Materials Literature
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Zinc whiskers and platelets with a (0001) orientation and thin enough (≲ 1/2 μ) to be transparent to 100 kv electrons were deformed in tension inside the electron microscope and the motion of individual dislocations followed by the transmission technique. These observations were then related to the macroscopic propert…
Oxygen self-diffusion coefficients have been determined for MgO crystals over the temperature range 1300–1750°C. Results can be represented by the equation D=2.5×10—6 exp (—62 400/RT). By comparison with data for alkali halides and previous measurements for aluminum oxide, diffusion is probably extrinsic in nature. Th…
Abstract Im System PbO—P 2 O 5 existiert zwischen Pb 4 P 2 O 9 und Pb 3 P 2 O 8 = Pb 3 (PO 4 ) 2 der inkongruent schmelzende Oxypyromorphit Pb 10 P 6 O 25 = Pb 10 (PO 4 ) 6 O. Der Oxypyromorphit kristallisiert im Apatit‐Gitter, von den Halogenlagen ist nur die Hälfte besetzt (durch O 2− ). Die Verdoppelung der c‐Konst…
Abstract As a basis for eventually evaluating the effect of charcoal, formed during forest fires, on the availability of phosphate ions in the soil, the thermodynamics of aqueous phosphate adsorption on six typical synthetic and natural charcoal materials is investigated. A standard adsorption process is defined under…
The electrical properties such as the electronic and ionic conductivities, Hall coefficients, etc. of the alloys Ag 2 (Te, Se; Te, S; Se, S) are studied with use of the galvanic cell Ag|AgI|specimen|Pt, the excess Ag content being controlled by sending a current across the cell. The electrical properties of these allo…
Presented are the results of an experimental investigation to determine the buckling strength of right circular cones under axial compression. Correlation of these data is made with existing theory and with previously published experimental data on circular cylinders; thus a recommended procedure for predicting the bu…
Since the Mo--U system was first investigated, an extensive fund of information has accumulated which is confusing because of the diversity of terminology. A meeting was held at Saclay between representatives associated with the metallurgy of uranium alloys to agree upon a nomenclature for the phases in uranium alloys…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWETTING PROPERTIES OF TETRAFLUOROETHYLENE AND HEXAFLUOROPROPYLENE COPOLYMERS1Marianne K. Bernett and W. A. ZismanCite this: J. Phys. Chem. 1960, 64, 9, 1292–1294Publication Date (Print):September 1, 1960Publication History Published online1 May 2002Published inissue 1 Septem…
The Mn4+ center in mainly octahedral symmetry has been studied in magnesium fluorogermanate phosphors. Emission and absorption spectra and the temperature dependence of various parameters have been evaluated. Absorption takes place from the 4A2 ground state into the 4F2, 4F1, and higher excited states whereas both emi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTINVESTIGATION OF COLLOIDAL HYDRATED CALCIUM SILICATES. I. SOLUBILITY PRODUCTSS. A. Greenberg, T. N. Chang, and Elaine AndersonCite this: J. Phys. Chem. 1960, 64, 9, 1151–1157Publication Date (Print):September 1, 1960Publication History Published online1 May 2002Published ini…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Oxidation of Thiocyanate Ion by Hydrogen Peroxide. I. The pH-Independent ReactionI. R. Wilson and G. M. HarrisCite this: J. Am. Chem. Soc. 1960, 82, 17, 4515–4517Publication Date (Print):September 1, 1960Publication History Published online1 May 2002Published inissue 1 S…
The authors compare the mechanical behavior of woven and nonwoven fabrics. They outline the principal mechanisms by which woven cloths deform and recover in manufacture and in end usage. They attempt to formulate a parallel sequence of events in the distortion process for nonwovens and to show how these actions influe…
Abstract The degradation of high polymers of ethylene oxide in aqueous and organic solutions is accelerated by strong acids, certain oxidizing agents, ultraviolet light, and certain heavy metal ions. The effectiveness of the latter two components is related to the solution stability of various polymer samples upon lon…
Abstract The reaction of toylene diisocyanate (80/20 mixture of 2,4 and 2,6‐isomer) with a secondary hydroxyl‐containing polyoxypropylene triol was studied in the presence of numerous compounds to test their catalytic effect on the reaction. The reaction was studied by determination of the gelation time of the reactio…
Thin insulating films, less than 100 A thick to a few thousand angstroms, were produced by bombarding a substrate with electrons in the presence of silicone oil vapor. The rate of deposition of the solid film was found to depend on the substrate temperature, electron beam current density, and oil vapor pressure. A the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHelix [UNK] Coil Transitions in Dilute Aqueous Collagen Solutions1Paul J. Flory and Edwin S. WeaverCite this: J. Am. Chem. Soc. 1960, 82, 17, 4518–4525Publication Date (Print):September 1, 1960Publication History Published online1 May 2002Published inissue 1 September 1960ht…
Wire grids have been fabricated with microscopic elements and periodicity. These wire grids behave as linear polarizers over large portions of the infrared spectrum, confirming predictions from electromagnetic theory. The method of fabrication of grids with periods as small as 463 mμ is described. Limits on the perfor…
Twin-domain walls in large crystals of antiferromagnetic NiO have been observed by specular reflection in optically polished and annealed crystals. These walls can be moved in annealed crystals by small mechanical stresses (<106 d/cm2) or by moderate magnetic fields (<25 000 oe) to yield completely untwi…
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