Materials Literature
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The dead-end radical copolymerization of 1,1-difluoroethylene (or vinylidene fluoride, VDF or VF 2 ) with hexafluoropropene (HFP) initiated by hydrogen peroxide for obtaining original fluorinated telechelic elastomers is presented. The influence of the process (solution or emulsion) and the nature and amounts of solve…
Highly ordered uniform ZnTe nanohole arrays were successfully fabricated by reactive ion etching using anodic alumina template. These ZnTe nanohole arrays transferred exactly the hexagonal lattice pattern of the original alumina template. Using this method ordered ZnTe nanoholes with pore diameter from 10 nm to severa…
We present neutron diffraction data of NiO nanoparticles measuring the total magnetization and the sublattice magnetization at various temperatures. Electron microscopy shows that the particles are disc shaped with average diameter of about 12 nm and a thickness of about 2 nm. The Néel temperature (≈ K) is less than f…
On trouve la nabesite dans des venues complexes d'albitites a tugtupite sur le plateau de Kvanefjeld, a l'extreme nord-ouest du complexe alcalin d'Ilimaussaq, dans le sud du Groenland, Elle se presente en cavites, revouverte de cristaux d'albite, en association avec gmelinite, neptunite, analcime, gonnardite, lovdarit…
The influence of metal ion interaction with crowned spirobenzopyrans on the photoisomerization behavior was investigated through the use of various solvents, crowned spirobenzopyrans, and metal ions. Studies on the photoisomerization behavior of crowned spirobenzopyrans in various solvents revealed that solvation of t…
The oxidation kinetics of hot‐pressed Mo(Al 0.01 Si 0.99 ) 2 and Mo(Al 0.1 Si 0.9 ) 2 were measured at 480°C, and between 1200° and 1600°C. The qualitative oxidation of arc‐melted Mo(Al 0.1 Si 0.9 ) 2 , Mo(Al 0.3 Si 0.7 ) 2 , Mo(Al 0.5 Si 0.5 ) 2 , and Mo 3 Al 8 was examined after 600°C for 1000 h in air. At all tempe…
Summary Single crystals of zircon doped with 239 Pu, up to 2 mm in size, were grown for the first time ever, using a Li-Mo flux. The crystals were transparent and free of inclusions of separated Pu phases. The zircon crystals were studied using optical and scanning electron microscopy, the electron microprobe, and cat…
A GaN-based blue diode laser is employed for laser absorption spectroscopy in an aluminum hollow cathode glow discharge plasma. A Littrow grating stabilized external resonator is used for tuning the wavelength of laser emission. Scanning the wavelength of the laser probes the absorption profile of aluminum transitions…
Experimental results are reported which show a strong evidence of energy transfer between Ho3+ ions in a fluoroindate glass excited by a pulsed laser operating at 640 nm. We identified the origin of the blue and green upconverted fluorescence observed as being due to a Ho3+–Ho3+ pair interaction process. The dynamics…
We realized what we believe is a new phase-shifting scatterplate interferometer by exploiting the polarization characteristics of a birefringent scatterplate. The common-path design of the interferometer reduces its sensitivity to environmental effects, and phase shifting allows quick and accurate quantitative measure…
The synthesis, characterization, and mesomorphic properties of a new type of heteronuclear compounds derived from pyrimidine as core group are reported. These compounds were prepared by condensation reactions of appropriate acetophenones and benzonitriles in the presence of trifluoromethanesulphonic anhydride. They we…
Although it has been well accepted that F-Al linkages dominate in F-bearing alkali aluminosilicate glasses, the possibility of F-Si linkages remains unresolved. Recent 19 F NMR results have been interpreted as indicative of not only the presence of the Al-F-Na(n) linkages but also of the presence of Si-F-Na(n) linkage…
The mechanism of the carbon nanotube (CNT) formation and its graphitization has not been well understood and is still under controversy. The authors have been studying a new process to form CNTs, where polyyne-containing carbons are heated and irradiated by an electron beam in a transmission electron microscope (TEM).…
Strong electroluminescence was observed in a CdTe nanoparticle light-emitting diode that was fabricated by layer-by-layer assembly of poly(p-phenylenevinylene) and CdTe nanoparticles. The turn-on voltage for the electroluminescence is 4.0 V. The electroluminescence is exclusively from CdTe nanoparticles, with a 30 nm…
Multiphonon Raman scattering in semiconductor nanocrystals is treated taking into account both adiabatic and nonadiabatic phonon-assisted optical transitions. Because phonons of various symmetries are involved in scattering processes, there is a considerable enhancement of intensities of multiphonon peaks in nanocryst…
The relation between electrical and structural properties of indium tin oxide (ITO) films prepared by pulsed laser deposition with and without in situ laser irradiation is examined. The residual stresses of the films were estimated from x-ray diffraction patterns measured by grazing-incidence asymmetric Bragg and graz…
Amorphous silicon nanocolumns, square nanospirals, and multilayer spiral/column rods are fabricated on bare Si substrates and monolayer colloid substrates by glancing angle deposition. The grown films are studied by scanning electron microscopy and transmission electron microscopy. The size of the deposited Si columns…
The different magnetic and crystallographic structures in the series of ${\mathrm{Tb}}_{5}({\mathrm{Si}}_{x}{\mathrm{Ge}}_{1\ensuremath{-}x}{)}_{4}$ compounds have been studied by means of macroscopic (ac magnetic susceptibility, linear thermal expansion, and resistivity) and microscopic neutron powder diffraction exp…
The optical constants and dielectric functions of a series of samples of glassy carbon subjected to a heat treatment from 1000°C to 3000°C have been evaluated in the spectral region of 1.5–13.8 eV. In the region of 1.5–5.0 eV the method of spectroscopic ellipsometry and multiangle reflectivity with p-polarized light w…
The transmission and reflection of light are considered in the case of its normal incidence on a layer of a periodically nonuniform medium possessing dielectric and magnetic helicities, with the axes of electrical and magnetic permittivities being rotated relative to each other. A simple algorithm for constructing the…