Materials Literature
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Abstract Uni-modal and bi-modal microstructures were concurrently observed in a TiO 2 -doped -Al 2 O 3 ceramic material with some SiO 2 impurity. The segregation of Ti and Si to grain boundaries was systematically evaluated to reveal their role at the start of anisotropic grain growth. In general, in the bi-modal area…
A possible mechanism for the field emission spectroscopy (FES) peak energy shift observed for lightly nitrogen (N)-doped chemical vapor deposition (CVD) diamond was investigated using natural IIb diamond as a reference. Combined ultraviolet photoelectron spectroscopy/FES spectra of natural IIb diamond indicated that t…
Two kinds of Eu3+ COmplexes-Eu(TTA)3(TPPO)2 (TTA: thenoyltrifluoroacetone, TPPO: triphenylphosphineoxide) and Eu(BA)3(TPPO)2 (BA: 1-benzoylacetone)-were fully encapsulated, uniformly distributed into the channels of unmodified and modified SBA-15, and structurally characterized. The luminescent properties of the encap…
The alpha-MnO2 spherical assemblies were prepared via a facile hydrothermal approach in the presence of sodium dodecyl sulfate (SDS). The assembled nanostructures were composed of the MnO2 nanorods with 150-200 nm in width and several micrometers in length. The products were characterized by SEM, TEM and XRD. The elec…
Abstract Graft copolymerization by conventional radical polymerization leads to poor control in molecular weight and quite often gel formation because of several side reactions. In this investigation, PMMA was grafted on poly(epichlorohydrine-co-ethylene oxide) (ECO) elastomer by using ‘grafting from’ technique via at…
The alkaline earth tricyanomethanides Mg(tcm) 2 · 2H 2 O, Ca(tcm) 2 , Sr(tcm) 2 ・H 2 O and Ba(tcm) 2 · 2H 2 O were prepared from aqueous solutions of the respective chlorides and silver tricyanomethanide. Their IR spectra and thermal behavior are described. The crystal structures of Ca(tcm) 2 and Ba(tcm) 2 · 2H 2 O we…
We investigate the surface morphology and structure formations of nanocomposite polymer (polytetrafluoroethylene, polyurethane) coatings obtained by vacuum plasma method. We present data about the influence of coating composition and deposition conditions onto coating properties and structure.
Numerical calculations are performed for determining the polarization charge density a and residual donor concentrations in ZnO/ZnMgO heterostructures. The a value is determined to be 10 mC/m 2 for explaining the cathodoluminescence (CL) peak positions in narrow ZnO/ZnMgO multiple-quantum-well (MQW) structures (≤ 4 nm…
Low-resistance ohmic or Schotky contacts between diamond and metal is primary goal of electronic devices and microsystems based on diamond. The contact resistance depends not only on the choice of metals but also on annealing, layer thickness and other parameters. Combination of titanium, platinum and gold (with co-de…
The effect of temperature on the stability of synthetic ZnO crystals in neutral (N 2 ), oxidative (O 2 ), and reductive (95% Ar-5% H 2 ) media and in a low vacuum has been studied. In the first and second cases, zincite does not undergo changes up to 1000°C. After an 8-h exposure in oxygen at 1100°C, a decrease in the…
Y 3+ doping effect on magnetic properties of Ce 0.97 Co 0.03 O 2–δ are examined. Vibrating sample magnetometer (VSM) measurements indicate that Ce 0.97 Co 0.03 O 2–δ is ferromagnetic at room temperature. The saturated magnetization MS is altered by additional Y 3+ doping, i.e., with the increase of the amount of Y 3+…
Orthorhombic tungsten bronze PbKSmyNb2O6 (where x = 0.29 and y = 0.145) ceramic has been synthesized by the conventional sintering technique. Preliminary X-ray diffractogram analysis of crystal structure showed that a single phase compound has been formed with orthorhombic system. Frequency and temperature dependences…
Crystal and local structures (long- and short-range order, respectively) of four nanocrystalline zirconia-based solid solutions—ZrO 2 -6 and 16 mol % CaO and ZrO 2 -2.8 and 12 mol % Y 2 O 3 —synthesized by a pH-controlled nitrate-glycine gel-combustion process were studied. These materials were characterized by synchr…
A microestrutura e as propriedades magnéticas das ferritas Ni0,5-xCu xZn0,5Fe2O4 com x = 0,1/0,2/0,3/0,4 mol de cobre, preparadas a partir de pós obtidos por reação de combustão com tamanho de partícula na faixa de 23 a 29 nm, foram avaliadas. Os pós obtidos foram prensados uniaxialmente e sinterizadas a 1000 ºC/2 h.…
The configurations and conformations of twelve 5-imino-2,5-dihydrofuran-3-carboxamides and 5-imino-2,5-dihydrofuran-3-amines were determined by analysis of the experimental 13 C- 13 C coupling constants and those calculated by nonempirical methods, as well as by quantum-chemical calculations of the total energies and…
Abstract The usual damage on archaeological iron finds caused by corrosion are outlined in this paper. For a better understanding of these phenomena and the resulting consequences for iron conservation a short literature summary is given regarding actual corrosion models for archaeological iron finds. The desalination…
The results of structural neutron experiments on determining crystal and magnetic phase states of perovskite-like manganites R0.5Sr0.5MnO3 (R = 152Sm, Nd0.772Tb0.228, and Nd0.544Tb0.456) are reported. Experiments are carried out for revealing microscopic factors responsible for the giant oxygen isotope effect that was…
M2Y8(SiO4)6O2:Eu3+(M = Ca, Sr) nanophosphors were synthesized using sol-gel technology by adopting eight different kinds of silicon sources of novel crosslinging reagents. X-ray diffraction and scanning electronic microscopy show that these materials have sizes of 20-80 nm with different configurations due to the dive…
White light-emitting thin films containing Ln(3+)-doped NaYF4 nanoparticles were prepared by a simple spin-coating method. White light was generated by two different lanthanide ions, Er3+ (red and green) and Tm3+ (blue), by upconversion process under the excitation of a 980-nm laser diode. The ratio of the intensity o…
Two different methods for the preparation of starch-rich plastids are described together with protocols for the determination of plastid yield, purity, and intactness. The preparation of amyloplasts from maize endosperm and oilseed rape embryos are given as examples, but the protocols could be adapted for the isolatio…