Materials Literature
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A figure of merit is defined for an indexing of a given pattern as M20 = Q20/2\overline \epsilonN20. Here N20 is the number of different calculated Q values up to Q20, which is the Q value for the 20th observed and indexed line; is the average discrepancy in Q for these 20 lines. From a number of indexings which have…
Broad line nuclear magnetic resonance measurements were made over a wide temperature range from 77°K. to the melting point for polytetrahydrofuran and poly–1, 3–dioxolane. The NMR spectra showed two components at room temperature, broad and narrow, and these were attributed to crystalline and disordered regions, respe…
The use of high-power magnification with large numerical aperture (N.A.) objectives in determining the thickness of transparent films requires a thickness correction due to the effective angle of incidence not being perpendicular to the substrate. The effective angle of incidence is dependent upon both the numerical a…
The Born model of ionic solids has been used to make a complete determination of alkaline earth and chalcogenide ionic radii from solid state data alone. The additivity rule of interionic distances in the NaCl structure alkaline earth chalcogenides is used to relate the first- and second-neighbour contributions to the…
Measurements of the transmission spectra of thick silicon monoxide films are reported, and from these the absorption coefficient of silicon monoxide is calculated as a function of wavelength. The results obtained are compared with the predictions of a simple theoretical model.
Vom GaOOH, GaOOD und den entsprechenden partiell deuterierten Präparaten wurden die IR-Absorptionsspektren im Bereich von 10 000 bis 33 cm -1 aufgenommen und Banden den OH-Valenz- und OH-Librationsschwingungen und Schwingungen der GaO 6 -Oktaeder zugeordnet. Die Multiplizität der OH-Banden ist im wesentlichen auf eine…
Double-zeta functions 1 are very useful because of their relative simplicity connected with good accuracy as compared with the Hartree-Fock functions 2 . These two advantages make them an obvious choice even for semiempirical type of calculations. To test the doublezeta function we have calculated one-and two-center i…
The crystal structure of the rubidium salt of an octadecahydroeicosaborate(2-) photoisomer, Rb 2 B 20 H 18 , has been determined by X-ray diffraction vnth a single crystal specimen.The orthorhombic unit cell, space group Pn2 1 a, vnth ~ = 12.334 A, £ = 19.014A, £ = 7.260 A, contains four formula units.The structur.e w…
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It was possible to drive plastically blunted cleavage cracks through double cantilever beam specimens of impure MgO monocrystals in a series of small propagations. The forces required to propagate the cracks often defined a fairly constant apparent surface energy and provided an environment‐sensitive measure of toughn…
The crystal structure of ferrites including garnets and their methods of preparation are first reviewed. This is followed by an examination of microwave ferrite devices and their application to actual systems. Sufficient theoretical details as well as an extensive though not exhaustive list of references are included…
By a general theorem connecting the steady-state electrical potential function for the region surrounding a system of long, parallel homogeneous conductors carrying steady currents to the solutions for the electrostatic potential in the given geometry, it is shown that the density of the surface charges on the conduct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent and temperature effects in the determination of pyrrolizidine alkaloids with 4-(dimethylamino)benzaldehydeJ. B. BingleyCite this: Anal. Chem. 1968, 40, 7, 1166–1167Publication Date (Print):June 1, 1968Publication History Published online1 May 2002Published inissue 1…
Permanent magnets are finding ever-increasing uses as magnet technology develops and materials improve. Permanent magnet materials are evaluated in terms of the geometry and configuration of the application for which they are intended. The origin of the properties of most modern permanent magnet materials is interpret…
Abstract The melt viscosity, the glass transition, and the effect of pressure on these are analyzed for polystyrene on the basis of the Tammann‐Hesse viscosity equation: log η = log A + B /( T − T 0 ). Evidence that the glass transition is an isoviscosity state (log η g ≃ 13) for lower molecular weight fractions ( M &…
Three clay minerals, a kaolinite, an illite and a montmorillonite, were saturated with different cations (Li + , Na + , K + , Mg ++ , Ca ++ , Sr ++ , and Ba ++ ) before equilibration with dilute phosphorus solutions. The phosphorus adsorption data conformed to the Langmuir adsorption isotherm. The relative magnitude o…
Ester cross linkages in cotton cellulose have been investigated for mobility (trans esterification) at elevated temperature. Cotton cellulose polycarboxylates were prepared by reaction of cotton print cloth with polycarboxylic acids having 3-6 carboxyl groups per molecule, at least two of the carboxyl groups being on…
Stacking faults and dislocation dissociations on {011} and {121} planes in body-centred cubic lattices are examined. The effect of stress on the threefold dissociation of screw dislocations on {121} planes is studied in detail. A change in configuration occurs on reversal of stress, as in tension and compression exper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotential functions and the bonding in the XCO free radicalsJames S. Shirk and George C. PimentelCite this: J. Am. Chem. Soc. 1968, 90, 13, 3349–3351Publication Date (Print):June 1, 1968Publication History Published online1 May 2002Published inissue 1 June 1968https://pubs.a…
The deformation microstructures associated with aluminium after shock loading and cold rolling at room temperature and at liquid nitrogen temperature are presented and discussed. A high density of point defects is produced by shock loading aluminium and it is observed that vacancy-produced dislocation loops are more n…