Materials Literature
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Abstract L'étude du contraste a été effectuée en prenant comme modèle le mécanisme de décomposition spinoïdale prévu par Cahn [1 à 3] pour un alliage binaire cubique, dont l'énergie élastique est minimum suivant une direction β parallèle à <100>. Les contrastes effectivement observés au microscope électronique s…
Abstract The decomposition of cellulose, in the absence and presence of additives, has been studied in a combined DTA‐TGA (differential thermal analysis — thermogravimetric analysis) system, in which both determinations were carried out simultaneously and on the same sample. The overall process was found to be endothe…
Simultaneous measurements of the recovery of stored energy and electrical resistivity were performed in a differential heat flux calorimeter after neutron irradiation at 4.6 °K (linear rising of temperature from 6 °K to 250 °K, with variable velocity between 0.3°K/min - 2°K/min). At each main recovery stage the heatin…
Silver decamolybdate, Ag6MO10O33, has a layer structure where infinite sheets of edge and cornershared MoO6 octahedra are held together by silver ions.
Beautiful green pyromorphite and yellow mimetite crystals were found from the Otaru-Matsukura barite mine, Hokkaido. The physical and chemical properties of these minerals were investigated. Pyromorphite, mimetite and intermediate solid solutions were synthetized, and their physical properties were compared with those…
Because does not absorb at wavelengths longer than about 2000Aå, the rare earth phosphates, , where Ln is any rare earth (other than La, Pm, or Lu), represent an ideal system for the study of rare earth absorption. Reflectance spectra of all compounds are presented for wavelengths between 2000 and 8000Aå. Only and pro…
The eflect of porosity on the thermal conductivity of sintered ThO2 of densities ranging from 90 to 95% of theoretical density was investigated at 20°C. The thermal conductivity was determined by means of laser pulse. Discrepancies were observed between the experimental results and the relation derived by Loeb. This d…
The remanent magnetic properties of single-domain grains under uniaxial compression are easily interpreted by a graphical method based on the Néel thermal fluctuation theory, provided the stress σ and the magnetic field H are parallel. The change in remanence resulting from a change in magnetic field, stress, or tempe…
Cylindrical single crystals of nickel were prepared and their thermal expansion and Young’s modulus were measured over the temperature range of 0°∼500°C by a dilatometer and by means of an electrostatic type vibrator-controlled oscillator system, respectively. Then, from the measured values, the elastic parameters Sij…
The relative energies of the d-orbitals in tetragonal copper(II) complexes with ammonia and ethylenediamine are discussed in terms of a simple empirical theory. The d-orbital splitting is considered to arise from both σ-antibonding and electrostatic effects. The former is calculated from angular overlap considerations…
Abstract Sarverogenin is most probably a 3β, 11β, 14β‐trihydroxy‐7, 8β‐epoxy‐12‐oxo‐5β‐card‐(20:22)‐enolide ( 3 ). This follows from IR., NMR., and mass spectra together with former chemical results.
Titanium alloys stress corrosion cracking /SCC/ from metallurgical-mechanical viewpoint, discussing phase transformations, dislocation arrangements, crack propagation, etc
Abstract
A new choice of unit layer proposed by Sadanaga & Takeda (1968) has been found useful for explaining the two characteristic features of the X-ray diffraction pattern of the mica, namely, the periodic intensity distribution and the partial enhancement of symmetry. The recognition of the fact that the symmetry of the ne…
Cotton cellulose has been subjected to swelling and stretching treatments under various conditions. It has been found that the cellulose I lattice is highly resistant to alkali attack and difficult to disrupt completely during a single swelling treatment. The residual cellulose 1 “nuclei” grow upon stretching the swol…
Tensile tests on a Mg–0·8% Al alloy have been conducted at a strain rate of 10−2h−1 between 25 and 400° C with grain sizes ranging from 0·009 to 0·300 in. It is shown that the growth of voids occurs by a grain-boundary sliding mechanism and the variation of ductility in the intergranular-failure range is interpreted b…
Oxidation of mixtures of a p-phenylenediamine and a m-phenylenediamine is shown to give aminoindamine dyes by a reaction between the p-benzoquinonedi-imine and the m-diamine. At pH > 7 the latter reaction involves electrophilic attack by the conjugate acid of the di-imine on the electron-rich carbon [C(4)] of the m-di…
The unsensitized thermal decomposition of the vapour of diallyl oxalate has been studied in a fused quartz cell between 130 and 190°C. The products are consistent with the formation of allyl radicals in the primary dissociation: (COOC3H5)2→ 2CO2+ 2C3H5·; k1= 1014 ± 1 exp(–40 ± 3) 103/RT sec–1 This system is well suite…
The preparation of a number of novel aromatic macrocycles related to porphins, but containing furan and thiophen rings in addition to pyrrole rings, is described, together with deuterium exchange studies on some of the macrocycles.
The dissolution processes involved in the formation of porous films in sulfuric acid have been studied by suddenly lowering the formation voltage and observing changes in the current flowing and the barrier layer capacitance as steady‐state conditions are re‐established. It was found that current changes always follow…