Materials Literature
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The rate of cooling of fused‐silica fibers and the generation of stress in clad fibers of fused silica and 96%‐silica glass (∼125 μm OD) pulled at 1750°C were studied. Experimental cooling rates reported by previous workers were fitted using low‐ and high‐temperature heat‐transfer coefficients derived from their data.…
Abstract A number of natural kaolinites from a variety of world sources have been investigated using electron spin resonance at both X-band and Q-band. The results show systematic differences some of which are related to the crystallinity of the material, some to the presence of transition metal ions other than Fe 3+…
A method is described for quantitatively determining the inhibitory activity of pure components, isolates, or mixtures of components (such as urine) on the growth of calcium oxalate crystals. Results with known calcium phosphate crystal growth inhibitors--magnesium, citrate, and pyrophosphate--suggest that these compo…
Previously derived formalisms for extinction are extended to include crystals of non-spherical shape and anisotropy of mosaic spread and particle size. Expressions derived for extinction in an ellipsoidal crystal are compared with numerical calculations on a polyhedral specimen. A pseudo-spherical approximation for po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic investigations of excited states of transition-metal complexesGlenn A. CrosbyCite this: Acc. Chem. Res. 1975, 8, 7, 231–238Publication Date (Print):July 1, 1975Publication History Published online1 May 2002Published inissue 1 July 1975https://pubs.acs.org/doi/1…
Abstract 1. Heat treatment of carbon black-rubber mixtures is a method of “in process” polymer grafting which gives a definite improvement in the dynamic properties of vulcanizates. 2. The heat treatment process can be more effective if chemical promoters are used. These chemical promoters function as coupling agents…
The multiplet structure of core $2p$ -vacancy levels for 36 ions belonging to $3d$ transition metals have been calculated and their plots presented. Only the ground-state configuration $2{p}^{5}3{d}^{n}$ ($n=1,\dots{},9$) is considered for each ion. The spin-orbit interaction has been incorporated exactly, but the cry…
Tabulations are presented of the atomic form factor, F (α,Z), and the incoherent scattering function, S (x,Z), for values of x (=sin ϑ/2)/λ) from 0.005 Å−1 to 109 Å−1, for all elements A=1 to 100. These tables are constructed from available state-of-the-art theoretical data, including the Pirenne formulas for Z=1, con…
The anisotropic magnetoresistance effect in 3d transition metals and alloys is reviewed. This effect, found in ferromagnets, depends on the orientation of the magnetization with respect to the electric current direction in the material. At room temperature, the anisotropic resistance in alloys of Ni-Fe and Ni-Co can b…
The dc and microwave conductivities of the new organic charge-transfer salt hexamethylene-tetraselenafulvalinium tetracyanoquinodimethanide (HMTSF-TCNQ) remain metallic in magnitude to temperatures at least as low as 1.1 K. At low $T$ we observe a resistance minimum and thermoelectric anomaly consistent with the theor…
Room-temperature electrical resistivity, Hall mobility and Seebeck coefficient measurements on relatively-low-density, hot-pressed, boron-doped Ge 20 Si 80 alloys are reported as functions of 1/R H e in the range 2*10 19 -3.4*10 20 cm -3 . The temperature variations of resistivity and Seebeck coefficient are reported…
Cross sections for electron-mercury scattering at incident electron energies from 0.1 to 1.4 eV have been calculated by numerical solution of the Dirac equation including exchange and a polarization potential but not coupling to inelastic channels. A resonance has been found in the p 1/2 partial wave at about 0.2 eV w…
Using the form factor approximation and nonrelativistic Coulomb wavefunctions, cross section profiles for Compton scattering of gamma rays are calculated for all subshells of the atom. Spherical coordinate are used in order to facilitate a straightforward application of self-consistent wavefunctions. Relativistic ener…
Abstract Übersicht über Nomenklatur sowie Synthese, molekulare Schwingung und Geometrie, Elektronenstruktur und thermodynamische Eigenschaften der Chalkogenocyanat‐Ionen.
Single crystals of iron-doped Ta${\mathrm{S}}_{2}$ grown from sintered powders of composition ${\mathrm{Fe}}_{0.05}$-Ta${\mathrm{S}}_{2}$ show a rise in critical temperature to above 3 K and an enhanced anisotropy of ${H}_{c2}$ which is comparable to that observed in $2H$-Ta${\mathrm{S}}_{2}$${(\mathrm{pyridine})}_{\m…
Compression tests have been carried out on Ni-rich single crystals of Ni3(Al, Ti) with [001] and [132] compression axes over the temperature range −110 to 1000 °C. The [132] orientated crystals exhibited a peak in the flow stress at about 450 °C. Slip line and dimensional analysis revealed five different modes of defo…
In an attempt to grow crystals of ammonium acid phthalate with the aim of refining the previously reported gross structure, the diammonium salt was obtained. (NH4)2(OOC. C6H4. COO), orthorhombic, a=6.839 (14), b=13.041 (4), c=22.118 (8)A, Pcab, 0obs = 1.34 Qcalc = 1.34 g cm -3, Z = 8. The structure was solved by direc…
A theoretical model for the calculation of the one- and two-phonon Raman scattering intensities (far from resonance) for covalent crystals is presented. Starting from Placzek's theory, the crystal polarizability is expressed as a sum of individual bond contributions. Instead of the usual "electron-phonon" and "electro…
The homogeneous nucleation of crystals in normal alkane liquids has been studied using a droplet technique for a range of alkanes between C16H34 and C5H12. The critical undercooling for nucleation, ΔTN, relative to the melting point TE, increases significantly with decreasing length of the alkane chain n: ΔTN/TE incre…
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