Materials Literature
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The properties of single crystals of weakly doped lanthanum manganites La 1− x A x MnO 3 (A = Ca, Ce, Sr; x = 0, 0.07−0.1) have been studied in the temperature range from 77 to 400 K. It is established that these lanthanum manganites exhibit (in addition to the well-known characteristic features observed in the region…
Deformed under optimum conditions of temperature and strain rate, coarse-grained aluminum alloys show elongation to failure in excess of 300%. The strain rate sensitivity index and the activation energy point to solute drag creep as the principal mechanism, a mechanism that has virtually no grain size dependence. The…
Abstract ESR measurements were made with vulcanized rubbers of a gum, three carbon black filled and a silica filled compounds. The radicals in the filled rubbers were found to have long lives unlike the gum rubber. Carbon black was found to reduce the sensitivity of ESR due to shielding effect in the magnetic field. T…
The preparation and spectroscopic studies of Cu2+ in xPbO-(100−x) B2O3 non-linear optical glassy system have been studied. From IR studies, it is observed at low concentration of PbO (less than 40 mole%), it acts as a glass modifier. At higher concentration, it takes part in the network. The hyperfine splitting in the…
This article presents partial discharge testing of medium voltage cables. Utility engineers are faced with decision on whether to replace some of the older cables in their underground distribution systems. Today, measurement of PD at voltages above 1 Vg on extruded cables more than fifteen years old may not indicate t…
Complex dielectric constants of SrTiO 3 ceramics and single crystals were measured in the temperature range of 303 K to 673 K and the frequency range of 100 mHz to 100 kHz. It was found that the ceramic sample exhibits a steplike colossal dielectric relaxation similar to the distorted perovskite CaCu 3 Ti 4 O 12 , whi…
Abstract The investigations presented in this contribution were targeted to replace a gear group made up of SAE 8620 steel in army jeeps with microstructural controlled austempered ductile iron, in order to reduce the manufacturing steps. Furthermore, the vibrations were also expected to decrease, due to the applicati…
Following the recent report that the tetragonal phase of Pb(Zr x Ti1− x )O3 (PZT) with compositions close to the morphotropic phase boundary (MPB) transforms to a monoclinic phase with Cm space group at low temperatures, we reported yet another low temperature phase transition in which the Cm phase transforms to anoth…
Five types of non‐symmetric calamitic dimers were synthesized to investigate the effect of the core structure and length of the spacer on mesomorphic properties. Two non‐symmetric dimers containing a troponoid and benzenoid unit showed smectic A and C phases whereas the corresponding benzenoid dimers showed no mesopha…
Processes like ultrasound, chlorination and filtration-adsorption were compared to eliminate microorganisms and to adjust established parameters of public drinking water. A mini water treatment plant (WTP-CB), in pilot scale, was projected and built to evaluate each process influence as: decontamination, coagulation-f…
Potassium tetraperoxomolybdate (VI) K 2 [Mo(O 2 ) 4 ] was prepared, and its X-ray powder diffraction pattern was recorded at low temperature (258 K). The unit cell parameters were refined to a =10.7891(2) Å, α =64.925(3)°, space group R −3 c (167), Z =6. The compound is isostructural with potassium tetraperoxotungstat…
Barium strontium titanate (BST) thin films have been intensively studied as a frequency and phase agile materials for the tunable microwave devices such as tunable filter, phase shifter and phased array antennas. The dielectric properties of BST thin films, including the dielectric constant, dielectric loss and tunabi…
Abstract The performance of a fluidized cracking catalyst additive prepared from caustic-modified kaolin microspheres for gasoline S reduction was investigated using N 2 adsorption, infrared acid-site characterization, X-ray diffraction and small-scale fluid bed reactor tests. The additive exhibited improved coke sele…
The synthesis of the poly(carbonate) and poly(thiocarbonate) derived from the diphenol bis(4-hydroxyphenyl)-phenylmethylsilane and the poly(ester) derived from the same diphenol and the acid dichloride bis(4-chloroformylphenyl)-phenylmethylsilane are described. Polymers were synthesized under phase transfer conditions…
Flower‐like nanostructural ZnO has been fabricated through lower concentration gemini surfactant‐assisted hydrothermal oxidization of zinc metal at 150°C. The resultant powdered products were characterized by means of X‐ray diffraction (XRD), energy dispersive X‐ray spectroscopy (EDX), transmission electron microscopy…
The electronic structure of Cu hexafluoroacetylacetonate, crystallized with a stable nitronyl nitroxide radical [V.I. Ovcharenko, K.Y. Maryunina, S.V. Fokin, et al., Russ. Chem. Bull. 53 2406 (2004)], is calculated from first principles within the density functional theory using the SIESTA method, in two magnetic conf…
New orthophosphates K 2 Mg 0.5 Zr 1.5 (PO 4 ) 3 , Rb 2 Mg 0.5 Zr 1.5 (PO 4 ) 3 , and Cs 2 Mg 0.5 Zr 1.5 (PO 4 ) 3 are synthesized and characterized by X-ray powder diffraction and IR spectroscopy. These orthophosphates crystallize in the structure type of the mineral langbeinite (cubic system, sp. gr. P 2 1 3, Z = 4).…
This paper discusses some properties of the polypropylene (PP)/ethylene-propylene diene terpolymer (EPDM)/natural rubber (NR) blends, such as tensile properties, heat resistance, gel content, and morphology. Dicumyl peroxide (DCP) and N,N-m-phenylene bismaleimide (HVA-2) and their combination were applied in PP/EPDM/N…
The principal objective of the present study is to improve the mechanical properties of polychloroprene through the addition of montmorillonite (MMT). Three modifying cations are tested. The polychloroprene–MMT composite is characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron…
A surface-plasmon sensor, in the attenuated-total-reflection configuration, is modeled by a glass-metal-dielectric-air structure, where a dielectric film with anisotropic permittivity models the material (or particulates) to be sensed. The laser beam, polarized in the plane of incidence, is obliquely incident on the g…