Materials Literature
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Select mechanical, thermal, and rheological properties of star-blocks consisting of 5–21 polystyrene-b-polyisobutylene (PSt-b-PIB) arms radiating from cyclosiloxane cores are described. The tensile properties of products containing 23–41 wt % of PSt are substantially higher (9.6–23.8 MPa) than those of linear triblock…
Boron nitride thin films were deposited at room temperature with various ion energies by mass selected ion beam deposition on cubic boron nitride (c-BN) previously nucleated on Si (100) substrates at a higher temperature. Selective area diffraction, electron energy loss, and infrared spectroscopy results reveal contin…
The critical behavior in the vicinity of antiferromagnetic instability has been investigated for the filling-controlled insulator-metal transition system, ${\mathrm{LaTiO}}_{3+\ensuremath{\delta}/2},$ by transport and specific heat measurements. With the increase of nominal hole doping $\ensuremath{\delta},$ the syste…
Biaxially oriented nonlinear dielectric Ba0.6Sr0.4TiO3 (BST) films have been grown on polycrystalline ferrite yttrium iron garnet (YIG) substrates. We use a structurally and chemically compatible MgO buffer to improve the crystallinity of the BST on polycrystalline YIG substrates, where the biaxially oriented MgO is d…
Microelectronic circuits often fail because of voids and cracks that cause open circuits in their interconnects. The voids form due to severe thermal stresses and high current densities present in the lines during service. Typical interconnect lines contain large numbers of voids which gradually grow and change their…
We have developed a simple fabrication process which allows the production of nanoscale silicon structures. Rough silver films are used as an etching mask for reactive ion etching at 10 °C. Variation of the etching parameters, such as the rf power, allows control over the shape of the features; the production of both…
PbZr 0.2 Ti 0.8 O 3 (PZT) thin films with and without La0.5Sr0.5CoO3(LSCO) electrodes were grown epitaxially on (001) SrTiO3 at 650 °C by pulsed laser deposition. The domain structure of the 400 nm thick PZT films with different electrode layer configurations was investigated by x-ray diffraction and transmission elec…
To understand the mechanism of electron field emission from diamond-like carbon, tetrahedral amorphous carbon (ta-C) films were subjected to Ar, H2, and O2 plasma treatments to change their surface condition and were deposited on substrates of different work function. The threshold fields and current densities for und…
Information on the crystalline structure and the properties of poly(butylene-2,6-naphthalene dicarboxylate) (PBN) has not been well reported until now, but it is known that there are two different crystal modifications in PBN, as follows: one is formed in isotropic samples by annealing (α form); another appears by ann…
Based on the Langevin equations for cations and anions in a molten salt, the ionic partial conductivities are discussed in connection with their masses. These partial conductivities are shown in terms of current-current correlation functions as an extension of Kubo theory. And these partial conductivities are also des…
A single crystal of Pb 9.85 (VO 4 ) 6 I 1.7 was grown at 1073 K from a mixture of lead vanadate and lead iodide. The structure is of the apatite type with a deficiency of lead iodide. The Pb atom is distributed equally in sites I and II of apatite. The Pb 2+ lone pair induces displacements of the Pb, O and I atoms out…
Photoluminescence (PL) decay dynamics of Ge nanocrystals (nc-Ge) 1.2–3.2 nm in average diameter embedded in SiO2 matrices was studied. The samples showed a PL peak in the near-infrared region with strong size dependence. A very fast component (≪1 μs) was found in decay curves for all the samples. For the samples conta…
Temperature rising elution fractionation (TREF) fractionates polymer chains with respect to their crystallizability, independently of molecular weight effects. In order to achieve a good fractionation, TREF requires a time-consuming polymer deposition step over an inert support before the elution step. A single-step c…
Polycrystalline samples of GeBi4Te7 with different compositional deviations from stoichiometry have been prepared and characterized by Seebeck coefficient and electrical resistivity measurements over the temperature range 100–750 K. At room temperature all samples exhibit n-type conductivity and a high concentration o…
SecA, the translocation ATPase of the preprotein translocase, accounts for 0.25% of the total protein in a degU32(Hy) Bacillus subtilis strain in logarithmic phase. The SecA level remained constant irrespective of the demand for exoprotein production but dropped about 12-fold during the late stationary phase. Modulati…
Temperature variation of reflectivity spectra (0.6--5.0 eV) has been investigated for ferromagnetic ${\mathrm{CoS}}_{2}.$ We have found significant spectral changes at the ferromagnetic transition ${(T}_{\mathrm{C}}=120\mathrm{}\mathrm{K}):$ (1) oscillator strength of the lower-lying interband transition $(\ensuremath…
We have investigated magnetization, neutron scattering, resistivity, thermoelectric power and Hall effect in LaCo 1- x Ni x O 3 ( x =0.05 and 0.1) single crystals. At low temperatures, they show spin-glass behavior with a strong ferromagnetic correlation. Around 500 K, spin state transition from the intermediate spin…
The normal way to calculate the Peierls energy for dislocations follows the procedure of Peierls and Nabarro, who summed the atomic misfit energy in the glide plane at the position of the atoms. Since the misfit energy is not localized but rather contained in the electron distribution, some averaging must be made. Thi…
We have studied the electronic structure of ${\mathrm{Y}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{VO}}_{3}$ by x-ray-absorption and resonant photoemission spectroscopy. Upon hole doping the parent Mott-Hubbard insulator ${\mathrm{YVO}}_{3},$ an insulator-metal transition occurs at around $x\ensuremath{\approx}0.5.…
The genetic algorithm approach, in which a population of trial structures is allowed to evolve subject to well-defined procedures for mating, mutation, and natural selection, was employed to solve the complex molecular crystal structure of Ph2P(O)(CH2)7P(O)Ph2 directly from powder diffraction data. The structure solut…