Materials Literature
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The upconversion emission intensities of Er3+ ion around 550 and 660 nm in fluorozirconate glasses were measured under 800 nm excitation. Though energy transfer processes played an important role in upconversion mechanism at high concentration of ErF3, those have not been treated quantitatively. The energy transfer ra…
The effects of firing temperature on the crystallinity and the luminescent properties of phosphor have been investigated over the temperature 1000–1800°C range under preparative conditions which do not use any flux such as . The effects of particle shape and size of the ingredient on the phosphor have also been studie…
β-Zn(dca)2 and 0.12% Co(II) doped β-Zn(dca)2 contain tetrahedrally coordinated metal ions within a corrugated sheet network structure [dca = dicyanamide, N(CN)2–], β-Co(dca)2 is a spin-canted antiferromagnet (TN = 9 K), while the rutile-like octahedral α-form is a ferromagnet.
Sealed alkaline solid polymer electrolyte nickel/metal hydride laboratory cells have been constructed and tested to evaluate their properties. Studies of the cycle life, self‐discharge, and behavior of cells at different temperatures were carried out. The first results on the electrochemical behavior of an alkaline so…
An idealized structural model is proposed for materials closely related to the 2H hexagonal perovskite and with general formula A3n + 3mA′nB3m + nO9m + 6n {or A1 + x(A′xB1 – x)O3, x = [0, 1/2]}. The structures of all these compounds, considered as commensurate or incommensurate modulated composites, can be described i…
Hybrid organic-inorganic materials, in which organic and inorganic components are combined over a length scale ranging from a few Angstroms to a few tens of nanometers, are nanocomposites which offer huge potentialities for high added value applications. Numerous hybrid organic-inorganic materials have been developed…
We report the synthesis and the photophysical properties of first and second generation dendrimers built around a [Ru(bpy)3]2+ core (bpy=2,2′-bipyridine) and bearing 12 and 24 naphthyl units, respectively, in the periphery. The metallodendrimers were obtained by complexation of ruthenium trichloride with bipyridine li…
We perform a comprehensive survey of the potential energy landscapes of 13-atom Morse clusters, and describe how they can be characterized and visualized. Our aim is to detail how the global features of the funnel-like surface change with the range of the potential, and to relate these changes to the dynamics of struc…
Gluconamides can be easily functionalized to give a variety of compounds that form organogels with a high viscosity. N - n -octyl- d -gluconamide-6-benzoate gelates a large variety of organic solvents, including 1,2-xylene, chloroform, ethyl acetate, and ethanol, to form gels which are, in some cases, stable even abov…
Template-directed co-condensation was used to synthesize organo-functionalized MCM-41 silica hexagonal mesophases containing binary combinations of covalently linked phenyl and amino, thiol or allyl moieties; similar methods were used to prepare a phenyl-functionalized organo-MCM-48 silica with cubic structure.
The electrical conduction properties of rf sputter-deposited (Ba, Sr)TiO3 (BST) films on Pt and IrO2 electrodes and metalorganic chemical vapor deposited (MOCVD) BST films on a Pt electrode were investigated and a new energy band model that satisfactorily explains the observed leakage current characteristics and film…
The structure of the amorphous walls of the mesoporous material MCM-48 was investigated with a combination of high-resolution transmission electron microscopy and selected area electron diffraction, and the three-dimensional structure was reconstructed by electron crystallography. The crystals were well ordered over l…
Mn(N3)2(pyz) (pyz = pyrazine) consists of ferromagnetically coupled linear chains of {Mn(N3)2}n comprised of µ-1,1-azido bridges together with µ-pyz ligands to afford 2-D planar layers.
Optical storage properties of thin unoriented liquid crystalline and amorphous side-chain azobenzene polymethacrylate films are examined by polarization holographic measurements. The investigated materials are free radical copolymers derived from two photochromic monomers, 6-(4-oxy-4‘-cyanoazobenzene)hex-1-yl methacry…
The synthesis, structural characterization, and magnetic properties of a new Prussian blue analogue, the molecule-based ferrimagnet (V IV O)[Cr III (CN) 6 ] 2/3 · 10 / 3 H 2 O ( 1 ) ( T C = 115 K), are presented. The crystal structure is determined from the powder X-ray diffraction diagram using the Rietveld method. T…
The mechanical stability of homogeneous crystals has been the subject of extensive theoretical and computational studies. It has been suggested that Born stability conditions are only valid for the analysis of an unstressed lattice. The generalization of the elastic stability criteria to the non-zero stress case can b…
Reaction and sintering characteristics of mixtures of kaolin (Al2O3⋅2SiO2⋅2H2O) with BaCO3 or SrCO3 were investigated using kaolin and finely ground carbonate powders. Although the decomposition temperature of barium carbonate and strontium carbonate are higher than 1050°C, both carbonate powders decomposed at much lo…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Natasa Čegar, Ferenc Simon, Gabriel Baumgartner, Andrzej Sienkiewicz, László Forró, Barbara Ruzic…
SnO2 samples doped with x-mol % Mn (x = 0, 0.3, 0.5, 0.7, 1.0) were prepared by organic route, calcined at 800 C for 4h, and characterized by the Rietveld method with X-ray diffraction data. The Thompson-Cox-Hastings pseudo-Voigt profile function was used as it is in the DBWS 9411 Rietveld analysis software. For the F…
Low temperature superplasticity (LTSP) was observed in the 5083 Al–Mg base alloy after thermomechanical treatments (TMT). The maximum LTSP elongation was 400%, occurring at 250°C and 1×10−3 s−1. The subgrain structures formed during TMT transformed to better defined subgrains to ∼0.5 μm upon heating to 250°C. Further…