Materials Literature
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The temperature dependence of the room pressure Raman spectra of the GeO 2 (hexagonal and tetragonal) and SiO 2 (quartz, coesite, and stishovite) polymorphs is presented. Several transformations upon heating are reported: α‐β quartz, coesite‐cristobalite, stishovite‐silica glass (with Si in four‐fold coordination). Fo…
Abstract Surface properties of fluoroalkylsilicone—poly(methyl methacrylate) block copolymers and their poly(methyl methacrylate) (PMMA) blends have been intensively studied to draw a relationship between surface segregation behavior and adhesion performance. The fluoroalkylsilicone—PMMA block copolymers containing th…
Abstract The charge transfer (CT) interactions between polyemeraldine (PEM) and six organic electron acceptors were studied. The complexing ability of the acceptors, based on the maximum attainable electrical conductivity of the resulting complex, could be arranged in the following ascending order:tetrachloro‐ p ‐benz…
Abstract The zone‐drawing method has been applied to prepare ultra‐high modulus polyvinyl alcohol fibers. First, the suitable temperature for zone‐drawing was decided. In the first zone drawing, when drawing temperature was as high as near melting point, the highest draw ratio and modulus were obtained. The modulus wa…
Abstract The thermal degradation of polystyrene (PS) in various kinds of solvents was studied in the temperature range from 300 to 450°C. The conversion of PS to low molecular weight products was dependent on the hydrogen donating ability of the solvents used: Solvents with greater donating ability resulted in less co…
Abstract The effect of a remote nitrogen plasma on polyethylene and polystyrene was studied. The gas flow rate, the dilution of reactant gas, exposure times, and reactor base pressure were all found to have a large impact on the efficiency of nitrogen incorporation. Optimum conditions caused 18 atom % nitrogen to be i…
High dielectric constant SrTiO3 thin films were sputter deposited on barrier layers/Si substrate to fabricate a capacitor for dynamic random access memories. Dielectric constant (εr) values of 140–210 were achieved for the 150-nm-thick SrTiO3 films using a Pt/Ti or Pt/Ta double-layer barrier. In the Pt(50 nm)/Ti(10 nm…
Molecular-dynamics simulations of highly nonspherical rodlike and platelike molecules reveal that one of the two diffusion coefficients in the nematic-liquid-crystal phase increases with density, reaches a maximum, and decreases, while the other coefficient decreases monotonically in the usual way. This effect seems t…
The authors describe the application of the reverse Monte Carlo simulation technique to the analysis of EXAFS data. This technique generates a series of three dimensional particle configurations which are consistent with the experimental EXAFS spectrum. No input information other than the density and the chemical comp…
A brief review is given for the Brillouin scattering studies of the dependence of the acoustic anomaly on the direction of sound propagation in structural phase transitions in ferroelectric and ferroelastic crystals. Near the ferroelectric phase transition temperature, the polarization fluctuation shows a characterist…
Abstract The reaction of (NH 4 ) 2 [Ce(NO 3 ) 6 ] with two equivalents of OPPh 3 (Ph = C 6 H 5 ) in acetonitrile yields Ce(NO 3 ) 4 (OPPh 3 ) 2 (1) in high yield, whereas using acetone as solvent affords mer- Ce(NO 3 ) 3 (OPPh 3 ) 3 • 2(CH 3 ) 2 CO (2), the yield of which is dependent on the reaction time. A crystal s…
Since early 1980's, JAERI and DOE (LANL) have collaborated on developments of tritium technology for fusion reactors. About ten years collaboration, specially under the Annex III and IV agreements, has produced many remarkable outcomes on tritium fuel processing and tritium safety handling technologies. Under the Anne…
We present, in this paper, a lattice model of liquid-crystalline polymers with rigid groups attached to a semiflexible main chain through semiflexible spacers. The polymers are modeled as sequences of isodiametric units allocated at the nodes of the face-centered-cubic lattice. The model allows study of the phase beha…
Article Generalized susceptibility of dislocations in ferroelectrics and ferromagnetics was published on December 1, 1990 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 193, issue 1-4).
Abstract A new X-ray powder diffraction pattern for α -Si 3 N 4 is presented and compared with the current PDF pattern. The necessity for an updated pattern is discussed.
In our program for ion beam polishing of microwave-assisted chemical vapor deposited diamond films using a planarizing layer we have sought to develop the technique by polishing AT-cut quartz disks used in rate monitors as an intermediate objective. Using an argon ion beam and spin-coated photoresist as the planarizin…
Abstract Growth of the habit of a single seed and the special growth of splicing “parallel” seeds were investigated and compared with. Chemical etching and X‐ray topography were used to characterize spliced KDP crystals. The kinetic data in different growth stages were measured. It is concluded that secondary capping…
Das leicht zugängliche Tetrabrom[2.2]paracyclophan läßt sich mit Kalium‐ tert ‐butylalkoholat in Tetrahydrofuran schrittweise vierfach dehydrobromieren. Die dabei gebildeten [2.2]Paracyclophanine werden von Furan, Diphenylisobenzofuran und Tetraphenylcyclopentadienon zu entsprechenden Cycloaddukten effizient abgefange…
Guinier x-ray powder diffraction data in the temperature range from T=10 to 290 K, and heat capacity measurements from T=40 to 280 K indicate three phases for K2SeBr6. The high-temperature cubic structure [K2PtCl6 -type, space group Fm3̄m; a=10.4211(7) Å at T=290 K] transforms at 237.8±0.3 K with ΔStr=(1.36±0.02) J K−…
The mean velocity of nylon spheres transported in a horizontal water pipe A M Binnie and T-C Kuo - Manipulation and welding of metal spheres above 10 m using needle-like probe Takeshi Konno, Mikihiko