Materials Literature
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The $c$-axis charge distribution in higher-stage potassium graphite has been obtained from an analysis of carbon $1s$ core-electron binding-energy spectra. The highly localized distribution of transferred charge in the bounding layer effectively screens the positive intercalant ions. The interior layers are thus graph…
An intrinsic room-temperature coercivity of 7.45 kOe has been found in melt-spun Nd0.4Fe0.6; this value is the largest ever reported for a rare-earth–iron alloy. A significant correlation was found between quench rate and coercivitiy, suggesting that the quenched alloys consist of fine crystallites or clusters, whose…
The crystal structure of (Et 3 NH) 2 SnCl 6 at room temperature consists of a monoclinically distorted antifluorite packing of Et 3 NH + and SnCl 6 2− ions. Each anion has two cations centrosymmetrically associated with it through bifurcated hydrogen bonds to four of the Cl atoms, leaving two of the six chlorines unen…
Chemiluminescence has been observed in the single collision reaction of boron atoms with O2, SO2, N2O, NO2, and H2O2. The experiments were performed in a beam-gas apparatus using photon counting to detect the optical signals. The electronically excited A 2π state of BO was observed in all the reactions. In addition, t…
JV-Acetyl-L-cysteine, C5H9N03S,Afr= 163-20,crystallizes in the space group PI, with a = 5-766 (1), b = 6-433 (1), c = 5-014(1) A, a= 102-80(2), /} = 102-77 (1), y = 95-81 (1), Z = 1 and final R^F 7 ) = 0-024 for a total of 1232 independent reflections, at T -16 K. The structure was first deduced from * Structure and C…
A theory of hydrogen absorption by metal hydrides is formulated in the mean-field approximation. The distinction between the true saturation and an incipient saturation is emphasized. It is shown that the incipient saturation is a manifestation of the effect of $d$-band structure upon the absorption of hydrogen. Absor…
As a model for a crystal with displacive modulation a classical linear chain is discussed with up to third-neighbor interaction. This system has an infinite number of stable equilibrium configurations separated by high barriers. It has a zero-frequency phonon mode, a low-lying phason branch, and an amplitude mode.
The valence- and core-electron spectra have been investigated for a series of ${\mathrm{Cu}}_{x}{\mathrm{Pd}}_{1\ensuremath{-}x}$ alloys by means of ESCA (electron spectroscopy for chemical analysis). In the dilute limits a subtraction method is applied to derive the contribution of the low-concentration components to…
The electrical-resistance behavior of Ca is studied from 2 to 300 K at various pressures up to 440 kbar using a clamp-type sintered diamond-tipped opposed-anvil apparatus. It is found that the electrical resistance of Ca at room temperature increases monotonically as a function of pressure and reaches a maximum at abo…
We report measurements of the electrical resistivity, Hall coefficient, magnetoresistance, thermoelectric power, infrared reflectivity, and $c$-axis lattice parameter of single crystals of titanium disulfide ${\mathrm{Ti}}_{1+x}{\mathrm{S}}_{2}$ with varying degrees of nonstoichiometry. The strong correlations we find…
Poly(p-phenylene) sulfide, poly(m-phenylene) sulfide, and the newly synthesized polymer poly(thio-2,8-dibenzothiophenediyl) have been treated with strong electron acceptors (AsF5, SbF5) to form conducting complexes with p-type electronic conductivities up to 3 S/cm. Near IR to UV absorption spectra and temperature-dep…
Equations are derived and calculations are presented for the electrodynamic mechanism of enhanced Raman scattering by molecules at the surface of prolate and oblate spheroids in the small-particle limit. The molecules may be arbitrarily distributed; the particles may be arbitrarily oriented. Calculations are presented…
Recent experiments involving the propagation of extremely high frequency, short-wavelength acoustic phonons in semiconductors are described. Such phonons, which play an important role in thermal energy transpor and nonradiative recombination processes, can be used as sensitive microscopic probes of electronic, defect,…
There are significant differences in the field dependence of conductivity in low-density polyethylene as reported by various investigators. These differences are attributable partly to the presence of different kinds of impurities in variable concentrations in polyethylene samples of various origin, but are mainly due…
When crystals of Cs 2 CdCl 4 (K 2 NiF 4 -type structure) are doped with Cr 3+ a number of different impurity centres are formed which are readily distinguishable by EPR spectroscopy. The doped crystals contain both compensated and uncompensated Cr 3+ centres. The resonances from the uncompensated Cr 3+ exhibit axial s…
Internal friction, ultrasonic attenuation, and electric modulus measurements on $\ensuremath{\beta}$- alumina, which are inconsistent with simple Debye theory, are found to be in good agreement with each other when analyzed with use of the "universal" dielectric response theory. It is suggested that this theory may be…
Polystyrene spheres (diameter approximately 3000 AA) trapped at the air-water interface and interacting via dipole-dipole repulsion have been seen to form a two-dimensional triangular lattice. The authors report the first molecular dynamics study of such an interfacial colloidal crystal. It is shown that the system un…
Polycrystalline calcite was revealed by scanning electron microscopy of fractured skeletal ossicles of the sea star Echinaster spinulosus (Echinodermata, Asteroidea). Whisker-like calcite crystals were observed in specimens that were loaded in stress relaxation before being fractured; rapidly broken surfaces were smoo…
Abstract A low temperature solution condensation method with pyridine as acceptor‐catalytic reagent was applied to the synthesis of polyarylates from carbazole and bisphenol A/phenolphthalein. The polyarylates were classified with respect to their structure, thermal stability, and dielectric behavior.
An electrolytic plutonium decontamination process for stainless steel was developed for use as the final step in a proposed radioactive waste handling and decontamination facility to be constructed at the Rockwell International Rocky Flats plutonium handling facility. The process utilizes a basic (pH > 7) electrolyte…