Materials Literature
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The paper reports on the results of complex investigations into the physical properties of synthetic quartz single crystals and quartz powders in the temperature range of the α-β transition with the use of neutron diffraction and mechanical spectroscopy. The crystal structure of quartz powders with different average s…
We have investigated the current flow path between the nanotube and the contact electrode in carbon nanotube devices using multiprobe devices. The contact and channel resistances have been evaluated by two methods; transmission-line-model technique and four-probe measurement. By comparing the results, we have found th…
Nanocomposite materials differ from the traditional composite materials in that they provide enhanced properties at comparatively low filler loading with respect to microsize filler. In this research work, silica filled polypropylene micro and nanocomposites were prepared and compared in terms of their thermal propert…
Low carbon 25Cr–35Ni steel (HP type steel) modified with titanium and zirconium has been produced by centrifugal casting. The different phases present in the as cast and aged conditions were described by light optical and scanning electron microscopy with secondary electron imaging and energy dispersive spectroscopy.…
Cost‐efficient ceramic SiCN fibers were produced by the precursor route consisting of four processing steps: synthesis of the polymer, melt‐spinning, curing via electron beam (e‐beam) and subsequent pyrolysis at 1100°C in a nitrogen atmosphere. A special solid and meltable fiber polymer, the so‐called polycarbosilazan…
Microbiologically influenced corrosion (MIC) is very severe corrosion for constructions buried under sea mud environment. Therefore it is of great importance to carry out the investigation of the corrosion behavior of marine steel in sea mud. In this paper, the effect of sulfate-reducing bacteria (SRB) on corrosion be…
A three-dimensional computational fluid dynamics (CFD) model has been created to model high-temperature steam electrolysis in a planar solid-oxide electrolysis cell (SOEC). The model represents a single cell as it would exist in an electrolysis stack. Details of the model geometry are specific to a stack tested at the…
Equimolar copolymerizations of glycolide and L‐lactide were conducted in bulk in the temperature range from 100 to 160°C. The catalytic efficiency of tin(II)2‐ethylhexanoate (SnOct2) and bismuth(III)n‐hexanoate (BiHex3) were compared under identical conditions. Furthermore, four copolymerizations were conducted with b…
A surface coating of silver of CrO 2 nanoparticles at an early stage of growth leads the latter to grow in an anisotropic shape of nanorods. When heating in polymer molecules of polyvinyl alcohol (PVA) in water at ∼90 °C fibrils as long as 10−50 μm (∼300 nm diameter) have developed embedding in the polymer. Small PVA…
Abstract Layer‐by‐layer (LBL) self‐assembly was used to form polymer/clay complexes on paper to enhance its wet strength properties. Initially, alternating layers of poly(allylamine hydrochloride) (PAH) and Kaolin clay were sequentially deposited on quartz substrate and characterized by UV/Vis/NIR spectroscopy as a mo…
Lanthanum strontium manganite ((La 0.8 Sr 0.2 ) 0.9 MnO 3 ; LSM) powder was successfully synthesized by an aqueous gel‐casting technique, using carbonaceous precursors. Both thermal and X‐ray diffraction analysis confirmed that the gel‐casting LSM powder formed a single perovskite phase at 850°C, which is 100°–150°C l…
(0002) textured and epitaxial ZnCo0.07O films were fabricated at room temperature by ion beam deposition on Si substrates. Hall measurement revealed that ZnCo0.07O films were n-type semiconductors with carrier concentrations higher than 1019∕cm3. The carrier concentration of ZnCo0.07O can be manipulated by controlling…
Abstract Estimates of cement phase composition have traditionally been made using bulk chemical analysis and the Bogue calculations, developed over 75 years ago. X-ray powder diffraction analysis provides an alternative with direct phase determination, qualitatively and quantitatively. The Rietveld method to refine mu…
The use of finite element analysis (FEA) solvers in order to explore the field distribution is a common practice for designing custom made magnetic components. However, the use of the field distribution information for the generation of a model valid to be simulated in a circuit simulator is not evident. There are sev…
We have investigated the structure and the spin polarization of Co2MnAl, Co2MnSn, and Co2MnAl0.5Sn0.5 alloys. The structures of the Co2MnAl and Co2MnSn alloys that were annealed for four days at 450°C were B2 and L21, respectively. Co2MnAl0.5Sn0.5 had a dendrite microstructure that was formed by the phase separation i…
During structure solution of Ag-, Cu-bearing minerals it is quite common to observe disorder. Ag + and Cu + , indeed, can occur in different, but overlapping sites. The typical way to deal with these kind of minerals in structure determination is to use a split-atom model. This approach, however, has several disadvant…
The glass‐forming region in a GeSe 2 –As 2 Se 3 –PbSe system was determined, and the dependence of properties on the composition as a formula of 20 GeSe 2 –(80− x )As 2 Se 3 − x PbSe ( x =0–30) was investigated. Measurements include density, differential scanning calorimetry, X‐ray diffraction, Vis‐NIR, and IR transmi…
Preparation of (001) oriented Pb(Zr,Ti)O3(PZT) thin films and their applications to a sensor and actuators were investigated. The (001) oriented PZT thin films were epitaxicially grown on (100)Pt/(100)MgO single crystal substrates by rf-magnetron sputtering. The PZT thin films on (100)Pt/(100)MgO buffer layer/glass su…
Abstract One‐dimensional porous silicon photonic crystals can be considered as optical double layers. The reflectivity spectrum of the structure displays a strong peak corresponding to the stop band of the photonic crystal (rugate filter) and Etalon fringes due to Fabry‐Pérot interference in the porous silicon film. T…
Mn-doped CuO nanoparticles were synthesized using a coprecipitation method. Powder x-ray analysis reveals that all the samples crystallize into a monoclinic-type structure. Significant changes occur in both the microstructure and particle size with calcination temperature TA. The average particle size d increases from…