Materials Literature
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The diffusion of As in polycrystalline silicon films subjected to rapid thermal annealing has been studied using sheet resistance and Rutherford backscattering. The polycrystalline Si films were deposited on oxidized silicon wafers, implanted with As, and annealed with a Varian IA-200 isothermal annealer. Infrared rad…
Soft-x-ray emission ($K\ensuremath{\beta}$ emission) and absorption ($K$ absorption) spectra of a black P single crystal polarized along each crystalline axis are presented for the first time. The experimental results indicate (1) the upper part of the valence band near the Fermi level is largely contributed by the $3…
The electron density distribution in Fe–phthalocyanine is mapped using a set of accurate diffraction data collected at 110 K. Structural results are in agreement with an earlier room-temperature determination. Deformation electron density maps show a deficiency of the Fe electron density along the axis perpendicular t…
The character of the first unoccupied band in the graphite intercalation compound ${\mathrm{LiC}}_{6}$ is examined. Based on a framework of interacting nonorthogonal states, an analysis of previous band-structure results shows that this band can be interpreted as a hybrid of Li $2s$ and graphite interlayer states.
The temperature dependence of the birefringence and magnetic field induced effects were studied on thin films of mixtures of potassium laurate, 1-decanol, and D2O. The selected mixtures have a small biaxial nematic range between two uniaxial nematics. The biaxial–uniaxial nematic phase transitions are second order and…
Reflectivity measurements in the far-infrared region irrefutably show the consequence of the Peierls instability in the blue bronze ${\mathrm{K}}_{0.3}$${\mathrm{MoO}}_{3}$ system. At 5 K, a very strong polarization-dependent phonon spectrum is observed: At photon energies below 8 meV, a giant, nearly undamped structu…
Measurements of the frequency, temperature, and isotope-mass dependence of the electrical conductivity in a series of ${(^{6}\mathrm{Li},\phantom{\rule{0ex}{0ex}}^{7}\mathrm{Li})}_{2}$ O:2.${88\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ glasses are quantitatively described by a unified model of relaxation. The data simultaneou…
Room-temperature values of the thermal conductivity ($\ensuremath{\kappa}$) of pure and heavily doped polyacetylene, both cis and trans isomers, have been experimentally determined using a new experimental approach for the determination of $\ensuremath{\kappa}$ along the plane of the sample. We find that effects of ra…
The nearest-neighbor distances around Te atoms in the random semiconducting alloy ${\mathrm{Cd}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Te}$ have been determined by the extended x-ray-absorption fine-structure technique. The distribution of the anion-cation distances is bimodal. A model of the microscopic structur…
Franco et al. has shown the inhibi tion of ferroelectric swi tching I when TGS crystals are treated during 1000 hours with an electric potential.In order to determine whether the inhibition may be explained in terms of the structure, we have determined the crystal structure of a swi tehing fatigued crystal.The results…
possible errors in the input data.A systematic survey of structures in the Inorganic Crystal Structure Database shows that the program can provide a proper description of the chemical bonding for about 90%
scaLLering faeLor of Pb and Bi aLom aL sinBIA = 0.0 is enlarged La 3.2.A seL of 237 inLensiLy of hkO refleclions(including 37 sLandard reflections) was collected with the .CJ~28 step scan mode, using a four-circle diffractomeLer seL up aL Lhe BL-IOA sLation.AfLer correction of dead time of detector system, Lorentz fac…
Abstract Certain ternary metal oxides release oxygen at their surfaces when they function as catalysts for the selective oxidation of hydrocarbons. In so doing, they become non-stoichiometric, often quite markedly so (up to x = 0.5 in AMO3-x). In perovskite related phases of this kind, oxygen from the gas phase is rea…
Abstract Flexural stress relaxations were measured for rigid polyurethane foams (PUF) and glass‐fiber‐reinforced rigid polyurethane foams (FRU). The results were successfully analyzed in terms of the five element Maxwell model: (1) Samples reinforced with longer fibers exhibit reduced stress relaxation and reduced tem…
Several new fluorene derivatives have been synthesized and their liquid crystalline polymorphic behavior examined. Specifically, 2-fluorenylmethylidene-4′-n-alkylanilines with different alkyl groups are compared with corresponding compounds wherein the alkyl groups have been replaced either by the alkoxy or other diff…
Abstract The molar mass distribution of polyethylenes synthesized at pressures up to 2500 bar and temperatures to 255°C with thermal and partly with photochemical initiation is determined by GPC. In the limiting situation of high pressure, low temperature, and small conversion a distribution function based on a limite…
Transformation range viscosity was measured for multicomponent fluorozirconate glasses in the system 0.56ZrF 4 ·(0.34‐x)BaF 2 ·0.06LaF 3 ·0.04AlF 3 ·xRF, where R =Li, Na, K, or Cs . The results indicate that the viscosity of these glasses can be described by an Arrhenius equation over the viscosity range from 10 7 to…
Article Ungewöhnliche lineare, oligomere Anionen [GanSe2n+2](n + 4)- (n =2,4,6) in festen Selenogallaten des Cäsiums was published on August 1, 1984 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 166, issue 1-4).
Abstract An investigation was made into the effect of coupling agents on the rheological behavior and processability of polypropylene. For the study, each of the following three commercially available coupling agents, a titanate coupling agent (Kenrich Petrochemicals, KR‐TTS) and two silane coupling agents (Union Carb…
Abstract Das neue Oxid Na 4 SnO 3 (hellgelbe, klare Einkristalle) aus: 1. NaO 0,45 und SnO (Na:Sn 2+ = 4,1:1; Ag‐Bömbchen; 600 bis 730°C, 7 bis 66 d); 2. NaO 0,45 , SnO 2 und Sn ±0 (Na:Sn 4+ : Sn ±0 = 8,2:1:1; Ag‐Bömbchen; 650 bis 680°C, 2 bis 66 d); 3. NaO 0,45 , Na 2 SnO 3 und Sn ±0 (Na: Na 2 SnO 3 : Sn ±0 = 6,1:1:1…