Materials Literature
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Hole trapping in thermally grown silicon-dioxide films has been studied using optically induced hot-hole injection in p-channel polysilicon-SiO2-silicon field-effect-transistor structures. Analysis of the data assuming a uniform trap distribution and no detrapping gives 3.1×10−13 cm2 and 1.4×1018 cm−3 for the capture…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrosylmetalloporphyrins. III. Synthesis and molecular stereochemistry of nitrosyl-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinato(1-methylimidazole)iron(II)W. Robert Scheidt and Paul L. PiciuloCite this: J. Am. Chem. Soc. 1976, 98, 7, 1913–1919Publication Date (Print)…
New measurements of the optical spectrum of trivalent neodymium in a hexagonal lanthanum chloride host have been made at 4 and 77 K at wavelengths down to 2500 Å (40 000 cm−1). Crystal quantum number assignments for new energy levels were derived from these results and for most of the earlier levels not already classi…
One of the important problems in the development of ac plasma panels is to produce panels that maintain stable characteristics for a long time. A new idea for using a protecting layer over the dielectric layer which isolates the electrodes from the gas was examined and good results were obtained. Moreover, besides sta…
The analysis of Rapini and Papoular for homeotropic and homogeneous geometries is extended to predict the effects of weak boundary coupling on liquid-crystal display performance. An implicit expression for deformation as a function of applied field is derived for the case of equal elastic constants. Steeper transition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of the Cure of Poly(p-phenylene sulfide)Richard T. HawkinsCite this: Macromolecules 1976, 9, 2, 189–194Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976https://pubs.acs.org/doi/10.1021/ma60050a001http…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyurethane Interpenetrating Polymer Networks. I. Synthesis and Morphology of Polyurethane-Poly(methyl methacrylate) Interpenetrating Polymer NetworksS. C. Kim, D. Klempner, K. S. Frisch, W. Radigan, and H. L. FrischCite this: Macromolecules 1976, 9, 2, 258–263Publication D…
No abstract available.
The 'transition' state in binary f.c.c. based systems is assumed to be characterized by the repetition of interpenetrating polyhedral clusters of atoms occupying lattice sites and having the macroscopic composition. Its mathematical formulation leads to relations between the short-range order (SRO) coefficients, which…
Summary The equilibria as well as the rates of adsorption and desorption of the ions Pb 2+ , Cu 2+ , Cd 2+ , Zn 2+ , and Ca 2+ by soil organic matter were determined in batch experiments as a function of the amount of metal ions added to an aqueous suspension of HCl‐washed peat. Simultaneous determination of the metal…
The withstand strength of contaminated insulators under practical field conditions depends on the type and distribution of contaminants as well as their conductivity. In this paper, the authors have investigated the dependence of flashover voltage on the chemical composition of multicomponent contaminants and have pro…
Mossbauer spectra on 57Fe and 119Sn in perovskite carbides with formula M3M'C (where M is Fe or Mn, and M', Al, Ga, Ge, Zn, Sn) have been observed. All those compounds are characterized by a large quadrupole coupling amounting to 1.3 mm s-1 and by low internal magnetic fields, around 70 kOe, at M atom. The effect of c…
The changes of the elastic shear moduli C 44 and C'=(C 11 -C 12 )/2 have been measured after electron irradiation of aluminium at 4.5K. Aside from dislocation pinning, a diaelastic effect which is proportional to the radiation-induced defect density has been observed. From these data the diaelastic polarizabilities un…
The paper describes analytical and experimental results for a new method of current harmonic reduction in thyristor converters. The principle of the method is to modify the current waveforms on the d.c. windings of the converter transformer by injecting harmonic currents at a particular frequency. In practice, third h…
Abstract The elongation and orientation of randomly coiled macromolecules in a strained melt or solution reduces their entropy and thus increases the crystallization or melting temperature of the ideal lattice. At any given temperature of experiment this enhances nucleation and crystal growth rate. As a rule, linear p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Class of Synthetic Polyelectrolytes. Acidic Polyesters of Phosphoric Acid (Poly(hydroxyalkylene phosphates))K. Kaluzynski, J. Libisowski, and St. PenczekCite this: Macromolecules 1976, 9, 2, 365–367Publication Date (Print):March 1, 1976Publication History Published onl…
The formation of TiO 2 powders by oxygenolysis of TiCI 4 was studied with emphasis on the effects of reaction conditions on the particle size of the products. The particle size of TiO 2 (anatase) decreased with increasing reaction temperature or O 2 concentration and with decreasing TiCI 4 concentration. The results a…
An experimental investigation of the effect of chromium oxide coatings upon the surface flashover of high-density alumina in vacuum is reported. It is shown that such coatings improve the withstand voltage for dc, 60-Hz, and impulse voltages by significant amounts. The coatings are simply applied, effective, and durab…
The luminescence spectrum of MgO:${\mathrm{Cr}}^{3+}$ is characterized by a series of sharp features at around 7000 \AA{} and a broad band which stretches from about 7000 \AA{} to 1 \ensuremath{\mu}m. The nature of the centers responsible for this broadband luminescence is examined by a combination of phase-sensitive…
Abstract The crystal structure of form III of isotactic poly‐1‐butene, (poly(1‐ethylethylene)), has been determined by X‐ray powder diffraction techniques, owing to the impossibility of obtaining fiber spectra on this form. The polymer crystallizes in the orthorhombic system, with lattice dimensions: a = 12,38±0,08 Å;…