Materials Literature
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Susceptibility to radiation of rare-earth elements and transition metals in Y3Al5O12, YAlO3, LiNbO3, SrGdGa3O7 single crystals was investigated. Additional absorption bands after g-irradiation with doses 103-107 Gy and protons with fluencies of 1013-1016 cm-2 were found. A decrease in additional absorption with increa…
We report 17 O magic-angle spinning (MAS) NMR data for crystalline NaAlO 2 and CaAl 2 O 4 at external magnetic fields of 9.4 and 14.1 T, as model compounds for Al-O-Al sites in tetrahedral networks. The former contains one peak with isotropic chemical shift (δ iso ) = 30.9 ppm and quadrupolar coupling constant (C Q )…
The electronic structure of perovskite manganese oxides is investigated in terms of a Kondo lattice model with ferromagnetic Hund coupling and antiferromagnetic exchange between ${t}_{2g}$ spins using a finite temperature diagonalization technique. Results for the dynamic structure factor are consistent with recent ne…
Dimeric tetrathiafulvalene (TTF) derivatives may be useful for increasing the dimensionality in materials with conducting properties, since the stacks or slabs formed by the TTF moieties may be coupled together in a second or third direction through the bridging group. Here is reported the synthesis of a novel twin-π-…
Neutron diffraction patterns, collected at room temperature and, with in situ thermal treatment, from 981 to 1173 K, on a zirconia sample containing 3 wt% of sodium, show the presence and the stability of the cubic form of zirconia from 298 to 1073 K. The analysis has also demonstrated the presence of a significant am…
Abstract The adsorption of DL-alanine at pH 4, 6 and 8 by a soil allophane has been determined. Two sets of experiments were carried out: (1) in which the allophane had been kept in a moist state throughout; and (2) in which the mineral had previously been dried at 50°C. In both instances, the adsorption isotherms sho…
The Si L 2,3 core-loss edge can be used to probe the crystal chemistry around Si, providing information on the s- and d-like partial density of unoccupied states of the Si-O bonds. We present Si L 2,3 edges from 59 silicates, glasses, and amorphous materials acquired by parallel electron energy-loss spectroscopy (PEEL…
Experimental studies of the ferromagnetic resonance spectra of polycrystalline hexagonal ferrites of the system Co 2− x Zn x W in the frequency range 16–32 GHz are described. It is shown that interpretation of the experimental data requires the assumption of an anisotropic effective magnetomechanical ratio (or g -fact…
Different semiaromatic polyamides (SAPA) have been synthesized by step-growth polymerization of an aliphatic diamine, M (the 2-methyl 1,5-pentanediamine), and isophthalic acid, I, or terephthalic acid, T, or mixtures of these two diacids. The influence of the relative amount of randomly distributed MT units on the vis…
Large-volume usage of textile and carpet fibrous waste may be achieved with a low-cost material that has woodlike properties. Formulations and properties of composites, laminates, and honeycomb sandwich constructions made from carpet and textile fibrous waste in a high-modulus phenol formaldehyde matrix are described.…
Two-photon-excited luminescence (TEL) spectra have been recorded in the blue (400–500 nm) and near-ultraviolet (300–400 nm) ranges for diamond particles with 4 nm average size, which were obtained by detonation synthesis from explosives. The observed TEL bands are attributed, by comparing the obtained spectra with the…
The systems were examined as a cathode for use in solid oxide fuel cells. The electrical conductivity and cathodic polarization on an 8 mol % yttria‐stabilized zirconia (8YSZ) electrolyte had acceptable values for certain compositions. Thermal expansion measurements were taken, showing compatibility of Mn‐rich composi…
The compatibility of poly(ethylene terephthalate) and its copolymer containing isophthalate units with epoxy-modified lignin has been studied. The following methods have been used: DSC, thermogravimetry, IR spectroscopy, contact angle measurements and dielectric properties determination. The optimum compatibility rati…
In this paper, the concept of Environmentally Conscious Ferroelectrics (abbr. as Ecoferroe-lectrics) is emphasized, the evaluation methodology of the preparation, processing, and applications of ferroelectrics on environmental load is proposed, the present researches on Ecoferroelectrics are outlined, and some aspects…
Abstract Vermiculite crystals from Santa Olalla, Spain, were first Na exchanged and then intercalated with monomethylammonium (= NH 3 (CH 3 ) + , MMA) and dimethylammonium (= NH 2 (CH 3 ) 2 + , DMA) molecules, respectively, by immersion in 1 M ammonium-chloride solutions at 65°C for 2–3 wk. MMA-and DMA-exchange with v…
A process for the manufacture of highly inorganically filled starch based fiber reinforced foam composites for food-packaging use is described. Starch, obtained from potato, corn, or other sources, is used as binder to form net shape foam composite substrates under hydrothermal conditions. The starch content is 25 to…
The activation energy of ionic conductivity in a variety of glasses has been studied from a unified point of view. A plot of the activation energy as a function of the cation–anion distance manifests that the glass can be divided into two groups; the examples being chalcogenide and oxide glasses. In the chalcogenide t…
Raman spectroscopy was used as a complementary tool to thermal and x-ray methods in phase equilibrium studies of the NaNO3–KNO3 system. Based on the microscopic structures of the system, the Raman technique confirned the phase diagrams obtained by thermal studies. Structural phase transitions of the R3m solid solution…
Abstract : Non-woven fabrics composed of nanofibers have a large specific surface area and small pore size compared to commercial textiles. These properties make such non-woven fabrics excellent candidates for filter and membrane applications, particularly in the areas of chemical and biological agent defense. Nanofib…
Optimal coil configurations in a split-type superconducting MRI magnet have been investigated, and the feasibility of the compact and high performance magnet is presented. A highly homogeneous magnetic field of about 10 ppm/50 cm diameter spherical volume (DSV) is attainable by eliminating error fields of higher order…