Materials Literature
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The effect of the substitution of Fe by Co and Al in Nd2Fe14-x-yCOxAlyB (0 \leq x \leq 2, 0\leq y\leq 1) alloys on their domain structure has been investigated. The observations of the domain structure have been carried out at room temperature by means of the magneteoptical polar Kerr effect. The domain wall energy de…
A critical assessment is given of the likely modes of thermal decomposition of RDX. Previous publications by other authors report that thermally decomposed RDX produces nitroxide and nitronylnitroxide radicals as intermediates. These results are discussed, and it is suggested that these radicals are not primary decomp…
TEM studies of Zr-containing 2:17-type permanent magnet alloys show that the cellular microstructure develops from a high temperature 2:17R phase, first by the precipitation of Sm-depleted, Zr-rich "2:17H" platelet phase, then by the precipitation of Cu-rich, Fe- and Zr-depleted "1:5" boundary phase. These results are…
The complex 1 can be regarded as a kind of “inorganic sandwich compound” without metal–metal bonds: It contains an MnII atom sandwiched between two relatively flat [MnO2] moieties. 1 is obtained in the form of black crystals on treatment of [Mn3O(O2CPh)6(py)2(H2O)] in acetonitrile with solid salicylic acid. Noteworthy…
This paper considers the heat-to-heat variability in corrosion resistance and microstructure that might be encountered in low carbon AISI 316 nuclear grade stainless steels (SSs). The results will show that although these low carbon steels are rather resistant to sensitization by chromium depletion, they vary signific…
The outgassing rates of a vacuum remelted type 316L stainless steel were measured as a function of baking temperatures, baking durations, and air exposure/baking cycles. Long-time baking, as was expected, reduced the outgassing rate of the stainless steel. A subsequent air exposure and short-time baking in vacuum was…
This paper reviews the recent developments of Fe-Cr-Co permanent magnet alloys. The Fe-Cr-Co alloys offer magnetic properties comparable to those of Alnico alloys, but with a distinct advantage of being ductile and containing less cobalt. Considerable effort has been expended in understanding the relationship between…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolylactones. 10. Cationic polymerization of .delta.-valerolactone by means of alkylating reagentsHans R. Kricheldorf, Ruth Dunsing, and Angela SerraCite this: Macromolecules 1987, 20, 9, 2050–2057Publication Date (Print):September 1, 1987Publication History Published online…
The strain rate and strain rate history effects on the inelastic stressstrain behavior of annealed A‐36 structural steel at room temperature are examined experimentally under monotonic and cyclic loading conditions. The strain rate used is between 10-6-10-1/sec, which covers the range that might be experienced by stee…
Abstract Electron spin resonance (ESR) of γ‐irradiated poly(vinyl alcohol) (PVA) at room temperature has been used to identify the radiation damage products. The ESR spectrum is analyzed by using least‐squares fits between observed and calculated spectra, assuming various free radical species. The best theoretical fit…
Abstract The Raman spectra of polycrystalline samples of the metavanadates M II V 2 O 6 (with M = Ca, Cd, Cu and Mg), belonging to the brannerite structural type, have been recorded. A general assignment, supported by comparisons with known vibrational properties of other oxovanadium species, is proposed. The compound…
We present calculations of the light intensity transmitted through a ferroelectric liquid crystal light valve with uniformly tilted layers during electrooptical switching. We discuss the switching characteristics of the light valve for different layer tilts and at different applied voltage steps. We also show that the…
Abstract All available theoretical analyses for the drainage of thin plane‐parallel liquid films, such as those existing between two approaching liquid droplets or bubbles in the coalescence process, predict essentially the same dependence of rate of thinning of the intervening film on its size as is described by the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification of intermediates and products in the reaction of porphyrin iron(III) alkyl complexes with dioxygenRamesh D. Arasasingham, Alan L. Balch, and L. Latos-GrazynskiCite this: J. Am. Chem. Soc. 1987, 109, 19, 5846–5847Publication Date (Print):September 1, 1987Public…
The phase diagram near compositions of magnet alloys, that is, Sm-Co-13.0at%Cu-10.0at%Fe, Sm-Co-7.0at%Cu-22.0at%Fe and Sm-Co-7.0at%Cu-22.0at%Fe-2.0 at%Zr sections of the phase diagram were determined in the Sm content range from 6 to 16 at%. Furthermore, relationships between phase transformation at high temperature a…
The corrosion behavior of AISI 316 stainless steel (SS) in formic and acetic acids was investigated by measuring the corrosion weight loss, the polarization curve, the impedance at the steel/solution interface, and the variation of natural electrode potential (NEP) with time. It was found that the corrosion rate of AI…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLong-distance magnetic exchange between chromium(III) atoms bridged by H3O2- ligandsMichael Ardon, Avi Bino, Kirsten Michelsen, and Erik PedersenCite this: J. Am. Chem. Soc. 1987, 109, 19, 5855–5856Publication Date (Print):September 1, 1987Publication History Published onlin…
Abstract Thin strips of pine, Pinus sylvestris , and lime, Tilia vulgaris , were acetylated with acetic anhydride to various levels of acetyl weight gains. Increase in thickness, due to the bulking effect of acetylation, and increase in equilibrium moisture content at 65% relative humidity were determined. Equilibrium…
When work is performed in heavy clothing, evaporation of sweat from the skin to the environment is limited by layers of wet clothing and air. The magnitude of decrement in evaporative cooling is a function of the clothing's resistance to permeation of water vapor. A physiological approach has been used to derive effec…
An analysis is presented for the Tammes problem: how must n points be distributed on the surface of a sphere in order that the minimum angular distance between any two of the points be a maximum? With the analogy of the capsid structure of small 'spherical' viruses, locally extremal arrangements are constructed in tet…