Materials Literature
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Abstract Mechanical relaxation was studied in bulk polyoxymethylene by means of a torsion pendulum. The magnitude of the large γ peak at 203°K. (for f = 1.1 cycles/sec.) decreases with increasing density. The magnitudes of the β peak at 260°K, and the α peak at 400°K. do not depend on density. The β peak is small unle…
Electrical conductivity and thermoelectric power measurements have been made on nonstoichiometric UO2 at temperatures of 500–1150°C. The conductivity data in the single phase UO2+x region can be represented by the equation σ(ohm cm)−1=(3.8×106)/T(2x)(1−2x) exp[(−0.30±0.03 ev)/kT].An approximate equation for the thermo…
The wear resistance of single crystals of sapphire was determined as a function of crystallographic orientation with respect to plane of wear and rubbing direction. Distinct anisotropy was found. Evidence of plastic flow at the wear surface on both basal and prismatic slip systems was obtained. In bulk deformation tes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties and Structure of Polymers.Turner Alfrey Jr.Cite this: J. Am. Chem. Soc. 1961, 83, 19, 4111Publication Date (Print):October 1, 1961Publication History Published online1 May 2002Published inissue 1 October 1961https://pubs.acs.org/doi/10.1021/ja01480a051https://doi.…
Measurements have been made in the temperature range 750° to 1050°C. of the temperature dependence of the electromotive force of the solid‐electrolyte galvanic cells image and from these data the variation with temperature of the relative partial molar free energy of oxygen on the right side of the foregoing cells was…
Estimates of the extent of the hydrogen exchange reaction between cellulose and water vapor determined by an improved method using tritiated water and by the use of heavy water were usually in good agreement. With certain samples, surface roughness had a small effect upon the measurement of tritium radioactivity in ce…
The hydroid Sertularia operculata is abundant on boulders where the current is strong in the Lough Ine Rapids, especially on the Sill. It decreases in abundance towards positions sheltered from the current (Lilley et al. 1953), and has not been found in Codium Bay which lies just inside the lough. Codium Bay is fully…
The AlKα emission wave length is determined by the state of coordination of Al atoms and a clear distinction can be made between Al atoms in fourfold and in sixfold coordination to oxygen and also between Al atoms in fourfold coordination to oxygen and to nitrogen. Measurements of Δ(2θ) (the difference in diffraction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCOLLOIDAL ALUMINA—THE CHEMISTRY AND MORPHOLOGY OF COLLOIDAL BOEHMITEJohn BugoshCite this: J. Phys. Chem. 1961, 65, 10, 1789–1793Publication Date (Print):October 1, 1961Publication History Published online1 May 2002Published inissue 1 October 1961https://pubs.acs.org/doi/10.1…
The absorptions of natural MgAl 2 O 4 spinels which have been heated to various temperatures suggest that a structural change takes place between 800° and 900°. A decrease in the lattice constant of 0.004 Å occurs at the same temperature. Comparisons between the absorptions of LiAl 5 O 8 with ordered and disordered Li…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic Studies of High-spin Cobaltous Compounds. VII. Some Thiocyanate ComplexesF. A. Cotton, D. M. L. Goodgame, M. Goodgame, and A. SaccoCite this: J. Am. Chem. Soc. 1961, 83, 20, 4157–4161Publication Date (Print):October 1, 1961Publication History Published online1 May 2…
Experiments have been carried out on the photolysis of methyl azide and methyl-d3 azide at high dilution in solid argon (4.2°K) and carbon dioxide (∼50°K). Photolysis of these species in argon and carbon dioxide matrices results in the appearance of a number of new spectral features in the 3300–600 cm—1 region. The sp…
The structure of 4-nitroaniline has been refined three-dimensionally with visually-estimated Cu Ka data. Positional and thermal parameters for the carbon, nitrogen, and oxygen atoms, and positional parameters for the hydrogen atoms, were obtained by least squares. The standard errors in bond lengths not involving hydr…
It was found that there exists a new ferromagnetic phase in Cu poor Mn–Al–Cu alloy in the composition range of 25 to 45 at % Mn, 37.5 to 50 at % Al and 12.5 to 25 at % Cu. The crystal structure is CsCl type and the lattice parameter is 2.984Å. This structure is the same as the κ phase in Mn–Al–Fe system. The magnetic…
Examines the crystalline structure of the diamond and the chemical and industrial processes involved in its synthesis.
Abstract Some silica modification such as carplex and ground quartz particle, gives rise to the bands near 950 cm−1. This band has no relation with the skeletal structure of Si–O bond and can not be explained as overtone or combination tone. It is reasonable to assign this band to O–H deformation vibration of silanol…
The electrical conductivity σ of single crystals of cuprous oxide was measured from 25° to 1100°C and at oxygen pressures PO2 from 10—5 to 760 mm. Except at very low PO2 the σ at all T is due entirely to positive holes associated with native defects (cation vacancies). The different activation energies which occur in…
Abstract Experimental details are given for the preparation of 1,1′‐ferrocenedicarboxylic acid and 1,1′‐ferrocenedicarbonyl chloride. Ferrocenedicarbonyl chloride was used to prepare novel condensation polymers containing the ferrocene nucleus as part of the main polymer chain. Interfacial polycondensation was used fo…
Theories of several elastic effects resulting from the contribution of electrons to the strain energy function of germanium are presented. They show that the elastic properties are appreciably changed by doping with donor and acceptor impurities. The properties considered are: (1) volume, (2) elastic constants of dege…
In addition to the well‐known zinc orthotitanate (Zn 2 TiO 4 ) and zinc metatitanate (ZnTiO 3 ), the study of solid‐state reactions in the system ZnO‐TiO 2 disclosed a previously unrecognized compound, Zn 2 Ti 3 O 8 . This compound was obtained when sulfate‐containing hydrous titanium oxide of anatase structure was re…