Materials Literature
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An electron-paramagnetic-resonance study of rare-earth impurities in II-VI compounds has been made. Isolated trivalent rare-earth ions are found to be substitutional for the metal ion in the zinc-blende crystals. Spectra from trivalent ions both at the isolated substitutional site and incorporated in additional unknow…
A comprehensive study of the properties of "source-free" wave fields (i.e., diffracted wave fields expressible by plane-wave expansions containing only homogeneous waves) is summarized. The theorems proved in the study are stated. A new series mode expansion for "source-free" wave fields in included.
The triple-point pressure of four grades of graphite was determined to be 103 atm (absolute). The triple-point temperature varied from one grade to another with values ranging from 4183 \ifmmode\pm\else\textpm\fi{} 10 to 4299 \ifmmode\pm\else\textpm\fi{} 25\ifmmode^\circ\else\textdegree\fi{}K. The solidus-liquidus tem…
A model of hard spheres immersed in a uniform background potential, which has been successfully applied to the calculation of atomic self-diffusion in liquid metals, is shown to give a quantitative description of the velocity of sound, the compressibility, and their temperature dependences in liquid metals of widely d…
30Beyond n, use of an asymptotic formula as discussed in Ref. 23 is suggested, which is (if adapted to the present calculations) for lines involving upperand lover-state principal quantum numbers n and e' Q p ~I 8 (e) = -5 1++ y e dy+d in the quasistatie broadening, and elect~'. m impact broadening.
Three points in Fig. They are the I point in the conduction band, and the two adjacent points along the
Abstract Relationships between the mechanical properties of electrodeposited iron and the pH of the bulk of the solution were obtained for a chloride/fluoborate plating bath. Both ultimate tensile strength and percentage elongation at fracture passed through a maximum over a narrow range of pH. Structural studies usin…
Single crystals of barite grown in this laboratory by a chemically reacted flux method have been cleaved parallel to (001) and (110) planes and the cleavage faces have been studied by multiple beam interferometry. The cleavage faces were etched in HCl and H2SO4 and the etch patterns were compared with those produced o…
Measurements have been made of the thermal conductivity of iron oxide layers in the `as-formed' condition for oxide thicknesses in the range 0·027-0·48 mm over the temperature range 50-80°C. A steady-state method, involving the use of a calibrated thermopile for determining the surface temperature of the oxide, has be…
If the crystallites making up a diffractometer specimen have a number-average size , and the distribution function of crystallite sizes has a variance Wp and skewness p, the crystallite size obtained from the slope of the variance-range curve will be and that obtained from the intercept will be Even when Wp and p are…
Abstract Thermal degradation of polyisocyanates was investigated. The only degradation products were monomer and trimer. The main product was trimer for most aliphatic polymers, and monomer for aromatic polymers. Poly(cyclohexyl isocyanate) gave only its monomer on account of steric requirements. The apparent activati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of the donor properties of dimethylcyanamide and acetonitrileH. Fred Henneike Jr. and Russell S. DragoCite this: Inorg. Chem. 1968, 7, 9, 1908–1915Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Published inissue 1 September…
Abstract Chlorination of a low molecular weight polystyrene in the α position was studied by following changes in the infrared spectrum, glass transition temperature, and molecular weights of the polymer. The logarithm of the absorbance ratio at 2920 and 1500 cm −1 as a function of mole per cent chlorination was linea…
Potentiostatic anodic polarisation studies have been carried out on two carbon steels and three stainless steels in oxidising media. The resulting curves clearly defined the conditions necessary for anodic protection. Apparatus was devised whereby corrosion fatigue tests could be conducted under conditions of impresse…
Abstract The relative reactivities of α‐monosubstituted cyclic ethers having rings of three to six members toward a cation were estimated from their copolymerizations with 3,3‐bis‐(chloromethyl)oxetane (M 1 ) catalyzed by boron trifluoride etherate in methylene chloride at 0°C. It was found that the reactivity of thes…
Results of our experimental investigation on the magnetization, specific heat, and neutron diffraction in Fe-Co alloys are reported and interpreted by a statistical theory in B-W approximation. The exchange interactions between neighboring atoms in bcc are determined so that the theory reproduces the experimental magn…
The procedure for interpreting broadened diffraction maxima in terms of particle size is illustrated by means of two samples of nickel powder. The average size of the particles in submicron nickel is determined from a comparison of various measures of breadth of broadened profiles with the breadths of `standard' lines…
Measurements of the frequency dependence of the dielectric conductivity, Hall mobility, and thermal EMF as a function of temperature on polycrystalline Ni0.6Fe0.4Fe2O4indicate that these data can be interpreted in terms of the band model. Previous analyses of the semiconductor properties of ferrites according to the h…
SUMMARY Sixtytwo bacterial cultures isolated from a range of deteriorated plastic materials were tested for their ability to degrade a particular PVC mix plasticized with di‐ iso ‐octyl sebacate. Twentythree of them, mainly members of the genera Pseudomonas and Brevibacterium , gave weight losses of up to 20% in 2 wee…
Hydrogen in rutile has two influences on the electrical properties: Verneuil crystals contain hydrogen compensating the trivalent impurities. Excess hydrogen acts as an electron donor, thereby increasing the conductivity. Removal of hydrogen above 650°C in vacuum causes structural changes accompanied by enhanced condu…