Materials Literature
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An apparatus is described for the measurement of the frequencies of resonance of longitudinal and torsional vibrations of circular cylindrical rods at temperatures in the range -180 to +195° C. The values obtained have been used to determine the elastic moduli of single crystals of tin over this range of temperature.…
Abstract The differences in thermal decomposition behavior previously observed between linear and branched polyethylenes have been explored experimentally by investigating and comparing the rates of volatilization of a series of twenty polymers. Similar differences were observed between linear and branched polypropyle…
The literature on the mineralogy and petrology of the scapolite family is reviewed. The general formula was examined in the light of 126 analyses from the literature, together with 9 new analyses. Of these 135 analyses, refractive indices were available for 64. Sixty-four of the analyses were rejected as unsatisfactor…
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Single crystals of PbTe have been heat-treated in evacuated silica tubes in the presence of Pb- or Te-rich ingots. At the heat-treatment temperatures, which ranged between 404° and 885°C, the ingot compositions were such that solid PbTe, liquid, and vapor phases coexisted. At a given temperature, the PbTe crystals wer…
Large area single crystals of Cu2O were grown by the process of high temperature annealing. Cu2O was prepared in finely polycrystalline form by the complete oxidation of Cu plate in air at temperatures of 1020°C to 1050°C. Subsequent annealing of the polycrystalline plates at higher temperatures allowed secondary recr…
Abstract Several polyamides crystallize from dilute glycerin solution as single crystals and spherulites possessing a lamellar structure. The crystal of nylon 6 are rhombohedral and thicken by spiral growth of lamellae from screw dislocations. Electron diffraction patterns indicate that the molecules are folded within…
Evaporated gold films in the 500–15 000 A thickness range were prepared on rocksalt substrates. Depending on the temperature of the substrate during deposition, the films were completely, partially, or randomly oriented with respect to the (100) plane of the rocksalt, as determined by x-ray diffraction. The stress-str…
A modification of an etch discovered by Lovell and Wernick has been shown to be a reliable means of revealing dislocations as etch pits on (111) faces of copper crystals. The etch has been employed to study dislocation distributions in as-grown, annealed, and deformed crystals. A high-temperature anneal is found to lo…
Abstract Dilatometers were used to measure the volume‐temperature curves of seven poly(4‐methyl‐1‐pentene) (PMP) samples between −30 and +270°C., and to measure crystallization rates on one sample between 220 and 236°C. A glass transition temperature of 18–29°C. was found, and the crystalline melting point was found t…
A cylindrical electrostatic electron selector is described which provides a 10 −7 ampere beam of electrons whose energy may be varied from 0 to 50 ev and whose energy spread is less than 100 mv. Space-charge problems involved in the construction of the device were overcome by the use of grids for focusing electrodes w…
Research Article| June 01 1960 The formation of fibrils from collagen solutions. 3. Effect of chondroitin sulphate and some other naturally occurring polyanions on the rate of formation G. C. Wood G. C. Wood 1Nuffield Gerontological Research Unit, Department of Medicine, University of Leeds Search for other works by t…
Single crystals of a number of binary iron-base alloys were grown, fabricated, and tested for magnetic anisotropy (K1) and magnetostriction (λ100 and λ111). The additions made to iron included vanadium, molybdenum, germanium, chromium, titanium, and tin. The anisotropy of iron was lowered by the addition elements with…
The infrared absorption spectra of boron oxide glasses of low and high water content have been obtained in the 400‐ to 4000‐cm. −1 region using thin films or fine powders dispersed in a liquid. A structural interpretation of the glass spectra has been made with the aid of the spectra of the closely related materials b…
An investigation into the thermoelectric properties of semiconductor materials to uncover the feasibility of power-generating efficiencies at temperatures from 25 to 700 C. Discussion is centered on general considerations of efficiency factors leading to materials selection and some preliminary results in the evaluati…
During the period 1933-1936 the writer was engaged in research on the physical properties of clays at the Technical University of Vienna, Austria, under the general direction of Professor K. Terzaghi. The results of this research were published as a thesis in 1937, and abstracts thereof were published as conference pa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic Investigations of Spin-free Cobaltous Complexes. III. On the Existence of Planar ComplexesF. Albert Cotton and Richard H. HolmCite this: J. Am. Chem. Soc. 1960, 82, 12, 2979–2983Publication Date (Print):June 1, 1960Publication History Published online1 May 2002Publi…
The threshold for displacement of the sulfur atom from a lattice point in CdS has been measured to be 8.7 ev. This is accomplished with 115-kev electrons. This is also the threshold for the production of green edge emission centers and of centers for a red fluorescence band with a maximum intensity at about 7200 A. In…
Research Article| June 01 1960 The formation of fibrils from collagen solutions. 2. A mechanism for collagen-fibril formation G. C. Wood G. C. Wood 1Nuffield Gerontological Research Unit, Department of Medicine, University of Leeds Search for other works by this author on: This Site PubMed Google Scholar Biochem J (19…