Materials Literature
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Low temperature polarized single-crystal absorption and luminescence spectra of Cr(V)-doped YVO4 and the powder luminescence spectrum of Cr(V)-doped YPO4 are reported and discussed. A rich fine structure and strong polarization effects are observed in the near-infrared. Due to a strong interaction of the Cr(V) ion wit…
A thermodynamic study of the Ti–O system at 1573 K has been conducted using a combination of thermogravimetric and emf techniques. The results indicate that the variation of oxygen potential with the nonstoichiometric parameter δ in stability domain of TiO2−δ with rutile structure can be represented by the relation, Δ…
Protonic conductivity measurements are reported for H3PW12O40x21H2O single crystals in the temperature range 77 to 303 K. At room temperature, the conductivity is 0.18 Sm-1 and falls to a minimum of 0.26×10-3 Sm-1 at 188 K. An anomalous behavior in conductivity observed in the temperature range 263 to 283 K is reporte…
The association strength of positively charged porphyrins with anionic species can be orders of magnitude higher than reported in the literature, depending on the chosen buffer; the buffer also determines the dominating interaction mechanism, leading to stronger stacking contributions at higher salt concentrations; ev…
On the addition of β-cyclodextrin, the proportion of the photoactive anti-parallel conformation of photochromic 2,2′-dimethyl-3,3′-(perfluorocyclopentene-1,2-diyl)bis(benzo[b]thiophen-6-yltrimethylammonium) iodide (1a) increased, and the cyclization quantum yield was found to increase. On the other hand, the proportio…
The high-speed melt spinning of sheath/core type bicomponent fibers was performed and the change of fiber structure with increasing take-up velocity was investigated. Two kinds of polyethylene, high density and linear low density (HDPE, LLDPE) with melt flow rates (MFR) of 11 and 50, [HDPE(11), LLDPE(50)], and poly(et…
In this work, the solvent effect on the miscibility between poly(vinyl chloride) (PVC) and poly(methyl methacrylate) (PMMA) in ternary polymer solutions was examined by the viscometric method. In these systems, we could understand that the used solvents, tetrahydrofuran (THF) or N,N-dimethylformamide (DMF), mainly aff…
Abstract Knowledge of the Young's moduli is necessary for piezoelectric ceramics in order to separate the total deformation into an elastic and a plastic contribution. The methods for the determination of the Young's moduli, well known from conventional ceramics, are much more complicated due to the special electrical…
Extending the useful life of materials through recycling has proven to be an efficient means of reducing natural resource use and limiting the production of waste. In the case of polymer-based materials, in general, and of packaging materials, in particular, material recovery is complicated by the presence of incompat…
The synthesis, crystal structure, magnetization, and resistivity of Gd-doped ${\mathrm{Eu}}_{14}{\mathrm{MnSb}}_{11}{,\mathrm{}\mathrm{Eu}}_{13.97}{\mathrm{Gd}}_{0.03}{\mathrm{MnSb}}_{11},$ are reported and compared to ${\mathrm{Eu}}_{14}{\mathrm{MnSb}}_{11}$ and ${\mathrm{Eu}}_{14}{\mathrm{MnBi}}_{11}.$ All three com…
In previous work, we studied the electronic structure of several molybdate and tungstate crystals having the scheelite structure. The wolframite structure is another common form for molybdate and tungstate materials. In this paper, we compare two chemically similar materials that naturally form in the scheelite and wo…
In this paper, processing conditions for producing high relative density microcellular CPET foams using CO 2 as a blowing agent are described. Starting with solid CPET, foams with relative densities between 0.5 to 1.0 were produced. Results of instrumented impact tests conducted at various temperatures ranging from ro…
In this work, and samples are prepared by solid chemical reaction. Excitation and emission spectra are investigated. The emission band is shifted to the red from 655 nm for to 670 nm for . The absorption bands of are resolved in the excitation spectrum, peaking at 280, 365, 460, and 570 nm. In contrast, the excitation…
A new frictional constant is suggested to characterize the surface mechanical properties of 1×1 rib-knitted cotton fabrics. This study examines the influence of structural variables on the frictional properties of knitted cotton fabrics. The results indicate that both the loop length and the yarn linear density influe…
The wet chemical synthesis of CaZr0.9In0.1O3 − α powders via a peroxo-oxalate complexation method has been studied in detail using different techniques, i.e. TG-DTA, XRD, FT-IR, BET, SEM, EDX, and non-isothermal densification. Using these techniques, the different reaction steps in the calcination process have been cl…
The impact of irradiation damage accumulated in fuel claddings on their mechanical behavior and their susceptibility to iodine-induced stress corrosion cracking (I-SCC) was studied in irradiated zirconium and standard Zircaloy-4 sheets subjected to interrupted tension tests in methanol/iodine solutions and in an inert…
The present study involves nitrogen NMR-NQR measurements and semiempirical as well as ab initio calculations at the different levels in three 2-nitro-5-methylimidazole derivatives. The NMR-NQR data were compared with the results of the quantum chemical calculations with the geometry optimization by seven semiempirical…
The fine structure of the methylene rocking bands obtained by high resolution and cryogenic FTIR spectroscopy was utilized to characterize the crystalline behavior of polyethylene (PE) segments in an ethylene–acrylic acid copolymers. The hydrogen bonds among the carboxyl groups play a cross-linking role and prevent th…
To evaluate the effects of on the performance of molten carbonate fuel cells, bench‐scale cell tests were performed and the meniscus heights of the electrolyte on Ni were measured with fuel gases containing various amounts of . In bench‐scale cell tests, in the fuel gas had a large effect on cell voltage in the early…
Translucent barium titanate (BaTiO3) ceramics with a relative sintered density of 85% have been successfully produced via a powderless sol–gel method, in which transparent, partially-crystallized BaTiO3 monolithic xerogels (dried gels) were prepared and submitted to sintering at 1100 °C in an oxygen atmosphere. The tr…