Materials Literature
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The susceptibility of both commercial and experimental ferritic stainless steels to intergranular corrosion was investigated. It was found that heating to 1700° F or higher and cooling rapidly sensitized a wide variety of ferritic steels to intergranular corrosion. The effects of Mo, Ni, Cb, and Ti additions to the st…
I. THE CHILING TEMPERATURE CONCEPT A. Thermodynamic Approach The Gibbs free energy of a system at temperature T is defined as were H is the enthalpy and S the entropy of the system. The free energy change for any polymerization will be, therefore, When the polymer has a lower free energy than the initial monomer, a po…
Abstract “Anhydrous manganic acetic” is a linear polymer with the empirical formula [Mn 3 O(OAc) 6 · AcOH · OAc] n . The three manganese atoms in the monomeric unit are mutually connected by three pairs of acetate bridges and form an equilateral triangle with an oxygen atom in its centre. Acetic acid molecules and ace…
preoccupation with histological detail. It is with the object of re-instating the approaches of botanists concerned with overall aspects of growth and our own studies have been undertaken.
The ordered alloy Ni2Cr has been investigated by means of electron diffraction, electron microscopy, calorimetry, resistometry and tensile tests. The formation of the Pt2Mo type superstructure is revealed by an electron diffraction study on the single crystalline specimens. The size of ordered domains is of the order…
The thermal conductivity of sintered semiconductor alloys is calculated using the Klemens-Callaway model assuming that the boundary scattering can be adequately described by a mean free path. It is shown that the relative increase in thermal resistance increases with the amount of alloy disorder scattering and should…
Abstract New measurements of magnetic properties of pure FeCr 2 S 4 and CoCr 2 S 4 have been carried out. The g ‐factors of cobalt, iron, and chromium in these compounds were evaluated. Exchange interactions were deduced from computation of the experimental paramagnetic and magnetization curves.
Abstract The oxidation of γ‐MnOOH (manganite) in oxygen and its disproportionation in HNO 3 lead topotactically to β‐MnO 2 . The oxidation of synthetic α‐MnOOH (groutite) in oxygen depends on its cristallite size; finely divided crystals oxidise rapidly to Mn 5 O 8 which usually is stable but yields β‐MnO 2 by further…
Growth of hillocks has been observed during annealing of sputtered Au films. The height of a hillock is proportional to the area it occupies in the film. This empirical relationship has been used in a model which postulates that hillock growth is associated with stress relief in the Au. The model is able to relate the…
Abstract The phase relations, crystal structures, and magnetic properties of intermetallic compounds occurring in the Er–Fe system have been investigated. A phase diagram is given. The lattice constants of the compounds ErFe 2 , ErFe 3 , Er 6 Fe 23 , and Er 2 Fe 17 have been determined. These compounds are ferrimagnet…
Use of reflected polarized light and crossed nicols in microscopic observation of the polished crosssection of the rust makes it possible to distinguish optically active layer (FeOOH) and optically isotropic one in the rust. In the atmospheric corrosion resisting steel, the metal surface is almost completely covered w…
Abstract For most applications of polymer products, the modulus or stiffness, i.e. resistance to deformation under load, is of prime importance. The mechanical losses or damping reveal molecular movements of small groups of atoms, which movements can be significant for the impact strength. This review illustrates the…
The behaviour of thin polymer films charged by a negative corona discharge in air can be described quantitatively in terms of diffusional migration and trapping of extrinsic charge carriers injected into the material. Up to a field strength of about 105 V cm–1 charge migration is characterized by a field-independent m…
Abstract An investigation of the kinetics of the emulsion polymerization of vinyl chloride has been performed. The effect on the rate of reaction of such variables as concentration of initiator (K 2 S 2 O 8 ), amount and type of emulsifier and number of latex particles has been investigated at 50°C. The order of react…
Dislocation channels cleared of radiation-produced defect clusters were observed by transmission electron microscopy in polycrystalline niobium irradiated to 4×1018 neutrons/cm2 (E>1 MeV) and then deformed in tension to 6.6% strain. From electron diffraction patterns and diffraction contrast (g·b) analysis, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOctachlorodimolybdate(II) ion. Species with a quadruple metal-metal bondJurij V. Brencic and F. Albert CottonCite this: Inorg. Chem. 1969, 8, 1, 7–10Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Published inissue 1 January 1969https://…
This paper describes the dissociation of water vapor in high‐temperature, solid oxide electrolyte cells. The characteristics of these cells are related to a composition‐dependent open‐circuit voltage, which can be obtained from thermodynamic considerations, to ohmic resistance, and to mass transport overvoltages. The…
Procedures for the growth and doping of calcite crystals in gel systems are described. Crystals surrounded by gel tend to incorporate the silica network with its structure intact. Hybrid methods avoid this contamination. Crystals then grow in small volumes of solution, the solution being replenished by diffusion throu…
Ferroelectric compounds in the family have been prepared as ceramics and single crystals. The solid solution limit increases with ionic radius: exceeds 2 for La 3+ and Pr 3+ and approaches zero for the smaller Yb 3+ and Lu 3+ ions. The larger rare earth ions also stabilize the paraelectric phase. The dielectric proper…
Abstract The results of static magnetic susceptibility measurements in the 1.8–300°K temperature range are reported on powder samples of the stable aromatic free radicals: 2,6-di-t-butyl-4(3,5-di-t-butyl-4-oxocyclohexa-2,5-dienylidene methyl) phenoxyl (Galvinoxyl) and 2,6-di-t-butyl-4(3,5-di-t-butyl-4-oxocyclohexa-2,5…