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Abstract The changes that are observed under magnification when a single polyvinyl chloride particle is immersed in a drop of diluent and slowly heated have been explained on the basis of a three‐dimensional network system in which the polymer crystallites act as junction points for the network. The existence of a tem…
Using the technique of zone melting by electron bombardment, $\frac{3}{8}$-in. diameter single crystals of vanadium were grown in a high vacuum. Two crystals were prepared from seeds such that their lengths were parallel to the [100] and the [110] crystal directions. With these orientations, the elastic moduli ${C}_{1…
Abstract By means of the method of electron paramagnetic resonance a demonstration is given of the occurrence of macroradicals during the degradation of glassy polymers whether of organic (polystyrene, polyethylene, polymethyl methacrylate) or of inorganic (quartz) nature.
The thermal expansion characteristics of polycrystalline delta (face-centered-cubic) zirconium hydride and epsilon (body-centered-tetragonal) zirconium hydride were determined between room temperature and 362°C and 300°C, respectively, by means of x-ray diffraction techniques. The average linear thermal expansion coef…
A phase diagram is proposed for the system UO 2 ‐ZrO 2 on the basis of earlier work and the results of new studies in which the mixed oxides were melted in a solar furnace to avoid contamination. X‐ray diffraction measurements were made on specimens melted in helium and on the same specimens after heating to 1350°C. i…
The phase transitions in PbNb 2 O 6 and in compositions of the type Pb 1+x (B x Nb 1‐x )O 6 , where B = Ti 4+ , Zr 4+ , or Sn 4+ , have been investigated between 25° and 650°C. using X‐ray and dilatometric techniques. The modified PbNb 2 o 6 compositions possess orthorhombic PbNb 2 O 6 ‐type structure, with the additi…
An apparatus is described for the direct measurement of torque-twist relationships for single wool fibers. Calculation of the rigidity of a dry fiber (0% relative humidity) agrees with results obtained by Speakman, who used a torsion pendulum technique. However, this latter technique is shown to give an underestimatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHYDROGEN SORPTION ON GRAPHITE AT ELEVATED TEMPERATURES1,2J. P. Redmond and P. L. Walker Jr.Cite this: J. Phys. Chem. 1960, 64, 9, 1093–1099Publication Date (Print):September 1, 1960Publication History Published online1 May 2002Published inissue 1 September 1960https://pubs.a…
Summary Vaterite, the third unstable polymorph of CaCO 3 , is recognized by optical and X-ray powder techniques as a major constituent in a carbonated calcium silicate hydrogel complex formed from larnite at Ballycraigy, Lame, Northern Ireland. Re-indexed X-ray powder data obtained on synthetic vaterite are provided i…
During the course of an experimental investigation on the effect of cyclic plastic strain on metals [1], it was observed that under certain conditions materials subjected to cyclic plastic strain showed little stability to simultaneously imposed steady stresses. The present paper describes and interprets some experime…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColorimetric Determination of 3,6-Anhydrogalactose and Galactose in Marine Algal PolysaccharidesWilfred. YapheCite this: Anal. Chem. 1960, 32, 10, 1327–1330Publication Date (Print):September 1, 1960Publication History Published online1 May 2002Published inissue 1 September 1…
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…