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Abstract The tensile behavior of blends of linear polyethylene (PE) and isotactic polypropylene (PP) was examined in relation to their morphology. Yield stress increases monotonically with increasing PP content, while true ultimate strength is much lower in all blends than in the pure polymers as a result of early fra…
Following the structure analysis of uranocene, U(C{sub 8}H{sub 8}){sub 2}, we found to our surprise that almost nothing was known about the structure and bonding of organoactinides and lanthanides - a situation we have endeavored to change during the intervening years. The reported synthesis of uranocene in 1968 by Mu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoresponsive crown ethers. 1. Cis-trans isomerism of azobenzene as a tool to enforce conformational changes of crown ethers and polymersSeiji Shinkai, Takahiro Nakaji, Yoshihiro Nishida, Toshiyuki Ogawa, and Osamu ManabeCite this: J. Am. Chem. Soc. 1980, 102, 18, 5860–586…
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Abstract An analysis is given of the well‐known Moss formula connecting the energy gap to the refractive index of semiconductors. Based on Penn's model for the dielectric function of semiconductors and the treatment of Wemple, the refractive index is related to the energy gap. For small gaps, the relation is shown to…
The corrosion of iron in bicarbonate solutions has been investigated potentiostatically and by Auger electron spectroscopy. The dissolution of iron in the active and prepassive regions is greatly accelerated by the presence of bicarbonate, owing to the formation of the stable soluble complex anion Fe(CO3)22-. A mechan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA semiclassical treatment of electron-exchange reactions. Application to the hexaaquoiron(II)-hexaaquoiron(III) systemBruce S. Brunschwig, Jean Logan, Marshall D. Newton, and Norman SutinCite this: J. Am. Chem. Soc. 1980, 102, 18, 5798–5809Publication Date (Print):August 1,…
Approximate methods are used to calculate the growth of grain-boundary cavities by power-law creep, under multi axial stress states. The time to fracture at constant stress is given by t f =t n+ɑ/n+1)εss1n(1/(n+1)f i )where t n is the nucleation time (the time at which the voids first appear), εss is the steady-state…
In Pb(Sc0.5Ta0.5)O3 it has been shown that the degree of order in the B-site Sc3+, Ta5+ cations can be controlled by suitable thermal annealing. For samples which have been well-ordered by long annealing, dielectric measurements on single crystals show a normal first-order ferroelectric phase change at 13 °C and a max…
A new equation is derived for large amplitude forced radial oscillations of a bubble in an incident sound field. It includes the effects of acoustic radiation, as in Keller and Kolodner’s equation, and the effects of viscosity and surface tension, as in the modified Rayleigh equation due to Plesset, Noltingk and Neppi…
We assess various approximate forms for the correlation energy per particle of the spin-polarized homogeneous electron gas that have frequently been used in applications of the local spin density approximation to the exchange-correlation energy functional. By accurately recalculating the RPA correlation energy as a fu…
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High-pressure x-ray scattering studies of $2H$-Ta${\mathrm{Se}}_{2}$ reveal reentrant behavior of the charge-density-wave (CDW) lock-in transition. As pressure is increased the normal-to-incommensurate CDW transition changes less than 5 K; however, the lock-in transition, initially suppressed to $T\ensuremath{\rightar…
The infrared absorption from molecular monolayers is enhanced a factor of 20 by thin metal overlayers or underlayers with use of the attenuated-total-reflection technique. The total enhancement, including contributions from the attenuated-total-reflection geometry, is almost ${10}^{4}$. This effect is consistent with…
Dielectric constant (K), loss (tan δ), and conductivity (σ) of single crystals of PbI2 are measured (E ∥ c-axis) as a function of frequency in the range 102 to 107 Hz and at temperatures between 77 to 560 K. At room temperature (≈︁ 303 K), the K-value at 106 Hz is 6.7. The dielectric constant of this crystals increase…
The domain structure of the ferroelastic monoclinic phase of BiVO4 is examined by electron microscopy and electron diffraction methods. It consists of two orientation variants separated by two sets of quasi-mutually “perpendicular” walls. The orientation of the domain walls is not determined by symmetry but follows fr…
Cadmium–tin-oxide films with high conductivity and high visible transmission were prepared by dc reactive sputtering from a Cd-Sn alloy target in an Ar-O2 atmosphere. The electrical and optical properties of these films were found to depend strongly uponthe oxygen concentration in an Ar-O2 atmosphere during deposition…
The rotational motion of the ammonium ion in polycrystalline NH4Br has been investigated by quasielastic incoherent neutron scattering at 12 different temperatures between 297 and 409 K. The measured spectra were corrected for multiple scattering and compared to the C4-rotational jump model. The elastic incoherent str…
0.13 0.3224 (3) 0.2508 (3) 0.2405 (3) 0.38 0.1496(3) 0.1682(3) 0.1030(3) 0.13 0.0253 (3) 0.3488 (3) 0.0324 (3) 0.18 -0.1820 (3) 0.3628 (3) 0.1089 (3) 0.10 -0.3535 (3) 0.4659 (3) -0.0016 (3) 0.29 0.3694 (9) 0.1500 (8) 0.2690 (8) 0.93 0.5598 (8) -0.0968 (8) 0.1330 (7) 0.55 0.4747 (8) 0.1018 (8) 0.0745 (8) 0.84 0.3469 (8…
Fluorescent and Raman scattering by molecules embedded in dielectric particles is strongly dependent on the morphology and optical properties of the particle, the distribution of active molecules within the particle, and, in the case of nonspherical particles, orientation. The model previously applied to spheres and c…