Materials Literature
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Diffusion processes during the oxidation of alloys involving noble metals are analyzed theoretically. An oxide film of uniform thickness is stable only if diffusion in the alloy is relatively rapid compared with diffusion in the oxide of the less noble metal. Otherwise, there is the tendency to form a rugged alloy‐oxi…
A dynamic method has been developed for the study of the pyroelectric effect. Transient currents produced in single crystals of barium titanate when subjected to flashes of light are shown to be pyroelectric in origin. The illumination results in a small change in the temperature of the crystal which, in turn, causes…
Abstract not Available.
Two basic equations are derived for deducing the dislocation density in powdered materials from the particle size and strain breadth measured from the Debye-Schemer spectrum. In the particle size estimate, it is assumed that the material has a block structure similar to that found in microbeam studies and that the dis…
The field emission microscope has been applied to a study of the allotropic transformation in single microcrystals of titanium. Patterns with symmetry characteristic of the high and low temperature phases are presented. Techniques for analyzing the patterns are outlined. Data derived from the pattern analyses give an…
The microwave properties of two types of manganese ferrite single crystals have been investigated by means of the ferromagnetic resonance phenomenon from 300\ifmmode^\circ\else\textdegree\fi{}K to 4.2\ifmmode^\circ\else\textdegree\fi{}K and at 24 000, 9100, 5600, and 2800 Mc/sec. The low resistivity of one of the crys…
The surface optical properties of the metals Ag, Au, Cu, Pt, Ir, and Ni in the infrared are shown to obey a simple generalized form of the Drude formula for the free electron theory, but involving two types of free electrons. If the surface optical constants are not anomalous, this procedure may be interpreted as a so…
Hall coefficient and conductivity of single-crystal InSb have been measured from 1.3\ifmmode^\circ\else\textdegree\fi{}K to 700\ifmmode^\circ\else\textdegree\fi{}K. Impurity band conduction and an acceptor ionization energy of 7\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}3}$ ev have been observed in $p$-typ…
Received 22 September 1955DOI:https://doi.org/10.1103/PhysRev.100.1788©1955 American Physical Society
Abstract By changing the temperature of deformation, during tensile experiments on single crystals of aluminium , it has proved possible to separate reversible changes of flow stress with temperature from irreversible ones. Below 130° K the reversible change of flow stress is large; above room temperature it is hardly…
A great deal of work has been done in recent years to determine how the attenuation of an x-ray beam is modified by the contribution of radiation scattered in the absorber. This scattering contribution depends on the irradiated area and on the solid angle subtended by the detector at the absorbers. The limiting case o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Effect of Water and of Glycerol on the Decarboxylation of Oxalic AcidLouis Watts ClarkCite this: J. Am. Chem. Soc. 1955, 77, 23, 6191–6192Publication Date (Print):December 1, 1955Publication History Published online1 May 2002Published inissue 1 December 1955https://pubs.…
As part of a series of investigations on the factors influencing the development of the secondary follicle population during foetal and early post-natal life of lambs, the influence of severe restriction of the feed intake of ewes throughout pregnancy is recorded. Adverse maternal nutrition reduced the body weight and…
Evidence is presented which indicates that certain fluorescent spots observed in raw cotton under ultraviolet light are associated with the prior growth of microorganisms on the fiber. A striking and characteristic type of spot which fluoresces bright greenish- yellow was noted frequently in classers' samples from the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic Properties of Alkali Metal Fluoborates and the Fluoborate IonAubrey P. AltshullerCite this: J. Am. Chem. Soc. 1955, 77, 23, 6187–6188Publication Date (Print):December 1, 1955Publication History Published online1 May 2002Published inissue 1 December 1955https://…
Abstract Die Darstellung von reinem K 2 FeO 4 , Cs 2 FeO 4 , BaFeO 4 · aq und SrFeO 4 · aq wird beschrieben. Die thermische Zersetzung von K 2 FeO 4 im O 2 ‐Strom wird untersucht; sie führt höchstwahrscheinlich zur gleichzeitigen Bildung von K 3 FeO 4 und KFeO 2 . K 2 FeO 4 reagiert mit der berechneten Menge Na 2 O un…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOligosaccharides from Partial Acid Hydrolysis of Corn Fiber Hemicellulose1,2Roy L. Whistler and W. M. CorbettCite this: J. Am. Chem. Soc. 1955, 77, 23, 6328–6330Publication Date (Print):December 1, 1955Publication History Published online1 May 2002Published inissue 1 Decembe…
Electron emission from a cathode surface produced by an applied field E is enhanced by the presence of projections on the emitter surface which cause a local increase in E. The nature of this enhancement factor μ(z), which is a function of the distance z from the cathode, is discussed more fully than hitherto and its…
Abstract The coefficient of expansion of elastomer compositions depends on the kind of polymer employed, the volume per cent of polymer plus all other organic materials, and the kind and the amount of pigment present. The specific effects of pigments in retarding the shrinkage are shown. A procedure is given by which…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat of Combustion of Samarium1Elmer J. Huber Jr., Clayton O. Matthews, and Charles E. Holley Jr.Cite this: J. Am. Chem. Soc. 1955, 77, 24, 6493–6494Publication Date (Print):December 1, 1955Publication History Published online1 May 2002Published inissue 1 December 1955ht…