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Biotite micas from igneous rocks differ from one another mainly in their contents of SiO <sub>2</sub> , Al <sub>2</sub> O <sub>3</sub> , MgO, total Fe as FeO and, to a less extent, in TiO <sub>2</sub> . The variation in amount of each of these oxides was investigated. It was found that some depend on the nature of min…
In order to elucidate further the concept of relaxation of shear stress across grain boundaries in metals, the temperature dependence of internal friction and rigidity modulus of 99.991 percent aluminum have been measured as a function of frequency of torsional vibration and as a function of grain size of the specimen…
Abstract The system aluminium-manganese-zinc has been examined in the range 0 to 95 % of zinc, and 0 to 3 % of manganese. Attention was directed only to the constitution of the alloys above the solidus. Using micrographic and X-ray methods, and the chemical analysis of crystals separated from slowly cooled alloys, it…
Abstract The effect on X-ray reflexion of deviations of the atoms from the ideal lattice sites caused by the presence of randomly distributed foreign atoms in a dilute solid solution is investigated quantitatively. The form of the function used to describe these deviations is suggested by the distortions produced in a…
The dielectric constant and loss of barium titanate and barium-strontium titanate have been measured at biasing field strengths from 0 to 5 megavolts per meter, at temperatures from -50\ifmmode^\circ\else\textdegree\fi{}C to +135\ifmmode^\circ\else\textdegree\fi{}C and at frequencies from 0.1 to 25 megacycles. The mea…
All alloys of the type of $\ensuremath{\beta}$-brass decrease their concentration range in the disordered state as the temperature is lowered. The original theory of Jones is shown to be inadequate, and the observed variation with temperature of the phase boundaries is shown to follow directly from the assumption that…
A reduction of the spherical aberration of strong electron lenses can be achieved by a strong lens as a virtual image former and by a transformation of the image in a real one by means of one or more weak lenses. Calculations are carried out for bell-shaped magnetic fields of the axial field distribution H(z)=H01+(z/a…
A bstract The effects on the crystal stabilization and other properties of pure zirconia were determined for additions of CaO, MgO, BeO, ThO 2 , and CeO 2 in binary and ternary combinations. Complete stabilization was attained with the following compositions (in mol. %): 10 to 20 CaO, 14 MgO, 26 CeO 2 , 10 CaO + 5 ThO…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Function of Fluxes in the Preparation of Infrared Sensitive Phosphors of the Alkaline Earth Sulfides and Selenides1,2William Primak, R. Keith Osterheld, and Roland WardCite this: J. Am. Chem. Soc. 1947, 69, 6, 1283–1287Publication Date (Print):June 1, 1947Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe System CaO-SiO2-H2O and the Hydration of the Calcium Silicates.Harold H. SteinourCite this: Chem. Rev. 1947, 40, 3, 391–460Publication Date (Print):June 1, 1947Publication History Published online1 May 2002Published inissue 1 June 1947https://pubs.acs.org/doi/10.1021/cr6…
Abstract Since the permeability of rubberlike substances to gases is related to the solubility and rate of diffusion of the gases in those materials, these individual values should be known. The permeability of a membrane was measured manometrically and the diffusivity was derived from the time lag of the permeation.…
An interference filter of the reflection type consists in its simplest form of a perfectly reflecting mirror on which is placed a thin layer of a dielectric material. The outer surface of the dielectric is coated with a very thin metallic film. When properly constructed such a filter reflects 100 percent of radiation…
A theory of oriented crystallization in elongated polymers having network structures (e.g., in vulcanized rubber) is developed through the application of statistical mechanical procedures similar to those employed in rubber elasticity theory. Expressions are derived which, within the limitation imposed by the simplify…
Abstract A survey (is presented) of the work of the Corrosion Research Section of Chemical Research Laboratory (Department of Scientific and Industrial Research), Teddington, since 1939. The topics discussed include the “high‐speed rotor apparatus” for accelerated immersed corrosion tests; the investigation of high‐du…
It cannot be denied that our elementary discussions of the principal phenomena connected with surface tension and capillarity are often vague and unsatisfying. The simple statics of the systems dealt with are frequently obscured and circumvented by the introduction of the concept of free surface energy to replace surf…
Abstract Following an historical introduction, a short survey is given of the chemical properties of trimethylamine oxide. The results of determinations of the content of trimethylamine oxide in Norwegian marine products, as well as results of investigations of the fate of trimethylamine oxide during bacterial decompo…
One factor influencing the suitabilty of fabrics for clothing is resistance to the passage of water vapor. Measurement of the low resistances of woven fabrics requires a different technique from that for the high resistances of waterproofing and packaging materials, since the resistances are close to that of air itsel…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Richard A. Ogg; The Mechanism of Nitrogen Pentoxide Decomposition. J. Chem. Phys. 1 May 1947; 15…
Abstract Es wurden die folgenden Spinelle zum Teil erstmalig hergestellt und auf ihre Struktur hin untersucht: MgV 2 O 4 , ZnV 2 O 4 , Mg 2 VO 4 , 3ZnO · 4VO 2 , MgCr 2 O 4 , ZnCr 2 O 2 , MgRh 2 O 2 , ZnRh 2 O 4 und CdGa 2 O 4 . Von diesen Spinellen besitzen nur die beiden Vanadin(1V)‐Spinelle Mg 2 VO 4 und 3ZnO·4VO 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Structure of Sodium BorohydrideA. M. SoldateCite this: J. Am. Chem. Soc. 1947, 69, 5, 987–988Publication Date (Print):May 1, 1947Publication History Published online1 May 2002Published inissue 1 May 1947https://pubs.acs.org/doi/10.1021/ja01197a002https://doi.org/10.1…