Materials Literature
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The modal analysis of samples belonging to the zeolite-rich pyroclastic formation named “Neapolitan yellow tuff” (Central and Southern Italy) has been determined by full-profile refinement of X-ray powder diffraction (XRPD) data using a combined Rietveld–RIR method. The quantitative analysis and especially the zeolite…
Abstract The new phases M III Sr 3 Ni III O 6 have been prepared for M = Sc, In, Tm, Yb and Lu. Thermogravimetric analysis indicates that these phases are stoichiometric nickel(III) oxides. Rietveld refinement of their crystal structures from powder X‐ray diffraction data confirms that they adopt the rhombohedral K 4…
A mathematical model for the description of the overall crystallization of polymers has been developed which separates the pure geometric spreading of the semicrystalline superstructures from the increasing crystallinity inside these entities. The model uses the Avrami theory for the geometric part and a freely option…
Abstract A very unusual magnetic behaviour of α - Bi 2 O 3 was observed in a wide range of temperatures and magnetic fields. A longitudinal magnetoelectric effect was found at 4.2 K. The existence of an antiferroelectrically ordered subsystem of electric dipoles in α - Bi 2 O 3 is proposed. The mechanism of spin-orbit…
Abstract In this paper the corrosion behaviour of copper in 5% (by weight) citric, sulphuric and hydrochloric acids is studied. The efficiency of 2‐amino‐5‐mercapto‐1,3,4‐thiadiazole (AMT) as a corrosion inhibitor is compared with the use of benzotriazole (BTA). The experimental techniques were weight loss, polarizati…
N‐benzyl triethanol ammonium chloride (BTAC) and ethoxylated n‐benzyl triethanol ammonium chloride (EBTAC) were synthesized. The prepared compounds were characterized, then tested for their evaluation as corrosion inhibitors for steel pipelines in typical crude oil and residual fuel oil (RFO) media through weight loss…
The TL properties of Li2B4O7:Cu have been studied in single crystal samples grown by the diameter controlled Czochralski method. The TL measurements have been performed using a home-made high sensitivity 3D spectrometer, using a heating rate of 1 oCs.-1. Two peaks have been detected in the glow curve, at 145 oC and 20…
In vacuo thin films of the phthalocyanine derivatives TPyTAPZn and F16PcZn show n-type behavior in thermopower and conductivity measurements. After exposure to air the properties are changed characteristically. Photoelectrochemical experiments show that while TPyTAPZn still behaves like an n-type semiconductor, F16PcZ…
In experimental murine inflammation-associated amyloidosis (AA amyloidosis), an interaction between heparan sulfate and serum amyloid A (SAA), the AA precursor, has been demonstrated and is believed to play an important role in AA amyloidogenesis. Poly(vinylsulfonate) sodium salt (PVS) can arrest AA amyloid induction…
Other| June 01, 1996 Microstructures and high-temperature phase transitions in kalsilite Michael A. Carpenter; Michael A. Carpenter University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom Search for other works by this author on: GSW Google Scholar Daniela Cellai Daniela Cellai Search for othe…
Diamond has a low atomic number (Z = 6) and is therefore essentially soft tissue (Z = 7.4) equivalent. As such, diamond is an attractive material for applications in dosimetry in which the radiation absorption in the sensor material should be as close as possible to that of soft tissue. Synthetic diamond prepared by c…
New experimental results on TL properties of dosimetric a-Al2O3 crystals are analysed. The nature of the TL peak at 410-480 K is discussed. Energy parameters of the centres participating in the formation of the peak are determined. Carbon ions (atoms) participate little in the formation of luminescence properties of t…
The grafting of 4-vinyl pyridine (VP) to styrene-butadienestyrene triblock copolymer (SBS) by radiation-induced graft copolymerization was studied. The cohesive properties such as cohesive energy (Ecoh), molar volume (V), solubility parameter (delta), molar molecular weight (WM), specific volume (Vg), and density (1/V…
This paper discusses tree inception and breakdown voltage characteristics of XLPE cable insulation subjected to impulse voltages superimposed on ac voltage. The tree initiation tests were performed on laboratory-molded specimens equipped with needle electrodes, whereas the breakdown tests were conducted on a full-size…
As device geometry shrinks to 0.35 μm and below, the parasitic capacitance between closely spaced metal lines becomes important in terms of resistance‐capacitance time delay in device switching. In this study, we investigated the use of fluorine doped plasma enhanced chemical vapor deposition grown silicon oxide thin…
Abstract This paper presents the results obtained using a new method for analyzing polymer blend morphologies. The method is based on the selective solubilization of the matrix followed by a separation of the dispersed phase in suspension by filtering. A suspension of the nodular part going through the filter is obtai…
The Kossel diagram technique has been used in the study of the blue phases of liquid crystals for some years. In this paper quantitative information extracted from Kossel diagrams of blue phases one (BPI) and two (BPII) is presented. The method used provides absolute measurements of the lattice parameters in these blu…
In this paper, finite-element method (FEM) formulations with edge elements for directly calculating the phase constants of ferrite-loaded waveguides with arbitrarily magnetized directions are presented. Dispersion characteristics are calculated for the partially-filled ferrite rectangular waveguide structure, where th…
A systematic investigation of the properties of LiF:Mg,Cu,P has been performed with respect to the concentration of Mg (0-1.0 mol%), Cu (0-0.5 mol%) and P (0-5.0 mol%) activators. 120 different samples of LiF:Mg,Cu,P material were prepared using uniform batches of chemical substrates. From each material a group of sin…
A general theory for the spatial ordering of immobile clustered defects in irradiated materials is presented here. A vectorial form for the Fourier transforms of perturbations in the concentration of point and clustered defects is derived. Linear stability analysis indicates that, under conditions appropriate for void…