Materials Literature
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Controlled coammonolysis of elementalkylamides in aprotic organic solvents at low temperatures have been shown to result in the formation of polyazanes. The synthetic procedure developed may be addressed as “sol-gel-route in the ammono system”. Pyrolysis of these novel polymer precursors gave access to multinary nitri…
The influence of biofilms formed by microorganisms on the corrosion behaviour of stainless steel (SS) in various fresh water environments was studied using electrochemical techniques. Biofilm characterization studies showed an algal-dominated biofilm in the normal dark and light exposures, whereas, in the continuous d…
Analysis using gas chromatography/mass spectroscopy (GC/MS) was performed for evaluation of surface degradation of silicone insulating materials. Silicones are used as coatings for porcelain insulators and shed material for high voltage composite insulators. A comparison between virgin silicone rubber and aged silicon…
Cell ellipticity and non-planar membranes are thought to be dominant degradation factors of cellular metals. The mechanisms operating at the cell/membrane level in both closed and open cell Al alloys have been established by following the evolution of deformation with cell-level resolution using digital image correlat…
We present the experimental framework for the origin of the anomalously large thermoelectric power for Si and Au-doped Ge superlattice thin film. The thermoelectric power of the sample still remains anomalously large even though the superlattice structure begins to collapse. An amorphous Ge thin film displays large th…
We present experimental evidence that the diffusion process close to the boundary is fundamentally different from the bulk diffusion in the sense that it is affected by the scattering properties of the individual centers. Systematic measurements show a nontrivial behavior of the extrapolation length ratio on the scatt…
The metalation of several free base porphyrins by the bismuth salts Bi(NO 3 ) 3 and Bi(SO 3 CF 3 ) 3 in DMF or pyridine is described. The resulting stable Bi(III) porphyrin complexes are characterized by electrochemistry, 1 H NMR and UV-vis spectroscopy. The structure of ( OEP ) Bi ( SO 3 CF 3 ) was also determined by…
The deformation behavior of a hot‐pressed, fine‐grained β‐Si 3 N 4 ceramic was investigated in the temperature range 1450°—1650°C, under compression, and the results for strain rate and temperature dependence of the flow stress are presented here. The present results show that the material is capable of high rates of…
The objective of this work was to study the anticorrosive behaviour of three commercial pigments containing micronized zinc phosphate. The chemical analyses of the pigments were carried out in the laboratory to characterise them with respect to their composition and soluble matter. It was proposed to check pigments’ e…
The magnetic susceptibility and spin-spin correlation of the double-exchange model for doped manganites are investigated through the Monte Carlo calculations on the three-dimensional lattice model. Deviations of the susceptibility from the Curie-Weiss behavior above the ferromagnetic ordering temperature ${T}_{c}$ see…
Recent studies have shown that soil organic carbon (OC) may either hinder or favor the sorption of dissolved organic matter (DOM) in soils. Our concept was that the nature of soil OC determines these contrasting findings. To test this hypothesis, we compared the DOM sorption in soils with OC derived from biomass decom…
FT-IR imaging employing a focal plane array (FPA) detector is often plagued by low signal-to-noise ratio (SNR) data. A mathematical transform that re-orders spectral data points into decreasing order of SNR is employed to reduce noise by retransforming the ordered data set using only a few relevant data points. This a…
A metal-ferroelectric-metal-oxide-semiconductor field effect transistor (MFMOS-FET) with a Pt/SrBi 2 Ta 2 O 9 /Pt/Ti/SiO 2 /Si structure was fabricated on a silicon-on-insulator (SOI) structure in order to improve the memory retention characteristics of ferroelectric neuron circuit. The area ratio of MOS capacitor to…
Abstract Reduction of structural Fe in Na-exchanged dioctahedral smectites decreases swellability in water, but because clay interlayers also collapse in the process the concomitant effect on surface hydration energy is uncertain. This study examined the hydration behavior of oxidized and reduced dioctahedral smectite…
Natural II-a type diamond is increasingly used for the fabrication of radiation detectors. However, the presence of inherent defects has a strong impact on the detector characteristics such as the time-dependent stability of the detection signal. In order to draw better insight into this effect, comparative investigat…
A series of new strictly alternating aromatic poly(ester-imide)s having inherent viscosities of 0.20–0.98 dL/g was synthesized by the diphenylchlorophosphate (DPCP) activated direct polycondensation of the preformed imide ring-containing diacid, 3,3-bis[4-(trimellitimidophenoxy)phenyl]phthalide (I), with various bisph…
Europium β‐diketonates have desirable optical properties, and transparent inorganic materials that have been doped with these chelates seem to be promising for potential applications in luminescence‐display devices, integrated optical device sources, and new visible lasers. However, these chelates may be decomposed or…
Monazite (LaPO 4 ) has been proposed as an interphase to promote debonding between the reinforcement and the matrix during the fracture of oxide‐based composites. The correlation between fracture behavior and micromechanical properties in model alumina/monazite (Al 2 O 3 /LaPO 4 ) multilayer laminates has been investi…
Within the framework of the effective-field theory, the phase diagram (transition temperature Tc and critical transverse field Ωc) of a ferroelectric bilayer system is studied on the basis of the spin-1/2 transverse Ising model consisting of two different ferroelectric slabs with the same thickness L. The dependences…
There has been a substantial growth in the application of mass spectrometry (MS) methods for the analysis of inorganic materials, due to the inherent sensitivity of mass spectrometry ionization to the specific composition and structure of the analyzed materials. To date, few mass spectrometry studies have focused on m…