Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThin Oxide Films on Aluminum.Earl A. Gulbransen and W. S. WysongCite this: J. Phys. Chem. 1947, 51, 5, 1087–1103Publication Date (Print):May 1, 1947Publication History Published online1 May 2002Published inissue 1 May 1947https://doi.org/10.1021/j150455a004RIGHTS & PERMISSIO…
In this paper, effort is directed toward explaining various diverse luminescent properties of solids in terms of a simple model of potential energy versus configuration coordinate. Three states of different multiplicities—a normal, metastable and an emitting state—are involved. The luminescent process consists of the…
Abstract A theory is given of the break-up of the metal case of a cylindrical ring-bomb, in which the lines of fracture perpendicular to the axis of the bomb are predetermined. From the theory an expression is given for the length of the average fragment; this is shown to depend, if certain hypotheses are made, on the…
The structure of the electronic energy bands and Brillouin zones for graphite is developed using the "tight binding" approximation. Graphite is found to be a semi-conductor with zero activation energy, i.e., there are no free electrons at zero temperature, but they are created at higher temperatures by excitation to a…
Abstract Barium titanium oxide, which is tetragonal at room temperature, changes about 120° C to a cubic structure. This change has been followed in detail by means of X-ray powder photographs taken in a 19 cm. powder camera at intervals of a few degrees over a range covering the transition point. The unit cell, whic…
The mechanical behavior of grain boundaries in metals has been a subject of constant controversy. The present research is designed to examine thoroughly the mechanical behavior of grain boundaries in metals in a quantitative manner. A simple torsional apparatus has been devised for measuring four types of anelastic ef…
A bstract The surface tension of a number of optical glasses made at the National Bureau of Standards was measured by a modification of the anchor ring method. The values for the flint glasses at 1300 °6, were in the range 210 to 230 dynes per cm., the barium crowns ranged from 260 to 310, while the other types of gla…
Abstract Durch die Überlegungen in Kap. 1 wird zunächst festgestellt, daß die Coulombsche Abstoßung das Verhalten des "Fermi-Gases" der Leitungselektronen im Metall entscheidend beeinflußt. Zwar spielt diese Abstoßung keine allzu wichtige Rolle für die Elektronen, deren Energie kleiner ist als die Grenzenergie des Fer…
A bstract The results on barium‐strontium titanates are given for heat‐treatment, absorption, shrinkage, thermal expansion, dielectric constant, K , at minus 60° to 85°C. and also for Q (the reciprocal of the power factor) at 25°C. for frequencies of 50 kc. per sec. to 20 mc. per sec. A few measurements of K and Q wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and X-Ray Diffraction Studies of a New Cobalt Carbide1L. J. E. Hofer and W. C. PeeblesCite this: J. Am. Chem. Soc. 1947, 69, 4, 893–899Publication Date (Print):April 1, 1947Publication History Published online1 May 2002Published inissue 1 April 1947https://pubs.a…
Abstract The viscoelastic properties of plasticized Vinylite VYNW were studied over a wide range of time scale by means of the tensile creep test. A number of different plasticizers were compared as to their plasticizing effectiveness. It was found that different plasticizers imparted distinctly different shapes to th…
Abstract The behaviour of complex materials under stress is described in terms of entities which are not strictly ‘physical properties’. These so-called ‘quasi-properties’ range from entities hardly distinguishable from dimensionally true physical properties to concepts which are much less clearly defined. Quasi-prope…
Abstract Detailed interpretations of the X -ray diffraction patterns of fibres and sheets of 66 and 6.10 polyamides (polyhexam ethylene adipamide and sebacamide respectively) are proposed. The crystal structures of the two substances are completely analogous. Fibres of these two polyam ides usually contain two differe…
Abstract Early in the investigation of butadiene-styrene copolymers as synthetic rubbers, this laboratory became interested in copolymers containing much more styrene than any of the American or German synthetics. This interest was soon directed to the resinous copolymers obtained when the styrene content is increased…
X-ray and microscope investigations of numerous specimens of so-called klaprothite from copper-bismuth ores of the type locality Schapbach valley, Baden, Germany and other localities, show that the specimens are actually wittichenite and emplecite and other known minerals.
The theory of the scattering of x-rays at small angles is given for a continuous distribution in size of randomly spaced and oriented spheroidal particles having arbitrary, but fixed, shape. Families of scattering curves are presented for spheres, and for spheroids ranging in shape from flat disks to long rods. Both M…