou…