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Intermetallic Sm(Fe1−xCox)2 compounds having the cubic MgCu2-type structure absorb a small quantity of hydrogen from the atmosphere under normal conditions. A magnetic annealing of such samples leads to the induction of a gigantic magnetic uniaxial anisotropy, which is linked to the ordered distribution of hydrogen in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyimines from terephthalaldehyde and aliphatic diamines. 1. Synthesis, CP-MAS carbon-13 NMR spectra, and thermal analysisAlmeria Natansohn, Haixin Yang, and Carolyn ClarkCite this: Macromolecules 1991, 24, 20, 5489–5496Publication Date (Print):September 1, 1991Publication…
Rodlike polymers with repeat units composed of groups with high π-electron density directly on the backbone, such as linearly conjugated double bonds and aromatic heterocyclic rings, exhibit high isotropic refractive indexes and high birefringence values when oriented. Typical polyamide birefringence values for orient…
Due to its excellent electrical conductivity and high electromigration resistance, copper is widely predicted to be the interconnect metal of the future for electronic microdevices. This presentation focusses upon the synthesis of a new series of volatile liquid Cu+l complexes which are shown to be suitable for the de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFTIR study of the mechanism of the chlorine and bromine atom initiated oxidation of acetyleneG. Yarwood, N. Peng, and H. NikiCite this: J. Phys. Chem. 1991, 95, 19, 7330–7337Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published ini…
Abstract Theoretical and experimental investigations are made of magnetooptical activity (MOA) of (parity) forbidden intraconfigurational 4f–4f transitions in Er(PO 3 ) 3 rare‐earth paramagnetic phosphate glasses. The interpretation of magnetooptical spectra in frames of a theoretical scheme similar to Judd‐Offelt's t…
Simple expressions for the shear modulus G and the bulk modulus B for an amorphous metal are derived. The derivation was accomplished by using a Gaussian distribution for the nearest-neighbour distance and a two-particle interatomic potential. It is shown that the difference between G or B and their crystalline counte…
The 35 Cl NQR frequencies of A 2 PdCl 6 were studied. For A = (CH 3 ) 4 N + a clathrate [(CH 3 ) 4 N] 2 PdCl 6 · Cl 2 was found and its crystal structure was determined (Fd3 c, Z = 32, a = 2554.5 pm, R = 0.062). The clathrate [(CH 3 ) 4 N] 2 SnCl 6 · Cl 2 was prepared, too. It is isomorphous with the corresponding pal…
The crystallographic nature of a quasicrystal structure is expressed in terms of the possibility of labeling `translationally' equivalent atomic positions by a set of n integers. The corresponding position vectors are integral linear combinations of n basic ones generating a vector module M of rank n and dimension m.…
The smectic layer structure within texture lines is investigated with a (sub)micrometer optical measuring spot. The property that the SmC-cone is perpendicular to the smectic layer is used to measure the in-plane rotation angle of the local smectic layers. From the measurements and observations it is concluded that te…
In-situ magnetizers are needed to facilitate the assembly of permanent magnet machines and to remagnetize the magnets after weakening due to a fault condition. The air-core magnetizer in association with the silicon steel lamination structure of the rotor has advantages over its iron-core counterpart. This method has…
Fine Si 3 N 4 ‐SiC composite powders were synthesized in various SiC compositions to 46 vol% by nitriding combustion of silicon and carbon. The powders were composed of α‐Si 3 N 4 , β‐Si 3 N 4 , and β‐SiC. The reaction analysis suggested that the SiC formation is assisted by the high reaction heat of Si nitridation. T…
Abstract The stirring speed n influences the emulsion polymerization of butadiene, (1) by reducing the effective emulsifier concentration [E] eff available for particle nucleation and stabilization at high n , and (2) by limiting diffusion of monomer to the latex particles at low n . The large density difference betwe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProtection and polymerization of functional monomers. 16. Anionic living polymerization of 4-[(trimethylsilyl)ethynyl]styreneTakashi Ishizone, Akira Hirao, Seiichi Nakahama, Toyoji Kakuchi, Kazuaki Yokota, and Katsuyuki TsudaCite this: Macromolecules 1991, 24, 18, 5230–5231P…
From structural, thermodynamical analysis and polarization measurements, we show that the N* S*C phase transition of the homologous n = 8 of a biphenyl benzoate series appears near a N* SA S*C multicritical point. Dielectric measurements detect a relaxation process in the N* phase. The temperature dependence of the di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet oxygen generation by triplet charge-transfer complexesAlexander P. Darmanyan, James W. Arbogast, and Christopher S. FooteCite this: J. Phys. Chem. 1991, 95, 19, 7308–7312Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published…
It has been shown that output-dependent Preisach models are not limited by the congruency property of other Preisach models. The problem of the relationship between two such models is addressed: the moving model and the product model. A study of the minor hysteresis loops generated by the two models highlights the ess…
The formation of hydrogen tungsten bronzes, , prepared electrochemically from thin films of amorphous , has been thermodynamically studied. The variation of the chemical potential of the inserted species in these thin films of oxide at ambient temperature has been measured using an electrochemical method. The reductio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic polymerization of monomers containing functional groups. 3. Anionic living polymerization of N,N dialkyl-4-vinylbenzamidesTakashi Ishizone, Sumio Wakabayashi, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1991, 24, 18, 5015–5022Publication Date (Print):S…
N.D. BENBOUZID‐ROLLET, M. CONTE, J. GUEZENNEC AND D. PRIEUR. 1991. In an aerobic bulk environment sulphate‐reducing bacteria (SRB) can find suitable growth conditions on surfaces where other micro‐organisms have developed an extensive biofilm. On metal surfaces they may induce or enhance corrosion. A laboratory tubula…