Materials Literature
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Crystallization of sol-gel derived Pb 1−x Ca x TiO 3 powders have been investigated using TG-DTA technique, X-ray diffraction and FT-IR spectroscopy. The thermograms obtained on as fired PbTiO 3 powder showed a dominant exotherm at ∼450°C, and is well supported by X-ray diffraction indicating single-phase formation. W…
Abstract Transition metal complexes of linear and crosslinked styrene‐maleic acid copolymer were prepared in ethyl alcohol. The complexes appear as micro clusters fairly uniformly distributed in the copolymer matrix. Vapor adsorption–desorption studies of the complex beads with methyl isobutyl ketone (MIBK), toluene a…
Abstract Mica-chlorite mixed-layering was identified by X-ray diffraction (XRD) as a major or subordinate constituent in several slates of the Puncoviscana Formation from Sierra de Mojotoro (Eastern Cordillera, NW Argentina). In order to determine the crystallochemical characteristics of these mixed-layered sequences…
The advantages and uniqueness of the Inorganic modification of the Sol-Gel method have already been described. Homogeneous nano-composites as well as some exotic glasses, complex-metal-oxides systems with little glass-forming ability, can be produced by this method. Thus, the obtained materials are characterized by a…
The solid solution of the ferroelectric relaxor (Na 1/2 Bi 1/2 )TiO 3 with BaTiO 3 , (1-x) NBT-x BT (NBT-BT) shows a morphotropic phase boundary with enhanced properties at x = 0.06-0.07. We have prepared targets.of (1-x) NBT-x BT with x = 0.06 by solid state reaction and sintering at 1200°C, up to a final relative de…
The primary thermogram of the bamboo fibers belonging to the species Dendrocalamus strictus is recorded in an inert atmosphere at a heating rate of 10 C/min. Using this thermogram and its derivative, initial and final degradation temperatures and inflection points are found. Using the Freeman and Carroll method, the k…
Abstract The phonon polariton modes in the bulk porous III–V semiconductor materials like GaP and GaAs are investigated for different porosity values. Their behavior under an external hydrostatic pressure is also studied. The frequencies of the various modes shift to higher values. The model has been extended to the c…
Synthesis of new, porphyrin-containing peptidyl aminophosphonates is described. The products, derived from 5-(4′-carboxyphenyl)-10,15,20-tri-p-tolylporphyrin and some heterocyclic aminophosphonates were obtained in high yield in the reaction of the 5-(4′-carboxyphenyl)-10,15,20-tritolylporphyrin with selected thiophen…
An efficient finite element method for predicting critical temperature, postbuckling deflection and flutter response is developed for composite plates embedded with prestrained shape memory alloy (SMA) fibers. The large panel deflection and the temperature-dependent material properties of SMA and composites are consid…
Hydrogen permeation tests were carried out on supermartensitic stainless steel membranes under cathodic protection conditions in ASTM seawater. In contrast to other observations, only a modest reduction in hydrogen uptake due to calcareous scale was observed after 75 days of exposure. In view of the variable results f…
Ongoing studies of the RbHSeO4–RbH2PO4 system, aimed at developing novel proton conducting solids, resulted in the new compound Rb2(HSeO4)(H2PO4) (dirubidium hydrogenoselenate dihydrogenophosphate). Single-crystal X-ray diffraction (performed at room temperature) revealed Rb2(HSeO4)(H2PO4) to crystallize in space grou…
Abstract Natural rubber (NR) is a high molecular weight (MW) hydrophobic polymer, which can not be easily dissolved in several kinds of solvents, leading to the limitation of usage. NR latex containing low MW and reactive-terminal groups is another interesting form to extend the applications of NR. In this study, a ph…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
The effects of noble metal deposition under hydrogen water chemistry (HWC) condition on the features of oxide film formed on structural components in a reactor were studied. Noble metal-deposited type 304 stainless steel specimens with an oxide film were exposed to the simulated HWC condition, including co-existing Co…
Metal/oxide/semiconductor capacitors with a Ga2O3 layer were fabricated on p-type Si (100) substrates by the rf magnetron sputtering technique. The Ga2O3 thin films showed uniform surfaces and stable interfaces. The dielectric properties of the MOS structure according to the annealing temperature and thickness of the…
A wide range of novel multicomponent amorphous alloys can be manufactured by rapid solidification processing. This paper describes different types of multicomponent alloys: chill cast equiatomic substituted fcc and fcc/bcc CrMnFeCoNiNbGeVTi alloys, melt spun equiatomic substituted amorphous and quasicrystalline TiZrHf…
Novel flame retardant unsaturated poly(ester amide) resins (FR-UPEAs) were prepared by the reaction of brominated epoxy resins (BER) with unsaturated aliphatic bisamic acids using a base catalyst. These FR-UPEAs were characterized by elemental analysis and number average molecular weight determination by non-aqueous c…
The crystallographic texture of electrolytic tough pitch copper has been investigated by neutron diffraction after deformation by cold wire-drawing (reduction of area between 51 and 94 %) and after static recrystallization. The deformation texture characterized by a strong <111> fiber is reinforced with increasi…
Magnetic and galvanomagnetic properties of single crystals of a new dilute magnetic semiconductor p -Sb 2− x Cr x Te 3 ( x = 0, 0.0115, 0.0215) are investigated in a temperature range of 1.7–300 K. A ferromagnetic phase with a Curie temperature of T C ≈ 5.8 ( x = 0.0215) and 2.0 K ( x = 0.0115) is detected. The easy m…
Abstract Under mild ambient conditions gallium phosphide (GaP) nanoparticles were employed to carry out the reduction of nitrogen. By using Nessler's reagent ammonia was detected in the slurry where the aggregated GaP particles were suspended in water and bubbled by pure nitrogen. Dependence of the concentration of am…