Materials Literature
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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
A microstructure based magnetization reversal model is presented for sintered Fe-Nd-B magnets. The model makes use of a position dependent domain wall energy profile to correlate the intrinsic coercivity, iHc (and the nucleation field) to the magnetocrystalline anisotropy field. The inferences of the model are verifie…
Abstract The spontaneous and face‐specific copolymerization of [l.l.l]propellane and maleic anhydride to give the strictly alternating 1:1 copolymer 2 is described. The molecular weight of 2 after transformation into the corresponding diester 5c was determined to be 80.000 (M n ) and 220.000 (M w ), respectively.
Abstract Electron scatterings in the volume and at the surface of a solid are simulated by the Monte Carlo method. The effect on the electron distributions is demonstrated in some typical cases: aluminium, copper and gold covered with a carbonaceous layer.
Abstract Seit einigen Jahren wird versucht, die Synchrotronstrahlung, die eine intensive Röntgenquelle mit hervorragenden Polarisationseigenschaften darstellt, auch zur Untersuchung magnetischer Strukturen zu nutzen. Mit zirkular polarisierter Röntgenstrahlung als Sonde liefert hierzu die spinabhängige Absorptionsspek…
Isocitrate lyase was purified from Phycomyces blakesleeanus N.R.R.L. 1555(-). The native enzyme has an Mr of 240,000. The enzyme appeared to be a tetramer with apparently identical subunits of Mr 62,000. The enzyme requires Mg2+ for activity, and the data suggest that the Mg2(+)-isocitrate complex is the true substrat…
Consider a system of N hard spheres of radii d i > 0 and masses m i < 0, i = 1,…, N. The spheres may interact through elastic pair collisions but move freely otherwise in all of R3. It is shown that (with the exception of a set of initial states of measure zero) there are at most finitely many collisions for any given…