Materials Literature
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Measurements of the magnetoresistance coefficients at 4.2\ifmmode^\circ\else\textdegree\fi{} K and at 20.4\ifmmode^\circ\else\textdegree\fi{} K in single crystals of copper, silver, and gold in the low magnetic field range, and in single crystals of silver for high magnetic field are reported. The low-field results we…
Abstract The stabilization energy due to the conjugation taking place between a monomer and an ion in the transition state is calculated by the LCAO perturbation theory, in the same way in which the reactivity in radical copolymerization has previously been treated. In terms of this stabilization energy, the reactivit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLanthanum Rhodium and Lanthanum Cobalt OxidesAaron Wold, Benjamin Post, and Ephraim BanksCite this: J. Am. Chem. Soc. 1957, 79, 24, 6365–6366Publication Date (Print):December 1, 1957Publication History Published online1 May 2002Published inissue 1 December 1957https://pubs.a…
X-ray and density studies have been made on single crystals of quartz irradiated with fast pile neutrons at approximately 100°C. The structural effects of the irradiation follow at least two processes with doses up to 1·2 × 1020 neutrons/cm2. Crystals irradiated with less than 3 × 1019 neutrons/cm2 expand anisotropica…
The thermal comparator described consists of two metal balls similarly mounted in a block of balsa wood, but one is at a slightly lower level so that it touches any surface on which the block rests. After heating to a small fixed temperature excess the block is laid in contact with the test surface. Differentially con…
Paramagnetic-resonance absorption has been observed in complexes of acetylacetone with the trivalent transition metals titanium, chromium, iron, molybdenum, and ruthenium. The symmetry of the field perturbing the metal ion is predominantly axial. For the complexes of Ti+3 and of Ru+3, the axial potential is negative.…
Examination of small euhedral crystals of α-Al2O3 (sapphire) that were observed following oxidation of aluminum and an aluminum alloy in wet hydrogen at high temperatures showed that growth probably occurs by decomposition of AlO on an Al2O3 surface. Rapid growth occurs on the tips of needles and the edges of platelet…
Abstract An x‐ray diffraction study has been made of cellulose triacetate II. Small films of highly crystalline triacetate with good fibrous orientation and a fair degree of biaxial orientation have been prepared by repeated rolling at successively higher temperatures between 160 and 215°C. The x‐ray diffraction patte…
Abstract A general criterion for gelation in polycondensations having like groups of unequal reactivity has been formulated. In its simplest form, the criterion is that, for gelation, the expectation that a given structure will be propagated is unity, or greater. Several specific cases are treated, and literal express…
Power factor, loss factor, dielectric constant, volume resistivity, surface resistance, and dielectric strength of epoxies, varying in viscosity and reactivity and cured with several types of hardeners, have been determined and form the basis for this report. The effect of cure, temperature, and frequency on electrica…
The anisotoropy of the galvanomagnetic effects in the single crystals of pure bismuth was investigated at the temperatures between -160° and 45°C. The results were analysed by the phenomenological theory of the galvanomagnetic effects. Two components of the resistivity tensor, two components of the Hall tensor, eight…
Abstract A method is presented for the analysis of a reaction between a porous solid and a gaseous reactant where the kinetic expression is linear in the concentration and where appreciable concentration gradients are established in the pore system as a result of diffusive transport rate. Two cases are treated mathema…
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Samples of both $n$-type and $p$-type ${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$ containing from 3\ifmmode\times\else\texttimes\fi{}${10}^{17}$ to 5\ifmmode\times\else\texttimes\fi{}${10}^{19}$ extrinsic carriers were prepared and the phase diagram in the region about ${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$ has been clarif…