The crystal structure of silver decamolybdate, Ag6Mo10O33
Silver decamolybdate, Ag6MO10O33, has a layer structure where infinite sheets of edge and cornershared MoO6 octahedra are held together by silver ions.
Materials Literature
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PYROMORPHITE-MIMETITE MINERALS FROM THE OTARU-MATSUKURA BARITE MINE IN HOKKAIDO, JAPAN
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…
Phosphors Based on Rare Earth Phosphates
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…
Effect of Porosity on the Thermal Conductivity of ThO2
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…
Piezomagnetization of Single-Domain Grains: A Graphical Approach
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…
Crystal Anisotropy and Temperature Dependence of Young’s Modulus in Single Crystal of Nickel
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…
Ligand field splittings in non-cubic complexes. Part I. Tetragonal copper( II )—nitrogen systems
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…
Sarverogenin, vermutliche Struktur. Glykoside und Aglykone, 314. Mitteilung
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.
METALLURGICAL ASPECTS OF THE STRESS CORROSION CRACKING OF TITANIUM ALLOYS.
Titanium alloys stress corrosion cracking /SCC/ from metallurgical-mechanical viewpoint, discussing phase transformations, dislocation arrangements, crack propagation, etc
Divalent silicon intermediates in the pyrolysis of alkoxypolysilanes
Abstract
NEW UNIT LAYERS FOR MICAS
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…
Recrystallization of the Cellulose I Lattice in Mercerized and Regenerated Cellulose Fibers
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…
The Mechanism of Void Growth and Factors Affecting the Onset of Intergranular Failure during Creep of a Mg–0·8% Al Alloy
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…
Benzoquinone imines. Part VI. Mechanism and kinetics of the reaction of p-benzoquinone di-imines with m-phenylenediamines
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…
Pyrolysis of diallyl oxalate vapour. Part 1.—Kinetics of the unsensitized decomposition
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…
18- and 22-π-Electron macrocycles containing furan, pyrrole, and thiophen rings
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.
Processes Involved in Reattainment of Steady-State Conditions for the Anodizing of Aluminum Following Formation Voltage Changes
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…
The Properties of Photochromic Materials
The types of systems available are briefly mentioned, together with the mechanisms involved in the photochromic changes. The behaviour of the materials under irradiation, both for activation (colouring) and reversal (erasure), the effect of temperature, and reversibility and resolution are discussed. The optimum perfo…
Catalytic oxidation of methane on zeolites containing rhodium, iridium, palladium and platinum
The complete oxidation of methane over zeolites containing palladium, platinum, rhodium and iridium has been studied using a microcalorimetric technique. The results show that isolated ions of these metals are able to adsorb both methane and oxygen but only with platinum do methane and oxygen adsorb competitively. The…
Fatigue Fundamentals for Composite Materials
As composites are a combination of many organic and inorganic materials already studied, we draw on this information to guide us in strength evaluations, interpretation of results, and design aspects of the new materials. Basically, many micro- and macrostructural differences exist between the materials made of metals…