Materials Literature
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The susceptibility of polycrystalline [Fe${({\mathrm{C}}_{5}{\mathrm{H}}_{5}\mathrm{N}\mathrm{O})}_{6}$]${(\mathrm{C}\mathrm{I}{\mathrm{O}}_{4})}_{2}$ is reported over the temperature interval 40 mK-4.2 K. The observed transition temperature is 700 \ifmmode\pm\else\textpm\fi{} 10 mK, and the data have been analyzed ab…
Abstract The influence of composition on the overall rate of isothermal crystallization of isotactic random propylene/1‐butene copolymers is investigated. At a constant crystallization temperature a small fraction of 1‐butene co‐units inserted along a polypropylene chain causes a drastic reduction in the overall rate…
Semiconducting WO 3 with the donor electrons trapped in oxygen vacancies shows so-called `semiconductor-metal transition' at the triclinic-monoclinic (I) phase transition temperature at about 17°C. Resistivity discontinuities as large as a factor 10 2 have been observed at the monoclinic: (II)-triclinic phase transiti…
Abstract The Raman spectrum of a single crystal of monoclinic B‐type ( C ) gadolinium sesquioxide is presented. The low temperature polarization studies allowed the unambiguous attribution of 20 among the 21 normal modes expected according to the C 2 h factor group analysis predictions.
The effect of variations in pH from 7.2 to 8.2, dissolved oxygen from 0 to 7.5 ppm, and temperature from 4 to 25 C on the corrosion of aluminum alloy 5052 in natural sea water has been measured. The range for each of these variables corresponds to that over which it is typically found in the open ocean. Effects on bot…
Laboratory observations indicate that larvae of Pecten maximus (L.) pass through three phases of swimming behaviour before metamorphosis. Trochophores and early veligers generally swim upwards and, in shallow containers, tend to accumulate at the surface. Their swimming cilia beat without interruption so swimming is c…
Currently used recursive formulas for calculating the shock response spectra are based on an impulse invariant digital simulation of a single degree of freedom system. This simulation can result in significant errors when the natural frequencies are greater than 1/6 the sample rate. It is shown that a ramp invariant s…
A further step on the road to utilization of solar energy by cleavage of water is made possible by a new catalyst which promotes both H 2 ‐and O 2 ‐formation in the (known) Ru(bpy) /methylviologen system. The catalyst consists of RuO 2 (0.1%) in (Nb‐doped) n‐TiO 2 charged with finely divided Pt. The rate of generation…
Abstract The aqueous solution properties of alkylene oxide polymers and copolymers are related to their interaction with water. In an attempt to better understand this behavior, differential scanning calorimetry has been employed to measure phase changes and water binding in solutions of polyethylene glycol (PEG), pol…
The group-IV transition-metal penta-chalcogenide, ZrTe 5 , shows a giant peak of the electrical resistivity around 150 K, suggestive of a structural phase transition.
A model, describing losses in ferroelectric ceramics by the damped motion of 90° domain walls has been developed. The dependence of the complex dielectric, elastic and piezoelectric constants on the material properties P0 and S0 (spontaneous polarization and deformation), on the wall properties and on the directional…
Sustained photogeneration of hydrogen was observed on metal~free as well as on platinized SrTi0 3 single crystals illuminated in aqueous alkaline electrolytes or in the presenee of electrolyte films.Hydrogen evolution rates increased with eleetrolyte hydroxide concentration) most strongly at hydroxide concentrations a…
Abstract Allophane samples from soils, pumice, and stream beds have been studied by electron optical, infrared absorption, X-ray fluorescence, gas chromatography, and phosphate adsorption methods. The allophane particles were hollow spherules or polyhedra 35 and 50 Å in diameter with molar Al/Si ratios close to 2.0. T…
The sintering behavior of binary ZnO ceramics (containing 0.01–1 mol% of added Bi2O3) showed that densification in the initial stage of sintering and grain growth of the ZnO matrix are enhanced in the presence of a liquid Bi2O3 phase. Exaggerated grain growth of ZnO was observed above 1100 °C and in mixtures containin…
At normal temperatures and pressures water is known to have a strong influence on the strength of ceramics and glasses. Behaving as a stress corrosion agent, water causes these materials to fail prematurely as a consequence of subcritical crack growth. A basic premise of this paper is that stress corrosion cracking of…
Abstract Current theories on the origin of high electrical conductivity in TCNQ-based materials emphasize the need for incomplete charge transfer as well as segregated stacks of donor and acceptor molecules and uniform spacing within the stacks. The requirements for an “organic metal” are discussed in terms of partial…
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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